Optical communications – Transmitter
Reexamination Certificate
2007-08-14
2007-08-14
Chan, Jason (Department: 2613)
Optical communications
Transmitter
Reexamination Certificate
active
09735710
ABSTRACT:
An optical signal return path system includes a transmitter having a sample clock generator for generating a sample clock and an RF signal receiver for receiving and converting an analog RF data signal into a first data stream of digitized RF data samples at a rate determined by the sample clock. Supplemental channel circuitry provides a second data stream. A multiplexor receives and combines the first data stream and second data stream, and an optical transmitter converting the combined data stream into a serialized optical data signal for transmission over an optical fiber. The second data stream may contain maintenance data reflecting an operational state of the transmitter. A receiver receives the optical data signal and recovers therefrom a digital data stream and an associated first clock having an associated first clock rate. The data stream is stored in a memory device at the first clock rate. A clock generator generates a second clock having an associated second clock rate that is adjusted in accordance with a clock control signal. A control circuit reads data from the memory device at a rate corresponding to the second clock rate and generates a fullness signal that indicates whether the memory device is more full than a predefined threshold fullness level. A clock speed adjusting circuit generates the clock control signal in accordance with the fullness signal.
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Lawson Arthur Michael
Levinson Frank H.
Mostert Willem A.
Sage Gerald F.
Chan Jason
Finisar Corporation
Wang Quan-Zhen
Workman Nydegger
LandOfFree
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