& 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
The independent evaluation of Nokia's key virtual network functions (VNFs) was a defining moment for the Finnish giant.
Flash Poll
Live Streaming Video
The Real-World View of Service Provider Innovation
Executives from Deutsch Telekom, Facebook, AT&T, Vodafone, and Masergy share insights from their company’s major transformation efforts and updates on key issues including open source, managed cloud connections and 5G.
LRTV Documentaries
Light Reading Hall of Fame 2016

5|23|16   |   05:43   |   (0) comments


Find out who has been welcomed into Light Reading's Hall of Fame this year.
LRTV Custom TV
ZTE TM Forum Highlights

5|23|16   |     |   (0) comments


ZTE showcased its new ICT solutions at TM Forum in Nice.
LRTV Interviews
Gamma's MD on the Emergence of UC2

5|20|16   |     |   (0) comments


Gamma Communications Managing Director David Macfarlane believes the unified communications (UC) market has reached a tipping point.
LRTV Custom TV
The Ultimate 5-Minute Guide to Digital Customer Engagement

5|20|16   |     |   (0) comments


In this short video, you will hear all about how Digital Customer Engagement is the key to meeting customer expectations, keeping them happy, and maximizing revenue. VP Product & Marketing at Pontis, Ofer Razon, breaks down for us the five essential capabilities for successful Digital Customer Engagement. Don’t miss!
LRTV Custom TV
NFV in 2016: Part 1 – NFV Use Cases Get Real

5|19|16   |   05:57   |   (0) comments


Consensus is building around the key use cases for NFV, including managed IP services at the network edge and on customer premises, which can generate new revenues from enterprises/SMBs and consumers; Evolved Packet Core to support LTE migration; and adjacent technologies, such as TAS and IMS, to support VoLTE and next-generation charging and policy control ...
LRTV Custom TV
Nokia's Steve Vogelsang on NFV – Part 3

5|19|16   |     |   (0) comments


Steve Vogelsang discusses the challenges of operational transformation and how Nokia helps its customers. Join Steve at the Big Communications Event in Austin the morning of May 24, on his keynote and optical networking panel.
LRTV Interviews
Level 3: Why UC Is In Demand

5|17|16   |   04:12   |   (1) comment


Andrew Edison, Level 3's senior VP of sales, EMEA region, talks about the drivers of growth in the unified communications services market.
LRTV Custom TV
ARM's OPNFV Action

5|17|16   |     |   (0) comments


At the ARM booth at MWC 2016, Joe Kidder and Bob Monkman speak to Light Reading about OPNFV and their upcoming action.
LRTV Custom TV
Nokia's Steve Vogelsang on NFV – Part 2

5|16|16   |     |   (0) comments


Steve Vogelsang gives advice to service providers on how to move to NFV. Join Steve at the Big Communications Event in Austin the morning of May 24, on his keynote and optical networking panel.
LRTV Interviews
Interoute CTO on NFV's Maturity

5|13|16   |   06:46   |   (1) comment


Matt Finnie, CTO at international operator Interoute, explains how NFV has made life easier in terms of logistics and how Interoute can now enable a 'software-defined moment' for its customers.
LRTV Huawei Video Resource Center
UBBS 2016 Highlights

5|12|16   |     |   (0) comments


Highlights of Huawei's UBBS event in Hong Kong.
LRTV Huawei Video Resource Center
European 2020 Digital Agenda

5|12|16   |     |   (0) comments


Anacom's Fatima Barros discusses the plan to bring ultrafast broadband to Portugal by 2020.
Upcoming Live Events
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: Short Skirts & Back-Up Plans
Eryn Leavens, Special Features & Copy Editor, 5/20/2016
Nokia Plays It Smart With Major Mobile Devices Brand Deal
Iain Morris, News Editor, 5/18/2016
Ingenu Revs Up IoT Rhetoric
Iain Morris, News Editor, 5/18/2016
Google Doubles Down on Machine Learning, AI
Mitch Wagner, West Coast Bureau Chief, Light Reading, 5/19/2016
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
Live Digital Audio

Our world has evolved through innovation from the Industrial Revolution of the 1740s to the information age, and it is now entering the Fourth Industrial Revolution, driven by technology. Technology is driving a paradigm shift in the way digital solutions deliver a connected world, changing the way we live, communicate and provide solutions. It can have a powerful impact on how we tackle some of the world’s most pressing problems. In this radio show, Caroline Dowling, President of Communications Infrastructure & Enterprise Computing at Flex, will join Women in Comms Director Sarah Thomas to discuss the impact technology has on society and how it can be a game-changer across the globe; improving lives and creating a smarter world. Dowling, a Cork, Ireland, native and graduate of Harvard Business School's Advanced Management Program, will also discuss her experience managing an international team focused on innovation in an age of high-speed change.