Method and system for optical heterodyne detection of an...

Details Method and system for optical heterodyne detection of an... Method and system for optical heterodyne detection of an...

2005-11-29

2005-11-29

Kim, Robert (Department: 2871)

Optics: measuring and testing

By light interference

Using fiber or waveguide interferometer

C356S484000, C359S199200, C359S199200, C359S199200

Reexamination Certificate

active

06970250

ABSTRACT:
Monitoring an optical signal utilizing optical heterodyne detection involves attenuating an input signal before the input signal is combined with a local oscillator signal. The input signal is attenuated in order improve the signal to noise ratio of the heterodyne signal that is generated when the input signal and the local oscillator signal are combined. The signal to noise ratio of the heterodyne signal improves with attenuation of the input signal, specifically in the case where the intensity noise from the input signal is the dominant noise source, because the heterodyne signal and the intensity noise of the input signal scale differently with attenuation of the input signal.

REFERENCES:
patent: 4048573 (1977-09-01), Evans et al.
patent: 4553264 (1985-11-01), Hasegawa et al.
patent: 4856899 (1989-08-01), Iwaoka et al.
patent: 5365335 (1994-11-01), Sorin

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