Optical waveguides – With optical coupler – Permanently fixed coupler
Patent
1991-06-12
1992-06-09
Lee, John D.
Optical waveguides
With optical coupler
Permanently fixed coupler
385 43, 385 50, G02B 626
Patent
active
051214539
ABSTRACT:
The invention provides a method for fabricating a polarization independent narrow channel wavelength division multiplexing fiber optic coupler, comprising the steps of: holding two optical fibers in an abutting longitudinal relation along a predetermined length of the fibers; injecting light energy into one of the fibers; fusing the optical fibers together along the predetermined length to form a fused length of a fiber optic coupler; elongating the fused length of the fusing optical fibers; measuring the light energy output from the ends of the first and second fibers; ceasing the fusing and elongating when the measured light energy output from the ends of the first and second fibers indicates that a predetermined number, N.sub.S, of one-half power transfer cycles have occurred in the coupler, where the N.sub.S th one-half power transfer cycle occurs within a K.pi. phase region of a polarization envelope associated with the coupler, where K is a positive integer.
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"Polarization Independent Narrow Channel Wavelength Division Multiplexing ber Couplers for 1.55 m" by Matthew N. McLandrich et al., Journal of Lightwave Technology, vol. 9, No. 4, Apr. 1991.
"Single-Mode Fused Biconical Couplers for Wavelength Division Multiplexing with Channel Spacing Between 100 and 300 nm", Journal of Lightwave Tech. Jan./1988.
McLandrich Matthew N.
Orazi Richard J.
Fendelman Harvey
Heartney Phan T.
Kagan Michael A.
Keough Thomas Glenn
Lee John D.
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