Distributed sensor optical fiber as well as preparation device and method thereof
A technology for sensing optical fibers and preparation devices, which is applied in cladding optical fibers, optical devices to transmit sensing components, optical waveguides and light guides, etc., which can solve the difficulties in ensuring the consistency of writing conditions, the limitation of sensing distance and multiplexing capacity, and the grating Unit identity is difficult to achieve and other problems, to achieve the effect of benefiting the optical fiber sensing length and multiplexing capacity, ensuring stability and identity, and good realizability
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[0021] The invention provides the structural design, preparation method and device of the distributed sensing optical fiber.
[0022] The invention provides a special structure design of distributed sensing optical fiber. A series of weak Bragg reflection periodic structures with exactly the same physical structure and optical properties are continuously distributed on the optical fiber at a certain distance. The physical essence of this structure is that the refractive index of the fiber core is periodically distributed, and the depth and length of the refractive index modulation can be flexibly designed. The optical characteristics of this structure are that it can reflect a certain wavelength and transmit all other wavelengths, but it is different from the strong reflection of the Bragg grating. Its transmission characteristic is a narrow bandwidth and weak reflection, so we call it " Weak Bragg Reflection Periodic Structure". When the signal light enters the fiber core a...
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