Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1993-06-09
1995-10-10
Pascal, Leslie
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
H04B 1006
Patent
active
054575630
ABSTRACT:
An optical mixing device having intensity-noise suppression, for use in a heterodyne receiver, comprises a coupler (31) having two optical input ports (32, 33) for a received signal (E.sub.S) and a local oscillator signal (E.sub.L), respectively, and two optical output ports (34, 35). An optical path-length difference is created between light signals emerging from the two output ports (34, 35) and a photodetector (36), and the light signals are fed from the output ports (34, 35) to the photodetector (36) in separate beams. The mixing device has a simple optical fiber construction and does not require polarization-influence devices. A coherent heterodyne receiver is also provided which includes the optical mixing device.
REFERENCES:
patent: 4506388 (1985-03-01), Monerie
patent: 4723316 (1988-02-01), Glance
patent: 4916705 (1988-04-01), Glance
patent: 5023950 (1989-01-01), Tsushima
C. J. Mahon, et al, "Relative Intensity Noise Suppression with High-Birefringence Fibre in a 2.5 GBit/s CP-FSK Optical Communication System with Heterodyne Receiver", IOOC-ECOC 1991, Paris, Sep. 9-12, 1991, pp. 473-476.
Koninklijke PTT Nederland N.V.
Pascal Leslie
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