A device and method for fabricating fiber gratings with arbitrary patterns

Abstract

The invention discloses a method and device for preparing fiber bragg gratings in any patterns. The device comprises fiber bragg grating etching light, a controllable diaphragm, a reflector, a phase mask plate and a to-be-etched grating. Passing and shutting of the fiber bragg grating etching light are controlled through the controllable diaphragm, the fiber bragg grating etching light is emittedthrough the controllable diaphragm, and the fiber bragg grating etching light penetrating the controllable diaphragm is emitted to the phase mask plate by means of normal incidence under the reflection action of the reflector. The reflector is put on a movable support, and the movable support controls the reflector to be at different positions parallel to the phase mask plate. The phase mask plateenables the fiber bragg grating etching light to form initial interference fringes. The to-be-etched grating is formed by periodic refractive index modulation of the initial interference fringes formed by the fiber bragg grating etching light. In an operating process, requirements on light source coherence and mechanical stability of the device are low, and easiness in implementation in production engineering application is achieved.

Description

technical field [0001] The invention belongs to the field of optical fibers, and in particular relates to a device for preparing an optical fiber grating with an arbitrary pattern and a method thereof. Background technique [0002] The appearance of fiber grating is an important technological breakthrough in the field of optical fiber, and its research has rapidly become a hot spot in the field of optical fiber devices in the world. Because fiber grating has many advantages such as good stability, small size, anti-electromagnetic interference and easy compatibility and integration with optical fiber systems, it has broad application prospects in the fields of optical fiber communication and optical fiber sensors. [0003] At present, the commonly used fiber grating preparation methods mainly include two-beam interferometry and phase mask method. [0004] In 1989, Meltz et al. of United Technology Research Center in the United States proposed to write fiber gratings using a ...

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Problems solved by technology

However, the pattern of the fiber grating obtained by this fiber grating preparation method is strictly limited by the phase mask

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