Linear reflection-type electro-optic phase modulator

Abstract

The invention provides a linear reflection-type electro-optic phase modulator. The modulator comprises a substrate, an optical waveguide, a modulating electrode, high reflecting film and a circulator,wherein the substrate is rectangular; a linear groove is formed in one side of the substrate, and the optical waveguide with the structure same with that of the linear groove is embedded in the linear groove; the high reflecting film is arranged at one end of the optical waveguide, and the circulator is perpendicularly arranged at the other end; the modulating electrode comprises a positive modulating electrode and a negative modulating electrode which are respectively parallelly arranged at the two sides of the optical waveguide, and phase modulation is achieved; the modulator adopts electro-optical crystal or organic matter as the substrate, and the electrooptical effect of the electro-optical crystal is utilized to change the refractive index of materials so as to achieve the phase modulation; the waveguide end surface of the optical waveguide is coated with the high reflecting film, and light beam reflection is achieved; the positive modulating electrode and the negative modulating electrode are applying and acting passages of a modulating signal; the provided linear reflection-type electro-optic phase modulator can reduce half-wave voltage under the premise of not increasingthe length of the modulator, the modulator size is reduced, the modulator is beneficial for integration, the practicability is good, and actual application value is achieved.

Description

technical field [0001] The invention relates to a modulator, in particular to a linear reflective electro-optic phase modulator. Background technique [0002] Electro-optic phase modulators have important applications in the fields of optical communication, optical sensing, and microwave photonics, and are one of the key devices in these fields. Electro-optic phase modulators are usually implemented based on the linear electro-optic effect (Pockels effect) of crystals. The linear electro-optic effect refers to the effect that the refractive index of the crystal changes proportionally to the applied electric field under the action of an electric field. Currently the most widely used electro-optic phase modulator is a waveguide electro-optic phase modulator made of lithium niobate crystal material. , so as to achieve phase modulation. The lithium niobate waveguide optical phase modulator has the characteristics of simple structure, small size, mature manufacturing process, a...

AI Technical Summary

Problems solved by technology

The traditional straight waveguide phase modulator usually reduces the half-wave voltage by increasing the length of the device, but the increase in the waveguide length is not conducive to the manufacture, packaging and application of the device, which limits the reduction of the half-wave voltage

Moreover, the traditional straight waveguide phase modulator is slightly larger, which is not conducive to integration and mass production

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