Double diffraction grating planar lightwave circuit
First Claim
1. A planar lightwave circuit wavelength division multiplexer/demultiplexer device comprising:
- a slab waveguide defining first and second slab regions connected by a gap;
first and second face to face concave reflective diffraction gratings on either end of the slab waveguide;
a first waveguide extending to the first slab region;
a second waveguide extending to the first slab region; and
a third waveguide extending to the second slab region;
wherein the first and second reflective gratings and the ends of the first, second and third waveguides are positioned, whereby light of a wavelength in a first range of wavelengths will pass between the first and second waveguides via the first grating, and whereby light of a wavelength in a second range of wavelengths, higher or lower than the first range of wavelengths, will pass between the first and third waveguides via the first and the second grating.
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Abstract
The invention relates to a planar lightwave circuit including a pair of opposed concave reflective diffraction gratings sharing the same focal line, which separates first and second slab waveguide regions. The ends of input and output waveguides are positioned along the focal line for launching and receiving light directed by one or both of the diffraction gratings. The invention enables light within in a certain wavelength range to be launched from an input waveguide, directed by a single diffraction grating, and output waveguides, all within a single slab waveguide region, while light within another wavelength range will be directed from one diffraction grating to another for output waveguides in a different slab waveguide region.
17 Citations
20 Claims
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1. A planar lightwave circuit wavelength division multiplexer/demultiplexer device comprising:
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a slab waveguide defining first and second slab regions connected by a gap;
first and second face to face concave reflective diffraction gratings on either end of the slab waveguide;
a first waveguide extending to the first slab region;
a second waveguide extending to the first slab region; and
a third waveguide extending to the second slab region;
wherein the first and second reflective gratings and the ends of the first, second and third waveguides are positioned, whereby light of a wavelength in a first range of wavelengths will pass between the first and second waveguides via the first grating, and whereby light of a wavelength in a second range of wavelengths, higher or lower than the first range of wavelengths, will pass between the first and third waveguides via the first and the second grating. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification