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Fujitsu, Furukawa push optical networks

Posted: 21 Aug 2009 ?? ?Print Version ?Bookmark and Share

Keywords:optical network? receiver? communications?

Fujitsu Optical Components Ltd and Furukawa Electric Co. Ltd have partnered to jointly develop 40- and 100Gbit/s integrated receivers. 40Gbit/s receivers will be used in 40Gbit/s optical networks, whose deployment is growing constantly on a global scale; 100Gbit/s receivers will be used for next-generation 100Gbit/s optical networks.

Furukawa is responsible for developing PLC technology which effectively reduces the size of integrated receivers. Fujitsu will develop and commercialize the receiver utilizing integrated module technologies for PLC, high-speed photodiodes, and amplifier.

By speeding up its product development process, Fujitsu will deliver compact, energy-efficient and low-price integrated receiver for ultra-high-speed optical networks. And by strengthening PLC technology of the optical interferometric circuits for receiver, Furukawa will market the product as a key device for next-generation optical communications.

Need for speed
In recent years, the global expansion of new services such as cloud computing and on-line streaming has brought about a dramatic increase in data communications. As the data transmission volume of communications networks rises, optical transmission equipment for 40Gbit/s backbone networks is being widely introduced. At the same time, R&D activities related to the commercialization of next-generation 100Gbit/s optical networks have gained significant momentum.

However, due to advances in transmission speed, the components that constitute these optical transmission equipments are growing both in size and complexity. Larger equipment results in the need for larger installation space and higher power consumption. Meeting the demands of growing data communications while reducing environmental impact at the same time has become a major challenge for 40- and 100Gbit/s optical transmission systems.

The multi-level modulation using phase modulation or digital coherent detection is being introduced into 40- and 100Gbit/s optical transmissions compared with traditional on-off keying, since these are not easily affected by signal distortion and noise caused by transmission fibers. The receiver part for DQPSK modulation transmitting 2bits per symbol consists of the delay line interferometer and the balanced receivers, and the receiver part for DP-QPSK modulation of digital coherent detect consists of 90 hybrid (optical mixer) and the balanced receivers, which are installed as discrete components that are connected by fibers. In the future, however, a receiver module that integrates the individual components is required in order to lower the size and cost of 40- and 100Gbit/s systems, as their deployment further expands. Moreover, since the structures of delay line interferometer and optical mixer grow in complexity in DQPSK and DP-QPSK modulations, the PLC technology which helps reduce their size, cost and power consumption becomes very useful.

Leveraging on both companies' long-standing expertise in the optical communications field, the combination of the following technical advantages will speed up the development of integrated receivers.

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