& 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.
From The Founder
Either we perform a complete 'factory reset' on the way the telecom industry creates and deploys virtualization, or we face the consequences.
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 Custom TV
Infinera Introduces Instant Network

4|20|17   |     |   (0) comments


Mike Capuano, vice president of marketing at Infinera, discusses the advancement from Instant Bandwidth to new Instant Network capabilities, which include Bandwidth License Pools, Moveable Licenses and Automated Capacity Engineering (ACE).
Women in Comms Introduction Videos
Vodafone's Eubank on Sponsors, Mentors & Moving On Up

4|19|17   |   4:25   |   (0) comments


Vodafone America's Head of Operations Kimberly Eubank breaks down the difference between a sponsor and a mentor and shares why both made a big difference in her career.
LRTV Custom TV
NYC Auto Show: Are We Smart Yet?

4|18|17   |     |   (0) comments


The auto industry is facing some big transformations as electric vehicles, autonomous technology and connected cars are seen as the future of the industry. During the much-anticipated NY international auto show, there was an emergence of new technology and mobility service on the show floor. Aside from performance, brands like Lincoln, Hyundai, Honda, Mercedes and ...
LRTV Huawei Video Resource Center
The Impact of Video

4|18|17   |     |   (0) comments


David Mercer from Strategy Analytics discusses the impact of video on current strategies.
LRTV Custom TV
Pardeep Kohli Discusses Network Transformation & the Market Opportunity for the 'New' Mavenir Systems

4|13|17   |     |   (0) comments


In a brief discussion at MWC 2017, Heavy Reading analyst Adi Kishore talks to Pardeep Kohli, CEO, Mavenir Systems about the creation of the 'new Mavenir' and some of the key challenges facing operators in today's market. A key theme of the discussion centers around operator need for software-only, virtualized solutions and how they will need to adapt to ...
Women in Comms Introduction Videos
Tech Maverick Shares Her Tips for Gender Inclusivity

4|12|17   |   7:28   |   (0) comments


Wendy Hall Bohling, a corporate escapee, author and gender exclusivity consultant, tells her story of sexism, bias and progress along the road to gender equality in the workforce.
LRTV Huawei Video Resource Center
Huawei at MWC 2017

4|11|17   |     |   (0) comments


At Mobile World Congress 2017, the biggest mobile industry gathering of the year, Huawei showcased its new innovations and solutions with the theme "Open Road," which focuses on cloud, 5G, operation transformation, videos and consumer-oriented products. Its campaign has been recognized by three awards given by GSMA.
LRTV Custom TV
China Telecom NFV Infrastructure on RSD

4|6|17   |     |   (0) comments


Lynn Comp, senior director of market development of Intel, is joined by Chong Zhang, storage engineer at Inspur and Ou Li Yan, architect for technology strategies of China Telecom on what NFV brings.
LRTV Custom TV
Nokia's IMPACT Software Demo

4|6|17   |     |   (0) comments


Khamis Abulgubein of IoT market development at Nokia demonstrates IMPACT (intelligent management platform for all connected things), a software solution with a horizontal approach to managing any device on any application.
LRTV Custom TV
Nokia Introduces Virtual Service Router for More Rapid Service

4|6|17   |     |   (0) comments


James Cumming, product line manager for virtualized service routers at Nokia, demonstrates how the virtual router based off the Nokia ecosystem changes the network function experience.
LRTV Custom TV
The Keys to SD-WAN Success

4|6|17   |     |   (0) comments


Versa Networks CEO Kelly Ahuja talks about the key requirements for service provider-managed SD-WANs.
LRTV Custom TV
Intel & Cisco on Joint 5G Solutions

4|5|17   |     |   (0) comments


Dave Ward, SVP and CTO of Cisco, is joined by Sandra Rivera, corporate VP and general manager of network platforms group of Intel, on the revolutionary 5G technology that changes networking and computing fundamentally.
Upcoming Live Events
May 15-17, 2017, Austin Convention Center, Austin, TX
May 15, 2017, Brazos Hall - Austin, TX
May 15, 2017, Austin Convention Center - Austin, TX
June 6, 2017, The Joule Hotel, Dallas, TX
All Upcoming Live Events
Infographics
With the mobile ecosystem becoming increasingly vulnerable to security threats, AdaptiveMobile has laid out some of the key considerations for the wireless community.
Hot Topics
Time for a Telecom Reboot
Steve Saunders, CEO and founder, Light Reading, 4/19/2017
Comcast Ready for Clash With Hulu
Mari Silbey, Senior Editor, Cable/Video, 4/18/2017
Unlicensed: It's What's Next for US Mobile Operators
Dan Jones, Mobile Editor, 4/19/2017
Verizon's Fiber Spend Won't End With Corning
Mari Silbey, Senior Editor, Cable/Video, 4/19/2017
Like Us on Facebook
Twitter Feed
BETWEEN THE CEOs - Executive Interviews
One of the nice bits of my job (other than the teeny tiny salary, obviously) is that I get to pick and choose who I interview for this slot on the Light Reading home ...
TEOCO Founder and CEO Atul Jain talks to Light Reading Founder and CEO Steve Saunders about the challenges around cost control and service monetization in the mobile and IoT sectors.
Animals with Phones
Now That's an Ad Campaign Click Here
Meerkats to the rescue!
Live Digital Audio

Playing it safe can only get you so far. Sometimes the biggest bets have the biggest payouts, and that is true in your career as well. For this radio show, Caroline Chan, general manager of the 5G Infrastructure Division of the Network Platform Group at Intel, will share her own personal story of how she successfully took big bets to build a successful career, as well as offer advice on how you can do the same. We’ll cover everything from how to overcome fear and manage risk, how to be prepared for where technology is going in the future and how to structure your career in a way to ensure you keep progressing. Chan, a seasoned telecom veteran and effective risk taker herself, will also leave plenty of time to answer all your questions live on the air.