Double-solid-core optical fiber photo-thermal phase modulator coated with heat-sensitive material

Abstract

The invention discloses a double-solid-core optical fiber photo-thermal phase modulator coated with a heat-sensitive material, and belongs to the technical field of optical fiber phase modulation. Thedouble-solid-core optical fiber photo-thermal phase modulator is formed by sequentially connecting a signal light source, a pump light source, a 3dB coupler, a circulator, a single-mode optical fiber, a section of double-solid-core optical fiber and a detector. The single-mode optical fiber and the double-solid-core optical fiber are directly aligned and welded, light in the single-mode optical fiber is coupled into two fiber cores of the double-solid-core optical fiber by utilizing a fused biconical taper technology at a welding spot, and a Michelson interferometer is formed by utilizing reflection of the end surfaces of the fiber cores. The cladding near one fiber core of the double-solid-core optical fiber is polished by using a wheel type side polishing technology, so that the fiber core is exposed in the air. In order to increase the modulation degree of the phase modulator, the fiber core with the polished side surface is coated with a heat-sensitive material. The phase modulator is simple to manufacture and easy to be interconnected with a single-mode optical fiber, and the two fiber cores are arranged in one waveguide, so that the modulator is high in integration degree, and the response is approximately linear. The modulator can be widely applied to the aspect of phase modulation.

Description

technical field [0001] The invention belongs to the technical field of optical fiber phase modulation, in particular to a double solid-core optical fiber photothermal phase modulator coated with thermosensitive materials. Background technique [0002] A device that modulates the phase, frequency, and intensity of an output optical signal is called an optical modulator, which plays an important role in optical information processing systems, optical interconnections, and optical communication networks. However, the application of traditional optical modulators is limited due to factors such as large volume, complex system, and high cost. Therefore, fiber-integrated optical modulation structures based on optical fibers have been proposed. The optical fiber modulator has the advantages of compact structure, light weight, small size, high sensitivity, strong anti-electromagnetic interference ability, and good high-temperature performance. A single optical fiber can measure param...

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However, silica, the main component of optical fibers, has relatively weak nonlinear characteristics, and it is still

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