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Mitsubishi Electric Develops DFB Laser Diode For 100Gbps Systems

New current-blocking structure allows low power consumption, high performance, and simplified transceiver design

Mitsubishi Electric Corporation has announced today that it has developed a distributed feed-back (DFB) laser diode for 25Gbps optical-fiber communication in 100Gbps systems operating in a wide range of temperatures from -20 to 85degC.

Four DFB laser diodes can be mounted on 100Gbps high-speed communication transceivers for optical fibre communication to achieve lower power consumption and enhanced communication performance for increased efficiency in data centers. The new DFB laser diode will also help to simplify the requirements for transceiver design.

In the effort to develop a DFB laser with high-speed response suited to 25Gbps operation, Mitsubishi Electric developed new current-blocking structure with semi-insulating semiconductors that realise efficient current injection in the active region.

The new current-blocking structure achieves low capacitance for efficient current injection without degrading high-speed response. Also the current injection efficiency in active region is improved 12 percent compared with company's existing products. More than 10mW output power at 85degC is obtained.

High-temperature operability eliminates the need for cooling, helping to reduce power consumption. Transmitter Optical Sub Assembly (TOSA) for 100Gbps transmission includes 4-wavelength 25Gbps DFB lasers. The DFB lasers' high output power compensates for the optical loss caused by an optical multiplexer inside the TOSA.

Moreover, wide-ranging temperature operability and high-quality modulation waveform help to simplify the designs of 100Gbps transmission systems.

The current-blocking structure with low capacitance and short laser length (75 percent the length of the company's existing products) enables top-quality modulation waveform with mask margin of more than 20 percent, according to the company.

Mitsubishi Electric will present its new laser diode at the Optical Fiber Communication Conference and Exposition 2015 (OFC 2015), which is scheduled to be held at the Los Angeles Convention Centre in Los Angeles, California from March 22 to 26.



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