Fujitsu intros compact integrated DQPSK receiver for 40G

JANUARY 15, 2010 --Fujitsu Optical Components Ltd. has announced the development of what it asserts is the world’s most compact (45x27x8 mm) integrated DQPSK receiver. The component employs a balanced receiver and a delay line interferometer using planar lightwave circuit (PLC) technology.

The product is designed for use in 40-Gbps transponders for optical networks. Sales of the receiver will begin February 1, 2010.

Fujitsu says the compact size of the receiver will improve the miniaturization of 40-Gbps transponders, thereby making it possible to manufacture environmentally friendly optical transmission equipment for 40-Gbps optical networks.

Key technologies Fujitsu says it has employed include:

• A compact single-chip optical circuit using PLC technology: DQPSK receiver module requires two delay-line interferometers; therefore, the module’s size constraints become more obvious and the complexity of optical coupling increases, which makes it a challenging task to install a lot of optical elements by conventional methods using free-space optics. Fujitsu says it has overcome the technical difficulties by integrating the two delay-line interferometers into a single PLC chip. PLC technology can reduce the manufacturing cost because PLC is manufactured by using the semiconductor wafer processes, Fujitsu adds.
• Integration of the PLC chip, photodetector, and amplifier in a single seal package: The DQSPK receiver module requires integrating the PLC chip and the photodetectors with high efficiency optical coupling. To achieve this, the waveguide design of the PLC chip was optimized and the elements precisely mounted by micro-assembly technology. Hermetically sealed package is also used to achieve the high reliability.
• User-friendly Interface: All DC terminals are located on both side walls separately from the RF signal terminals. By integrating RF signal terminals on one flexible print circuit (FPC), enhanced connection and circuit board arrangements, as well as simplified working processes and manufacturing cost reductions, are achieved, the company concludes.

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