Single-stress-element optical fiber tilted fiber bragg grating and preparation method thereof

Abstract

The invention provides a single-stress-element optical fiber tilted fiber bragg grating and a preparation method thereof. A single-stress-element optical fiber is a special optical fiber with a singlestress element in a cladding. The single-stress-element optical fiber tilted fiber bragg grating is characterized by comprising the following steps: sequentially putting an excimer laser, a reflector, a beam expander, a cylindrical lens, a mask plate and a single stress element optical fiber into a writing light path, and adjusting the optical fiber by using a refractive index matching liquid, amicroscope and an optical fiber rotating clamp; and enabling the included angle between the stress element and the grating surface in the fiber core to meet the requirement of the required single-stress-element optical fiber tilted fiber bragg grating. The single-stress-element optical fiber tilted fiber bragg grating can be used for preparing the single-stress-element optical fiber tilted fiber Bragg grating, and can be widely applied to the technical field of optical fiber devices.

Description

[0001] (1) Technical field [0002] The invention relates to a single-stress-element optical fiber inclined optical fiber Bragg grating and a preparation method thereof, belonging to the technical field of optical fiber devices. [0003] (2) Background technology [0004] Slanted Fiber Bragg Grating (Slanted Fiber Bragg Grating), as an important part of Fiber Bragg Grating, has its unique features. Different from ordinary fiber Bragg gratings, the grating plane of tilted fiber Bragg gratings is no longer perpendicular to the fiber axis, but has a certain tilt angle. The introduction of the slant strengthens the coupling from the forward propagating core mode to the backward propagating cladding mode and radiation mode. Based on this feature, tilted fiber Bragg gratings are widely used in optical filtering, optical fiber sensing, gain flatteners, and polarization-dependent devices. [0005] The conventional phase mask method is used to prepare tilted fiber Bragg gratings. Ther...

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Problems solved by technology

Therefore, although the tilted fiber Bragg grating has directionality, and the response of the cladding mode resonance peak is different when the bending direction is at different angles to the grating surface, it can only distinguish the bending in the semicircular direction, and the direction of the fiber with respect to the grating surface When the long axis is symmetrical left and right, there is no difference in the response of the spectrum, that is, only the bending of 0°-180° can be resolved, and the bending resolution of the full range of 360° cannot be realized.

Therefore, this symmetry will affect the usage scenarios of tilted fiber Bragg gratings

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