Guided-wave optical multi/demultiplexer
First Claim
1. A guided-wave optical multi/demultiplexer having directional couplers in both sides of a phase shift region having a difference of optical path length which differs from an integral times a value multiplying an inverse number of an equivalent refractive index to a wavelength λ
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1 by one-half times the value and agrees with an integral times a value multiplying an inverse number of an equivalent refractive index to a wavelength λ
2, and is constructed so that the coupling ratio of light intensity at said wavelength λ
2 is at least 50%, the light in the wave band containing said wavelength λ
1 and the light in the wave band containing said wavelength λ
2 being multiplexed and demultiplexed, wherein;
each of said two directional couplers is constructed so that the coupling ratio of light intensity in said wavelength λ
2 is at least 50% and the coupling ratio of light intensity in said wavelength λ
3 having a wavelength band in close proximity to said wavelength λ
1 is 0% or 100%, the light in the wave band containing said wavelength λ
1 and said wavelength λ
3 and the light in the wave band containing said wavelength λ
2 being multiplexed and demultiplexed.
1 Assignment
0 Petitions
Accused Products
Abstract
A guided-wave optical multi/demultiplexer is capable of providing a wide wavelength band freely. Each of two directional couplers is constructed so that the coupling ratio of light intensity in the wavelength λ2 is at least 50% and the coupling ratio of light intensity in the wavelength λ3 having a wavelength band in close proximity to the wavelength λ1 is 0% or 100%, the light in the wave band containing the wavelength λ1 and the wavelength λ3 and the light in the wave band containing the wavelength λ2 being multiplexed and demultiplexed.
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Citations
10 Claims
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1. A guided-wave optical multi/demultiplexer having directional couplers in both sides of a phase shift region having a difference of optical path length which differs from an integral times a value multiplying an inverse number of an equivalent refractive index to a wavelength λ
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1 by one-half times the value and agrees with an integral times a value multiplying an inverse number of an equivalent refractive index to a wavelength λ
2, and is constructed so that the coupling ratio of light intensity at said wavelength λ
2 is at least 50%, the light in the wave band containing said wavelength λ
1 and the light in the wave band containing said wavelength λ
2 being multiplexed and demultiplexed, wherein;each of said two directional couplers is constructed so that the coupling ratio of light intensity in said wavelength λ
2 is at least 50% and the coupling ratio of light intensity in said wavelength λ
3 having a wavelength band in close proximity to said wavelength λ
1 is 0% or 100%, the light in the wave band containing said wavelength λ
1 and said wavelength λ
3 and the light in the wave band containing said wavelength λ
2 being multiplexed and demultiplexed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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1 by one-half times the value and agrees with an integral times a value multiplying an inverse number of an equivalent refractive index to a wavelength λ
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10. A method of multiplexing and demultiplexing light in a wave band containing a wavelength λ
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1 and light in a wave band containing a wavelength λ
2 using a guided-wave optical multi-demultiplexer in which two guided-wave paths are provided on a substrate, said two guided-wave paths being placed in proximity to each other with a given gap therebetween and in parallel to each other along a given length in two positions to form two directional couplers, at least one of said guided-wave paths being by-passed between said two positions to form a directional coupler, wherein;said two directional couplers are constructed so that the coupling ratio of light intensity at said wavelength λ
2 is 50% and the coupling ratio of light intensity at said wavelength λ
3 having a wavelength band in close proximity to said wavelength λ
1 is 0% or 100% the light in the wave band of 1.3 μ
m containing said wavelength λ
1 and said wavelength λ
3 and the light in the wave band of 1.55 μ
m containing said wavelength λ
2 being multiplexed and demultiplexed.
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1 and light in a wave band containing a wavelength λ
Specification