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US 10,948,655 B2Granted
Optical coupling apparatus and control method thereof
AssigneeHuawei Technologies Co., Ltd.
InventorsShupeng Deng, Lei Liu, Chi Yan Wong
Life of this patent
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Abstract
An optical coupling apparatus includes: a coupling and polarization beamsplitter, a phase shifter, a 2×2 adjustable beamsplitter, a photoelectric detector, and a microprocessor. Light in any polarization direction can be coupled from an optical fiber into a waveguide, an extra insertion loss is small, intrinsic insertion losses for light in different polarization directions are the same, a structure is simple, and miniaturization is easy to be implemented.
Claims13
An optical coupling apparatus, comprising:
- a coupling and polarization beamsplitter, a phase shifter, a 2×2 adjustable beamsplitter, a photoelectric detector, and a microprocessor, wherein
- the coupling and polarization beamsplitter is configured to:
- couple light from an optical fiber into a waveguide, and perform polarization beam splitting and rotation to obtain a first transverse electric (TE) polarized beam and a second TE polarized beam, the first TE polarized beam and the second TE polarized beam having a phase difference, wherein a ratio of intensity of the first TE polarized beam to intensity of the second TE polarized beam is a1:a2;
- the phase shifter is coupled between the coupling and polarization beamsplitter and the 2×2 adjustable beamsplitter, and the phase shifter is configured to adjust the phase difference between the first TE polarized beam and the second TE polarized beam based on a working voltage of the phase shifter;
- the 2×2 adjustable beamsplitter is configured to:
- adjust a split ratio based on a working voltage of the 2×2 adjustable beamsplitter, and perform beam combination processing on the first TE polarized beam and the second TE polarized beam based on the split ratio to obtain a first output and a second output;
- the photoelectric detector is coupled between the 2×2 adjustable beamsplitter and the microprocessor, and the photoelectric detector is configured to:
- detect a working current of the first output, and send the working current to the microprocessor;
- and
- the microprocessor is configured to adjust the working voltage of the phase shifter and the working voltage of the 2×2 adjustable beamsplitter based on the received working current.
7 more elements
A control method for an optical coupling apparatus, the method comprising:
- coupling, by a coupling and polarization beamsplitter, light from an optical fiber into a waveguide, and performing polarization beam splitting and rotation to obtain a first TE polarized beam and a second TE polarized beam, the first TE polarized beam and the second TE polarized beam having a phase difference, wherein a ratio of intensity of the first TE polarized beam to intensity of the second TE polarized beam is a1:a2, and wherein the optical coupling apparatus comprises the coupling and polarization beamsplitter, a phase shifter, a 2×2 adjustable beamsplitter, a photoelectric detector, and a microprocessor;
- adjusting, by the phase shifter, the phase difference between the first TE polarized beam and the second TE polarized beam based on a working voltage of the phase shifter;
- adjusting, by the 2×2 adjustable beamsplitter, a split ratio based on a working voltage of the 2×2 adjustable beamsplitter, and performing beam combination processing on the first TE polarized beam and the second TE polarized beam based on the split ratio, to obtain a first output and a second output;
- detecting, by the photoelectric detector, a working current of the first output, and sending the working current to the microprocessor;
- adjusting, by the microprocessor, the working voltage of the phase shifter and the working voltage of the 2×2 adjustable beamsplitter based on the received working current.
2 more elements
A control method, and the method comprising:
- receiving, by a microprocessor, a working current of a first output detected by the photoelectric detector, wherein the first output is one of two outputs obtained from a 2×2 adjustable beamsplitter;
- and
- adjusting, by the microprocessor, a working voltage of the phase shifter and a working voltage of the 2×2 adjustable beamsplitter based on the working current.
Dependencies are inferred from the claim text.