Demodulation technique for coherence multiplexed optical data tr

Details Demodulation technique for coherence multiplexed optical data tr Demodulation technique for coherence multiplexed optical data tr

1988-07-22

1989-11-21

Griffin, Robert L.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455612, 455619, 370 1, 350 9614, H04B 900

Patent

active

048827754

ABSTRACT:
An improved demodulator and demodulation method usable in a coherence multiplexed, optical data transmission system. The demodulator comprises an interferometer and a signal processor. The interferometer has first and second arms having first ends coupled to receive radiation from an optical bus, and second ends connected to the signal processor. The path length difference between the arms is selected to approximately match that of a corresponding modulator, to within the coherence length of the optical carrier. The signal processor processes the optical signals emerging from the arms in combination, to produce a pair of electrical ouput signals. Linearly independent pairs of electrical ouput signals are produced for any two modulation signals that do not produce modulator optical path length differences that differ from one another by an integral multiple of a half wavelength of the optical carrier. In a preferred embodiment, the electrical output signals correspond to the cosine and sine of the phase modulation angle produced in the associated modulator.

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Papuchon et al., "4-Bits Digitally Driven Intergrated Amplitude Modulator For Data Processing", Electronic Letters; Feb. 14, 1980, vol. 16, No. 4, pp. 142-144.
Goedgebuer, Salcedo and Vienot, "Multiplex communication via electro-optic phase modulation of white light", OPTICA ACTA, vol. 29, No. 4, pp. 471-477, (1982).

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