3 Fibre I and Q coupler

Details 3 Fibre I and Q coupler 3 Fibre I and Q coupler

2005-02-22

2005-02-22

Glick, Edward J. (Department: 2882)

Optical waveguides

With optical coupler

Particular coupling structure

C385S046000

Reexamination Certificate

active

06859586

ABSTRACT:
An optical coupler10comprising at least three fibres12, 14and16, portions of the fibres being fused to each other to form a coupling region30operable to couple light therebetween. At least two of the fibres have inputs18and/or20and/or22and at least two of the fibres have outputs24and/or26and/or28. In use, on illumination of at least two of the inputs light intensity is emitted from a plurality of the outputs having a substantially asymmetric phase relationship, such as, for example, a quadrature phase relationship between two of the outputs. The invention also provides for methods of making such a device.

REFERENCES:
patent: 4514054 (1985-04-01), Stowe
patent: 5170450 (1992-12-01), Dahlgren
patent: 5459804 (1995-10-01), Stowe
patent: 5581641 (1996-12-01), Travis et al.
patent: 6049645 (2000-04-01), Pan et al.
van Deventer, “Phase-Diversity Hybrid Optimization in Case of a Two-Detector Receiver,” IEEE Photonics Technology Letters, vol. 4, No. 9, pp. 1060-1062, Sep. 1, 1992.
Davis, “Phase Diversity Techniques for Coherent Optical Receivers,” Journal of Lightwave Technology, vol. LT-5, No. 4, 4/87, pp. 561-572.
Kazovsky, “All-fiber 90 Optical Hybrid for Coherent Communications,” Applied Optics, vol. 26, No. 3, Feb. 1, 1987, pp. 437-439.

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