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Table of ContentsObjectives: ................................................................................................. 2
Why use optical fibers? .......................................................................... 2
Fundamentals of digital fiber-optic links ........................................2
Why encoding is desirable ................................................................... 2
Why so many different fiber-optic components? ........................ 2
How to use disintegrated components ........................................... 3
Parallel-to-serial and serial-to-parallel converters ....................... 3
So what happens when data is encoded? ......................................3
So what happens if data is not encoded? ...................................... 4
Avago fiber-optic solutions for unencoded data ........................ 4
Low-cost digital transmitters .............................................................. 4
Using Avago’s recommended solutions ..........................................4
Solution for dc to 40 KBd TTL data at distancesbetween 0 and 53 meters..................................................................... 5
Solution for dc to 40 KBd TTL data at distances
between 0 and 1.5 kilometers. ...........................................................6
Solution for dc to 1 MBd TTL data at distances
between 0 and 10 meters..................................................................... 7
Solution for dc to 1 MBd TTL data at distances
between 0 and 45 meters..................................................................... 8
Solution for dc to 5 MBd TTL data at distancesbetween 0 and 16 meters..................................................................... 9
Solution for dc to 5 MBd TTL data at distancesbetween 0 and 700 meters. ...............................................................10
Solution for dc to 5 MBd TTL data at distances
between 0 and 1.7 kilometers. .........................................................11
Solution for dc to 10 MBd TTL data at distances
between 0 and 40 meters...................................................................12
Solution for dc to 10 MBd TTL data at distancesbetween 0 and 300 meters. ...............................................................13
Solution for dc to 32 MBd TTL data at distancesbetween 0 and 1.3 kilometers. (Pages 14 & 15) ..........................14
Solution for dc to 32 MBd TTL data at distances
between 0 and 3.3 kilometers.(Pages 16 & 17) ...........................16
Solution for 2 to 70 MBd TTL data at distances
between 0 and 3.8 kilometers. (Pages 18 & 19) ..........................18
Solution for 20 to 160 MBd +5V ECL (PECL) data at distances
between 0 and 2 kilometers. (Pages 20-22) .................................20
Distance vs. Data rate HFBR-14X4Z and HFBR-24X6Z,PECL Transceiver with 62.5 Pm Fiber .............................................22
Distance vs. Data rate HFBR-14X4Z and HFBR-24X6Z,
TTL Transceiver with 62.5Pm Fiber ................................................22
Distance vs. Data rate HFBR-15X7Z and HFBR-25X6Z,
PECL Transceiver with 1 mm POF Fiber .........................................23
Distance vs. Data rate HFBR-15X7Z and HFBR-25X6Z, TTL Transceiver with 1 mm POF Fiber ............................................23
Distance vs. Data rate HFBR-15X7Z and HFBR-25X6Z,PECL Transceiver with 200 Pm HCS Fiber .....................................24
Distance vs. Data rate HFBR-15X7Z and HFBR-25X6Z, TTL Transceiver with 200Pm HCS Fiber ........................................24
Distance vs. Data rate HFBR-13X2TZ and HFBR-23X6TZ,
PECL Transceiver with 62.5 Pm Fiber ..............................................25
Distance vs. Data rate HFBR-13X2TZ and HFBR-23X6TZ,
TTL Transceiver with 62.5Pm Fiber ................................................25
Application Notes for Plastic and GlassOptical Fiber Components .................................................................26
Best Practices for Using Fiber-Optic Components,Common Do’s and Don’ts..................... ............................................ 27
Fiber Optic Components
CookBook
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2
Objectives:
1) Explain some fundamental characteristics of digitalfiber-optic communication links.
2) Provide proven digital fiber-optic transceiver solutions.
3) Provide Data Rate vs. Distance Graphs for Avago’sFiber-Optic Components
4) Supply references to Avago Application Notes and
Data Sheets for additional details.
Why Use Optical Fibers?
When using fiber-optic data communication links, de-signers can develop new products which provide noise
immunity that is superior to copper wire.
Optical fibers do not require rigorous grounding rules to
avoid ground loop interference, and fiber-optic cablesdo not need termination resistors to avoid reflections.
Fiber-optic links also have an intrinsically higher prob-
ability of surviving lightning strikes than copper wirealternatives.
Optical connectors suited for field termination with mini-
mal training and simple tools are now available. For ad-ditional details refer to the HFBR-4531Z/4532Z crimplessconnector data sheet, Avago publication number AV02-
0460EN.
When using plastic optical fiber (POF) or hard clad silica(HCS®) the total cost of the data communication link isroughly the same as when using copper wire.
Fundamentals of Digital Fiber-optic Links
Digital fiber-optic links are normally used to transport
serial data. When the length of the data communica-tion channel increases parallel data transfer is generallyavoided due to cost and time skew issues.
Parallel-to-serial and serial-to-parallel converters are nor-mally used to interface computers and microprocessors
to fiber-optic links.
When parallel data is serialized it is usually encoded, butnot all serial communication protocols make use of en-coding.
Some existing copper wire serial data communicationprotocols use no encoding or make use of protocols thatsend data in bursts or packets.
Encoding merges the clock and data into one serial datacommunication link. Encoding eliminates time skew,which can occur when separate communication links are
used for the clock and serial data.
Why Encoding Is Desirable
Unencoded data has dc voltage offsets because unen-coded data can remain in the “logic 0” or “logic 1” state
for indefinite intervals of time.
Encoding algorithms ensure that data is continuously
transmitted. Encoding also restricts duty cycle varia-
tions so that the average value of the encoded signal ap-proaches half of the data’s peak-to-peak amplitude.
Some encoding algorithms allow duty cycle variations
between 40% and 60%, while other encoding algorithmsprovide data with an average duty cycle of 50%.
If no encoding is used the digital fiber-optic receiverneeds to be dc coupled or must make use of edge detec-tion techniques to accommodate the dc components of
the serial data.
Burst mode or packetized data also requires use of dccoupled or unique ac coupled edge detecting receiver
circuits.
Digital fiber-optic receivers can be dc coupled or ac cou-pled, but ac coupled receivers generally provide better
sensitivity than dc coupled receivers.
A conventional ac coupled receiver will not provide satis-factory performance if the transmitted data contains dccomponents. Serial data that remains in the logic “1” or
logic “0” state for indefinite time intervals is not compat-ible with the majority of ac coupled receiver circuits.
Why So Many Different Fiber-optic Components?
To meet all of the diverse requirements of the serial datacommunication market, Avago manufactures both fully
integrated dc coupled TTL-compatible receivers and dis-integrated components that can be used to construct
high performance ac coupled receivers.
Integrated dc-coupled TTL-compatible receivers are very
convenient, but an integrated receiver cannot providethe sensitivity achievable with disintegrated receiver
components.
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3
How to Use Disintegrated Components
Disintegrated receivers are constructed using hybrid re-ceiver components that contain a PIN diode optical de-
tector and a transimpedance amplifier. The transimped-ance amplifier converts PIN diode detector current to a
voltage which is proportional to received optical power.
The PIN diode plus transimpedance amplifier hybridcomponent is commonly called a PIN pre-amp.
The PIN pre-amp can be connected directly to a compa-
rator to implement a simple, medium performance logic-compatible digital receiver.
To construct a high performance digital fiber-optic re-ceiver, the PIN pre-amp is connected to a post amplifiercomparator circuit commonly known as a quantizer.
Ideal quantizers provide excellent receiver sensitivity
limited by the shot and thermal noise of the first stage of the PIN pre-amp’s transimpedance amplifier.
High performance ac coupled receivers require that theserial data is encoded so that data will not remain in thelogic “1” or logic “0” states for indefinite time intervals.
Parallel-to-Serial and Serial-to-Parallel Converters
Many readily available off-the-shelf parallel-to-serial and
serial-to-parallel converters have integrated encodersand decoders.
Parallel-to-serial and serial-to-parallel converters arecommonly called physical layer or PHY chips.
So What Happens When Data is Encoded?
The encoder in a PHY chip replaces individual bits withsymbols, or groups of bits with groups of symbols.
Encoders commonly increase the fundamental frequen-cy that the serial communication channel must trans-
port, but duty factor variations are constrained whendata is encoded.
Figure 1 shows the relationship between bits/second,symbols/second (Baud), and the fundamental frequency
of serial data when using encoders commonly found inoff-the-shelf PHY chips.
Note that Fo is the maximum fundamental frequency of the encoded data. The minimum fundamental frequency
of the encoded data is determined by the encoder’s runlimit.
Encoding merges the clock and data into a single serialbit stream. Encoded data contains time reference infor-
mation needed by the timing recovery circuit (aka PLL)located at the receiving end of the fiber-optic link.
Figure 1. Attributes of Encoding
MANCHESTER
ENCODER
(50% EFFICIENT)
SERIAL DATA
SOURCE
32 M BITS/SEC
4B5B
ENCODER
(80% EFFICIENT)
8B10BENCODER
(80% EFFICIENT)
(27)-1
SCRAMBLER
(100% EFFICIENT)
APPROXIMATELY 50% D.F
50% D.F
40% TO 60% D.F
50% D.F 64 MBd
ENCODED DATA
f o = 32 MHz
0% TO 100% DUTY FACTOR (D.F) 32 MBd
NRZ DATA
f o = 16 MHz
40 MBd
ENCODED DATA
f o = 20 MHz
40 MBdENCODED DATA
f o = 20 MHz
32 MBd
ENCODED DATA
f o = 16 MHz
NOTE THAT f o IS THE MAXIMUM FUNDAMENTAL FREQUENCY OF THE ENCODED DATA.
THE MINIMUM FUNDAMENTAL FREQUENCY OF THE ENCODED DATA IS DETERMINED BY
THE ENCODER'S RUN LIMIT.
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4
So What Happens If Data Is Not Encoded?
If encoding is not used the time reference (clock) mustbe transmitted through a separate fiber-optic link, or the
data must be oversampled by a local oscillator located atthe receiving end of the fiber-optic link.
This local oscillator must operate at a significantly higherfrequency than the fundamental frequency of the serial
data to avoid excessive pulse width distortion. For moredetails see Application Note 1121.
Avago Fiber-optic Solutions for Unencoded Data
Since many existing copper wire communication pro-tocols transmit unencoded data, Avago has developed
a wide range of dc-coupled TTL-compatible integratedfiber-optic receivers.
Avago manufactures a wide range of fully integrated TTL-compatible receivers starting at dc to 40 KBd through dc
to 10 MBd. For best results use the recommended circuitsshown on pages 5 through 13 of this Fiber-Optic Cook-book.
For unencoded data transmission at rates between dc
and 32 MBd see the disintegrated edge detector solu-tions shown on pages 14 to 17.
Low-cost Digital Transmitters
When using Avago’s LED optical sources, inexpensivelogic-compatible fiber-optic transmitters can be imple-
mented using off-the-shelf peripheral line drivers or ad-vanced CMOS nand gates.
The logic-compatible circuits shown in this guide look deceptively simple, but have been carefully developed
to deliver the best performance possible with Avago’sLED optical transmitter components.
Using Avago’s Recommended Solutions
To avoid problems, minimize development costs andminimize time-to-market, designers are encouraged to
imbed the circuits shown in this cookbook. The completesolutions shown in this cookbook are based upon prov-
en circuits and techniques that have been demonstratedto work in numerous applications.
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5
Solution for dc to 40 KBd TTL Data at Distances
Between 0 and 53 meters.
Attributes:1) No adjustments needed.2) No receiver overdrive with short fiber-optic cables.
3) DS3631 costs roughly $0.25 and is available from National Semiconductor.4) Uses lowest cost 1 mm dia. plastic optical fiber.
5) Uses Avago’s HFBR-4531Z or HFBR-4532Z crimpless connector which can be field terminated in less than 1 minute.
References:1) HFBR-0501Z Series data sheet, Avago pub. # AV02-1501EN2) HFBR-4531Z/4532Z Crimpless Connector data sheet, Avago pub # AV02-0460EN3) Application Note 1035, Avago pub. # AV02-0730EN
Figure 2.
1
3
4
2
4
3
2
1
5
ZERO TO 53 METER LENGTH OF 1 mm DIA.
PLASTIC OPTICAL FIBER WHEN LED TRANSMITTER
ON STATE FORWARD CURRENT = 10 mA.
8
8 5
0 V
5 V
V CC
U2
HFBR-15X3Z
U3
HFBR-25X3Z
TTL
OUTPUT
TTL COMPATIBLE RECEIVER
TTL COMPATIBLE TRANSMITTER
C 3
0.1 μF
C 1
10 μF
C 2
0.1 μF
R 2
3.3 K
TTL
INPUT
0 V
5 V
VCC
1
2
6
7
4
5
3
8
+
U1
DS3631
R1
340 1%
10 mA
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6
Solution for dc to 40 KBd TTL Data at Distances
Between 0 and 1.5 kilometers.
Attributes:1) No adjustments needed.2) No receiver overdrive with short fiber-optic cables.
3) DS3631 costs roughly $0.25 and is available from National Semiconductor.4) Uses low-cost 200 Pm hard clad silica (HCS) optical fiber.5) Uses Avago’s HFBR-4521Z connector which can be field terminated in less than 1 minute.
References:1) HFBR-0501Z Series data sheet, Avago pub. # AV02-1501EN2) HFBR-0508Z Series data sheet, Avago pub. # AV02-1504EN3) Plastic Optical Fiber and HCS® Fiber Cables and Connectors, Avago pub # AV02-1508EN
Figure 3.
1
3
4
2
4
3
2
1
5
ZERO TO 1.5 K METER LENGTH OF 200 μm DIA.
HARD CLAD SILICA (HCS) OPTICAL WHEN LED TRANSMITTER
ON STATE FORWARD CURRENT = 20 mA.
8
8 5
0 V
5 V
V CC
U2
HFBR-15X8ZU3
HFBR-25X3Z
TTL
OUTPUT
TTL COMPATIBLE RECEIVER
TTL COMPATIBLE TRANSMITTER
C 3
0.1 μF
C 1
10 μF
C 2
0.1 μF
R 2
3.3 K
TTL
INPUT
0 V
5 V
VCC
1
2
6
8
7
4
5
3
+
U1
DS3631
R1
150 1%
20 mA
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7
Solution for dc to 1 MBd TTL Data at Distances
Between 0 and 10 meters.
Attributes:1) No adjustments needed.2) No receiver overdrive with short fiber-optic cables.
3) DS75451 costs roughly $0.25 and is available from National Semiconductor.4) Uses lowest cost 1 mm dia. plastic optical fiber.5) Uses Avago’s HFBR-4531Z or HFBR-4532Z crimpless connector which can be field terminated in less than 1 minute.
References:1) HFBR-0501Z Series data sheet, Avago pub. # AV02-1501EN
2) HFBR-4531Z/4532Z Crimpless Connector data sheet, Avago pub # AV02-0460EN3) Application Note 1035, Avago pub. # AV02-0730EN
Figure 4.
1
3
4
2
4
3
2
1
5
ZERO TO 10 METER LENGTH OF 1 mm DIA.
PLASTIC OPTICAL FIBER WHEN LED
ON STATE FORWARD CURRENT = 60 mA.
8
8 5
0 V
5 V
V CC
U2
HFBR-15X4ZU3
HFBR-25X4Z
TTL
OUTPUT
TTL COMPATIBLE RECEIVER
TTL COMPATIBLE TRANSMITTER
C 4
0.1 μF
C 1
10 μFC 3
1500 pF
C 2
0.1 μF
TTL
INPUT
0 V
5 V
VCC
1
2
6
7
4
5
3
+
U1
DS75451
R1
51
60 mA
8
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8
Solution for dc to 1 MBd TTL Data at Distances
Between 0 and 45 meters.
Attributes:1) No adjustments needed.2) No receiver overdrive with short fiber-optic cables.
3) DS75451 costs roughly $0.25 and is available from National Semiconductor.4) Uses lowest cost 1 mm dia. plastic optical fiber.
5) Uses Avago’s HFBR-4531Z or HFBR-4532Z crimpless connector which can be field terminated in less than 1 minute.
References:1) HFBR-0501Z Series data sheet, Avago pub. # AV02-1501EN2) HFBR-4531Z/4532Z Crimpless Connector data sheet, Avago pub # AV02-0460EN
3) Application Note 1035, Avago pub. # AV02-0730EN
Figure 5.
1
3
4
2
4
3
2
1
5
ZERO TO 45 METER LENGTH OF 1 mm DIA.
PLASTIC OPTICAL FIBER WHEN LED
ON STATE FORWARD CURRENT = 60 mA.
8
8 5
0 V
5 V
V CC
U2
HFBR-15X2Z
U3
HFBR-25X2Z
TTL
OUTPUT
TTL COMPATIBLE RECEIVER
TTL COMPATIBLE TRANSMITTER
C 4
0.1 μF
C 1
10 μFC 3
1500 pF
C 2
0.1 μF
TTL
INPUT
0 V
5 V
VCC
1
2
6
7
4
5
3
+
U1
DS75451
R1
51
60 mA
8
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9
Solution for dc to 5 MBd TTL Data at Distances
Between 0 and 16 meters.
Figure 6.
Attributes:1) No adjustments needed.
2) No receiver overdrive with short fiber-optic cables.3) DS75451 costs roughly $0.25 and is available from National Semiconductor.4) Uses lowest cost 1mm dia. plastic optical fiber.
5) Uses Avago’s HFBR-4531Z or HFBR-4532Z crimpless connector which can be field terminated in less than 1 minute.
References:1) HFBR-0501Z Series data sheet, Avago pub. # AV02-1501EN2) HFBR-4531Z/4532Z Crimpless Connector data sheet, Avago pub # AV02-0460EN
3) Application Note 1035, Avago pub. # AV02-0730EN
1
3
4
2
+
4
3
2
1
5
ZERO TO 16 METER LENGTH OF 1 mm DIA.
PLASTIC OPTICAL FIBER WHEN LED
ON STATE FORWARD CURRENT = 43 mA.
8
8 5
0 V
5 V
VCC
U2
HFBR-15X1Z
U3
HFBR-25X1Z
TTL
OUTPUT
TTL COMPATIBLE RECEIVER
TTL COMPATIBLE TRANSMITTER
C 3
0.1 μF
C 1
10 μ F
C 2
0.1 μF
TTL
INPUT
0 V
5 V
VCC
1
2
6
7
4
5
3
U1
DS75451
R1
78.7 1%
43 mA
8
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10
Solution for dc to 5 MBd TTL Data at Distances
Between 0 and 700 meters.
Attributes:1) No adjustments needed.
2) No receiver overdrive with short fiber-optic cables.3) DS75451 costs roughly $0.25 and is available from National Semiconductor.
4) Uses rugged 200 Pm dia. hard clad silica (HCS) optical fiber.5) Uses no-epoxy no-polish crimp and cleave ST or SMA optical connectors which can be field terminated.
Reference:1) HFBR-0400Z Series data sheet, Avago pub. # AV02-0176EN
Figure 7.
2
1
7
3
6
6
2
3
7
54
ZERO TO 700 METER LENGTH OF 200 μm DIA.
HARD CLAD SILICA (HCS) OPTICAL FIBER WHEN LED
ON STATE FORWARD CURRENT = 20 mA.
5 4
8 8 1
0 V
5 V
VCC
U2
HFBR-14X2Z U3
HFBR-24X2Z
TTL
OUTPUT
TTL COMPATIBLE RECEIVER
TTL COMPATIBLE TRANSMITTER
C 3
0.1 μF
C 1
10 μ F
C 2
0.1 μF
TTL
INPUT
0 V
5 V
VCC
1
2
6
7
4
5
3
U1
DS75451
R1
174 1%
20 mA
8
R2 560
+
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11
Solution for dc to 5 MBd TTL Data at Distances
Between 0 and 1.7 kilometers.
Attributes:1) No adjustments needed.2) No receiver overdrive with short fiber-optic cables.
3) DS75451 costs roughly $0.25 and is available from National Semiconductor.
4) Uses commonly available 62.5/125 Pm dia. glass optical fiber.5) Uses ST or SMA optical connectors.
Reference:1) HFBR-0400Z Series data sheet, Avago pub. # AV02-0176EN
Figure 8.
2
1
7
3
6
6
2
3
7
54
ZERO TO 1.7 KILOMETER LENGTH OF 62.5/125 μm MULTIMODE
GLASS OPTICAL FIBER WHEN LED
ON STATE FORWARD CURRENT = 48 mA.
5 4
8 8 1
0 V
5 V
V CC
U2
HFBR-14X4Z
U3
HFBR-24X2Z
TTL
OUTPUT
TTL COMPATIBLE RECEIVER
TTL COMPATIBLE TRANSMITTER
C 3
0.1 μ F
C 1
10 μF
C 2
0 .1 μ F
TTL
INPUT
0 V
5 V
V CC
1
2
6
7
4
5
3
U1
DS75451
R1
69.8 1%
48 mA
8
R2 560
+
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12
Solution for dc to 10 MBd TTL Data at Distances
Between 0 and 40 meters.
Attributes:1) No adjustments needed.
2) No receiver overdrive with short fiber-optic cables.3) DS75451 costs roughly $0.25 and is available from National Semiconductor.
4) Uses lowest cost 1 mm dia. plastic optical fiber.
5) Uses Avago’s HFBR-4531Z or HFBR-4532Z crimpless connector which can be field terminated in less than 1 minute.
References:1) HFBR-0508Z Series data sheet, Avago pub. # AV02-1504EN2) HFBR-4531Z/4532Z Crimpless Connector data sheet, Avago pub # AV02-0460EN
3) Application Note 1080, Avago pub. # AV02-0784EN
Figure 9.
1
3
4
2
4
3
2
1
5
ZERO TO 40 METER LENGTH OF 1 mm DIA.
PLASTIC OPTICAL FIBER AT 0 TO 70 CELSIUS WHEN
LED TRANSMITTER ON STATE FORWARD CURRENT = 60 mA.
8
8 5
0 V
5 V
V CC
U2
HFBR-15X8ZU3
HFBR-25X8Z
TTL
OUTPUT
TTL COMPATIBLE RECEIVER
TTL COMPATIBLE TRANSMITTER
C 3
0.1 μF
C 1
10 μF
C 2
0.1 μF
TTL
INPUT
0 V
5 VVCC
1
2
6
7
4
5
3
U1
DS75451
R2
47 1%
R1
2K 5%
60 mA
8
R3
2.7 5%
+
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Solution for dc to 10 MBd TTL Data at Distances
Between 0 and 300 meters.
Figure 10.
Attributes:1) No adjustments needed.2) No receiver overdrive with short fiber-optic cables.3) DS75451 costs roughly $0.25 and is available from National Semiconductor.
4) Uses low-cost 200 Pm hard clad silica (HCS) optical fiber.5) Uses Avago’s HFBR-4521Z connector which can be field terminated in less than 1 minute.
References:1) HFBR-0508Z Series data sheet, Avago pub. # AV02-1504EN
2) Application Note 1080, Avago pub. # AV02-0784EN3) Plastic Optical Fiber and HCS® Fiber Cables and Connectors, Avago pub. # AV02-1508EN
1
3
4
2
4
3
2
1
5
ZERO TO 300 METER LENGTH OF 200 μm DIA.
HARD CLAD SILICA (HCS) OPTICAL FIBER AT 0 TO 70 CELSIUS WHEN
LED TRANSMITTER ON STATE FORWARD CURRENT = 60 mA.
8
8 5
0 V
5 V
V CC
U2
HFBR-15X8ZU3
HFBR-25X8Z
TTL
OUTPUT
TTL COMPATIBLE RECEIVER
TTL COMPATIBLE TRANSMITTER
C 3
0.1 μF
C 1
10 μF
C 2
0.1 μF
TTL
INPUT
0 V
5 V
V CC
1
2
6
7
4
5
3
U1
DS75451
R2
47 1%
R1
2K 5%
60 mA
8
R3
2.7 5%
+
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14
Solution for dc to 32 MBd TTL Data at Distances
Between 0 and 1.3 kilometers. (Pages 14 & 15)
Figure 11. Transceiver Circuit
Table 1. Transceiver Component Values
DISTANCE @ 32 MBd 0 to 27 meters 0 to 690 meters 0 to 800 meters 0 to 1.3 K meters
TRANSMITTER HFBR-15X7Z
650 nm LED
HFBR-15X7Z
650 nm LED
HFBR-14X4Z
820 nm LED
HFBR-13X2TZ
1300 nm LED
RECEIVER HFBR-25X6Z HFBR-25X6Z HFBR-24X6Z HFBR-23X6TZ
FIBER TYPE 1 mm Plastic 200 Pm HCS 62.5/125 Pm 62.5/125 PmR1 120: 33: 33: 22:
R2 120: 33: 33: 27:
R3 390: 270: 270: f
C3 82 pF 470 pF 75 pF 150 pF
C5
0.1 μF
C8
0.1 μF
C13
0.1 μF
C9
0.1 μF
C10
10 μ F
R5 4.7
R8 120 K
R9 120 K
R12 2.2 K
R4 4.7
C11
0.1 μFC12
10 μF
9
1012
13
11
8
U1C
74ACTQ00
U1D
74ACTQ00
L1
TDK#HF30ACB453215
J1
TRANSCEIVER I/O
4
5
6
U1B
74ACTQ00
1
2
3
U1A
74ACTQ00
C1
0.1 μF
C2
10 μ F
L2
COILCRAFT 1008LS-122XKBC
L3
COILCRAFT 1008LS-122XKBC
GND
RD-
RD+
NC
VccVcc TD
NC
GND
1
2
3
45
6
7
8
9
R6
270
R7
270
R10
240
R11
240
C6
C7
U4
LT1016CS8
76
4
2
385
1
6
1 8
4 5
2
3
7U3B
HFBR-24X6Z
2
1 8
4 5
6
7
3U2B
HFBR-14X4Z
1
2
3
4
8
5
U2A
HFBR-15X7Z
1
2
3
4
8
5
U3A
HFBR-25X6Z
R3
R1 R2
C3
+
+
+
C6 = C7 =2
(3) (R6 + R7) [DATA RATE (Bd)]
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Attributes:1) Can be used with unencoded data.2) No analog circuit design needed.3) No printed circuit design needed.
4) Printed circuit design can be electronically imported from web address:http://www.avagotech.com/docs/MPUB-1075
Electronic files contain:a) Transceiver schematic
b) Printed circuit artwork c) Material list
5) No adjustments needed.6) No receiver overdrive with short fiber-optic cables.7) Uses low-cost off-the-shelf integrated circuits from Fairchild and Linear Technology.
8) One transceiver design can be used to address a wide range of applications.9) Can be used with 1 mm dia. POF for lowest cost, 200Pm HCS, or 62.5/125 Pm multimode glass optical fibers for
greater distances.10) POF or HCS fiber connectors can be field terminated in less than 1 minute.
For POF use the HFBR-4531Z connector, for HCS fiber use HFBR-4521Z connector.
References:1) HFBR-0507Z Series data sheet, Avago pub. # AV02-1502EN2) HFBR-0400Z Series data sheet, Avago pub. # AV02-0176EN3) HFBR-0300Z Series data sheet, Avago pub. # AV02-1500EN
4) HFBR-4531Z/4532Z Crimpless Connector data sheet, Avago pub # AV02-0460EN5) Plastic Optical Fiber and HCS® Fiber Cables and Connectors, Avago pub # A02-1508EN
6) Application Note 1121, Avago pub. # AV02-0723EN
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Solution for dc to 32 MBd TTL Data at Distances
Between 0 and 3.3 kilometers. (Pages 16 & 17)
Figure 12. Transceiver Circuit
Table 2. Transceiver Component Values
DISTANCE
@ 32 MBd 0 to 42 meters 0 to 1K meters 0 to 1.6K meters 0 to 3.3K meters
TRANSMITTER HFBR-15X7Z650 nm LED
HFBR-15X7Z650 nm LED
HFBR-14X4Z820 nm LED
HFBR-13X2TZ1300 nm LED
RECEIVER HFBR-25X6Z HFBR-25X6Z HFBR-24X6Z HFBR-23X6TZ
FIBER TYPE 1 mm Plastic 200 Pm HCS 62.5/125 Pm 62.5/125 Pm
R1 120: 33: 33: 22:
R2 120: 33: 33: 27:
R3 390: 270: 270: f
C3 82 pF 470 pF 75 pF 150 pF
C50.1 μF
C8
0.1 μF
C11
0.1 μF
C12
0.1 μF
C13
10 μ F
R5 4.7
R9
51
R17 68 K
R18 68 K
R21
2.2 K
R4
4.7C140.1 μFC15
10 μF
9
1012
13
11
8
U1C
74ACTQ00
U1D
74ACTQ00
L1
TDK#HF30ACB453215
J1
TRANSCEIVER
I/O
4
5
6
U1B
74ACTQ00
1
2
3
U1A
74ACTQ00
C1
0.1 μF
C2
10 μ F
L2
COILCRAFT 1008LS-122XKBC
L3
COILCRAFT 1008LS-122XKBC
GND
RD-
RD+
NC
Vcc
Vcc TD
NC
GND
1
2
3
4
5
6
7
8
9
R15
270
R16
270
R19
240
R20
240
C9
C10
U4
LT1016CS8
7
64
2
38
51
R3
R1 R2
C3
+
C6
0.1 μF
R8
51R6
2.4 K
R11
2.4 K
+
MMPQ3904
MMPQ3904
1 2 3 4
15 13
1416
R14
470
R13
470
R12
1.5 K
R7
1.5 K R10
110
5 6 7 8
11 9
1012
C7
0.1 μF
+
8
5
U2A
HFBR-15X7Z
1 8
4 5
U2B
HFBR-14X4Z
1 8
4 5U3B
HFBR-24X6Z
C13
0.1 μF
1234
8
5
U3AHFBR-25X6Z
6237
2673
1234
C9 = C10 =2
(3) (R6 + R7) [DATA RATE (Bd) ]
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Attributes:1) Can be used with unencoded data.2) No analog circuit design needed.3) No printed circuit design needed.
4) Printed circuit design can be electronically imported from web address:http://www.avagotech.com/docs/MPUB-1076
Electronic files contain:a) Transceiver schematic
b) Printed circuit artwork c) Material list
5) No adjustments needed.6) No receiver overdrive with short fiber-optic cables.7) Uses low-cost off-the-shelf integrated circuits from Fairchild, Motorola, and Linear Technology.
8) One transceiver design can be used to address a wide range of applications.9) Can be used with 1 mm dia. POF for lowest cost, 200Pm HCS, or 62.5/125 Pm multimode glass optical fibers for
greater distances.10) POF or HCS fiber connectors can be field terminated in less than 1 minute.
For POF use the HFBR-4531Z connector, for HCS fiber use HFBR-4521Z connector.
References:1) HFBR-0507Z Series data sheet, Avago pub. # AV02-1502EN2) HFBR-0400Z Series data sheet, Avago pub. # AV02-0176EN3) HFBR-0300Z Series data sheet, Avago pub. # AV02-1500EN
4) HFBR-4531Z/4532Z Crimpless Connector data sheet, Avago pub # AV02-0460EN5) Plastic Optical Fiber and HCS® Fiber Cables and Connectors, Avago pub # AV02-1508EN
6) Application Note 1121, Avago pub. # AV02-0723EN
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Solution for 2 to 70 MBd TTL Data at Distances
Between 0 and 3.8 kilometers. (Pages 18 & 19)
Figure 13. Transceiver Circuit
Table 3. Transceiver Component Values
DISTANCE
@ 50 MBd 0 to 80 meters 0 to 300 meters 0 to 1.5K meters 0 to 3.8K meters
TRANSMITTER HFBR-15X7Z650 nm LED
HFBR-15X7Z650 nm LED
HFBR-14X4Z820 nm LED
HFBR-13X2TZ1300 nm LED
RECEIVER HFBR-25X6Z HFBR-25X6Z HFBR-24X6Z HFBR-23X6TZ
FIBER TYPE 1 mm Plastic 200 Pm HCS 62.5/125 Pm 62.5/125 Pm
R1 120: 33: 33: 22:
R2 120: 33: 33: 27:
R3 390: 270: 270: f
C3 82 pF 470 pF 75 pF 150 pF
R5 4.7 R4 4.7
C6
0.1 μF
C17
0.1 μF
C13 0.1 μF
C14
0.1 μF
9
1012
13
11
8
U1C
74ACTQ00
U1D
74ACTQ00
J1
TRANSCEIVER
I/O
4
5
6
U1B
74ACTQ00
1
2
3
U1A
74ACTQ00
C1
0.1 μF
C2
10 μF
L3
L2
COILCRAFT 1008LS-122XKBC
COILCRAFT
1008LS-122XKBC
GND
RD-
RD+
SD
VccVcc
TDNC
GND
1
2
3
4
5
6
78
9
R9
1 K
R8
510R7
510
R6 1.2 K
R3
R1 R2
C3
C16
10 μ F
C15
10 μ F
R190 OHM JUMPER
R12
(NOT LOADED)
R13(NOT LOADED)
C11
0.1 μF
C5
0.1 μF
8
76
5
1
2
3
4
D1
HLMP-4700
++
+
U5
HCPL-0701
C12
0.1 μF
C8
0.1 μF
U4
ML4624
NC
CTIMER
VREF
VthADJ
GND
TTL OUT
VCC TTL
25
24
23
22
21
20
19
V IN-
V IN+
NC
VDC
CF2
CF1
NC G N D T T L
E C L +
E C L -
N C
N C
N C
N C
N C
N C
V C C
N C
T T L L I N K M O N
C M P E N A B L E N
C5
6
7
8
9
10
11
2726 28 1 2 3 4
1718 16 15 14 13 12
C9
U3AHFBR-25X6Z
C7
0.1 μF
C10
0.047
1 8
4 5 U3B
HFBR-24X6Z
6237
8
5
U2A
HFBR-15X7Z
1 8
4 5U2B
HFBR-14X4Z
2673
1234
1234
8
5
L1
TDK#HF30ACB453215
When data rate is ≤ 20 MBd then
When data rate ≥ 20 MBd delete C9.
C9 =1
2π800 (Bd)- [4 (pF) ]
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Attributes:1) Intended for applications that use encoded data.2) No analog circuit design needed.3) No printed circuit design needed.
4) No adjustments needed.5) No receiver overdrive with short fiber-optic cables.
6) Uses low-cost off-the-shelf integrated circuits from Fairchild and Micro Linear.7) One transceiver design can be used to address a wide range of applications.
8) Can be used with 1 mm dia. POF for lowest cost, 200Pm HCS, or 62.5/125 Pm multimode glass optical fibers forgreater distances.
9) POF or HCS fiber connectors can be field terminated in less than 1 minute.For POF use the HFBR-4531Z connector, for HCS fiber use HFBR-4521Z connector.
References:1) HFBR-0507Z Series data sheet, Avago pub. # AV02-1502EN.2) HFBR-0400Z Series data sheet, Avago pub. # AV02-0176EN.
3) HFBR-0300Z Series data sheet, Avago pub. # AV02-1500EN.4) HFBR-4531Z/4532Z Crimpless Connector data sheet, Avago pub # AV02-0460EN.
5) Plastic Optical Fiber and HCS® Fiber Cables and Connectors, Avago pub # AV02-1508EN.
6) Application Note 1122, Avago pub. # AV02-0721EN.
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Solution for 20 to 160 MBd +5V ECL (PECL) Data at Distances between 0 and 2
kilometers. (Pages 20-22)
Figure 14. Transceiver Circuit
Table 4. Transceiver Component Values
DISTANCE
@ 160 MBd 0 to 50 meters 0 to 50 meters 0 to 500 meters 0 to 2K meters
TRANSMITTER HFBR-15X7Z650 nm LED
HFBR-15X7Z650 nm LED
HFBR-14X4Z820 nm LED
HFBR-13X2TZ1300 nm LED
RECEIVER HFBR-25X6Z HFBR-25X6Z HFBR-24X6Z HFBR-23X6TZ
FIBER TYPE 1 mm Plastic 200 μm HCS 62.5/125 μm 62.5/125 μm
R8 301 Ω 82.5 Ω 84.5 Ω 78.7 Ω
R9 301 Ω 82.5 Ω 84.5 Ω 78.7 Ω
R10 15 Ω 15 Ω 56 Ω 47 Ω
R11 1K Ω 475 Ω 2.2K Ω ∞
C8 43 pF 120 pF 33 pF 56 pF
Note the transceiver only requires a +5V power supply. The receiver circuit’s +3 V bus is created using the TL431CD shunt regula-
tor, and Vbb, which equals +3.7 V, is a bias source located within the MC10H116FN.
C16
0. 1 μ F
9
10
12
13
11
8
U1C
74ACTQ00
U1D
74ACTQ00
Q2
BFT92Q1
BFT92
L1
TDK#HF30ACB453215
J1
TRANSCEIVER I/O
4
5
6
U1B
74ACTQ00
1
27
3
U1A
74ACTQ00
C7
0.001 μF
C6
0 .1 μ F
C3
0 .1 μ F
C5
10 μ F
C4
0.001 μF
TX GND
TD+
TD-
TX V ccRX V cc
NC
RD-
RD+RX GND
9
8
7
6
5
4
3
2
1
2
1 8
4 5
6
7
3
U2B
HFBR-14X4Z
1
2
3
4
8
5
U2A
HFBR-15X7Z
R11
R10C8
C20 .1 μ FC10.001 μFR522
R6
91
R7
91
R8
R9
Q3
MMBT3904LT1
6
1 8
4 5
2
3
7
U3B
HFBR-24X6Z
1
2
3
4
5
U3A
HFBR-25X6Z
C20
1 0 μ F
R24
1 K
R22
1 K
R25
1 K R23
1 K
U4C
MC10H116FN
18
+3 VVbb
Vbb
19 17
15
U4A
MC10H116FN
4
3 7
10
5
C15
0. 1 μ F
R19
51
R16
51
U4B
MC10H116FN
8
9
202
12
14
13
R18
51R17
51
+3 V
C17
0. 1 μ F Vbb
C10
0 .1 μ F
R12 4.7
C9
0 .1 μ F
C12 0.1 μF
R134.7
R14
1 K
C11 0.1 μF
Vbb
R15
1 K
C13
0. 1 μ F
C14
10 μ F
R20
12
R21
62
1
82, 3, 6, 7
U5
TL431CD
+
+
+
C190 .1 μ FC18
0. 1 μ F8
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Attributes:1) Intended for applications that use encoded data.2) Can be used with off-the-shelf physical layer chips such as the Cypress HOTLink™ to build low-cost byte-to-light
protocol-independent data communication links.3) No analog circuit design needed.
4) No printed circuit design needed.5) Printed circuit design can be electronically imported from web address:-
http://www.avagotech.com/docs/MPUB-1073Electronic files contain:a) Transceiver schematic
b) Printed circuit artwork c) Material list
6) No adjustments needed.7) No receiver overdrive with short fiber-optic cables.8) Uses low-cost off-the-shelf integrated circuits from Fairchild, Motorola, and Texas Instruments.
9) One transceiver design can be used to address a wide range of applications.10) Can be used with 1 mm dia. POF for lowest cost, 200 Pm HCS, or 62.5/125 Pm multimode glass optical fibers for
greater distances.11) POF or HCS fiber connectors can be field terminated in less than 1 minute.
For POF use the HFBR-4531Z connector, for HCS fiber use HFBR-4521Z connector.
References:1) HFBR-0507Z Series data sheet, Avago pub. # AV02-1502EN.2) HFBR-0400Z Series data sheet, Avago pub. # AV02-0176EN.
3) HFBR-0300Z Series data sheet, Avago pub. # AV02-1500EN.4) HFBR-4531Z/4532Z Crimpless Connector data sheet, Avago pub # AV02-0460EN.5) Plastic Optical Fiber and HCS® Fiber Cables and Connectors, Avago pub # AV02-1508EN.
6) Application Note 1123, Avago pub. # AV02-0728EN
Figure 15. Byte-to-light interface between PECL-compatible fiber-optic transceivers
and off-the-shelf PHY chips, such as Cypress Semiconductor’s HOTLink™.
82
82
0.1 μF
0.1 μF
0.1 μF10 μ F
10 μ F
1.2 μH
+5 V
NOISY HOST
SYSTEM POWER
1.2 μH
+
+8282
120120
CONVENTIONAL
TTL DATA BUS
120
Zo = 50 OHMS
Zo = 50 OHMS
SERIAL +5V ECL DATA
120
1.2 μH
9 TX V EE
8 TD+
7 TD-
6 TX V cc
5 RX V cc
4 SD+
3 RD-
2RD+
1 RX V EE
FIBER-OPTIC
TRANSCEIVER
SHOWN IN
FIGURE 14
SIGNAL DETECT
DESERIALIZER
SERIALIZER
Zo = 50 OHMS
Zo = 50 OHMSSERIAL +5V ECL DATA
0.1 μF
RECOMMENDED POWER SUPPLY FILTER AND +5 V ECL
(PECL) SIGNAL TERMINATIONS FOR THE CYPRESS HOTLink
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Distance vs. Data rate HFBR-14X4Z and HFBR-24X6Z,
PECL Transceiver with 62.5 Pm Fiber
Figure 16 shows the distances and data rates achievablewhen Avago’s HFBR-14X4Z and HFBR-24X6Z 820 nm
components are used with 62.5/125 Pm graded indexmultimode glass fibers.
To obtain this performance the recommended circuitsshown in Application Bulletin 78, or Application Note
1123, MUST be used.
Figure 16.
Distance vs. Data rate HFBR-14X4Z and HFBR-24X6Z,
TTL Transceiver with 62.5 Pm Fiber
Figure 17 shows the distances and data rates achievablewhen Avago’s HFBR-14X4Z and HFBR-24X6Z 820 nm
components are used with 62.5/125 Pm graded indexmultimode glass fibers.
To obtain this performance the recommended circuitsshown in Application Note 1038, Application Note 1065,
or Application Note 1122 MUST be used.
Figure 17.
160
140
120
100
80
60
40
20
10100 200 400 600 800 1K 2K 3K
L - LENGTH - METERS
D A T A R A T E - M I L L I O N S O F S Y M B O
L S / S E C - M B d
RECOMMENDED OPERATING REGION WHEN
USING HFBR-14x4Z AND HFBR-24x6Z 820 nm
COMPONENTS IN THE CIRCUITS RECOMMENDED
IN APPLICATION BULLETIN 78 OR APPLICATION
NOTE 1123 WITH 62.5/125 μm GRADED INDEX
GLASS MULTIMODE OPTICAL FIBERS
160
140
120
100
80
60
40
20
10100 200 400 600 800 1K 2K 3K
L - LENGTH - METERS
D A T A R A T E - M I L L I O N S O F S Y M B O
L S / S E C - M B d
RECOMMENDED OPERATING REGION WHEN
USING HFBR-14x4Z AND HFBR-24x6Z 820 nm
COMPONENTS IN THE CIRCUITS RECOMMENDED
IN APPLICATION NOTE 1038, APPLICATION NOTE
1065 OR APPLICATION NOTE 1122, WITH 62.5/125 μm
GRADED INDEX GLASS MULTIMODE OPTICAL FIBERS
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Distance vs. Data rate HFBR-15X7Z and HFBR-25X6Z,
PECL Transceiver with 1 mm POF Fiber
Figure 18 shows the distances and data rates achievablewhen using Avago’s HFBR-15X7Z and HFBR-25X6Z 650
nm components with low numerical aperture 1 mm di-ameter POF.
To obtain this performance the recommended circuitsshown in Application Note 1066, or Application Note
1123, MUST be used.
Figure 18.
Distance vs. Data rate HFBR-15X7Z and HFBR-25X6Z,
TTL Transceiver with 1 mm POF Fiber
Figure 19 shows the distances and data rates achievablewhen using Avago’s HFBR-15X7Z and HFBR-25X6Z 650
nm components with low numerical aperture 1 mm di-ameter POF.
To obtain this performance the recommended circuitsshown in Application Note 1122 MUST be used.
Figure 19.
160
140
120
100
80
60
40
20
1010 20 40 60 80 100 200 300
L - LENGTH - METERS
D A T A R A T E - M I L L I O N S O F S Y M
B O L S / S E C - M B d
RECOMMENDED OPERATING
REGION WHEN USING HFBR-15x7Z
AND HFBR-25x6Z 650 nm FIBER OPTIC
COMPONENTS IN THE CIRCUITS
RECOMMENDED IN APPLICATION
NOTE 1066 OR APPLICATION
NOTE 1123 WITH LOW NA (NA = 0.35)
STEP INDEX 1 mm DIAMETER PLASTIC
OPTICAL FIBERS
160
140
120
100
80
60
40
20
1010 20 40 60 80 100 200 300
L - LENGTH - METERS
D A T A R A T E - M I L L I O N S O F S Y M
B O L S / S E C - M B d
RECOMMENDED OPERATING REGION
WHEN USING HFBR-15x7Z AND HFBR-25x6Z
650 nm FIBER-OPTIC COMPONENTS IN
THE CIRCUITS RECOMMENDED
IN APPLICATION NOTE 1122 WITH LOW
NA (NA = 0.35) STEP INDEX 1 mm
DIAMETER PLASTIC OPTICAL FIBERS
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Distance vs. Data rate HFBR-15X7Z and HFBR-25X6Z,
PECL Transceiver with 200 Pm HCS Fiber
Figure 20 shows the distances and data rates achievablewhen using Avago’s HFBR-15X7Z and HFBR-25X6Z 650
nm components with 200 Pm diameter HCS.
To obtain this performance the recommended circuitsshown in Application Note 1066, or Application Note1123, MUST be used.
Figure 20.
Distance vs. Data rate HFBR-15X7Z and HFBR-25X6Z,
TTL Transceiver with 200 Pm HCS Fiber
Figure 21 shows the distances and data rates achievablewhen using Avago’s HFBR-15X7Z and HFBR-25X6Z 650
nm components with 200 Pm diameter HCS.
To obtain this performance the recommended circuitsshown in Application Note 1122 MUST be used.
Figure 21.
160
140
120
100
80
60
40
20
1010 20 40 60 100 200 400 600 1K
L - LENGTH - METERS
D A T A R A T E - M I L L I O N S O F S
Y M B O L S / S E C - M B d
RECOMMENDED OPERATING REGION WHEN
USING HFBR-15x7Z AND HFBR-25x6Z 650 nm
COMPONENTS IN THE CIRCUITS RECOMMENDED
IN APPLICATION NOTE 1066 OR APPLICATION
NOTE 1123 WITH 200 μm HCS STEP INDEX
MULTIMODE OPTICAL FIBERS
160
140
120
100
80
60
40
20
10
10 20 40 60 100 200 400 600 1K
L - LENGTH - METERS
D A T A R A T E - M I L L I O N S O F S Y M B O L S / S E C - M B d
RECOMMENDED OPERATING REGION WHEN
USING HFBR-15x7Z AND HFBR-25x6Z 650 nm
COMPONENTS IN THE CIRCUITS RECOMMENDED
IN APPLICATION NOTE 1122 WITH 200 μm HCS
STEP INDEX MULTIMODE OPTICAL FIBERS
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Distance vs. Data rate HFBR-13X2TZ and HFBR-23X6TZ,
PECL Transceiver with 62.5 Pm Fiber
Figure 22 shows the distances and data rates achievablewhen Avago’s HFBR-13X2TZ and HFBR-23X6TZ 1300 nm
components are used with 62.5/125 Pm graded indexmultimode glass fibers.
To obtain this performance the recommended circuitsshown in Application Note 1123 MUST be used.
Figure 22.
Distance vs. Data rate HFBR-13X2TZ and HFBR-23X6TZ,
TTL Transceiver with 62.5 Pm Fiber
Figure 23 shows the distances and data rates achievablewhen Avago’s HFBR-13X2TZ and HFBR-23X6TZ 1300 nm
components are used with 62.5/125 Pm graded indexmultimode glass fibers.
To obtain this performance the recommended circuitsshown in Application Note 1122 MUST be used.
Figure 23.
160
140
120
100
80
60
40
20
10100 200 400 600 1K 2K 4K 6K
L - LENGTH - METERS
D A T A R A T E - M I L L I O N S O F S
Y M B O L S / S E C - M B d
RECOMMENDED OPERATING REGION WHEN
USING HFBR-13x2TZ AND HFBR-23x6TZ 1300 nm
COMPONENTS IN THE CIRCUITS RECOMMENDED
IN APPLICATION NOTE 1123 WITH 62.5/125 μm
GRADED INDEX MULTIMODE OPTICAL FIBERS
160
140
120
100
80
60
40
20
10100 200 400 600 1K 2K 4K 6K
L - LENGTH - METERS
D A T A R A T E - M I L L I O N S O F S Y M B O L S / S E C - M B d
RECOMMENDED OPERATING REGION WHEN
USING HFBR-13x2TZ AND HFBR-23x6TZ 1300 nm
COMPONENTS IN THE CIRCUITS RECOMMENDED
IN APPLICATION NOTE 1122 WITH 62.5/125 μm
GRADED INDEX MULTIMODE OPTICAL FIBERS
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Application Notes for Plastic and Glass Optical Fiber Components
Title
Low-Cost Fiber-Optic Links for Digital Applications up to 155 MBd (AB78)
Data Rate & Logic Interfaces 1 to 155 MBd ECL, +5V ECL (PECL), TTL
Versatile Link (AN 1035)
Data Rate & Logic Interfaces dc to 5 Mbd TTL, CMOS
Fiber-Optic Solutions for 125 MBD Data Communication Applications at Copper Wire Prices (AN 1066)
Data Rate & Logic Interfaces 1 to 155 MBd +5V ECL (PECL)
DC to 10 MBd Versatile Link (AN 1080)
Data Rate & Logic Interfaces dc to 10 MBd TTL, CMOS
DC to 32 MBd Fiber-Optic Solutions for Industrial, Medical, Telecom, and Proprietary Data Communication Applications(AN 1121)
Data Rate & Logic Interfaces dc to 32 MBd TTL
2 to 70 MBd Fiber-Optic Solutions for Industrial, Medical, Telecom, and Proprietary Data Communication Applications(AN 1122)
Data Rate & Logic Interfaces 2 to 70 MBd TTL
20 to 160 MBd Fiber-Optic Solutions for Industrial, Medical, Telecom, and Proprietary Data Communication Applications (AN 1123)
Data Rate & Logic Interfaces 20 to 160 MBd +5V ECL (PECL)
Generic Printed Circuit Layout Rules for Avago’s Low-Cost Fiber-Optic Components (AN 1137)
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27
Best Practices for Using Fiber-Optic Components
(Common Do’s and Don’ts)
# Do’s Don’ts
1 Whenever possible use the circuits Avoid changing the recommended
recommended in Avago’s published circuits. Small changes in circuit topologyapplication notes. can dramatically impact the performance
of the fiber-optic data link.
2 When possible use the components Do not change the recommended
recommended in the material lists components. Component changes
provided in Avago’s application notes can dramatically impact the performance
of the data communication link.
3 Use Avago’s printed circuit layout Don’t assume circuit layout
when it is compatible with internal is trivial. If you must change the
construction/assembly techniques. layout follow the design rules in AN-1137.
4 If you need to make circuit or Don’t assume that the changes
component changes contact the you desire are harmless. The
Customer Response Center at simple robust circuits shown in
1-800-235-0312 to access the impact. Avago’s published application notes
took many man-years to develop.
5 Use the LED driver circuits Do not assume that LED driver
recommended in Avago’s application design is trivial. The LED drivers
notes. in Avago’s application notes have been
optimized to minimize cost and maximize
performance.
6 Data communication LEDs should Data communication LEDs are not
only be operated in forward biased intended to be operated in
or zero biased modes. the reversed biased mode.
7 Forward bias current must be Do not connect LEDs directly to
limited to a value less than the voltage sources. LEDs are current
absolute maximum value specified operated devices, so excessive
on Avago’s published data sheets. current can flow when directly
When connected to a voltage source connected to a low impedance
a series current limiting resistor is voltage source.
required.
8 Be careful when using in circuit Do not assume that the ac stimulus sources
(bed of nails) testers. In circuit embedded inside your in circuit testertesters with adjustable current are safe to use with data communication
limits must be set to values less than LED transmitters. LEDs are current operated
the absolute maximum current allowed devices that can be electrically
by the LED’s data sheet. Use external overstressed when directly connected to
resistors to limit the current applied if voltage sources.
the in circuit tester does not have
programmable current limits.
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For product information and a complete list of distributors, please go to our web site: www.avagotech.com
Avago, Avago Technologies, and the A logo are trademarks of Avago Technologies in the United States and other countries.
Data subject to change. Copyright © 2005-2010 Avago Technologies. All rights reserved. Obsoletes 5968-5630E
# Do’s Don’ts
9 Semi-discrete fiber-optic receivers Do not assume that the ac stimulus
can be damaged by in circuit testers. applied by your in circuit tester can
Limit the amplitude to 100 mV peak- safely be connected to quantizer’s
to-peak if you want to apply ac input. In circuit testers can apply
stimulus at the input stage of the 5-volt logic compatible signals
receiver’s post-amplifier that will damage the output stage
comparator (quantizer). of the PIN pre-amp hybrid circuit
used as the first stage of the semi-
discrete receiver.
10 The PECL logic outputs of Do not assume that the ac stimulus
high-speed fiber-optic receivers applied by your in circuit tester can
could potentially be damaged by safely be connected to the physical
in circuit testers. When testing the layer chip’s serial input. In circuit
PECL compatible inputs of physical testers can apply 5-volt logic
layer integrated circuits restrict ac compatible signals that could
stimulus to less than 100 mV potentially damage the output
peak-to-peak. stage of PECL compatible
receiver circuits.
11 Use the recommended power Do not disregard Avago’s power
supply filter circuits shown in supply filter recommendations.
Avago’s published application notes.
12 If you use a switching power Do not assume that Avago’s
supply know the frequency it recommended filter circuit
operates at and check to see if will protect the fiber-optic
additional power supply filtering transceiver from a noisy
is needed at that frequency. switching power supply.
13 If your system contains other Do not assume that Avago’slow-frequency noise sources be recommended filter circuit
sure that your system contains will protect the fiber-optic
enough power supply filtering to transceiver from low
control power supply ripple. frequency noise sources.
Avago’s recommended power supply
filters are very effective against
noise at frequencies
greater than 1 MHz.