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FBG inscribed on splice joint is proposed to be used as a sensor. It could realize temperature and strain measurement simultaneously because of the different strain responses of the different parts of the FBG inscribed on splice joint, while the temperature responses are same. The strain responses of four overlap values are discussed, which is used to optimize the discrimination capability of the...
A novel and simple overlap-splicing-based scheme is described to realize a shape-controllable Fabry–Perot cavity in a fiber bragg grating (FBG). A Gaussian function with a constant waist width is used to fit the cavity shape and its maximum value is decided by the overlap value. Non-uniform strain distribution along the FBG is introduced by the Gaussian shape cavity when stress is applied on the FBG...
With a pair of circularly polarized lights in the Er-doped fiber, and linearly polarized lights in the rest part of the ring, a bidirectional reciprocal single-longitudinal-mode Er-doped fiber ring laser was demonstrated. The dependence of output power on pumped power of the bidirectional laser was measured. The threshold pumped power was about 7.5 mW. Then the optical spectra for bidirectional outputs...
Based on the adiabatic coupling principle, a new scheme of a broadband circular polarizer formed by twisting a high-birefringence (Hi-Bi) fiber with a slowly varying twist rate is proposed. The conditions of adiabatic coupling for the adiabatic polarizer are identified through analytical derivations for the first time. The key design procedure is then suggested for achieving the required performance...
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