Reflection-type electro-optic phase modulator

Abstract

The invention provides a reflection-type electro-optic phase modulator. The reflection-type electro-optic phase modulator comprises an electro-optic crystal, optical waveguide and modulation electrodes; the optical waveguide comprises n first light paths and n+1 second light paths, wherein n is greater than or equal to 2; the first light paths are sequentially arranged between a light-in surface and a light-out surface of the electro-optic crystal; the second light paths are connected between the light-out end of the ith first light path and the light-in end of the i+1 first light path, wherein i is equal to 1, 2, ..., n; high-reflection films are arranged at the connecting positions of the first light paths and the second light paths; the modulation electrodes are arranged on the two sides of the first light paths and the second light paths respectively. Compared with the prior art, according to the reflection-type electro-optic phase modulator, multiple Z-shaped light paths are adopted to form the optical waveguide, the action length of the electro-optic phase can be increased under the condition of not increasing the length of the electro-optic phase modulator, and half-wave voltage is lowered. Meanwhile, the structural size of the electro-optic phase modulator can be reduced, integration is easy, and the practicability of the electro-optic phase modulator is improved.

Description

technical field [0001] The invention relates to the technical field of optical waveguide devices, in particular to a reflective electro-optical phase modulator. Background technique [0002] The electro-optic phase modulator is a photoconductive device that modulates the phase of light waves based on the linear electro-optic effect of crystals. For example, the direct waveguide electro-optical phase modulator made of lithium niobate crystal material controls the refractive index of the lithium niobate optical waveguide to change linearly with the applied electric field through the external modulation electric field, so that the phase of the lithium niobate optical waveguide changes with the The external modulation electric field changes to realize the phase modulation of the light wave. [0003] Electro-optic phase modulators play an important role in the fields of optical communication, optical sensing and microwave photonics technology, specifically: [0004] 1. Field of...

AI Technical Summary

Problems solved by technology

[0010] In order to meet the technical requirements of electro-optic phase modulators used in the above fields, the half-wave voltage needs to be reduced as much as possible. At present, the half-wave voltage is usually reduced by increasing the length of the electro-optic phase modulator, but the increase in the length of the optical waveguide is not conducive to electro-optic phase modulation. The production, packaging and application of the device further limit the reduction of the half-wave voltage

Images