Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1987-12-28
1989-09-19
Griffin, Robert L.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
455612, 455616, 455617, H04B 900
Patent
active
048688975
ABSTRACT:
An optical network, particularly fashioned as a homodyne or heterodyne receiver wherein a local oscillator (2) of an optical homodyne or heterodyne receiver comprising an optical wave guide network (1) is isolated from generally anisotropic reflections from the network (1) in order to preserve the stability and tunability of the oscillator (2) and a polarization filter (10), a polarization converter (11) and a phase shifter (12) are successively arranged in the direction of the outgoing optical wave in the beam path of the wave emitted by the oscillator (2) and reflected by the network (1) for optical homodyne or heterodyne reception.
REFERENCES:
patent: 4730301 (1988-03-01), McMahon
patent: 4752120 (1988-06-01), Shimizu
patent: 4775971 (1988-10-01), Bergmann
Booth et al, "Temperature Tuning of LiNbO.sub.3 Electro-Optic Waveguide TE/TM Mode Convertors", Electronic Letters, vol. 20, No. 25/26, Dec. 6, 1984, pp. 1045-1047.
Hindin, "Integration is on the Way for Fiber Optic Receivers", Electronics, Oct. 9, 1980, pp. 155-160.
Beek Leslie Van
Griffin Robert L.
Siemens Aktiengesellschaft
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