Polarization insensitive wavelength multiplexing 2.times.2 fibre

Details Polarization insensitive wavelength multiplexing 2.times.2 fibre Polarization insensitive wavelength multiplexing 2.times.2 fibre

1994-04-05

1995-04-18

Gonzalez, Frank

Optical waveguides

With optical coupler

Particular coupling structure

385 15, 385 11, 385 48, 385 96, 65501, 65438, G02B 626

Patent

active

054085551

ABSTRACT:
In the manufacture of a wavelength multiplexing 2.times.2 tapered fused fiber coupler by progressive stretching, the birefringence of the coupler resulting from the progressive stretching is subsequently nulled-out by elastic twisting of the coupler. The progressive stretching is performed, under temperature conditions providing a profile in the coupling region of the coupler having the property that the coupling strength for one of the principal polarization planes of the coupler remains substantially constant during said elastic twisting.

REFERENCES:
patent: Re33296 (1990-08-01), Stowe et al.
patent: 4591372 (1986-05-01), Bricheno et al.
patent: 4612028 (1986-09-01), Abebe et al.
patent: 4801185 (1989-01-01), Bricheno
Wilkinson, "Close-Spaced Fused Fibre Wavelength Division Multiplexers With Very Low Polarisation Sensitivity", Electronics Letters, vol. 26, No. 6, pp. 382-384, Mar. 15, 1990.
Boucouvalas, "Methods For Fine-Tuning The Wavelength Response of Single-Mode Optical-Fibre Taper Filters," Electronics Letters, vol. 23, No. 8, pp. 410-411, Apr. 9, 1987.
Wilkinson, "Control of Polarisation Degradation in Fibre Amplifier WDMS", Electronic Letters, vol. 29, No. 2, pp. 214-215, Jan 21, 1993.
Birks, "Twist-Induced Tuning In Tapered Fibre Couplers", Applied Optics, vol. 28, No. 19, pp. 4226-4233, Oct. 1, 1989.
O'Sullivan, "Control of Polarisation Degradation in Fibre Amplifier WDMS", Electronics Letters, vol. 28, No. 17, pp. 1616-1618, Aug. 13, 1992.

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