Pure quartz core cladding mode resonant special type optical fibre and method for making same

Abstract

The invention relates a pure silica core cladding mode resonance special fiber and a method for preparing the same. The fiber comprises a fiber core of the pure silica and an outer cladding of the pure silica; a resonance inner cladding is arranged between the fiber core and the outer cladding and has a refractive index lower than the fiber core and the outer cladding and can ensure the thicknessof the resonance inner cladding when partial light energy is transmitted in the resonance inner cladding. The method of the invention is to make a fiber preform comprising outer cladding deposition, resonance inner cladding deposition and fiber core deposition on an improved chemical vapor deposition (MCVD) rod making machine directly by adopting outside vapor deposition and then drawing the fiber. Meanwhile, the method is also applicable to rod making technology such as outside vapor deposition (OVD), plasma chemical vapor deposition (PCVD) and vapor axial deposition (VAD) to prepare the fiber preform of the invention. The cladding mode resonance special fiber of the invention is characterized by being simple in preparation, stable in performance, flexible to use and convenient for batchproduction and can be applied to make fiber spectral filters, dispersion compensators and fiber pressure sensors.

Description

technical field [0001] The invention relates to a pure quartz core-cladding mode resonant special optical fiber, which belongs to the technical field of optical fibers. The cladding mode resonance special optical fiber of the present invention has the characteristics of simple preparation, stable performance, flexible use, convenient mass production, etc., and can be applied to the production of optical fiber spectral filters, dispersion compensators, optical fiber sensors and the like. Background technique [0002] Cladding mode resonance is to use some special optical waveguide structure to couple the optical energy transmitted in the fiber core to the fiber cladding waveguide for transmission. The coupling structure parameters determine the phase matching conditions of different order core modes and cladding modes. Thereby achieving cladding mode resonance [B.J. Eggleton, P.S. Westbrook, et al. Journal of Lightwave Technology, 2000, 18(8): 1084-1100]. The resonance chara...

AI Technical Summary

Problems solved by technology

[0004] However, the cladding mode resonance based on the fiber grating structure requires secondary processing of the optical fiber, and there are problems in its reliability and consistency, especially when it is used at high temperature and for a long time, there will be performance degradation. Deep scientific problems will need to be solved; cladding mode resonance based on photonic crystal fiber, because of its very complicated preparation process, there is no commercial manufacturer in my country at present, and it mainly needs to be imported, especially the mode distribution and conventional single-mode resonance. The coupling problem of optical fiber is also a scientific problem to be solved

At the same time, the above two implementation forms still have problems to be further solved in terms of filter width, filter stability, and mode noise of cladding mode resonator devices, which requires research on fiber waveguides and their devices based on new principles

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