Abstract
This study designed a novel high-performance fiber Bragg grating (FBG) optical add/drop multiplexers (OADMs) by referring to current numerical simulation methods. The proposed FBG-OADM comprises two single-mode fibers placed side by side. Both optical fibers contained an FBG featuring identical parameters and the same geometric structure. Furthermore, it fulfills the full width at half maximum (FWHM) requirement for dense wavelength-division multiplexers (DWDMs) according to the International Telecommunication Union (i.e., FWHM < 0.4 nm). Of all related numerical calculation methods, the combination of the finite element method (FEM) and eigenmode expansion method (EEM), as a focus in this study, is the only one suitable for researching and designing large-scale components. To enhance the accuracy and computational performance, this study used numerical methods—namely, the object meshing method, the boundary meshing method, the perfectly matched layer, and the perfectly reflecting boundary—to simulate the proposed FBG-OADM. The simulation results showed that the novel FBG-OADM exhibited a −3 dB bandwidth of 0.0375 nm. In addition, analysis of the spectrum revealed that the drop port achieved the power output of 0 dB at an operating wavelength of 1550 nm.
Highlights
Fiber gratings refer to periodic structures that change according to the refractive index (RI) of the core of photosensitive optical fibers
This study developed a novel, high-performance fiber Bragg grating (FBG)-optical add/drop multiplexers (OADMs) that was designed through the combined finite element method (FEM)-eigenmode expansion method (EEM) approach
FBG, prompting the coupled core mode to be propagated along the Z direction and outputted via the add process, because the proposed FBG-OADM has a symmetric structural design, signal drop signal port, completing the signal drop process
Summary
Fiber gratings refer to periodic structures that change according to the refractive index (RI) of the core of photosensitive optical fibers. In researching and designing the proposed FBG-OADM, this study combined the finite element method (FEM) and eigenmode expansion method (EEM) to perform numerical simulations for calculation and analysis. The core mode signal with a wavelength of λ1 is subjected to perturbation from perturbation from the FBG and is coupled to the cladding mode propagated along the −Z direction. Regarding the FBG, prompting the coupled core mode to be propagated along the Z direction and outputted via the add process, because the proposed FBG-OADM has a symmetric structural design, signal drop signal port, completing the signal drop process. Of thethe newly-proposed two OADMs product of the spectrums two LPGs (orFBG-OADM two FBGs) features and 2 ×a 2narrower optical fiber spectrum, indicating that it1.canAccording achieve exceptional bandwidth performance (−3 dB).
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