Design Methods of Long Period Fiber Gratings for the Equalization of nonflat Erbium Gain Spectrum

摘要

We show how to design long period fiber gratings (LPFG) (of two structures) modeled as the multi-port lattice using the simulated annealing and steepest descent methods for the equalization of the erbium-doped fiber amplifiers (EDFA). We have obtained design parameters of piecewise-uniform long period fiber gratins which fit the inverted erbium gain spectrum of a commercially available EDFA over the entire 1525 nm - 1570 nm range. We analyzed the sensitivity of designed structures by Monte-Carlo simulations.