Optical coherent receiver

Details Optical coherent receiver Optical coherent receiver

1992-01-31

1994-06-28

Chilcot, Jr., Richard E.

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359191, 359195, H04B 1006

Patent

active

053252268

ABSTRACT:
An optical coherent receiver including apparatus for preventing radiation from the local oscillator (40) from being reflected in the transmission fibre (10). As a result this radiation, after reflection on imperfect couplings (11, 12, 13) in the transmission fibre, is prevented from reaching the receiver again and from detrimentally influencing the received signal. Reflection of local oscillator radiation is prevented by obliquely polishing entrance and exit faces of fibres (51, 52, 61, 62), by providing anti-reflection coatings (50', 60', 53', 54', 63', 64') on the appropriate faces and by arranging an optical isolator behind the input (20) of the coherent receiver.

REFERENCES:
patent: 4596052 (1986-06-01), Wright et al.
patent: 4615581 (1986-10-01), Morimoto
patent: 4704741 (1987-11-01), Shikada
patent: 4718121 (1988-01-01), Epworth
patent: 4759080 (1988-07-01), Emura et al.
patent: 4868897 (1989-09-01), von Helmolt
patent: 4900917 (1990-02-01), Dixon et al.

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