New technology enables ultra high-capacity inter-city optical networks
(Technology News, 10 Apr 2007 )
Yokogawa Electric Corporation and Fujitsu Limited have announced the joint development of the world's first practical 40 Gbps optical transmission technologies using differential quadrature phase shift keying (DQPSK). The two companies are respectively planning to incorporate the technologies in various new products for 40 Gbps ultra high-speed optical transmission networks.
The new technologies were developed under the strategic partnership established between Yokogawa and Fujitsu in March of 2006 to jointly develop core system technologies and key components for ultra high-speed optical transmission systems, and with the cooperation of Fujitsu Laboratories Ltd.
The LN optical modulator[5] for DQPSK modulation, which was developed by Fujitsu and operates with the world's lowest drive voltage, enables a compact optical transmission component design and lower power consumption.
Compact, low power consumption dedicated ICs and other devices that enable DQPSK, including a driver device optimized for the DQPSK LN optical modulator mentioned above, optical / electrical conversion devices that operate stably despite PMD waveform distortion, and clock and data recovery devices, were developed with Yokogawa Electric's InP HBT technology.
Control technology was developed that allows the newly developed key devices to operate in a stable manner as well as mounting technology that enables a compact size, making possible a compact 110 mm x 320 mm x 40 mm package equipped with all functions necessary for 40 Gbps DQPSK in the transmission equipment and a low-power consumption of 35 W (with case temperature of 72 C).
