Optical duplexer for bidirectional optical information transmiss

Details Optical duplexer for bidirectional optical information transmiss Optical duplexer for bidirectional optical information transmiss

1993-05-03

1994-03-15

Chilcot, Jr., Richard E.

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359116, 359152, 359113, 385 24, 385 41, 385 47, H04B 1024, H04B 1000

Patent

active

052950115

ABSTRACT:
Optical duplexer for bidirectional optical information transmission. In the optical duplexer for bidirectional information transmission, a phase difference is produced between two optical waves reflected back to the duplexer on different optical paths for reducing a near-end crosstalk while avoiding the generation of a difference in path length between the two paths. Provided is a device for controlling the phase of an optical wave reflected back into the duplexer on one of the two paths or provided are two paths having a difference in optical wavelength produced by a difference in refractive index. In particular, it is beneficial to set or fix the phase difference between the optical waves reflected back into the duplexer on the two paths to .pi./2. The optical coupler is advantageously utilized in bidirectional information transmission.

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GaInAsP/InP Zero-Gap Directional Couplers As Compact Optical WDM Filters, Electronics Ltrs. Aug. 17, 1989 vol. 25, No. 17 pp. 1180-1181.

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