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Optoelectronics/Displays  

DQPSK modulator delivers 'lowest' drive voltage

Posted: 09 Apr 2007     Print Version  Bookmark and Share

Keywords:DQPSK LN modulator  optical transmission  DQPSK transmission technology 

Fujitsu Ltd has announced what it claims is the world's lowest drive voltage DQPSK LN optical modulator for 40Gbps optical transmission systems. The product, which promises to make possible the construction of commercial systems with greater reliability, low power consumption and superior transmission quality, will be available from June 1, 2007.

40Gbps core optical network systems are being deployed in response to increases in data transmission traffic brought about by the global expansion of broadband networks. While many optical transmission signal encoding methods are under consideration, DQPSK transmission technology is becoming essential due to its strength against signal distortions resulting from transmission fibres and relay nodes, as well as its superior bandwidth efficiency. The technology overcomes the challenge of achieving both low drive voltage and broadband capabilities required for commercial optical transmission systems.The new LN modulator achieves a low drive voltage of 4V, making it a practical optical modulator for use in commercial systems. Using technology similar to that employed in previously commercialised 40Gbps LN moderators, a 25GHz bandwidth has been achieved.

Positioning multiple high-speed electrical signal input terminals close together on one side of the modulator generates DQPSK signals without the need to adjust for electrical signal lag on the drive circuit. Employing separate input terminals and the DC bias signals for controlling the modulator eliminates the need for an external electrical circuit to combine them.




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