& cplSiteName &

Japanese Boost 10-Gig Lasers

Light Reading
News Wire Feed
Light Reading
9/30/2004
50%
50%

DORTMUND, Germany -- Breakthrough temperature stability results have been achieved by scientists at Fujitsu and The University of Tokyo from lasers based on quantum dot wafers grown by NL Nanosemiconductor GmbH (Dortmund, Germany), an advanced facility for nano-epitaxy wafers used in semiconductor lasers. The scientists have developed lasers that are capable of maintaining stable optical power output over a wide temperature range at a speed of 10 Gbps. Such devices would enable the creation of optical transceivers which are smaller, cheaper and consume less power than current devices according to Juergen Kurb, CEO of NL Nanosemiconductor.

The laser was developed by a team led by Professor Yasuhiko Arakawa, Director of the Nanoelectronics Collaborative Research Center at The University of Tokyo, and member of the Scientific Advisory Board (SAB) of NL Nanosemiconductor. Details of the results were presented in a paper at the European Conference and Exhibition on Optical Communication 2004 (ECOC) which took place in Stockholm from Sept. 5 to 9. Professor Arakawa had theorized back in 1982 that the operation of quantum dot lasers does not rely on temperature. Since then, prominent researchers including all members of the NL Nanosemiconductor SAB have been perusing a way to demonstrate the superior temperature performance of QD lasers.

Using p-type doped quantum dot lasers, the temperature independent operation was demonstrated between 20°C and 70°C at a wavelength of 1.3 um with an extinction ration of 7dB and for the first time at a speed of 10 Gbps, a typical rate used in today’s LAN / MAN optical backbones. The goal of Arakawa's team is to productize a laser by 2007 which is smaller, operates at lower power and is less expensive than present devices.

"The performance of these quantum dot lasers are far superior to that of conventional quantum well lasers. They exhibit a To of 420°K at room temperature while maintaining a clear eye opening – in other words, they have outstanding temperature insensitivity and at such high speeds." stated Professor Arakawa.

Typically, the threshold current of lasers and efficiency are sensitive to the operating temperature so it is necessary to adjust the bias and modulation currents in order to obtain a good modulated light output waveform. "The benefits are significant - by not requiring TECs (thermo-electric coolers) or having to adjust the bias and modulation currents using complex external circuitry, these lasers will open the way for higher performance and lower cost transceivers" said Alexey Kovsh, CTO of NL Nanosemiconductor, adding "In addition to temperature stability, the reduced optical feedback sensitivity of quantum dot lasers eliminates the need for an expensive optical isolator allowing further savings."

The laser developed by Arakawa's team uses quantum dot technology which has been researched over the past ten years under the direction of Prof. Zh. Alferov, the Nobel Prize winning Head of the Abraham Ioffe Institute (St. Petersburg, Russia), where NL Nanosemiconductor’s technical team hail from. "It is quite gratifying to see yet further confirmation of the benefits which quantum dot technology brings to the commercial world" said Nobel Laureate Prof Zh. Alferov, adding "I expect further breakthroughs with quantum dots such as this which will revolutionize the field of semiconductor lasers."

Nanosemiconductor GmbH

(2)  | 
Comment  | 
Print  | 
Newest First  |  Oldest First  |  Threaded View        ADD A COMMENT
o-man
50%
50%
o-man,
User Rank: Light Beer
12/5/2012 | 1:13:52 AM
re: Japanese Boost 10-Gig Lasers
How can anyone measure how good a school is?

Maybe if people look at successful former students...

I know that you would not have to go far from the Abraham school to find a much better school. Maybe even in the same CITY!
Balet
50%
50%
Balet,
User Rank: Light Beer
12/5/2012 | 1:13:52 AM
re: Japanese Boost 10-Gig Lasers
Noone ever called Ioffe Physical technical institute (one of the best reasearch centers in Russia) Abraham Ioffe Institute.

It's like spitting in the face of thousands russian scientists.
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
CenturyLink: SDN/NFV Pose New Interconnection Possibilities

9|28|16   |   04:37   |   (0) comments


Network operators should develop new APIs and business processes for reselling virtual assets to each other, says CenturyLink's Bill Walker. That will enable them to build digital business portfolios that help them avoid becoming commodity transport providers.
LRTV Interviews
Level 3: Overcoming Terror of Being Supplier, Integrator & Developer

9|28|16   |     |   (0) comments


At Light Reading's NFV & Carrier SDN event in Denver, Travis Ewert of Level 3 Communications said there is terror in becoming supplier, integrator and developer, but it can be overcome and be cost effective.
LRTV Custom TV
Introducing IoT World News

9|27|16   |   01:43   |   (0) comments


Self-driving cars, medical sensors, smart cities... and refrigerators. In order to address the huge scope of IoT, KNect365 has created a unique online community that will help businesses to understand and monetize the opportunities that live within the IoT market. We look forward to welcoming you to IoT World News -- your gateway to a better connected future.
LRTV Interviews
AT&T: Re-usable Functions Next NFV Key

9|27|16   |   06:03   |   (0) comments


The next generation of NFV has to break functions down into re-usable software chunks, making everything much more cloud-like.
LRTV Interviews
Masergy on Security: Attackers Gaining Upper Hand

9|27|16   |   5:10   |   (2) comments


At Light Reading's NFV & Carrier SDN event in Denver, Ray Watson, vice president of Global Technology at Masergy, says that because of the growth in virtualization, the threat landscape is shifting in favor of the attackers. As a result, service providers need to think beyond just defending the perimeter and take a more holistic approach to security.
LRTV Interviews
Verizon Takes Next Step on Biz Virtualization Journey

9|26|16   |   4:38   |   (2) comments


At September's NFV & Carrier SDN event in Denver, Light Reading sat down with Victoria Lonker, director of Product and New Business Innovation at Verizon, to chat about where the carrier is with delivering virtualized services to business customers.
LRTV Interviews
Global Services: The $40B Face-Off

9|26|16   |   05:53   |   (1) comment


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.
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
Time to Shut Up About 'Dumb Pipes'
Mitch Wagner, West Coast Bureau Chief, Light Reading, 9/22/2016
Verizon CFO: Eat Our (Fixed) 5G Dust!
Dan Jones, Mobile Editor, 9/22/2016
WiCipedia: The Women Helping Women Edition
Eryn Leavens, Special Features & Copy Editor, 9/23/2016
Eurobites: Telefónica Taps Juniper for Network Security
Paul Rainford, Assistant Editor, Europe, 9/26/2016
Open Source Getting on My Nerves
Carol Wilson, Editor-at-large, 9/26/2016
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
There's Nothing Like Missing a Full Minute of Pokémon Go 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.