Synchronous, asynchronous, data rate transparent fiber optic communications link
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United States of America Patent
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Dec 15, 1987
Grant Date -
N/A
app pub date -
Jun 3, 1985
filing date -
Jun 3, 1985
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An optical fiber communications link which by means of pulse-width-modulation (PWM) encoding supports either synchronous or asynchronous data transmission and operation over a wide range of data rates. The link utilizes a PWM encoder which accepts either synchronous (clock plus data) or asynchronous (data only) binary inputs and generates a PWM encoded waveform. This waveform is transmitted via an optical transmitter, optical channel (e.g., fiber optics) and optical receiver to the PWM decoder which reconstructs the binary inputs. The optical receiver contains a receiver circuit for assuring automatic gain control regardless of the duty cycle. In the synchronous mode of operation the unsymmetrical clock output is restored to symmetry by using a clock symmetry restoration technique.
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