Polarization selective semiconductor laser, optical transmitter using the same, optical communication system using the same and fabrication method of the same
First Claim
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1. A semiconductor laser capable of switching a polarization mode of output light, said laser comprising:
- a first semiconductor laser structure, a gain for a first polarization mode being larger than a gain for a second polarization mode in said first semiconductor laser structure; and
a second semiconductor laser structure, a gain for the second polarization mode being larger than a gain for the first polarization mode in said second semiconductor laser structure;
wherein said first semiconductor laser structure and said second semiconductor laser structure are arranged with a spacing therebetween in a light waveguide direction.
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Abstract
A semiconductor laser capable of controlling a polarization mode of output light is disclosed. In a fabrication method of the laser, after two laser portions are independently formed, the laser portions are positioned to be optically coupled to each other. In another fabrication method of the laser, after at least portions of two laser portions are separately formed, an irregularly-formed portion at a boundary portion therebetween is removed. The fabrication method can be facilitated and a degree of freedom in the polarization control can be increased, since the two laser portions are separately formed.
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Citations
96 Claims
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1. A semiconductor laser capable of switching a polarization mode of output light, said laser comprising:
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a first semiconductor laser structure, a gain for a first polarization mode being larger than a gain for a second polarization mode in said first semiconductor laser structure; and a second semiconductor laser structure, a gain for the second polarization mode being larger than a gain for the first polarization mode in said second semiconductor laser structure; wherein said first semiconductor laser structure and said second semiconductor laser structure are arranged with a spacing therebetween in a light waveguide direction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A semiconductor laser capable of switching a polarization mode of output light, said laser comprising:
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a first semiconductor laser array, said first semiconductor laser array including a plurality of first semiconductor laser structures arranged in a parallel manner, and a gain for a first polarization mode being larger than a gain for a second polarization mode in each of said first semiconductor laser structures; and a second semiconductor laser array, said second semiconductor laser array including a plurality of second semiconductor laser structures arranged in a parallel manner, and a gain for the second polarization mode being larger than a gain for the first polarization mode in each of said second semiconductor laser structures; wherein said first semiconductor laser array and said second semiconductor laser array are arranged with a spacing therebetween, and said first semiconductor laser structure and said second semiconductor laser structure, corresponding to each other, are arranged with a spacing therebetween in a light waveguide direction. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58)
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59. A semiconductor laser capable of switching a polarization mode of output light, comprising:
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a first semiconductor laser array, said first semiconductor laser array including a plurality of first semiconductor laser structures arranged in a parallel manner, and a gain for a first polarization mode being larger than a gain for a second polarization mode in each of said first semiconductor laser structures; and a second semiconductor laser array, said second semiconductor laser array including a plurality of second semiconductor laser structures arranged in a parallel manner, and a gain for the second polarization mode being larger than a gain for the first polarization mode in each of said second semiconductor laser structures; wherein the plurality of said first semiconductor laser structures in said first semiconductor laser array respectively correspond to the plurality of said second semiconductor laser structures in said second semiconductor laser array. - View Dependent Claims (60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80)
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81. An optical transmitter for transmitting an optical signal, said transmitter comprising:
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a semiconductor laser capable of switching a polarization mode of output light, said laser including; a first semiconductor laser structure, a gain for a first polarization mode being larger than a gain for a second polarization mode in said first semiconductor laser structure; and a second semiconductor laser structure, a gain for the second polarization mode being larger than a gain for the first polarization mode in said second semiconductor laser structure; wherein said first semiconductor laser structure and said second semiconductor laser structure are arranged with a spacing therebetween in a light waveguide direction; and a control circuit for modulating the polarization mode of the output light of said semiconductor laser in accordance with a signal to be transmitted. - View Dependent Claims (82, 83)
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84. An optical transmitter for transmitting an optical signal, said transmitter comprising:
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a semiconductor laser capable of switching a polarization mode of output light, said laser including; a first semiconductor laser array, said first semiconductor laser array including a plurality of first semiconductor laser structures arranged in a parallel manner, and a gain for a first polarization mode being larger than a gain for a second polarization mode in each of said first semiconductor laser structures; and a second semiconductor laser array, said second semiconductor laser array including a plurality of second semiconductor laser structures arranged in a parallel manner, and a gain for the second polarization mode being larger than a gain for the first polarization mode in each of said second semiconductor laser structures; wherein said first semiconductor laser array and said second semiconductor laser array are arranged with a spacing therebetween, and said first semiconductor laser structure and said second semiconductor laser structure, corresponding to each other, are arranged with a spacing therebetween in a light waveguide direction; and a control circuit for modulating the polarization modes of the output light of said semiconductor laser in accordance with signals to be transmitted. - View Dependent Claims (85, 86)
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87. An optical transmitter for transmitting an optical signal, said transmitter comprising:
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a first semiconductor laser array, said first semiconductor laser array including a plurality of first semiconductor laser structures arranged in a parallel manner, and a gain for a first polarization mode being larger than a gain for a second polarization mode in each of said first semiconductor laser structures; and a second semiconductor laser array, said second semiconductor laser array including a plurality of second semiconductor laser structures arranged in a parallel manner, and a gain for the second polarization mode being larger than a gain for the first polarization mode in each of said second semiconductor laser structures; wherein the plurality of said first semiconductor laser structures in said first semiconductor laser array respectively correspond to the plurality of said second semiconductor laser structures in said second semiconductor laser array; and a control circuit for modulating the polarization modes of the output light of said semiconductor laser in accordance with signals to be transmitted. - View Dependent Claims (88)
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89. An optical communication system for transmitting information using an optical signal, said system comprising:
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(a) an optical transmitter for transmitting an optical signal, said transmitter including; a semiconductor laser capable of switching a polarization mode of output light, said laser including; a first semiconductor laser structure, a gain for a first polarization mode being larger than a gain for a second polarization mode in said first semiconductor laser structure; and a second semiconductor laser structure, a gain for the second polarization mode being larger than a gain for the first polarization mode in said second semiconductor laser structure; wherein said first semiconductor laser structure and said second semiconductor laser structure are arranged with a spacing therebetween in a light waveguide direction; and a control circuit for modulating the polarization mode of the output light of said semiconductor laser in accordance with a signal to be transmitted; and (b) an optical receiver for receiving the optical signal transmitted by said optical transmitter. - View Dependent Claims (90, 91)
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92. An optical communication system for transmitting information using an optical signal, said system comprising:
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(a) an optical transmitter for transmitting an optical signal, said transmitter including; a semiconductor laser capable of switching a polarization mode of output light, said laser including; a first semiconductor laser array, said first semiconductor laser array including a plurality of first semiconductor laser structures arranged in a parallel manner, and a gain for a first polarization mode being larger than a gain for a second polarization mode in each of said first semiconductor laser structures; and a second semiconductor laser array, said second semiconductor laser array including a plurality of second semiconductor laser structures arranged in a parallel manner, and a gain for the second polarization mode being larger than a gain for the first polarization mode in each of said second semiconductor laser structures; wherein said first semiconductor laser array and said second semiconductor laser array are arranged with a spacing therebetween, and said first semiconductor laser structure and said second semiconductor laser structure, corresponding to each other, are arranged with a spacing therebetween in a light waveguide direction; and a control circuit for modulating the polarization modes of the output light of said semiconductor laser in accordance with signals to be transmitted; and (b) an optical receiver for receiving the optical signal transmitted by said optical transmitter. - View Dependent Claims (93, 94)
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95. An optical communication system for transmitting information using an optical signal, said system comprising:
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(a) an optical transmitter for transmitting an optical signal, said transmitter including; a first semiconductor laser array, said first semiconductor laser array including a plurality of first semiconductor laser structures arranged in a parallel manner, and a gain for a first polarization mode being larger than a gain for a second polarization mode in each of said first semiconductor laser structures; and a second semiconductor laser array, said second semiconductor laser array including a plurality of second semiconductor laser structures arranged in a parallel manner, and a gain for the second polarization mode being larger than a gain for the first polarization mode in each of said second semiconductor laser structures; wherein the plurality of said first semiconductor laser structures in said first semiconductor laser array respectively correspond to the plurality of said second semiconductor laser structures in said second semiconductor laser array; and a control circuit for modulating the polarization modes of the output light of said semiconductor laser in accordance with signals to be transmitted; and (b) an optical receiver for receiving the optical signal transmitted by said optical transmitter. - View Dependent Claims (96)
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Specification