Lithium niobate film electro-optical modulator

Abstract

The invention discloses a lithium niobate film electro-optical modulator. The input end and the output end of a lithium niobate film optical waveguide are placed on the bottom edge of a lithium niobate film electro-optical modulator chip, and the input end and the output end of the lithium niobate film optical waveguide are respectively connected with a modulation area optical waveguide by adopting a 90-degree bent optical waveguide. Secondly, the coplanar traveling wave electrode in the modulation area is connected with the electrode input port or the electrode output port only through a section of transition electrode, and no 90-degree turning transition electrode exists. According to the innovative structure, on one hand, the input optical fiber and the output optical fiber can be placed at the bottom edge of the tube shell of the electro-optical modulator to further reduce the length of the electro-optical modulator, on the other hand, microwave signal loss caused by a 90-degree turning transition electrode in the traveling wave electrode can be reduced, and the modulation bandwidth of the electro-optical modulator can be improved.

Description

technical field [0001] The invention can be applied to technical fields such as optical fiber communication, optical fiber sensing, microwave photonics, quantum communication, etc., and specifically relates to a lithium niobate thin film electro-optical modulator. Background technique [0002] Optical modulators are widely used in optical fiber communication, optical fiber sensing, microwave photonics, quantum communication and other technical fields. A key function of optical fiber for low-loss transmission. The external modulator using the principle of linear electro-optic effect of lithium niobate crystal has an important application in optical fiber signal transmission system due to its outstanding advantages such as low chirp coefficient, high modulation bandwidth, and high on-off extinction ratio. [0003] The lithium niobate electro-optic modulator chip fabricated on the lithium niobate block material with traditional technical solutions has the advantages of good st...

AI Technical Summary

Problems solved by technology

[0010] (a) Since the input optical fiber or output optical fiber needs to be placed on the left or right side of the electro-optic modulator chip and device, and the port of the device shell needs to be protected by a sheath, this adds a lithium niobate electro-optic modulator The overall length is not conducive to the miniaturization of the device;

[0011] (b) The 90° turning transition electrode on the electro-optic modulator chip will inevitably increase the microwave signal loss, such as transmission loss and bending loss, which is not conducive to the realization of high modulation bandwidth of the electro-optic modulator

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