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May 23, 2013

Development of the World's First 40-60 Gbps Silicon Photonics

Quadrature Phase-shift Keying Modulator

 

May 23, 2013


Fujikura Ltd. (Yoichi Nagahama, President & CEO,
hereinafter referred to as "the Company") announces that the company
developed the world's first 40-60 Gbps silicon photonics modulator.


The company has newly developed two types of modulators -
Quadrature Phase-Shift Keying (QPSK) and Differential QPSK (DQPSK)
- for high speed long-haul data transmissions. This is a big step to realize
ultra-high bandwidth, low cost and compact optical network equipment based on
silicon photonics technology.


The modulator comprises two silicon phase-shifters that are integrated
in a nested Mach-Zehnder configuration. The company optimized electrode
arrangements and doping profiles in the phase-shifters, which materializes
high-speed performance of >40 Gbps DQPSK and >60Gbps QPSK modulation
at less than 10dB fiber-to-fiber loss. Moreover, dispersion tolerance of more
than +/-80 ps/nm is recorded at the 44.6 Gbps DQPSK transmission.

This remarkable achievement was reported on March 20, 2013 at OFC/NEOEC 2013,
the largest global conference and exhibition on optical communications
and networking, that was held in Anaheim Convention Center, Anaheim, CA, USA,
March 17-21, 2013.


This modulator is a part of development outcomes which the Company
and Institute of Microelectronics (IME) / A*STAR*1
have cooperatively achieved. They have been developing various technologies for
optical telecommunications components since 2006. In the recent two years, this
joint effort resulted the release of an evaluation module of 10 Gbps silicon
modulator on February 28, 2013 and today they announce the development of
40-60Gps silicon based modulators.



*1 Institute of Microelectronics is a research institute under the Agency for Science,
Technology and Research (A*STAR) in Singapore.