Tunable fiber f‑p filters

Abstract

The invention discloses an adjustable optical fiber F-P filter. An F-P cavity of the filter is an elastomer, a through hole is formed in the middle of the elastomer, a ceramic ferrule is inserted into two ends of the elastomer respectively, and optical fibers are inserted into the ceramic ferrules. The elastomer is sequentially sleeved with an annular piezoelectric ceramic drive element and an annular temperature compensating plate ring. The annular piezoelectric ceramic drive element performs extensible motion under the voltage drive effect. When the annular piezoelectric ceramic drive element stretches, thrusts exerted on two sides act on the elastomer and enable the elastomer to stretch, and the length of the F-P cavity is increased. When the annular piezoelectric ceramic drive element shrinks, the length of the F-P cavity is decreased so that the wave length can be changed with change of the cavity length. The adjustable optical fiber F-P filter achieves precise adjustment of the cavity length under the piezoelectric ceramic drive effect, achieves the wave length turning purpose, is compact in structure and has a temperature compensating function itself.

Description

technical field [0001] The invention relates to filters, in particular to an adjustable optical fiber F-P filter. Background technique [0002] With the development and maturity of fiber grating sensing technology, wavelength demodulation technology has attracted more and more attention and attention. The wavelength demodulation system based on tunable optical fiber F-P filter has the advantages of low cost, fast response and high resolution, and has been widely used. The tunable optical fiber F-P filter is the core device of the whole system, and its performance largely determines the performance of the whole demodulation system. In optical communication systems, tunable F-P filters are mainly used for demultiplexing of Wavelength Division Multiplexing (WDM), signal demodulation, etc., and have become mainstream devices and are gradually commercialized. In addition, F-P devices can also be used as signal filters in fiber amplifiers, and also have important applications in...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide an adjustable optical fiber F-P filter that can realize precise adjustment of the cavity length, has a simple and compact structure and has a temperature compensation function in view of the defect that the FP filter structure in the prior art is complex and cannot be packaged in a small size

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