Optical hybrid with 3.times.3 coupling device

Details Optical hybrid with 3.times.3 coupling device Optical hybrid with 3.times.3 coupling device

1993-05-13

1996-02-13

Lee, John D.

Optical waveguides

With optical coupler

Plural

385 17, 385 39, G02B 626

Patent

active

054917638

ABSTRACT:
In known coherent optical receivers comprising two detectors, optical 90.degree. hybrids have a `throughput` .ltoreq.25%. Theoretical analysis reveals that a higher `throughput` of up to a maximum of approximately 29.3% is possible. The invention provides such a 90.degree. hybrid (30) of the coupler type with the aid of a 2.times.2 port which is based on a loss-free 3.times.3 directional coupler having the maximum throughput ratios between two of the inputs (31/39, 32/40) and two of the outputs (39/34, 40/35) and the 90.degree. phase difference between said two outputs, the third input and the third output not being used. An integrated version employing indium phosphide is described.

REFERENCES:
patent: 4732447 (1988-03-01), Wright et al.
patent: 4755016 (1988-07-01), DeLoach, Jr. et al.
patent: 4932735 (1990-06-01), Koai
patent: 5058101 (1991-10-01), Albanese et al.
Y. Wang et al, "A 90.degree. optical fiber hybrid for optimal signal power utilization", Oct. 1, 1987, pp. 4181-4184, Applied Optics, vol. 26, No. 19.
L. G. Kazovsky, "Phase- and Polarization-Diversity Coherent Optical Techniques", Feb. 1989, pp. 279-292, Journal of Lightwave Technology, vol. 7, No. 2.
L. G. Kazovsky et al, "All-fiber 90.degree. optical hybrid for coherent communications", Feb. 1, 1987, pp. 437-439, Applied Optics, vol. 26, No. 3.

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