Method and apparatus for obtaining phase in sensitive and/or pol

Optical: systems and elements – Deflection using a moving element – Using a periodically moving element

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H04B 1000

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050817124

ABSTRACT:
Apparatus and method for obtaining a phase insensitive and/or polarization insensitive optical heterodyne reception for a FSK modulated transmission signal which uses a low intermediate frequency relative to the data rate of the transmission signals and at every clock of the transmission signal, the phase is keyed between 0 and 90.degree. at the starting time and in the middle of the clock time the polarization of the signal is keyed between two mutually orthogonal polarization conditions at the start of the second and the start of the fourth quarter of the clock time and the phase independent and/or polarization independent output signal of the receiver is obtained from the signal which is shift keyed in a simple optical heterodyne receiver for FSK modulated transmission signals.

REFERENCES:
patent: 4718120 (1988-01-01), Tzeng
patent: 4856094 (1989-08-01), Heidrich et al.
patent: 4965857 (1990-10-01), Auracher
patent: 4984297 (1991-01-01), Manome
Article entitled "Phase-Insensitive Zero-IF Coherent Optical Detection Using Sinusoidal Phase Modulation Instead of Phase Switching from the Proceedings of the ICOC 1988", Part 2, pp. 65-68.
Article entitled "New FSK Phase-Diversity Receiver in a 150 Mbits Coherent Optical Transmission System", Electronics Letters 28 Apr. 1988, vol. 24, No. 9, pp. 567-568.

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