Guided-wave optical multi/demultiplexer
First Claim
Patent Images
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.
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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.
203 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
-
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
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Current AssigneeHitachi Cable Limited (Proterial Ltd.)
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Original AssigneeHitachi Cable Limited (Proterial Ltd.)
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InventorsArai, Hideaki, Uetsuka, Hisato
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Primary Examiner(s)Ullah, Akm E.
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Application NumberUS08/403,263Time in Patent Office365 DaysField of Search385/14, 385/15, 385/16, 385/39, 385/40, 385/130, 385/131, 385/132, 385/24, 385/27, 385/21, 385/30, 385/31, 385/18, 359/126, 359/152, 359/127, 359/900, 359/114, 359/115, 359/117US Class Current385/27CPC Class CodesG02B 6/12007 forming wavelength selectiv...G02B 6/29352 in a light guideG02B 6/2938 for multiplexing or demulti...
