Abstract
Using the amplified spontaneous emission (ASE) from an erbium-doped fiber amplifier (EDFA) at zero signal condition, the shifting of resonant wavelengths in a mechanically induced long-period fiber grating (MLPFG), resulting from the intensity induced effects is demonstrated. The theoretical and experimental investigations on the ASE-induced effects in an MLPFG are presented. The developed theory is concise and is useful for differentiating the index changes due to Kerr and other intensity-dependent effects in a long-period fiber grating (LPFG). It is demonstrated that the induced index will be high for the LP11 resonance near the third telecommunication window and is negligible for the LP12 resonance. Because of the increase in microbend loss at each groove of the MLPFG, the thermally induced nonlinear effects lessen at higher values of applied pressures
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