Optical waveguides – With optical coupler – Plural
Patent
1996-10-15
1998-10-06
Ngo, John
Optical waveguides
With optical coupler
Plural
385 37, 385 14, 385 45, G02B 626
Patent
active
058189866
ABSTRACT:
An optical planar waveguide wavelength division demultiplexer for separating multiple wavelengths received in a wavelength division multiplexed communication system is disclosed, with each wavelength launched into a separate output waveguide channel. Wavelength separation is performed by wavelength-selective angular back-reflection from Bragg gratings, which are fabricated into the channel junctions of the planar germania-enriched silica waveguide by applying short wavelength light past a mask. A second Bragg reflection, reflecting the same wavelength as the first Bragg grating, is introduced into each output channel circuit, in order to attenuate residual backscattered light at non-desired wavelengths. The Bragg grating is extended beyond the channel junctions into the merged channel for greater reflectivity, if required, for the double Bragg grating geometry. Two planar waveguide geometries are shown: An asymmetric geometry where the output channels merge on either side of a straight input channel, and a symmetric geometry where the input and output channels merge symmetrically with respect to an arbitrary center line.
REFERENCES:
patent: 4740951 (1988-04-01), Lizet et al.
patent: 5064263 (1991-11-01), Stein
patent: 5664032 (1997-09-01), Bischel et al.
Asawa Charles K.
Asawa Jane K.
Asawa Mike H.
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