Abstract
Fiber Fabry-Perot (FFP) filters have been widely used in optical fiber communications, and insertion loss (IL) is one of its important characteristics. Based on theoretically analysis, factors related to IL were discussed. In order to investigate the IL of different structures, simulations are carried out with finite-difference time-domain (FDTD) algorithm. Comparisons are made between the optimized structure and full-size-mirror FFP filter, and fiber-inserted FFP filter as well. Simulation results demonstrated that the finite- size-mirror structure can confine the mode size of the open resonator, hence reduce the IL of FFP filter.
Highlights
Tunable fiber Fabry-Perot filters (FFP-TFs) are widely used in optical fiber communications and optical sensing systems, since they have advantages of low loss, high tuning speed, wide tuning range, high finesse, and flexible structures and different practical applications
In fiber Brag grating (FBG) sensing systems, Fiber Fabry-Perot (FFP)-TFs can be adopted in dynamically demodulation [2]
(c) Finite-size-mirror FFP filter size-mirror structure and fiber inserted structure, the output field of filters distributes in the area of fiber cladding and core, while for the finite-size-mirror filter the output field concentrates in the area of fiber core, and its centre intensity is much stronger
Summary
Tunable fiber Fabry-Perot filters (FFP-TFs) are widely used in optical fiber communications and optical sensing systems, since they have advantages of low loss, high tuning speed, wide tuning range, high finesse, and flexible structures and different practical applications. For optical fiber communication applications, FFP-TFs can be used to select wavelength for each channel in wavelength division multiplexing (WDM) system [1]. Insertion loss is one of the important characteristics of FFP-TFs. Insertion loss is classified into two kinds of loss, namely extrinsic loss and intrinsic loss. Reducing the intrinsic loss of FFP-TFs, needs to optimize their structures. For this purpose, a lot of work has been reported. Characteristics and mode distribution of the finite-size-mirror FFP-TF are studied and simulated. We compare this new finite-size-mirror structure with fiber inserted structure and full-size-mirror structure
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