& cplSiteName &

Wavelength Selective Switch (WSS)

Craig Matsumoto
The Buzz Bin
Craig Matsumoto
8/30/2010
50%
50%

The switching element inside a Reconfigurable Optical Add-Drop Multiplexer (ROADM).

A WSS typically comes in a 1xN format, with one fiber going in and going out. One of the outgoing fibers is an express lane, for the DWDM wavelengths that aren't being added or dropped by this particular ROADM. The remaining fibers can be used to add or drop wavelengths -- so, a 1x9 WSS creates a ROADM that can add or drop 8 wavelengths.

Vendors are starting work on 1x23 WSSs, but the most commonly used types are still the small ones, as small as 1x2.

WSSs are available with 100GHz and 50GHz ITU grid spacing, and some components vendors say they can also go "gridless," using software to assign wavelengths that aren't confined to one ITU grid assignment. (See OFC/NFOEC: For ROADMs, Less Is More.) JDSU and Finisar design their own WSSs. A handful of startups also deliver WSSs, including Capella Photonics Inc. , CoAdna Photonics Inc. , and Nistica .

(1)  | 
Comment  | 
Print  | 
Newest First  |  Oldest First  |  Threaded View        ADD A COMMENT
phizaleo
50%
50%
phizaleo,
User Rank: Light Beer
12/5/2012 | 4:24:40 PM
re: Wavelength Selective Switch (WSS)


Craig, thanks for the note, i'm a fan.


The statement


"so, a 1x9 WSS creates a ROADM that can add or drop 8 wavelengths."  isn't 100% correct.  the 1x9 WSS makes this ROADM an 8 Degree ROADM.  Each degree/direction/fiber pair typically has several wavelengths (ie 80 or 88 in a 50Ghz spaced system or half that in a typical 100Ghz spaced system).  So a 1x9 WSS may be carrying 704 wavelengths.  My understanding is that the 1x23 WSS like we saw in action at OFC will be primarily used in colorless/directionless applications.



Phiz

From The Founder
Download our complete guide to de-risking NFV deployment in 2016, including:
  • An eight-step strategy to deploying NFV safely, based on input from the companies that have already started virtualizing their production networks.
  • Interviews with leading executives at Colt, AT&T, Deutsche Telekom, Cisco, Nokia, ZTE, Ericsson and Heavy Reading.
  • Flash Poll
    Live Streaming Video
    Prepping for the Future: Upskill U Explained
    During this short kick-off video, Doug Webster, Vice President of Service Provider Marketing, Cisco, and Light Reading’s CEO & Founder Steve Saunders give an overview of Upskill U.
    LRTV Interviews
    Courting the Apartment Crowd

    5|6|16   |     |   (0) comments


    In this LRTV interview, AT&T's Adrian Cardwell details the changing dynamics of the MDU markets and explains how AT&T is pursuing apartment dwellers with GigaPower.
    LRTV Interviews
    Demand Surges for On-Demand Ads

    5|5|16   |     |   (0) comments


    Ed Knudson, VP, Product and Strategy at Canoe Ventures, discusses the rising appeal of VoD ads and the challenges on inserting ads dynamically in live TV programming.
    LRTV Custom TV
    Exclusive: Video Interview With Sckipio CEO David Baum

    5|5|16   |     |   (0) comments


    At his headquarters in Tel Aviv, G.fast visionary David Baum, CEO of Sckipio, provided an exclusive interview to Light Reading and showed how innovations in rate and reach, vector densities, fast reconnecting times and SFP-based residential gateways are expanding the potential of G.fast.
    Telecom Innovators Video Showcase
    Atrinet's NetACE – Migration to NFV & SDN With NetOps-Driven LSO

    5|4|16   |     |   (1) comment


    At Atrinet's headquarters, Ray Le Maistre sits down with Roy Silon to get an in-depth look into the company's focus and the secret recipe for their success.
    LRTV Huawei Video Resource Center
    Amsterdam ArenA, Powered by Huawei

    5|4|16   |     |   (0) comments


    Huawei's ICT solutions power the state-of-the-art Amsterdam ArenA, turning it into a smart stadium.
    LRTV Interviews
    Testing When There's No 'There' There

    5|4|16   |     |   (1) comment


    The benefits of SDN/NFV are well known, but the transition comes with some challenges, prominent among them is: how do you test a network that has been abstracted and has the potential to be endlessly reconfigurable? Light Reading was at NFV World Congress in Santa Clara, Calif., where we bumped into Mats Nordlund, CEO and co-founder of Netrounds, a Swedish ...
    LRTV Interviews
    Ditching the Slash & the Orchestration Wars

    5|3|16   |     |   (2) comments


    SDN and NFV have been inextricably bound with each other for so long that on a conceptual level, smooshing them together into one catch-all phrase – SDNFV – is now justifiable, according to Dan Pitt, executive director of the Open Networking Foundation (ONF). Light Reading spoke to Pitt at the NFV World Congress, where he explained that the next ...
    LRTV Custom TV
    ZTE TV Connect Highlights

    5|3|16   |     |   (0) comments


    ZTE gives us a tour of its booth and new products at TV Connect in London.
    LRTV Custom TV
    Deluxe's Unified Delivery Solution

    5|3|16   |     |   (0) comments


    Join Alan Breznick of Light Reading and visit the Deluxe booth at NAB! Here you'll find Deluxe's Unified Delivery Solution, OTT video, virtual reality, HDR, 4K and much more!
    LRTV Interviews
    Verizon Puts Gray Boxes in the Shade

    5|2|16   |   04:33   |   (1) comment


    When it comes to the white box trend, "gray" boxes, which have a slight proprietary twist, don't give service providers and end users the advantages they're seeking, according to Verizon's Vice President of Product and New Business Innovation Shawn Hakl.
    LRTV Custom TV
    Dealing With a Disrupted Video Market

    5|2|16   |     |   (0) comments


    Ericsson's Simon Frost discusses how traditional pay-TV providers can cope with the big changes wrought by the rise of OTT video and IP technology.
    LRTV Custom TV
    The VNF Responsibility of Red Hat

    5|2|16   |     |   (0) comments


    At MWC, Caroline Chappell of Heavy Reading visits the Red Hat booth and sits down with Chris Wright to talk about the responsibility the VNF needs to take on in order to ensure the operators get the carrier-grade performance they expect for their network.
    Upcoming Live Events
    May 23, 2016, Austin, TX
    May 23, 2016, Austin Convention Center
    May 24-25, 2016, Austin Convention Center, Austin, TX
    September 13-14, 2016, The Curtis Hotel, Denver, CO
    December 6-8, 2016,
    June 16-18, 2017, Austin Convention Center, Austin, TX
    All Upcoming Live Events
    Infographics
    A new survey conducted by Heavy Reading and TM Forum shows that CSPs around the world see the move to digital operations as a necessary part of their overall virtualization strategies.
    Hot Topics
    WiCipedia: Woman Cards & Bitch Switches
    Sarah Thomas, Director, Women in Comms, 4/29/2016
    Sprint CEO: Our Spectrum Is for 5G
    Dan Jones, Mobile Editor, 5/3/2016
    Amazon & Other 'Big 4' Cloud Providers Crushing Competitors
    Mitch Wagner, West Coast Bureau Chief, Light Reading, 4/29/2016
    Rovi Reels in TiVo for $1.1B
    Mari Silbey, Senior Editor, Cable/Video, 4/29/2016
    Showdown at the OpenStack Corral
    Carol Wilson, Editor-at-large, 5/3/2016
    Like Us on Facebook
    Twitter Feed
    BETWEEN THE CEOs - Executive Interviews
    In this latest installment of the CEO Chat series, Craig Labovitz, co-founder and CEO of Deepfield, sits down with Light Reading's Steve Saunders in Light Reading's New York City office to discuss how Deepfield fits in with the big data trend and more.
    Grant van Rooyen, president and CEO of Cologix, sits down with Steve Saunders, founder and CEO of Light Reading, in the vendor's New Jersey facility to offer an inside look at the company's success story and discuss the importance of security in the telecom industry.
    Animals with Phones
    Sloth Mail Click Here
    Sloth mail -- somehow even slower than snail mail.
    Live Digital Audio

    Of all the tech companies in the Valley, Intel has made the most aggressive commitment to building a diverse and inclusive workplace culture. It's doing so by taking concrete, measurable steps, making a large financial investment and through a commitment to complete transparency about its progress. In this radio show, WiC Director Sarah Thomas will be joined by Shlomit Weiss, Intel's Vice President, Data Center Group, and General Manager of Networking Engineering, who will share with us why Intel is tackling this huge challenge, how and to what effect. She will also discuss her unique experiences leading development of Client SOC development in the past and today leading development of all of the chipmaker's silicon hardware for networking IPs and discrete devices and managing a team of 600 engineers across Israel, Europe and the US.