Fujitsu introduces compact integrated DP-QPSK receiver for 100Gbps digital coherent receiving systems - Lightwave

Fujitsu introduces compact integrated DP-QPSK receiver for 100Gbps digital coherent receiving systems

MARCH 12 , 2010 -- Fujitsu Optical Components Limited will be releasing, on May 1, a compact integrated DP-QPSK receiver that supports 100Gbps digital coherent receiving systems.

This new product incorporates PLC and micro-assembly technologies to allow the integration of 90-degree Hybrids, Balanced Receivers, and Polarizing Beam Splitters all into a single package. The Fujitsu 100-Gbps DP-QPSK receiver is a sophisticated integrated receiver that is both compact and inexpensive. This product will help facilitate the production of compact, low-cost, high-performance 100-Gbps optical network systems.

The rapid increase in the volume of communications traffic that has resulted from the spread of new services such as cloud computing and on-line streaming in recent years has created demand to put the research and development that has gone into100Gbps optical networks into practical use.
Various encoding systems have been studied for 100-Gbps optical transmission signals. DP-QPSK is a phase-modulation system that transmits 2-bit signals represented by four phases on two orthogonally polarized light beams respectively. The DP-QPSK signaling scheme reduces the effective symbol rate to one quarter of the system bit rate. This lowered symbol rate permits the use of electrical and optical components with lower operating bandwidths and improves the system immunity to factors that significantly limit transmission/polarization mode dispersion). DP-QPSK systems are widely recognized as being the leading-edge technology on the market.

Significant research and development in recent years has also been conducted into digital coherent receiving technology. Systems using this technology utilize digital signal processing techniques to compensate for waveform distortion in the transmission path. This allows for optical dispersion compensators and optical amplifiers for loss compensation in the system to be eliminated thus greatly reducing the system cost.

Owing to the above-mentioned advantages, DP-QPSK transmission technology using a digital coherent receiving system is now commonly used for 100Gbps transmissions. The standardization of this transmission technology is now being undertaken by the OIF.

Using the technologies described below, Fujitsu Optical Components Limited says it has successfully commercialized a compact, low-cost 100-Gbps integrated DP-QPSK receiver that supports digital coherent receiving systems. This receiver makes it possible to reduce the size and cost of 100-Gbps optical network systems while simultaneously achieving improved system performance, the company asserts.

Fujitsu Optical Components Limited plans to display samples of this product at OFC/NFOEC 2010, which is scheduled to take place from March 23 to 25 in San Diego.

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