Polarization irrelevant crystal electro optic modulator based on two-sided metallic reflection

Abstract

The present invention discloses an electro optic modulator based on two-sided metallic reflection type polarization independent crystal, wherein, the top and bottom surface of the crystal wave guide layer is adhered with an upper and a lower metallic electrodes, the crystal wave guide layer and the adhered upper and lower metallic electrodes jointly consist a wave-guide structure, an input matching circuit is connected with the upper layer metallic electrode and the lower layer metallic electrode; the incident carrier light forms a focused beam after focusing, and then the focused beam is incident onto the wave-guide structure, reflecting by the upper layer metallic electrode; a modulation electrical signal is added between the upper layer metallic electrode and the lower layer metallic electrode by the input matching circuit, the modulating signal changes the reflection index at the work corner by changing the refractivity of the wave guide layer, thereby implementing the modulation of intensity of reflected light. The invention has a polarization independent characteristic, and has a low requirement to the electro-optic coefficient of the wave guide layer crystal. At the same time, the invention has low-voltage, large modulation bandwidth, small insertion loss and transmission loss, simple production and low cost.

Description

technical field [0001] The invention relates to an electro-optic modulator in the fields of optoelectronic communication and optical information processing, in particular to an electro-optic modulator based on double-sided metal reflection type polarization-independent crystal. Background technique [0002] The electro-optic modulator is one of the most important and commonly used devices in the field of photonics, and the development of electro-optic modulation has an important leading position in the field of electronics. Various electro-optic materials used in the preparation of electro-optic modulators, such as electro-optic crystals, organic polymer electro-optic materials, etc., under the action of an external electric field, the orientation of the refractive index ellipsoid of the material changes, resulting in polarization-dependent characteristics of the device. The widely used lithium niobate (LiNbO 3 ) electro-optic modulation as an example, it has many advantage...

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Problems solved by technology

[0005] Through literature retrieval to prior art, Jingwen W. Zhang etc. published "Optical amplification in Nd 3+ doped electro-optic lanthanum lead zirconate titanate ceramics" (see Nd 3+ Lanthanum Lead Zirconate Titanate Ceramic Electro-optic Amplifier) ​​mentions the use of PLZT secondary electro-optic effect to realize light intensity modulation based on the Kerr effect. Small, so the operating voltage of the modulator is relatively high. At the same time, the device in this document does not mention the polarization independence of the application of the waveguide high-order film

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