OPTICAL RECEIVER CIRCUIT AND ADJUSTMENT METHOD FOR SAME
First Claim
1. An optical receiver circuit comprising:
- a substrate; and
an optical waveguide device that is formed on the substrate, wherein the optical waveguide device comprises;
a first optical splitter section in which signal light propagates, the first optical splitter section branching the signal light into a first signal light propagation waveguide and a second signal light propagation waveguide and;
a second optical splitter section in which local-oscillator light propagates, the second optical splitter section branching the local-oscillator light into a first local-oscillator light propagation waveguide and a second local-oscillator light propagation waveguide;
a first optical coupler section that combines the signal light propagating through the first signal light propagation waveguide and the local-oscillator light propagating through the first local-oscillator light propagation waveguide with each other, and makes the signal light and the local-oscillator light interfere with each other;
a second optical coupler section that combines the signal light propagating through the second signal light propagation waveguide and the local-oscillator light propagating through the second local-oscillator light propagation waveguide with each other, and makes the signal light and the local-oscillator light interfere with each other;
at least one first optical receiver unit that receives output light from the first optical coupler section;
at least one second optical receiver unit that receives output light from the second optical coupler section; and
a phase adjustment unit that is arranged in at least one of the first local-oscillator light propagation waveguide and the second local-oscillator light propagation waveguide, whereinthe first optical splitter section and the second optical splitter section are disposed so that a propagation direction of the local-oscillator light in the second optical splitter section is set to be a direction opposite to a propagation direction of the signal light in the first optical splitter section, whereinthe first optical coupler section and the second optical coupler section are disposed so that a propagation direction of the output light in the second optical coupler section is set to be a direction same as a propagation direction of the output light in the first optical coupler section, and whereinall waveguides for propagating at least one of the signal light and the local-oscillator light in the optical waveguide device are arranged so as not to overlap with each other with respect to the substrate when seen in a plan view.
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Accused Products
Abstract
An optical receiver circuit includes: a substrate; and an optical waveguide device that is formed on the substrate. The optical waveguide device includes: a first optical splitter section branching the signal light into a first signal light propagation waveguide and a second signal light propagation waveguide and; a second optical splitter section branching the local-oscillator light into a first local-oscillator light propagation waveguide and a second local-oscillator light propagation waveguide; a first optical coupler section that combines the signal light propagating through the first signal light propagation waveguide and the local-oscillator light propagating through the first local-oscillator light propagation waveguide with each other; a second optical coupler section that combines the signal light propagating through the second signal light propagation waveguide and the local-oscillator light propagating through the second local-oscillator light propagation waveguide with each other.
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Citations
15 Claims
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1. An optical receiver circuit comprising:
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a substrate; and an optical waveguide device that is formed on the substrate, wherein the optical waveguide device comprises; a first optical splitter section in which signal light propagates, the first optical splitter section branching the signal light into a first signal light propagation waveguide and a second signal light propagation waveguide and; a second optical splitter section in which local-oscillator light propagates, the second optical splitter section branching the local-oscillator light into a first local-oscillator light propagation waveguide and a second local-oscillator light propagation waveguide; a first optical coupler section that combines the signal light propagating through the first signal light propagation waveguide and the local-oscillator light propagating through the first local-oscillator light propagation waveguide with each other, and makes the signal light and the local-oscillator light interfere with each other; a second optical coupler section that combines the signal light propagating through the second signal light propagation waveguide and the local-oscillator light propagating through the second local-oscillator light propagation waveguide with each other, and makes the signal light and the local-oscillator light interfere with each other; at least one first optical receiver unit that receives output light from the first optical coupler section; at least one second optical receiver unit that receives output light from the second optical coupler section; and a phase adjustment unit that is arranged in at least one of the first local-oscillator light propagation waveguide and the second local-oscillator light propagation waveguide, wherein the first optical splitter section and the second optical splitter section are disposed so that a propagation direction of the local-oscillator light in the second optical splitter section is set to be a direction opposite to a propagation direction of the signal light in the first optical splitter section, wherein the first optical coupler section and the second optical coupler section are disposed so that a propagation direction of the output light in the second optical coupler section is set to be a direction same as a propagation direction of the output light in the first optical coupler section, and wherein all waveguides for propagating at least one of the signal light and the local-oscillator light in the optical waveguide device are arranged so as not to overlap with each other with respect to the substrate when seen in a plan view. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification