Channel Spacing Tunable Multiwavelength EDF Laser Based on Single Segmented Polarization Maintaining Fiber Lyot-Sagnac Loop Filter

摘要

a channel-spacing tunable and switchable multiwavelength Erbium-doped fiber laser (MW-EDFL) operating at room temperature is studied using available experimental data. The multiwavelength generation is achieved mainly based on a single segmented polarization maintaining fiber (PMF) in Lyot-Sagnac loop filter (LSLF) and an all-fiber phase modulator. The channel space tuning is performed by means of a polarizer and the DC offset voltage of a Lithium-Niobate (LiNbO{sub}3) amplitude modulator and multiwavelenth switching is performed using polarization controller, those are incorporated in the PMF-LSLF. It is found that discrete channel-spacing of 0.27nm to 1.62nm and corresponding time delay between two orthogonal polarization states of the beam of 30ps to 5ps, respectively, can be achieved. A spectral continuum is also achieved by introducing a time delay of 0.895ps. On top of the experimental study, a mathematical model of channel-spacing tunable PMF-LSLF, which is used in the laser scheme, is also investigated using MATLAB.