Optical communications – Receiver – Homodyne
Reexamination Certificate
2008-04-29
2011-12-06
Leung, Danny (Department: 2613)
Optical communications
Receiver
Homodyne
C398S204000
Reexamination Certificate
active
08073344
ABSTRACT:
A heterodyne receiver includes first and second laser sources such as laser diodes which generate optical receiver oscillator (RO) signals having respective RO frequencies. Temperature control circuitry controls a temperature difference between the operating temperatures of the sources such that the RO frequencies differ by a difference frequency corresponding to the temperature difference, the difference frequency being offset from a frequency of a modulated millimeter-wave signal by a predetermined intermediate frequency. An electro-optical nonlinear mixer such as a photodiode receives the optical RO signals and the modulated millimeter-wave signal and generates an electrical intermediate-frequency (IF) signal, which is provided to an electrical amplifier/detector to detect the output signal corresponding to the modulation of the modulated millimeter-wave signal. The receiver may be used as part of a heterodyne transceiver which includes a transmitter, and the transmitter may also employ an optical heterodyne structure for generating a millimeter-wave signal for transmission.
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International Search Report and Written Opinion from PCT/US2009-035067, mailed on Apr. 21, 2009.
BainwoodHuang
Leung Danny
Textron Systems Corporation
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