Tone spacing and power level monitor for FSK lightwave systems

Details Tone spacing and power level monitor for FSK lightwave systems Tone spacing and power level monitor for FSK lightwave systems

1989-12-18

1992-07-21

Coles, Sr., Edward L.

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359192, H04B 1004

Patent

active

051328291

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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Hodgkinson et al., "Polarization Insensitive Heterodyne Detection Using Polarization Scrambling", 6th International Conference on Integrated Optics and Optical Fiber, Jan. 19-22, 1987.
Hodgkinson et al., "Polarization Insensitive Heterodyne Detection Using Polarization Scrambling", Electronic Letters, May 7, 1987, vol. 23, #10, pp. 513-514.
Hodgkinson et al., "Demodulation of Optical DPSK Using in Phase and Quadrature Detection" Electronics Letters, Sep. 12, 1985, vol. 21, #19, pp. 867-868.

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