& cplSiteName &

Reconfigurable Optical Add/Drop Multiplexer (ROADM)

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

An all-optical switching element for adding wavelengths to (and dropping them from) a DWDM stream.

The ROADM provides a way to do this in the optical domain, without having to terminate the traffic. More significantly, ROADMs gave carriers a way to nail up these wavelengths by only making changes at the endpoints. Previously, adding a wavelength meant manually configuring every node the wavelength was going to pass through.

ROADMs have room for improvement. For example, the configuration at those endpoints still has to be done manually. But they've become an integral part of the optical network.

ROADMs are deployed as modules -- cards slotted into optical transport equipment. They've become elemental to packet-optical transport systems (P-OTS). (See Optical's Packet Magic.) Sam Lisle of Fujitsu Network Communications Inc. explains as much in this 2008 video.



Size
The heart of a ROADM is a Wavelength Selective Switch (WSS). WSSs are commonly available in sizes up to 1x9 -- capable of adding or dropping eight wavelengths. (The ninth is the "express lane" fiber that goes straight out of the ROADM, for traffic that doesn't need to be terminated at that node.)

The next large step could be a 1x23 WSS, which some companies began showing in 2010. (See ROADMs Get Sized Up and OFC/NFOEC: ROADM Roundup.)

This JDSU (Nasdaq: JDSU; Toronto: JDU) custom video from early 2010 notes the size trends in ROADMs -- and the possibility of going colorless and directionless, which we'll outline next.



Colorless, directionless, contentionless, gridless
Vendors would like ROADMs to be more automated. As Glenn Wellbrock of Verizon Communications Inc. (NYSE: VZ) put it in May 2010, an ideal feature would be a big "defrag" button that resets the network to its optimal state. (See Verizon: Give Us More Flexible ROADMs for 100G.)

Here's what they're asking for:

  • Colorless: Able to send any wavelength to any port, and to change these assignments automatically.

  • Directionless: Allowing output ports to send traffic in any direction.

  • Contentionless: Allowing one ROADM port to use a wavelength that got dropped by another port. This could be accomplished with an NxN switching element. Large all-optical switches, of sizes up to 768x768, could also play a role here. (See OFC/NFOEC 2009 Preview and Calient Gets Ambitious With Optical Switching.)

  • Gridless: Some carriers think they'll want ROADM to assign wavelengths off of the International Telecommunication Union (ITU) grid. When Terabit Ethernet gets invented, for example, it might be easiest to let it occupy two ITU grid spaces, or 1.5, or some other arbitrary proportion. (See OFC/NFOEC: For ROADMs, Less Is More.)

Here's a 2010 video where Wellbrock goes over these issues.



The business
As of 2009, JDSU was the market leader in ROADM components, with Finisar Corp. (Nasdaq: FNSR) coming on strong as a competitor. (See Finisar Climbs ROADM Ranks.)

Recent acquisitions and partnerships related to ROADMs:

Finisar CEO Jerry Rawls explains the Nistica deal at the end of this video, from OFC/NFOEC 2008.



(7)  | 
Comment  | 
Print  | 
Newest First  |  Oldest First  |  Threaded View        ADD A COMMENT
Author67818
50%
50%
Author67818,
User Rank: Light Beer
8/16/2016 | 6:04:08 AM
Awesome
I want to use ROADM but which service provider will best.

Zaful Coupons
DelGilmore
50%
50%
DelGilmore,
User Rank: Light Beer
6/10/2016 | 8:25:13 AM
To easy to do
To easy to do this stuff visit my web address t fine out some more..
lifeuptimize
50%
50%
lifeuptimize,
User Rank: Light Beer
4/17/2016 | 1:55:26 PM
Hard
Its very hard to reconfigurable  optical add.If you have know knowledge about that please dont do that.Use any specialist.

Regards

Coquitlam counselling Bc
msp7
50%
50%
msp7,
User Rank: Light Beer
1/21/2016 | 3:23:11 AM
fb online
this is the tool for generator of hacker facebook that can give you fb account online.
PriscillaNichols
50%
50%
PriscillaNichols,
User Rank: Light Beer
6/9/2015 | 6:13:00 AM
roadms
The consecutive falling of two waves will create nodes where the frequency will be zero. The ROADMs has provided the option to change the frequency manually. To get it automatically it has to follow aussie essay which has the leads to do it.
^Eagle^
50%
50%
^Eagle^,
User Rank: Light Beer
12/5/2012 | 5:09:26 PM
re: Reconfigurable Optical Add/Drop Multiplexer (ROADM)


Hello,


Just read a portion of your story of new products at OFC.  When reading the ROADM portion, I did not see any "new" news.  Only old news.  ather it was a summary of actions in the ROADM space and stories in 2009 / 2010.  I mistakenly assumed this story was to have new content and to be about new announcements at OFC 2011.


sailboat

LEO_YOUNG
50%
50%
LEO_YOUNG,
User Rank: Light Beer
12/5/2012 | 5:06:01 PM
re: Reconfigurable Optical Add/Drop Multiplexer (ROADM)


Too too old news!

Light Reading’s Upskill U is a FREE, interactive, online educational resource that delivers must-have education on themes that relate to the overall business transformation taking place in the communications industry.
NEXT COURSE
Wednesday, September 28, 1:00PM EDT
Gigabit 101
Will Barkis, Senior Technology Analyst, Orange
UPCOMING COURSE SCHEDULE
Friday, September 30, 1:00PM EDT
Gigabit & the Great Migration
Robert Howald, Vice President, Network Architecture, Comcast
Wednesday, October 5, 1:00PM EDT
Gigabit & Smart Cities
Joe Kochan, COO & Co-Founder, US Ignite
Friday, October 7, 1:00PM EDT
Gigabit & DOCSIS 3.1
Ty Pearman, Director, Access Architecture, Comcast
in association with:
From The Founder
Light Reading today starts a new voyage as part of a larger Enterprise.
Flash Poll
Live Streaming Video
Charting the CSP's Future
Six different communications service providers join to debate their visions of the future CSP, following a landmark presentation from AT&T on its massive virtualization efforts and a look back on where the telecom industry has been and where it's going from two industry veterans.
LRTV Interviews
Global Services: The $40B Face-Off

9|26|16   |   05:53   |   (0) comments


More service providers than ever before are battling it out to win a slice of what is now a $40 billion global communications services pie, explains Ovum Principal Analyst David Molony.
LRTV Documentaries
MEC Congress: The Key Takeaways

9|22|16   |   03:25   |   (3) comments


Three key takeaways from the Mobile Edge Computing (MEC) Congress in Munich, Germany.
Wagner’s Ring
Time to Shut Up About 'Dumb Pipes'

9|22|16   |     |   (12) comments


Service providers can't compete with OTT players. It just isn't in their DNA. Instead, service providers need to embrace what they're good at -- providing reliable, secure connectivity.
Wagner’s Ring
Keeping Your Tech Career Going After 50

9|21|16   |     |   (13) comments


How do you keep your career moving forward when you're past the half-century mark?
LRTV Interviews
Peering Into the Digital Future

9|20|16   |   04:25   |   (0) comments


Nick Thomas, practice leader of digital media at Ovum, talks about how digital transformation in the technology, media and telecom sectors will enable the development of a new range of applications and services for enterprises and consumers and how the upcoming Digital Futures event in London will examine ...
LRTV Custom TV
Napatech Tackles NFV's Major Challenge

9|7|16   |   08:42   |   (0) comments


One of the main challenges for network operators introducing NFV is to combine performance and flexibility in a cost-effective way, but there is a solution, explains Napatech's Dan Joe Barry.
LRTV Custom TV
Huawei Optical Innovation 2016

9|6|16   |     |   (0) comments


Highlights of the 2016 Huawei Optical Innovation forum.
LRTV Huawei Video Resource Center
Are You Ready for Huawei Connect 2016?

8|31|16   |     |   (0) comments


Join us for an exclusive sneak peak of Huawei Connect, an integrated conference for the global ICT ecosystem taking place in Shanghai.
Between the CEOs
CEO Chat: UXP's Gemini Waghmare

8|26|16   |     |   (0) comments


Light Reading CEO Steve Saunders and UXP Systems CEO Gemini Waghmare discuss the strategic importance of digital identity for operators in the midst of transformation.
LRTV Custom TV
F5 Virtual Network Function Integrations With Partner Orchestration Platform

8|24|16   |   6:38   |   (0) comments


F5's Kishore Patnam, product manager for F5's service provider solutions, discusses why service providers are moving towards virtualization and how his clients are utilizing F5's solutions.
Between the CEOs
CEO Chat: Intel's Alexis Black Bjorlin

8|17|16   |   06:23   |   (0) comments


Join us for an in-depth interview between Steve Saunders of Light Reading and Alexis Black Bjorlin of Intel as they discuss the release of the company's Silicon Photonics platform, its performance, long-term prospects, customer expectations and much more.
Telecom Innovators Video Showcase
Accelerating Telecom Digital Transformation With Nominum DNS

8|1|16   |   12:04   |   (0) comments


Light Reading's Steve Saunders gets an update from Nominum CEO Gary Messiana on how his company is helping carriers on the digital transformation journey.
Upcoming Live Events
November 3, 2016, The Montcalm Marble Arch, London
November 30, 2016, The Westin Times Square, New York City
December 1, 2016, The Westin Times Square, New York, NY
December 6-8, 2016, The Westin Excelsior, Rome
May 16-17, 2017, Austin Convention Center, Austin, TX
All Upcoming Live Events
Infographics
Hot Topics
Keeping Your Tech Career Going After 50
Mitch Wagner, West Coast Bureau Chief, Light Reading, 9/21/2016
Time to Shut Up About 'Dumb Pipes'
Mitch Wagner, West Coast Bureau Chief, Light Reading, 9/22/2016
Comcast Will Go Wireless in 2017
Mari Silbey, Senior Editor, Cable/Video, 9/20/2016
Sprint CEO: We'll Lease Spectrum as Soon as Possible
Dan Jones, Mobile Editor, 9/20/2016
Like Us on Facebook
Twitter Feed
BETWEEN THE CEOs - Executive Interviews
Light Reading CEO Steve Saunders and UXP Systems CEO Gemini Waghmare discuss the strategic importance of digital identity for operators in the midst of transformation.
Join us for an in-depth interview between Steve Saunders of Light Reading and Alexis Black Bjorlin of Intel as they discuss the release of the company's Silicon Photonics platform, its performance, long-term prospects, customer expectations and much more.
Animals with Phones
You Thought Your Customer Service Was Unreliable... Click Here
Live Digital Audio

A vital part of increasing the number of women in comms is transforming the ways companies can support and empower women. While progressive company policies that support both men and women in achieving work-life balance are a step in the right direction, creating a company culture that supports those policies can at times be more challenging.

During this show, we'll talk to Lynn Comp, Senior Director of Industry and Sales Enabling (ISE) in the Network Platforms Group at Intel, about why those challenges exist and how companies can overcome them. She'll provide insight into how Intel has worked to create a culture that supports work-life balance, and provide steps and guidance for other companies wishing to do the same. We will also leave plenty of time to get your questions answered live on the air.