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DQPSK |
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Tokyo, Japan, Apr 5, 2007 - (JCN Newswire) - Yokogawa Electric Corporation and Fujitsu Limited today announced the joint development of the world's first practical 40 Gbps optical transmission technologies using differential quadrature phase shift keying (DQPSK)[1]. [1] Differential Quadrature Phase Shift Keying (DQPSK): A method for modulating digital signals in which 2 bits of data are allocated to each of 4 modulated optical phases (0, 90, 180 and 270 degrees). 11b Modulators/Demodulators -- 1 Mbps Differential Binary Phase Shift Keying (DBPSK) -- 2 Mbps Differential Quadrature Phase Shift Keying (DQPSK) -- 5. |
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