A phase shifting device and its working method

Abstract

An embodiment of the invention provides a phase shifting device and an operating method thereof, relates to the field of photo-communication, and aims to improve stability of the phase shifting device. The phase shifting device comprises a micro-ring waveguide, the micro-ring waveguide is arranged on one side of a light transmitting waveguide and used for coupling photosignals from the light transmitting waveguide, and the photosignals are outputted to the light transmitting waveguide after subjected to phase shifting. The phase shifting device further comprises a coupling control portion used for adjusting coupling coefficient of the micro-ring waveguide and the light transmitting waveguide. When the coupling coefficient is larger than the preset value, the micro-ring waveguide shifts phase of the photosignals in the light transmitting waveguide into a first phase; when the coupling coefficient is smaller than the preset value, the micro-ring waveguide shifts the phase of the photosignals in the light transmitting waveguide into a second phase, and the difference of the first phase and the second phase is the odd times of the pi. The phase shifting device can be used in the photological modulation technology.

Description

technical field [0001] The invention relates to the technical field of optical communication, in particular to a phase shifting device and a working method thereof. Background technique [0002] Optical communication plays a pivotal role in modern communication technology, and the silicon-based phase shifter, as the key to realize electrical signal-optical signal conversion, is the core device of silicon-based high-speed modulation. Since the silicon material itself lacks the linear electro-optic effect, the carrier dispersion effect is usually used to realize the modulation of the refractive index to achieve the purpose of phase shifting. Generally, a silicon-based phase shifter can use a resonant cavity with a microring structure. By controlling the voltage applied to the uncoupled region of the microring resonator, the refractive index of the medium can be changed, and by changing the refractive index of the medium of the microring resonator To change the light transmiss...

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Problems solved by technology

[0003] However, in the above-mentioned shift adjustment process, often due to the instability of the voltage applied to the resonator, the adjustment of the refraction index of the resonator medium is unstable, resulting in spectral drift and cannot produce accurate phase shift.

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