Channel-spacing and wavelength switchable multiwavelength erbium-doped fiber laser using sampled Hi-Bi fiber grating and photonic crystal fiber loop mirror

We propose and demonstrate a stable room-temperature channel-spacing and wavelength switchable multiwavelength erbium-doped fiber (EDF) laser using a sampled Hi-Bi fiber grating and a photonic crystal fiber (PCF) loop mirror. The PCF loop mirror induces the intensity-dependent cavity loss to suppress the wavelength competition of the EDF. By adjusting the polarization controller, we can achieve 0.4 nm and 0.8 nm channel-spacing of the multiwavelength EDF laser. The measured power fluctuation of each wavelength is less than 0.2 dB and the peak power differences among the main oscillation wavelengths are less than 1.0 dB. Another desirable characteristic is that it needs a relatively low pump power of 100 mW.