Optical FSK demodulator
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United States of America Patent
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Dec 12, 1989
Issued Date -
N/A
app pub date -
Feb 16, 1989
filing date -
Oct 23, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An optical demodulator in which a local oscillator reference signal and a frequency shift keyed modulated input signal are optically combined by means of an optical multiport junction. These signals are detected to produce phase-diverse electrical signals at beat frequency and electrically processed to provide a demodulated signal. The electrical processing circuitry is phase discriminating and thus produces a signal in which the amplitude is dependent upon the lead/lag phase relationship of the detected signals. The local oscillator is tuned to, and maintained at, a frequency that is midway between the FSK signal tones so that the lead or lag of phase is directly related to the frequency shift coding. The phase discriminant signal processing may be performed using envelope detection.
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