Optical modulator

Details Optical modulator Optical modulator

2011-07-12

2011-07-12

Martinez, Joseph (Department: 2873)

Optical: systems and elements

Optical modulator

Light wave temporal modulation

Reexamination Certificate

active

07978390

ABSTRACT:
The present invention relates to an optical modulator that generates quaternary amplitude modulated light without inter-symbol-interference by splitting input light into three optical paths, generating a continuous wave signal in a first optical path, generating binary phase modulated lights using a single drive MZ type optical phase modulator in second and third optical paths, and interfering them at in-phase and at field amplitude 1:a:b.

REFERENCES:
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patent: 6798557 (2004-09-01), Leven
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patent: 1 345 072 (2003-09-01), None
patent: 2002-328347 (2002-11-01), None
patent: 2004-348112 (2004-12-01), None
Griffin et al., “10 Gbits/s Optical Differential Quadrature Phase Shift Key (DQPSK) Transmission using GaAs/AlGaAs Integration” OFC2002, paper PD-FD6, 2003.
Sekine et al., “Proposal and Demonstration of 10-Gsymbol/sec 16-ary (40 Gbits/s) Optical Modulation/Demodulation Scheme”, paper We3.4.5, ECOC 2004, 2004.
Ip E et al, “Carrier synchronization for 3- and 4-bit-per-symbol optical transmission”, Journal of Lightwave Technology IEEE USA, vol. 23, No. 12, Dec. 2005, pp. 4110-4124.
Kikuchi N, “Intersymbol interference (ISI) Suppression Technique for Optical Binary and Multilevel Signal Generation”, Journal of Lightwave Technology, IEEE Service Center, New York, NY US, vol. 25, No. 8, Aug. 1, 2007, pp. 2060-2068.

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