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US 9,519,115 B2Granted
Optical circuit
AssigneePhotonics Electronics Technology Research Association
InventorsKenichiro Yashiki, Masatoshi Tokushima
Life of this patent
Estimating the term…
Abstract
An optical circuit, wherein the effects of reflected light generated by an optical component are reduced. The optical circuit (100) is provided with an optical branching (110) for branching light, an optical coupler (114) for coupling a first portion of branched light to an optical waveguide (118) for transmission, and an optical reflecting unit (116) for reflecting a second portion of the branched light, the phase difference between the reflected light from the optical coupler (114) and the reflected light from the optical reflecting unit (116) being (2m−1)π (where m is an integer) on an input side of the optical branching (110).
Claims17
An optical circuit comprising:
- a first branching part configured to branch light;
- a first optical coupler configured to couple first branched light in the branched light to a first optical waveguide for transmission;
- and
- an optical reflection part configured to reflect second branched light in the branched light;
- wherein, at an input side of the first branching part, a phase difference between reflected light from the first optical coupler and reflected light from the optical reflection part is (2m−1)π, wherein m is an integer, and
- wherein the optical reflection part is a second optical coupler, and diffracted light from the first optical coupler and diffracted light from the second optical coupler are both transmitted to the first optical waveguide.
3 more elements
An optical circuit comprising:
- a first branching part configured to branch light;
- a first optical coupler configured to couple first branched light in the branched light to a first optical waveguide for transmission;
- an optical reflection part configured to reflect second branched light in the branched light;
- a light source;
- a second branching part configured to branch light emitted from the light source;
- a first optical modulator configured to modulate a first part of light from the second branching part and output a modulated optical signal;
- and
- a second optical modulator configured to modulate a second part of the light from the second branching part and output a modulated optical signal;
- wherein, at an input side of the first branching part, a phase difference between reflected light from the first optical coupler and reflected light from the optical reflection part is (2m−1)π, wherein m is an integer, and
- wherein, at an input side of the second branching part, a phase difference between reflected light from the first optical modulator and reflected light from the second optical modulator is (2m−1)π, wherein m is an integer.
7 more elements
An optical circuit comprising:
- a first branching part configured to branch light;
- a first optical coupler configured to couple first branched light in the branched light to a first optical waveguide for transmission;
- and
- an optical reflection part configured to reflect second branched light in the branched light;
- wherein, at an input side of the first branching part, a phase difference between reflected light from the first optical coupler and reflected light from the optical reflection part is (2m−1)π, wherein m is an integer,
- wherein, regarding the first branching part comprising the 1×2 construction comprising a branching construction in which one input is provided and no phase differences between phases at two output sides are generated, an optical path length between the first branching part and the first optical coupler and an optical path length between the first branching part and the optical reflection part are the same;
- and a phase difference between a phase of light reflected from the first optical coupler at an incident end of the first optical coupler and a phase of light reflected from the optical reflection part at an incident end of the optical reflection part is (2m−1)π, wherein m is an integer, and
- wherein the optical circuit is formed on a same substrate;
- the first optical coupler and the optical reflection part comprise a first grating coupler and a second grating coupler, respectively;
- and pitches of gratings of the first grating coupler and the second grating coupler are determined in such a manner that detuning for the first grating coupler is made to be δ=κ and detuning for the second grating coupler is made to be δ=−κ, wherein κ is a coupling constant, δ=β−K, β is a propagation coefficient of light, K=2π/Λ, and Λ is a grating pitch.
7 more elements
Dependencies are inferred from the claim text.