Preparation method of long period waveguide grating

Abstract

The invention discloses a long-period waveguide grating and a waveguide preparation method, an optical modulator and an optical modulation method. The long-period waveguide grating comprises a lithium niobate substrate (5), a cladding slab waveguide (4), a buffer layer (2), and a coplanar waveguide electrode structure. The buffer layer (2) covers the upper surface of the cladding slab waveguide (4), and the lithium niobate substrate (5) covers the lower surface of the cladding slab waveguide (4). The coplanar waveguide electrode structure includes a signal electrode (6) and ground electrodes (7, 8). The signal electrode (6) covers the middle of the upper surface of the buffer layer (2). A core layer waveguide (3) is arranged in the middle of the upper surface of the cladding slab waveguide (4) and right below the signal electrode (6). The ground electrodes (7, 8) are located on the two sides of the signal electrode (6), and are in the same plane as the signal electrode (6). In addition, the invention discloses an optical modulator of the long-period waveguide grating based on periodic domain structure lithium niobate and an optical modulation method thereof. The long-period waveguide grating has the advantages of low modulation voltage, high modulation bandwidth, easy modulation, and the like.

Description

technical field [0001] The invention relates to the field of integrated optics, in particular to a preparation method of a long-period waveguide grating based on periodic domain structure lithium niobate. Background technique [0002] In recent decades, with the rapid growth of multimedia service demands, traditional electrical transmission networks can no longer meet people's needs, and there is an urgent need for ultra-long-distance and high-capacity optical fiber communication systems. Because optical fiber has the advantages of large transmission capacity, small transmission loss, and light weight, optical fiber communication has become the mainstream method in wired communication networks. The rapid development of large-capacity optical fiber communication networks has strongly promoted the demand and research of broadband, high-speed and ultra-high-speed optical devices. [0003] The key to restricting the development of optical networks lies in the development of adv...

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the defects existing in the prior art, the present invention proposes a preparation method of a long-period waveguide grating, which uses coplanar waveguide electrodes to control the long-period waveguide grating, so as to solve the modulation of the existing interdigitated electrode structure long-period waveguide grating Problems such as low bandwidth, large modulation voltage, and difficulty in modulation, etc., thereby improving the performance of long-period waveguide gratings

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