Optical receiving chip

Abstract

The invention provides an optical receiving chip. The optical receiving chip comprises an input coupling unit, a polarization rotation unit, a photoelectric detection unit, a first transmission waveguide and a second transmission waveguide; an optical signal has input TE polarized light and / or input TM polarized light; the polarization rotation unit can rotate the input TE polarized light by 90 degrees to convert the input TE polarized light into output TM polarized light, and can rotate the input TM polarized light by 90 degrees to convert the input TM polarized light into output TE polarizedlight; the first transmission waveguide is used for transmitting the input TE polarized light and / or the input TM polarized light from the input coupling unit to the polarization rotation unit; the second transmission waveguide is used for transmitting the output TE polarized light and / or the output TM polarized light from the polarization rotation unit to the photoelectric detection unit; and the total length of the first transmission waveguide is equal to the total length of the second transmission waveguide. The optical receiving chip provided by the invention can realize polarization-independent optical signal receiving.

Description

technical field [0001] The present application relates to the technical field of semiconductor integration, in particular to a light receiving chip. Background technique [0002] In the prior art, the optical signal is transmitted to the photodetector of the optical receiving chip through the waveguide in the optical receiving chip, and the photodetector converts the incident optical signal into an electrical signal. The usual problems of the optical receiving chip in the prior art are Since the received optical signals have different polarization states, the group refractive index of light with different polarization states in the same waveguide is often different, that is, the time delay of optical signals with different polarization states is different, resulting in signal distortion. Contents of the invention [0003] In view of this, the embodiment of the present application expects to provide a light receiving chip that can avoid the problem of signal distortion due ...

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Problems solved by technology

[0002] In the prior art, the optical signal is transmitted to the photodetector of the optical receiving chip through the waveguide in the optical receiving chip, and the photodetector converts the incident optical signal into an electrical signal. The usual problems of the optical receiving chip in the prior art are Since the received optical signals have different polarization states, the group refractive index of light with different polarization states in the same waveguide is often different, that is, the time delay of optical signals with different polarization states is different, resulting in signal distortion

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