Tone spacing and power level monitor for FSK lightwave systems
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United States of America Patent
Stats
-
Jul 21, 1992
Grant Date -
N/A
app pub date -
Dec 18, 1989
filing date -
Dec 18, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Apparatus and method are disclosed for controlling the tone spacing (2.omega..sub.d) and output power level in an FSK lightwave transmitter. An arrangement is utilized which splits a tapped-off portion of the output data stream into two essentially equal components. A first component is then delayed and scrambled (polarization state) with respect to the second component. Self-heterodyning of the two signals results in forming a signal at the beat frequency, or tone spacing value. By comparing this beat frequency with a predetermined tone spacing value, adjustments may be made to the transmitter to maintain the desired tone spacing value. The self-heterodyned signal will also contain a component indicative of the data signal power level and may be utilized to adjust the transmitting device so as to maintain a constant power.
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Cited Art Landscape
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