Light Reading

All-Optical Switching Tutorial, Part 1

Light Reading
10/24/2001
50%
50%

This is the first of a pair of technology tutorials on all-optical switching by Geoff Bennett, vice president of technology advocacy at Marconi PLC (Nasdaq/London: MONI).

This tutorial covers the all-optical switches themselves – the various types, how they differ from electronic switches, where they sit in networks, what functions they perform, how they're controlled, and what they can and can't do.

The second tutorial covers optical switching fabric. In particular, it shows how different sizes and types of switch require different methods of routing light through their cores.

Both of these tutorials are based on a presentation given by Bennett at Opticon 2001, Light Reading's annual conference held in San Jose, Calif., in August of this year. Bennett would like to acknowledge the help of Peter Duthie, senior technical specialist, Marconi Optical Components, in preparing this presentation.

As a rule, Light Reading doesn't accept editorial contributions from manufacturers, but Bennett's tutorials provide valuable vendor-neutral insight into issues that have often been muddied by marketing hype.

In Bennett's view, the key to understanding all-optical switches is to consider the following issues in order:

Applications Identifying the purpose of an all-optical switch pinpoints key requirements in terms of scale, functions, and performance.

Techniques This covers how traffic is directed through the switch (the control plane) and the way in which it's handled (on its own dedicated wavelength or multiplexed with other traffic).

Technologies Dealt with in the second tutorial, this covers the fabric that routes optical pulses from input ports to output ports.

Here's a hyperlinked summary of this report:

Page 2: Basics

  • How optical and electronic switches work
  • Optical > analog > strange Page 3: OEO vs OOO

  • Why OEO is nothing new
  • How some optical cores have OEO add-ons Page 4: GMPLS Context

  • New taxonomy
  • Latest MPLS lingo Page 5: Applications

  • What switch goes where
  • Lambda, burst, and packet switching Page 6: Really Difficult Things

  • Reading at extreme speeds
  • Buffering optical packets Page 7: Lambda Switching

  • Manual versus automatic
  • Why "dynamic" is different Page 8: Optical Burst Switching

  • How it works
  • Lambda versus burst switching Page 9: Optical Packet Switching

  • An impossible dream?
  • Researchers push the limits Introduction by Peter Heywood, Founding Editor, Light Reading
    http://www.lightreading.com Next Page: Basics

    (42)  | 
    Comment  | 
    Print  | 
  • Newest First  |  Oldest First  |  Threaded View        ADD A COMMENT
    Page 1 / 5   >   >>
    hspattanaik
    50%
    50%
    hspattanaik,
    User Rank: Light Beer
    12/5/2012 | 4:24:40 PM
    re: All-Optical Switching Tutorial, Part 1


    Hi,


    Is it possible to put the images in the tutorials by Geoff Bennett in "Light Readings" annual conference held in San Jose 2001.


    It is kind of difficult to learn without the images.


    It would be great help


    Thank you


    Himansu


    hspattanaik@gmail.com  

    perfume78
    50%
    50%
    perfume78,
    User Rank: Light Beer
    12/5/2012 | 1:20:38 AM
    re: All-Optical Switching Tutorial, Part 1
    Dear all,

    One problem in OBS is that it is very hard to do traffic engineering. I am very curious about the routing issues in OBS. Will it provide a single path for each source destination pair and update the routing table periodically, or provide multiple path candidates in the routing table?

    Other comments on OBS and wavelength routing are as follows:

    1. OBS is said to be better than the wavelength routing because it is able to multiplexing the data, thus more efficiently utilising the bandwidth. However, OBS is very bad at dealling with the blocking, whilst wavelength routing can provide guaranteed service upto a certain level.

    2. Therefore, it is very hard to say which is better actually. Current network status shows that there are far more sufficient network resources in the backbone. So it seems that bandwidth efficiency is not the biggest concern. From this point of view, dynamic wavelength routing seems more adoptable.


    smurtaza
    50%
    50%
    smurtaza,
    User Rank: Light Beer
    12/5/2012 | 1:03:24 AM
    re: All-Optical Switching Tutorial, Part 1
    Dear Sir/Madam,

    Can we practically, think about an Optical Hybrid Switch which may contain "OBS" for short lived traffic or called best effort traffic and "OCS" for long-lived traffic or video conferencing etc.

    If we give strict priority to OCS traffic and equal priority to OCS traffic what could be possible discussions?

    Thanks,
    faiq_mehtab@yahoo.com
    benjamin_lui
    50%
    50%
    benjamin_lui,
    User Rank: Light Beer
    12/4/2012 | 11:39:40 PM
    re: All-Optical Switching Tutorial, Part 1
    All-optical swtiching really can break the bottlenecks of the speed of transmission, but I would like to know how the header can be processed optcally. (Through optical Logic gate with syncronization processes?) - I just start working on this topic, and would like to learn more - thank you
    benjamin_lui
    50%
    50%
    benjamin_lui,
    User Rank: Light Beer
    12/4/2012 | 11:38:20 PM
    re: All-Optical Switching Tutorial, Part 1
    Really hope that, someone would help~

    I am wonder that the header is still processed in the electronic domain. And so the processing time is still slow. Also OE-conversion is still needed in this processing.

    So, does OPS need OE-conversion?
    or my concept is not correct?

    --------------------
    Thank you very much
    Benjamin
    jobinthomas
    50%
    50%
    jobinthomas,
    User Rank: Light Beer
    12/4/2012 | 11:29:12 PM
    re: All-Optical Switching Tutorial, Part 1



    I want to know about current optical switching methods and MEMS method of optical switching.

    Please E mail the details of it.

    Owke
    50%
    50%
    Owke,
    User Rank: Light Beer
    12/4/2012 | 11:06:28 PM
    re: All-Optical Switching Tutorial, Part 1
    jhony_b_good,

    As far as I know its really a research topic atm.

    The technique is quite new (1997), so there's still a lot of work to be done at the basis.

    Currently I only know of one 1 research project, which just started, that may apply obs to run over a fully optical router.

    For a starting point you might try :
    "http://www.ind.uni-stuttgart.d..."

    Can you tell me what work alcatel is doing on the topic (if any ?)

    happy new year,

    Owke
    gbennett
    50%
    50%
    gbennett,
    User Rank: Light Beer
    12/4/2012 | 11:04:14 PM
    re: All-Optical Switching Tutorial, Part 1
    At one time Alcatel were working on an SOA-based, broadcast & select switch.

    SOAs are quite a fast way to gate a B&S design, probably fast enough for OPS.

    There are some interesting drawbacks to using SOAs, however. These include both a significant noise component, and the fact that you introduce a polarisation dependency (which adds a few network design challenges).

    I'm planning an update to the article now and will include a more detailed description of broadcast and select (or gate), with both SOA and EDFA gating described.

    Cheers,
    Geoff
    laphroaig
    50%
    50%
    laphroaig,
    User Rank: Light Beer
    12/4/2012 | 10:21:18 PM
    re: All-Optical Switching Tutorial, Part 1
    KEOPS is undoubtedly the fore father in optical packet switch research and tonnes of research papers published after it. But with ATM diminishing and IP become the dominant player, there is really no point talking about KEOPS, WASPNET, ... what we need is an optical packet switch for IP packets.

    The problem with switching IP packets is that the packet size distribution is highly dynamic at any instant of time. TO buffer these packets, you will need the same dynamic mechanism in the buffers. And this is exactly the weak point of optics, the buffers are build up of dumb static optical delay line where the next buffer is fixed step increase of the previous buffer. In short we have a highly random packet size distribution at the input and a dumb buffer.

    What we need is what we don't have, repeating the facts stated in previous posted messages,there are no intelligence and no dynamic buffers. Unlesss there is breakthrough in this area, there's no ground breaking solution.
    45rpm
    50%
    50%
    45rpm,
    User Rank: Light Beer
    12/4/2012 | 7:40:27 PM
    re: All-Optical Switching Tutorial, Part 1
    A1: For a connectionless OPS network, we send the packet header in-band with the data, but at a lower bit rate than the data.

    Is this concept similar to TDM rob-bit signaling?
    Page 1 / 5   >   >>
    Flash Poll
    From The Founder
    Last week I dropped in on "Hotlanta," Georgia to moderate Light Reading's inaugural DroneComm conference – a unique colloquium investigating the potential for drone communications to disrupt the world's telecom ecosystem. As you will see, it was a day of exploration and epiphany...
    LRTV Documentaries
    Verizon's Emmons: SDN Key to Cost-Effective Scaling

    5|22|15   |   03:53   |   (0) comments


    For Verizon and other network operators to ramp up available bandwidth cost effectively, they need to move to SDN and agree on how to do that.
    LRTV Documentaries
    Lack of Universal SDN a Challenge

    5|21|15   |   04:51   |   (3) comments


    Heavy Reading Analyst Sterling Perrin talks about how uncertainty about SDN standards and approaches may be slowing deployment.
    LRTV Custom TV
    Steve Vogelsang Interview: Carrier SDN

    5|20|15   |   05:02   |   (0) comments


    Sterling Perrin speaks to Steve Vogelsang, Alcatel-Lucent CTO for IP Routing & Transport business, about the new Carrier SDN-enabling Network Services Platform and the operator challenges it solves.
    LRTV Custom TV
    Carrier SDN: On-Demand Networks for an On-Demand World

    5|20|15   |   20:52   |   (0) comments


    Steve Vogelsang, Alcatel-Lucent CTO for IP Routing & Transport business, talks about requirements and benefits of Carrier SDN during the keynote address at the Light Reading Carrier SDN event May 2015.
    LRTV Documentaries
    The Security Challenge of SDN

    5|19|15   |   02:52   |   (0) comments


    CenturyLink VP James Feger discusses concerns that virtualization could create new vulnerabilities unless network operators build in safeguards.
    LRTV Custom TV
    NFV Elasticity – Highly Available VNF Scale-Out Architectures for the Mobile Edge

    5|18|15   |   5:50   |   (0) comments


    Peter Marek and Paul Stevens from Advantech Networks and Communications Group talk about their NFV Elasticity initiative and the company's latest platforms for deploying virtual network functions at the edge of the network. Packetarium XL and the new Versatile Server Module: 'designed to reach parts of the network that other servers cannot reach.'
    LRTV Huawei Video Resource Center
    Bay Area Spark Meetup 2015

    5|14|15   |   3:54   |   (0) comments


    Developed in 2009, Apache Spark is a powerful open source processing engine built around speed, ease of use and sophisticated analytics. This spring, Huawei hosted a meetup for Spark developers and data scientists in Santa Clara, California. Light Reading spoke with organizers and attendees about Huawei's code contributions and long-term commitment to Spark.
    LRTV Custom TV
    The Transport SDN Buzz

    5|12|15   |   06:01   |   (1) comment


    Sterling Perrin, senior analyst at Heavy Reading, speaks with Peter Ashwood-Smith of Huawei and Guru Parulkar of ON.Lab about the evolution of transport SDN and the integration of technologies.
    LRTV Custom TV
    Next-Generation CCAP: Cisco cBR-8 Evolved CCAP

    5|5|15   |   04:49   |   (0) comments


    John Chapman, Cisco's CTO of Cable Access Business Unit and Cisco Fellow, explained the innovation design of Cisco's cBR-8, the industry's first Evolved CCAP, including DOCSIS 3.1 design from ground-up, distributed CCAP with Remote PHY and path to virtualization. Cisco's cBR-8 Evolved CCAP is the platform that will last through the transitions.
    LRTV Custom TV
    Meeting the Demands of Bandwidth & Service Group Growth

    5|1|15   |   5:35   |   (0) comments


    Jorge Salinger, Comcast's Vice President of Access Architecture, explains how DOCSIS 3.1 and multi-service CCAP can meet the demands of the bandwidth and service group growth.
    LRTV Custom TV
    DOCSIS 3.1: Transforming Cable From Hardware-Defined Network to Software-Defined Network

    4|29|15   |   03:48   |   (0) comments


    John Chapman, Cisco's CTO of Cable Access Business Unit and Cisco Fellow, explains how DOCSIS 3.1 can transform cable HFC network to a more agile software-defined network.
    LRTV Huawei Video Resource Center
    Predicting Traffic Patterns for Quality Mobile Broadband

    4|29|15   |   6:45   |   (0) comments


    Accessing information ubiquitously creates complexity and creates heavy traffic onto the network, especially at large-scale events like sporting events or festivals. In this video, Huawei's Mohammad Hussain speaks to experts about how to predict traffic and improve user experience during periods of heavy traffic.
    Upcoming Live Events
    June 8, 2015, Chicago, IL
    June 9, 2015, Chicago, IL
    June 9-10, 2015, Chicago, IL
    June 10, 2015, Chicago, IL
    September 29-30, 2015, The Westin Grand Müchen, Munich, Germany
    October 6, 2015, The Westin Peachtree Plaza, Atlanta, GA
    October 6, 2015, Westin Peachtree Plaza, Atlanta, GA
    All Upcoming Live Events
    Infographics
    Network functions virtualization (NFV) is not the easiest of topics to take on board, so here's a Light Reading infographic, developed following conversations with the folks at HP, that helps make sense of where NFV is taking the industry.
    Hot Topics
    10 Alternate Uses for Tablets
    Eryn Leavens, Copy Desk Editor, 5/22/2015
    Verizon Saves 60% Swapping Copper for Fiber
    Sarah Thomas, Editorial Operations Director, 5/19/2015
    Bidding War for TWC Looks Likelier
    Alan Breznick, Cable/Video Practice Leader, 5/22/2015
    Chattanooga Charts Killer Gigabit Apps
    Mari Silbey, Senior Editor, Cable/Video, 5/20/2015
    Comcast Targets 6 New Gigabit Markets
    Mari Silbey, Senior Editor, Cable/Video, 5/21/2015
    Like Us on Facebook
    Twitter Feed
    Webinar Archive
    BETWEEN THE CEOs - Executive Interviews
    With 200 customers in 60 countries, Stockholm-based Net Insight has carved out a solid leadership position in one of the hottest vertical markets going in comms right now: helping service providers and broadcasters deliver video and other multimedia traffic over IP networks. How has Net Insight managed to achieve this success in the face of immense competition from the industry giants?
    My ongoing interview tour of the leading minds of the telecom industry recently took me to Richardson, Texas, where I met with Rod Naphan, CTO and SVP, Solutions, ...
    I recently popped down to Texas to chat with CEO Eric L. Pratt about his company, Taqua.
    Cats with Phones