Coherent optical heterodyne transmission system

Details Coherent optical heterodyne transmission system Coherent optical heterodyne transmission system

1992-09-08

1993-11-30

Chilcot, Jr., Richard E.

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359152, 359192, 359195, 359181, H04B 1000, H04B 1006, H04B 1004

Patent

active

052670740

ABSTRACT:
A bidirectional coherent optical transmission system comprises two stations (I and II) each having only a single laser (2, 9), part of the light signal generated by the laser being fed to a glass fibre T and another part of the light signal generated by the laser being used for mixing the received light signal down to an intermediate frequency by means of a photoelectric diode (4, 11). In contradistinction to the prior art transmission system, in the system according to the invention the light signal is modulated by applying a modulation signal to each of the lasers (2, 9).

REFERENCES:
patent: 3573463 (1971-05-01), Goodwin et al.
patent: 4704741 (1987-11-01), Shikada
patent: 4777664 (1988-10-01), Khoe
patent: 4817206 (1989-05-01), Calvani et al.
patent: 4965857 (1990-10-01), Auracher et al.
Okoshi et al, "Computation of Bit-Error Rate of Various Heterodyne and Coherent-Type Optical Communication Schemes", J of Optical Communications 2(1981)3, 89-96.

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