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LIGHT PEAK TECHNOLOGY
SEMINAR REPORT
Submitted in the partial fulfillment of the award of the degree
of
Bachelor of Technology in
Electronics and Communication Engineering of
Cochin University of Science and Technology
GEORGE RAHUL PAUL
OCTOBER 2011
Department of Electronics & Communication Engineering
College of Engineering, Chengannur-689121
Phone: (0479) 2454125, 2451424 Fax: (0479) 2451424
LIGHT PEAK TECHNOLOGY
SEMINAR REPORT
Submitted in the partial fulfillment of the award of the degree
of
Bachelor of Technology in
Electronics and Communication Engineering of
Cochin University of Science and Technology
GEORGE RAHUL PAUL
OCTOBER 2011
Department of Electronics & Communication Engineering
College of Engineering, Chengannur-689121
Phone: (0479) 2454125, 2451424 Fax: (0479) 2451424
COLLEGE OF ENGINEERING, CHENGANNUR
KERALA
DEPARTMENT OF ELECTRONICS AND COMMUNICATION
ENGINEERING
CERTIFICATE
This is to certify that the seminar entitled
LIGHT PEAK TECHNOLOGY
Submitted by,
George Rahul Paul
is a bonafide record of the work done by him
Head of the Department Co-ordinator
ACKNOWLEDGEMENT
First and foremost I would like to thank GOD ALMIGHTY for giving me the strength and
confidence to see this seminar through and make it a reality.
With immense gratitude, I acknowledge all those who contributed with their valuable
suggestions and timely assistance towards the completion of this seminar.
I am grateful to Prof. Dr. V.P. Devassia, Principal, College of Engineering, Chengannur, for
providing me the best facilities and atmosphere for the development and presentation of my
seminar.
I thank Prof. V.P. Jyothiraj, Head of the Department, Department of Electronics Engineering,
for his encouragement and support.
I am indebted to Mr. Manoj Kumar P, Assistant Professor in Electronics and Communication
Engineering, Mrs. Laghima P.M, Assistant Professor in Electronics and Communication
Engineering, and Mr. Ayoob Khan T.E Associate Professor in Electronics and Communication
Engineering, for their valuable suggestion and ideas without which this seminar would have been
a tough task.
A sincere word of thanks to all my friends and family members for their support and prayers
offered which were inevitable for the successful completion of the seminar.
ABSTRACT
Light Peak is Intel's code-name for a new high-speed optical cable technology designed
to connect electronic devices to each other in a peripheral bus. Light Peak delivers high
bandwidth starting at 10Gb/s with the potential ability to scale to 100Gb/s over the next
decade.At 10Gb/s, you could transfer a full-length Blu-Ray movie in less than 30 seconds.
It is intended as a single universal replacement for current buses such as SCSI, SATA,
USB, FireWire, PCI Express and HDMI. In comparison to these buses, Light Peak is much
faster, longer ranged, smaller, and more flexible in terms of protocol support. Light Peak also has
the ability to run multiple protocols simultaneously over a single cable, enabling the technology
to connect devices such as peripherals, displays, disk drives, docking stations, and more.
Light peak was developed by Intel and brought to market with technical collaboration
from Apple Inc. In late February 2011, Apple introduced its Mac Book Pro laptop computers
with light peak technology and announced its commercial name as Thunderbolt. It can be added
to existing products with relative ease.
CONTENTS
1. INTRODUCTION ……………………………………………….…………………..1
2. LIGHT PEAK TECHNOLOGY ………………………………...……………….3
3. TODAYS CHALLENGES……………………………………..…………………..6
4. LIGHT PEAK V/S USB 3.0 ………………………………………….……………9
5. DATA TRANSFER SPEED COMPARISION………………….……………11
6. COMPONENT OVERVIEW...……………………………………….…………..13
6.1 Fiber Optics Cable ……………..………………….………………..…………15
6.2 Optical Module ………………………………………..………..…….………..16
6.2.1 VCSEL …………………………………….……….…….….……….16
6.2.2 Optical Modulator ………………………………….…...…………..17
6.3 Controller Chip ………………………………………….…………….……....19
7. LIGHT PEAK TECHNOLOGY OVERVIEW .………...…….….…………20
7.1 Light Peak Protocol Architecture ...….………….…….…….………………..21
8. ADVANTAGE……………………………………….………….…………..………..23
9. CONCLUSION…………………………………………………..………….…….…25
10. REFERENCES………………………………….…………….…….…..……….....28
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1. INTRODUCTION
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1. INTRODUCTION
The present era is the era of connectivity. Think of any sort of information, and it can be
transferred to us within question of a little time; be it audio information, video information or
any other form of data.
Now talking about transferring data between our computer and the other peripherals, the
first and foremost standard comes to our mind is Universal Serial Bus (USB). It is a medium
speed serial data addressable bus system which carry large amount of data to a relatively short
distance (up to 5m).The present version USB 3.0 promises to provide theoretical speed of up to
5Gbps.
But Intel has unveiled a new interoperable standard called LIGHT PEAK which can
transfer data between computers and the peripherals at the speed of 10Gbps in both the directions
with maximum range of 100m (much higher than USB or any other standard) and has potential
to scale its speed high up to 100Gbps in near future.
Light Peak is the code name for a new high-speed optical cable technology designed to
connect electronic devices to each other.
Light Peak is basically an optical cable interface designed to connect devices in peripheral
bus. It is being developed as a single universal replacement for the current buses such as SCSI,
SATA, USB, FireWire, PCI Express, and HDMI etc in an attempt to reduce the proliferation of
ports on computers.
Fiber-optic cabling is not new, but Intel executives believe Light Peak will make it cheap
enough and small enough to be incorporated into consumer electronics at a price point that
consumers and manufacturers will accept.
Thus with light peak, the bandwidth would tremendously increase, multiple protocols could
be run over single longer and thinner cable.
The prototype system featured two motherboard controllers that both supported two
bidirectional buses at the same time, wired to four external connectors. Each pair of optical
cables from the controllers is led to a connector, where power is added through separate wiring.
The physical connector used on the prototype system looks similar to the existing USB or
FireWire connectors.
Intel has stated that Light Peak has the performance to drive everything from storage to
displays to networking, and it can maintain those speeds over 100 meter runs.
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2. LIGHT PEAK TECHNOLOGY
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2. LIGHT PEAK TECHNOLOGY
Optical networking technologies have been over the last two decades reshaping the entire
telecom infrastructure networks around the world and as network bandwidth requirements
increase, optical communication and networking technologies have been moving from their
telecom origin into the enterprise and Light Peak is one of its successful outcome.
It is basically a new high-speed optical cable technology designed to connect electronic
devices to each other .It also support multiple protocols simultaneously with the bidirectional
speed of about 10Gbps (can scale up to about 100Gbps). In comparison to other bus standards
like SATA and HDMI, it is much faster, smaller, longer ranged, and more flexible in terms of
protocol support.
Thus it basically provides a standard low cost high bandwidth optical-based interconnect, it
supports multiple existing I/O protocols and smooth transition between them, it supports wide
range of devices (handhelds, PCs, workstations etc.) ,connect to many devices with the same
cable, or to combo devices, have smaller connectors and longer (up to 100m on single cable),
thinner and economical.
Light peak consist of a controller chip and optical module that would be included in
platform to support this technology. The optical module performs the task of conversion of
electricity to light conversion and vice versa, using miniature lasers and photo detectors. This
transceiver can send two channels of information over an optical cable, necessary, since pc needs
at least two ports. The controller chip provides protocol switching to support multiple protocols
over single cable.
The Light Peak cable contains a pair of optical fibers that are used for upstream and
downstream traffic to provide speed of about 10Gbps in both the directions and power is added
through separate wiring.
It was developed as a way to reduce proliferation of number of ports on the modern
computer. Earlier USB was developed for the same purpose and performed very well in this
direction but increased bandwidth demand and high performance has led to development of new
more efficient technologies.
Combining the high bandwidth of optical fiber with Intel’s practice to multiplex multiple
protocols over a single fiber, optical technology may change the landscape of IO system design
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in the future. It’s possible that most of the legacy IO protocols can be tunneled by optical capable
protocols, so some of the legacy IO interfaces can be converged to one single optical interface,
significantly simplifying the form factor design of computers. This change in IO system will
definitely affect the design of systems.
Fig. 2.1 Abstract model of the optical-enabled system
There are four main components in this figure, the IO devices, the IO controller which
connects to the IO devices through optical fiber, the processing unit and the interconnection
between the IO controller and the processing unit, whatever it can be implemented as.
Mobile and handheld devices are two fast growing market segments which attract interests
from processor vendors. For mobile and handheld devices, user interface and IO are two
important factors besides computing power that affect end users purchase decision .Taking
power into account, it’s possible that more carefully tuned IO workload offloading engines will
be integrated into the IO controller, saving the power to move the data from IO a long way to the
system memory. It makes no sense to have a high throughput IO system with insufficient
processing power or overloaded interconnections between IO system and the processor. The
ultimate goal of system architects is to make a balanced and efficient system, on both power and
cost grounds
.
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3. TODAYS CHALLENGES
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3. TODAYS CHALLENGES
In the coming future, people would be using more and more electrical devices such as HD
devices, MIDs and many more and user experience would depend on the huge volume of data
capturing, transfer, storage, and reconstruction. But existing electrical cable technology is
approaching the practical limit for higher bandwidth and longer distance, due to the signal
degradation caused by electro-magnetic interference (EMI) and signal integrity issues. Higher
bandwidth can be achieved by sending the signals down with more wires, but apparently this
approach increases cost, power and difficulty of PCB layout, which explains why serial links
such as SATA, SAS, and USB are becoming the mainstream. However optical communications
do not create EMI by using photonics rather than electrons, thus allowing higher bandwidth and
longer distances. Besides, optical technology also allows for small form factors and longer,
thinner cables.
The USB connectors on the smaller devices like mobile phones have to use mini-USB or
micro-USB to save on the space taken up by the wiring and electricity through wire creates
electric field interference, but light do not create EMI since it rely over photonics. Optical
connecters can carry extremely narrow beams of light and fiber can be thinner because more
streams can pass through glass or plastic passages. Each fiber is only 125 microns wide, the
width of a human hair.
In the present scenario, the devices are getting smaller, thinner, and lighter but present
connecting standards seems to hinder in their performance being to thicker and stiffer. So
vendors turn over to new technologies providing much better performance and Light Peak seems
to be a providing a good solution.
Different protocols demands for different connectors leading to too many connectors and
cables. But in Light Peak there is the Light Peak protocol and the native protocols such as PCI
Express, Display Port, USB or whatever might be running on it. The native protocols run
basically on top of the Light Peak protocol. But the Light Peak protocol defines the speed. The
protocol is running at 10 gigabits per second. So, if the native protocols that are running on top
of it are also running at 10 gigabits per second, or something close to that, then the effective
bandwidth for a device on the other end would be equivalent to that 10Gbps.
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Fig 3.1 Different interconnects
Thus, it can be said that presently we demand for the devices and technologies that provides
much higher bandwidth , more flexible designs, thinner form factor and new and better usage
models and much simpler and easier in terms of connectivity’s.
It’s possible that most of the legacy IO protocols can be tunneled by optical-capable
protocols, so some of the legacy IO interfaces can be converged to one single optical interface,
significantly simplifying the form factor design of computers. This change in IO system will
definitely affect the design of systems. It makes no sense to have a high throughput IO system
with insufficient processing power or overloaded interconnections between IO system and the
processor. Ultimately the main aim is to build an efficient and balanced system.
Thus Light Peak seems to be providing a good solution to the problems existing with the
copper connectors and provides a good platform for the high performance system.
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4. LIGHT PEAK VS USB 3.0
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4. LIGHT PEAK V/S USB 3.0
USB 3.0
1. It is an electrical cable technology
which transmits data using electricity
which put limitation on speed and
length.
2. It consists of 9 copper wires for
transfer of data between the PC and the
peripherals.
3. Theoretically it can provide maximum
speed of 5Gbps which on practical
grounds get restricted to about 3Gbps.
4. It supports only USB protocol.
5. The maximum allowable cable length
for USB 3.0 is only about nine meters
LIGHT PEAK
1. It is an optical cable technology which
relies over light to transmit data thus
providing much better speed and
length.
2. It consists of 4 optical fibers for both
upstream and downstream traffic
simultaneously.
3. Initial proposed speed for Light Peak
(LPK) [10] starts at 10Gbps and has
future potential to scale up to
100Gbps.).
4. It is a Universal connector supporting
multiple existing protocols.
5. The maximum allowable cable length
is about 100 meters and can be even
extended more.
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5. DATA TRANSFER SPEED COMPARISON
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5. DATA TRANSFER SPEED COMPARISION
How does Light Peak compare to the latest technologies? The slowest is wireless. HDMI
version 1.3 and higher will transfer at 10.2 Gbps, while Display Port can go up to 10.8 Gbps.
These are slightly better than Light Peak, but they are mostly designed for video. No one is
pushing the data transfer rates of these protocols.
Fig 5.1 The chart shows how Light Peak compares to all of these other protocols.
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6. COMPONENT OVERVIEW
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6. COMPONENT OVERVIEW
Light Peak consists of a controller chip and an optical module that would be included in
platforms supporting this technology. The optical module performs the conversion from
electricity to light and vice versa, using miniature lasers (VCSELs) and photo detectors. Intel is
planning to supply the controller chip, and is working with other component manufacturers to
deliver all the Light Peak components.
The main components are:
1. Fiber optics cable
2. Optical module
3. Controller chip
Fig 6.1 Prototype view of components of light peak controller
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6.1 Fiber Optics Cable
The fiber used here is a silica-based optical fiber structure which consists of a cladding
layer with a lower refractive index than the fiber core it surrounds. This refractive index
difference causes a total internal reflection, which guides the propagating light through the fiber
core with an attenuation less than 20 dB/km necessary threshold to make fiber optics a viable
transmission technology.
The fiber is coated with a thin primary coating to protect the inner glass fiber from
environmental hazards. Light Peak is based on Laser-optimized Multi-mode fiber (LOMF). By
laser optimized it just means that the fiber was designed to be used with lasers, and in the case of
MMF, typically VCSELs. The internal diameter of each Light Peak fiber is 62.5 microns (around
half the size of a human hair, but thicker than the fiber used in telecoms). The beam expander
molded into the lens expands that to 700 microns, so that dusts usually around 100 microns may
interrupt the beam partially but the connection will still work. The beam expander also
compensates for distortion or movement in the connector after been used for a while. Light Peak
fiber has a 3-micron coating to prevent cracking, it can be bent to a radius of 3mm and it won't
break. It is mixed with copper wires for power and fiber optic cables for data.
Fig 6.2 Light peak optical cable
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6.2 Optical Module
The optical module does the function of converting optical signals into electrical signals
and vice versa. This module contains an array of VCSEL (vertical cavity surface emitting laser).
Fig 6.3 Schematic diagram of Optical module
This consists of:
1. VCSEL (light source)
2. Optical modulator
3. PIN diode(light detector)
6.2.1 VCSEL
VCSELs are semiconductor lasers, more specifically laser diodes with a monolithic laser
resonator, where the emitted light leaves the device in a direction perpendicular to the chip
surface. The laser resonator consists of two distributed Bragg reflector (DBR) mirrors parallel to
the wafer surface with an active region consisting of one or more quantum wells for the laser
light generation in between. The planar DBR-mirrors consist of layers with alternating high and
low refractive indices. Each layer has a thickness of a quarter of the laser wavelength in the
material, yielding intensity reflectivity above 99%.
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VCSELs has low-cost potential because the devices are completed and tested at the wafer
level for material quality and processing purposes and a matrix VCSEL is capable of delivering
high power( up to few watts).
Light Peak Technology VCSELs have low threshold current value, low temperature
sensitivity, high transmission speed, high fiber coupling efficiency and circular and low
divergence output beam as compared to edge emitters.
VCSELs for wavelengths from 650 nm to 1300 nm are typically based on gallium arsenide
(GaAs) wafers with DBRs formed from GaAs and aluminium gallium arsenide (AlxGa(1-x)As).
The current is confined in an oxide VCSEL by oxidizing the material around the aperture
of the VCSEL. As a result in the oxide VCSEL, the current path is confined by the ion implant
and the oxide aperture. The wavelength of VCSELs may be tuned, within the gain band of the
active region, by adjusting the thickness of the reflector layers.
6.2.2 Optical modulator
In optical networks, binary digital modulation is typically used, namely on (light on) and
off (no light) to transmit data. These semiconductor laser devices generate output light intensity
which is proportional to the current applied to them, therefore making them suitable for
modulation to transmit data.
Modulation schemes can be divided into two main categories: a direct and an external
modulation.
In a direct modulation scheme, modulation of the input current to the semiconductor laser
directly modulates its output optical signal since the output optical power is proportional to the
drive current.
In an external modulation scheme, the semiconductor laser is operating in a Continuous-
Wave (CW) mode at a fixed operating point. An electrical drive signal is applied to an optical
modulator, which is external to the laser. Consequently, the applied drive signal modulates the
laser output light on and off without affecting the laser operation.
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Fig 6.4 Block diagram of a typical external modulator
Typical external modulator consists of an optical splitter a material called lithium
niiabate(LiNbO3)-whose refractive index varies with the applied electric field and an optical
combiner. The input light enters the external modulator via the input fiber. The light is first splits
into two fibers using an optical splitter. The top fiber path travels through a length of LiNbO3
crystal. The light in the bottom fiber experiences a fixed delay. After the light travels through the
lithium niobate crystal and the fixed length of fiber, an optical combiner merges the two fiber
paths. The light travels through identical path legs .By applying an electric field to the material,
its refractive index changes. If the time delay through the fixed fiber and the LiNbO3 crystal is
equal, the light will be in phase when it reaches the output optical combiner. Due to the nature of
light, since the light in both legs are in phase, they will constructively add to form the maximum
possible output .The refractive index and the speed of light change as the applied voltage
changes. When the speed changes enough to delay the light by half of one wavelength, the light
will add destructively, yielding a minimum possible output
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6.3 Controller Chip
The heart of Light Peak is an Intel-designed controller chip that handles the protocols,
along with an optical module that converts electrical signals to photons and vice versa.
Basic implementation unit of Light Peak Controller contains, firstly a Cross bar switching
unit which switches the various protocols from LPK to their respective protocol adapter.
Secondly LPK Ports and Protocol Adapter ports which connect down to PC using any standard
and diverging it their respective protocol through protocol adapter.
The Host controller is typically multi protocol and has multiple ports with a software
interface unit and is optimized for host side implementation whereas the peripheral controller
could be single port and single protocol-based and is optimized for particular usage.
This is because of this controller chip that different protocols get identified and transmitted
correctly. API (Application programming interface) helps to determine the different protocols. It
places the FIS (Flag Identification Symbol) packets in the memory, the controller access these
packets from the memory and send these packets to the destination over the optical link.
The multi-protocol capability the controller implements is an innovative new technology
that will enable new usage models like flexible system designs and thinner form factors, media
creation and connectivity, faster media transfer and cable simplification.
Fig 6.5 Light peak controller schematic
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7. LIGHT PEAK TECHNOLOGY OVERVIEW
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7. LIGHT PEAK TECHNOLOGY OVERVIEW
Light Peak Technology is an optical cable technology that consists of an optical module
and controller chip which allows multiple protocols to run over the single cable. From the
technical point of view, Intel’s Light Peak Technology can be overviewed as:
1. Light peak protocol
2. Light Peak controller
3. Light peak platforms
7.1 Light peak protocol architecture
Simplified views of protocol Light Peak Networks use a similar idea of packet switching.
Light peak technology uses packet switch multiplexing for packetize data to transfer, multiplex it
onto the wire and to allow packets from different connections share the same link.
Each packet is composed by the payload (the data we want to transmit) and a header. The
header contains information useful for transmission, such as:
1. Source (sender’s) address
2. Destination (recipient’s) address
3. Packet size
4. Sequence number
5. Error checking information
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Fig 7.1 Simplified view of protocol
.
All the IO devices may have their native protocols but when using Light Peak they all run
over Light Peak protocol. That is they uses their individual protocol for data transfer but their
speed is defined by light peak.
Also it uses Virtual Wire Semantics thus performs high level of isolation between
high level protocols (QoS).
It provides cheap switching and establishes all routing at the setup only.
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8. ADVANTAGE
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8. ADVANTAGES
The light peak optical modules are physically much smaller than those of telecom grade.
The optical modules are designed to be much lower cost and higher performance. Light Peak can
send and receive data at 10 billion bits per second. The thin optical fiber will enable Light
Peak to transfer data over very thin, flexible cables. Unlike electrical cables, Light Peak do
not faces the problem of EMI, thus can be used up to 100m.Light Peak also has the ability to
run multiple protocols simultaneously over a single cable, enabling the technology to connect
devices such as docking stations, displays, disk drives, and more. The data transfer is
bidirectional in nature thus enabling devices to transfer simultaneously.
Quality of service implementation . No Operating System (OS) changes required. It also
supports another feature known as ³Hot-swapping´ which means the PC needs not be shut down
and restarted to attach or remove a peripheral.
Economies of scale from a single optical solution. Enables I/O performance for the next
generation Allows for balanced platform, with external I/O keeping up with most platform
inter connects.
Up to 100 meters on an optical-only cable. Each fiber is only 125 microns wide,
the width of a human hair. Supports multiple existing I/O protocols over a single cable and
smooth transition for today’s existing electrical I/O protocols. Can connect to more devices
with the same cable, or to combo devices such as docking stations.
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9. CONCLUSION
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9. CONCLUSION
Light Peak is a high-speed, multi-protocol interconnect for innovative and emerging client
usage models, that complements other existing interconnects
Light Peak is the name for a new high-speed optical cable technology designed to connect
electronic devices to each other. Light Peak delivers high bandwidth starting at 10Gb/s with the
potential ability to scale to 100Gb/s over the next decade. At 10Gb/s, we can transfer a full-
length Blu-Ray movie in less than 30 seconds. Light peak allows for smaller connectors and
longer, thinner, and more flexible cables than currently possible. Light Peak also has the ability
to run multiple protocols simultaneously over a single cable, enabling the technology to connect
devices such as peripherals, displays, disk drives, docking stations, and more.
Intel is working with the optical component manufacturers to make Light Peak components
ready to ship in this year, and will work with the industry to determine the best way to make this
new technology a standard to accelerate its adoption on a plethora of devices including PCs,
handheld devices, workstations, consumer electronic devices and more. Light Peak is
complementary to existing I/O technologies, as it enables them to run together on a single cable
at higher speeds.
At the present time, Intel has conducted three successful public demonstrations of the Light
Peak technology and confirmed that the first Light Peak-enabled PCs should begin shipping
soon.
The goal of this new developing technology is to build a high-bandwidth, fault-resilient,
low-cost network that can deliver performance isolation across applications. The basic approach
to achieve this target is to integrate low-radix switches into server platform and interconnect
severs directly using multipath topologies. Thus if the question WHY LIGHT PEAK?? arises,
then the answer would be because it is cheaper as it incorporates cheaper switching components,
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provide better bandwidth allocation and performance isolation, uses flexible topologies, integrate
multiple protocol devices on to one cable.
Intel CEO Paul Otellini called Light Peak the I/O performance and connection for the next
generation,´ and confirmed that both Nokia and Sony have publicly announced their support.
Victor Krutul, director of Intel’s optical development team and founder of the Light Peak
program, is even more effusive, calling Light Peak ³the biggest thing to happen to the optical
industry ever, or at least since the creation of the laser.´
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10. REFERENCES
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10. REFERENCES
[1] Sreenivas Addagatla, Mark Shaw, Suyash Sinha and Prashant Chandra, Ameya S.Varde,
Michael Grinkrug , “Direct Network Prototype Leveraging Light Peak Technology” , 18th
IEEE Symposium on High Performance Interconnects,2010
[2] Jason Ziller and Victor Krutul , “A New Optical Technology-Light Peak” Intel
Technology Journal, Volume 8
[3] Wooten, E. L., “A Review of Lithium Niobate Modulators for Fiber-Optic
Communications Systems”
[4] http:// en.wikipedia.org/wiki/Light_Peak
[5] http://en.wikipedia.org/wiki/Light_Peak
[6] http://news.cnet.com/8301-13924_3- 20025559-64.html
[7] http://www.lightpeakinfo.com
[8] http://www.technewsworld.com/story/68231.html
[9] http://optics.or g/indepth/1/3/6
[10] http://arstechnica.com/apple/news/2009/09/apple- inspiration-behind- light-peak-optical-
[11] http://www.lightwaveonline.com/about-us/lightwave-current-issue/Intel-plots-Light-
[12] http://Peak- interconnect-revolution.html