System and method for optical heterodyne detection of an...

Details System and method for optical heterodyne detection of an... System and method for optical heterodyne detection of an...

2006-04-11

2006-04-11

Bello, Agustin (Department: 2633)

Optical communications

Receiver

Heterodyne

C356S484000

Reexamination Certificate

active

07027743

ABSTRACT:
An optical heterodyne detection system includes a tunable optical pre-selector that is adjusted to track the frequency of a swept local oscillator signal. The tunable optical pre-selector is adjusted in response to a measure of the frequency of the swept local oscillator signal and in response to a measure of a portion of the swept local oscillator signal after the portion of the swept local oscillator signal has optically interacted with the optical pre-selector. In an embodiment, at least some portion of the swept local oscillator signal is modulated before it interacts with the optical pre-selector. In an embodiment, the portion of the swept local oscillator signal that interacts with the pre-selector is detected and used in a feedback control circuit to generate a control signal which causes the error between the center frequency of the pre-selector and the frequency of the swept local oscillator signal to be small.

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patent: 0491421 (1992-06-01), None
patent: 2213026 (1989-08-01), None

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