Method and circuit for generating single-sideband optical...

Details Method and circuit for generating single-sideband optical... Method and circuit for generating single-sideband optical...

2005-11-29

2005-11-29

Chan, Jason (Department: 2633)

Optical communications

Transmitter

Having particular modulation

C398S196000

Reexamination Certificate

active

06970655

ABSTRACT:
The present invention relates to a method for generating a single-sideband optical signal. According to the method, as data signals having a 90-degree phase difference with respect to input data signals, which are NRZ signals at 10 Gb/s, 0.5-bit delay data signals are generated by a 0.5-bit delay circuit for obtaining a delay corresponding to π/2 of the bit period of the input data signal. An SSB optical signal produced from the data signals and the 0.5-bit delay data signals is generated through an optical filter. Further, to eliminate a residual intensity-modulated component, the generated SSB optical signal is fed back to appropriately adjust the center frequency of the optical filter. The carrier output frequency of a semiconductor laser can be adjusted instead of the center frequency of the optical filter. When an RZ signal is used as an input data signal, a 0.25-bit delay circuit is used.

REFERENCES:
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patent: 61-13231 (1986-01-01), None
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S. Shimotsu et al., “LiNbO3Optical Single-Sideband Modulator”, 25thOptical Fiber Communication Conference, Mar. 2000, PD16-1-PD16-4.

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