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Furukawa, OFS And Corning Achieve Milestone For Optical Interconnects

SAN FRANCISCO, March 6, 2014 /PRNewswire/ --  OFC/ NFOEC 2014, Booth 4153 – Furukawa Electric Co., Ltd. has developed a vertical cavity surface emitting laser (VCSEL) that operates at 25 Gbps and realized transmission of up to 500 meters over prototype multimode fibers developed by OFS and Corning Incorporated (NYSE:GLW). 

"This is a significant accomplishment for data communications as both longer reaches and higher speeds are required for warehouse-scale data centers.  Our customers are raising expectations as they implement next-generation data centers and we are pleased to be innovating the technology to meet and exceed those expectations," said Dr. Haruki Ogoshi, senior fellow of Furukawa.

The rapid growth of cloud computing and expansion of "big data" is causing a dramatic increase in the volume of data handled in data centers. This has generated demand for greater throughput in servers, switches and routers in data centers.  Increasing the serial speed of transmission of lasers and photo detectors is one approach to that end. In addition, there is a need to increase transmission distances between devices as data centers become larger. In mega data centers, for example, transmission distances of 300 m or longer can be required. At present, VCSELs at a wavelength of 850 nm are widely used for lowest cost optical interconnect.  However, it is known that when the transmission speed is changed from 10 Gbps to higher-speed 25 Gbps, the transmission distance is limited to less than   200 m due to the influence of chromatic dispersion in multimode fibers.

In order to solve these issues, Furukawa has developed a VCSEL with a wavelength of 1060 nm that operates at 25 Gbps.

"Increasing the VCSEL wavelength from 850 to 1060 nm reduces chromatic dispersion of fibers by approximately two thirds," says Dr. Durgesh Vaidya, Senior Manager Research and Development for OFS.  "Accordingly, use of a multimode fiber with the modal dispersion minimized at 1060 nm reduces transmission impairments and allows transmission distances to be extended. It is widely expected that it will be easier to increase VCSEL speeds in the future beyond 25 Gbps by moving from 850 to higher wavelengths."

Furukawa created a prototype optical module integrating the newly developed 1060 nm VCSEL in a small package with a driver integrated circuit and then conducted a transmission experiment close to actual operating conditions. When a multimode fiber from OFS or Corning was used with the modal dispersion optimized for a wavelength of 1060 nm, a long-reach of 300 m was achieved.   In a joint experiment, a short length of modal dispersion-compensating fiber developed by Corning was used in conjunction with standard OM4 multimode fiber, and a transmission distance of 500 m was achieved. These results were obtained without the use of electrical compensation technologies such as a clock data recovery or an error correction.  In this way, FEC's new VCSEL technology can allow for an increase in speed and distance without complicating future systems. 

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