Coherent RF-photonic link linearized via a negative feedback...

Details Coherent RF-photonic link linearized via a negative feedback... Coherent RF-photonic link linearized via a negative feedback...

2011-01-25

2011-01-25

Vanderpuye, Kenneth N (Department: 2613)

Optical communications

Transmitter

Including compensation

C398S183000, C398S188000, C398S202000, C398S206000

Reexamination Certificate

active

07877020

ABSTRACT:
In one of many possible implementations and embodiments, a method is provided for providing linearized phase modulation and demodulation in an RF-photonic link. This includes phase modulating a photonic carrier signal in a signal arm using the RF input and using the RF output in a negative feedback phase tracking loop to modulate either the RF input modulated carrier signal in the signal arm, or a signal in a local oscillator arm. Optical signals from the signal arm and the local oscillator arm are optically coupled. The optically coupled signals are photodetected and differentally combined. The differentially combined signals are amplified to provide the RF output signal. In some implementations, the photonic carrier signal is suppressed prior to photodetection. Further, in some implementations a small portion of the local oscillator signal may be coupled with the carrier suppressed optical signal.

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USPTO Office Action, mailed Jun. 22, 2010 for U.S. Appl. No. 11/796,172, filed Apr. 27, 2007, Inventor Robert R. Hayes.
USPTO Office Action, mailed Oct. 1, 2009 for U.S. Appl. No. 11/796,172, filed Apr. 27, 2007, Inventor Robert R. Hayes.

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