Optical communication device

Details Optical communication device Optical communication device

2005-06-20

2009-06-30

Liu, Shuwang (Department: 2611)

Pulse or digital communications

Transmitters

Angle modulation

C375S298000, C375S300000, C375S244000, C375S279000, C375S329000, C398S188000, C398S198000, C398S183000, C398S185000, C359S279000

Reexamination Certificate

active

07555061

ABSTRACT:
An optical sender is disclosed that operates in a Differential Quadrature Phase Shift Keying modulation scheme for high speed optical transmission and is capable of performing logical calculations at a low speed. The optical sender transmits a Differential Quadrature Phase Shift Keying (DQPSK) signal generated with modulation signals ρkand ηkso that a signal directly output from a signal receiver corresponding to the optical sender is in agreement with data signals Ikand Qkto be transmitted. The signal receiver is capable of modulation by DQPSK, and the modulation signals ρkand ηkare precoded by using the data signals Ikand Qkand the modulation signals one symbol earlier (ρk−1and ηk−1) . The optical sender includes plural precoders that perform logical calculation simultaneously and in parallel on plural data signals one period after another period.

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A. H. Gnauck et al., “Spectrally Efficient (0.8 b/sHz) 1-Tb/s (25×42.7 Gb/s) RZ-DQPSK Transmission Over 28 100-km SSMF Spans With 7 Optical Add/Drops,”ECOC2006, WX6.
R. A. Griffin et al., “Optical Differential Quadrature.Phase-Shift Key (DQPSK) for High Capacity Transmission,”Technical Digest of OFC2002, WX6, pp. 367, 368.
JPO Office Action, with partial English Translation, mailed Jun. 3, 2008 in corresponding Japanese Patent Application No. 2005-054372.

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