Multiwavelength Erbium doped fiber laser based on nonlinear polarization rotation

A multiwavelength fiber ring laser is demonstrated using a nonlinear polarization rotation (NPR) effect. An isolator and a photonic crystal fiber are incorporated in an Erbium doped fiber laser (EDFL) to generate intensity-dependent transmission induced by the NPR effect which allows the multiwavelength generation at room temperature. A stable 17 lasing lines in 1560 nm region are generated. The multiwavelength Erbium doped fiber laser (EDFL) exhibits spacing of 0.27 nm. EDF pump power was varied from 30 mW to 120 mW. Higher Erbium doped fiber (EDF) pump power generally leads to more multiwavelength generation at the expense of lower SNR due to higher noise level.