8/10/2019 Types of DWDM

1/21

Various Types of

DWDM Systems

C M JALAL, SDE,STR, BSNL, ALUVA

8/10/2019 Types of DWDM

2/21

Why DWDM?

Dense wavelength division multiplexingpermits rapid network deployment andsignificant network cost reduction.

Use of DWDM allows deployment of lessfiber and hardware with more bandwidth

being available relative to standard SDHnetworks.

8/10/2019 Types of DWDM

3/21

How does DWDM work ?

DWDM combines multiple optical input signals to amplifythem as a group and transport them on a single fiber.

DWDM can do all this while maintaining performance,reliability and robustness.

8/10/2019 Types of DWDM

4/21

How does DWDM work ?

DWDM works by combining and transmittingmultiple signals simultaneously at differentwavelengths on the same fiber. In effect, onefiber is transformed into multiple virtual fibers.

http://www.webopedia.com/TERM/F/Fibre_Channel.htmhttp://www.webopedia.com/TERM/F/Fibre_Channel.htm

8/10/2019 Types of DWDM

5/21

How does DWDM work ?

07/01/2015 CEG4183: DWDM 5

8/10/2019 Types of DWDM

6/21

Network Elementsin a DWDM System

CLIENT

EQUIPMENTS

OTM

O

ADM

CLIENT

EQUIPMENTS

OTM

CLIENTEQUIPMENTS

8/10/2019 Types of DWDM

7/21

Network Elementsin a DWDM System

OTM -OPTICAL TERMINAL MULTIPLEXER

End element in the link.

Multiplexes / Demultiplexes all the channels

and transmit / receive the optical signals.

OADM -OPTICAL ADD/DROP MULTIPLEXER

Used to add/drop optical signals to and from the

local station.

CLIENT EQUIPMENTS

Traffic to be passed through the DWDM

8/10/2019 Types of DWDM

8/21

Network Elementsin a DWDM System

8/10/2019 Types of DWDM

9/21

Types of DWDM Systems

2.5G Systems

10G Systems

8/10/2019 Types of DWDM

10/21

2.5G DWDM SYSTEMS

`2.5 Gbps

Transmitter

MUX

DEMUX

OPTICALFIBER

2.5 Gbps

Transmitter

2.5 GbpsTransmitter

2.5 GbpsTransmitter

2.5 GbpsReceiver

2.5 Gbps

Receiver

2.5 GbpsReceiver

2.5 GbpsReceiver

l1

l2

l31

l32

l1

l2

l31

l32

OA OA

8/10/2019 Types of DWDM

11/21

2.5G DWDM SYSTEMS

Channels are termed as Lambda

Line rate : STM16 / 2.5 Gbps

Systems available with 16 / 32Channels / Lambda

40 / 80 Gbps Capacity

Supports STM16 SDH and

1G Ethernet clients

8/10/2019 Types of DWDM

12/21

2.5 G UTL DWDM TERMINAL BLOCK DIAGRAM

MUXI/L=6dbm

Transponder 1

Transponder 32

Line out +/- 1dbm

Line IN -16 dbmFor ind. Chl.

MUX MON.OSA

OBA OUT MON.(OSA)Total power -4dbm

Ind.chl.power -19dbm

OPA OUT MON(OSA)Total power -13 dbmInd. Chl power -28 dbm

Comp.power+8dbm

25 db gainTX O/P +19dbm

I/P -6dbm

OBA

OPA

RX I/P +3 TO -8 dbm

I/P -5dbm

DMUXI/L=6dbm

DMUX MON.OSA

O/P +10dbmInd. Chl power -5dbm

I/P Comp.power0 to +5dbm

5db attenator

O/P +/- 1dbm

I/P -12 dbm

I/P -12 dbm

O/P +/- 1dbm

Ind. Chl power +4 dbm

15 db gain

8/10/2019 Types of DWDM

13/21

2.5G DWDM SYSTEMS

Types of Interfaces

WCC :Wavelength Conversion Card

WMU :Wavelength Multiplexer unit DMU :Wavelength De-multiplexer unit

WBA :Wavelength Booster Amplifier

WPA :Wavelength Pre- Amplifier SCC :System control card

8/10/2019 Types of DWDM

14/21

Monitoring of Parameters

Important Monitoring ParametersAmplifier side1. OBA Input Power (+3 to -8 dBm)2. OBA Output Power (+19 dBm)

3. OPA Input Power (+3 to -8 dBm)4. OPA Output Power (+10 dBm)Channel side1. Client Input Power (-12 to -22 dBm)2. Client Output Power (+/- 1 dBm)3. Line Input Power (-12 to -22 dBm)4. Line Output Power (+/- 1 dBm)

8/10/2019 Types of DWDM

15/21

10G DWDM SYSTEMS

`10 Gbps

Transmitter

MUX

DEMUX

OPTICALFIBER

10 Gbps

Transmitter

10 GbpsTransmitter

10 GbpsTransmitter

10 GbpsReceiver

10 Gbps

Receiver

10 GbpsReceiver

10 GbpsReceiver

l1

l2

l39

l4

l1

l2

l39

l4

OA OA

8/10/2019 Types of DWDM

16/21

8/10/2019 Types of DWDM

17/21

OTM Signal Flow

8/10/2019 Types of DWDM

18/21

10G DWDM SYSTEMS

Types of Interfaces OTU :Optical Transponder units

Multiplexer unit 40 Channel

De-Multiplexer unit 40 Channel OBA :Optical Boost Amplifier

OPA :Optical Pre- Amplifier

SCC :System control card FIM :Fiber Interface Module

DCM :Dispersion compensation module

8/10/2019 Types of DWDM

19/21

Major Equipment Vendors

Ciena Corp. United States Infinera Corp. -United States

Xtera Communications Inc. -United States

Nortel Networks Ltd. -Canada Siemens AG -Germany

Alcatel-Lucent -France

Ericsson AB Sweden

ZTE Corp. China

Huawei Technologies Co. Ltd. -China

United Telecoms Ltd -India

8/10/2019 Types of DWDM

20/21

FUTURE IN DWDM

With the successful deployments of densewavelength division multiplexing (DWDM)in telecommunications networks, capacityof optical fibers has grown to multi-

terabits per second.

Changes are being proposed in theInternet Protocol (IP) to be able tosupport high-speed switching in DWDMnetworks eliminating SDH layers.

8/10/2019 Types of DWDM

21/21