Eight-wavelength switchable fiber ring laser with ultranarrow wavelength spacing using a quadruple-transmission-band polarization maintaining fiber Bragg grating

We propose and demonstrate an eight-wavelength switchable laser with approximately 40 pm wavelength spacing using a polarization maintaining fiber Bragg grating (PMFBG). This PMFBG has a specially designed quadruple-transmission-band. When it is used in a fiber ring configuration, four wavelengths can be switched in one state of polarization, while the other four can oscillate in the corresponding orthogonal state. PACS 42.55.Wd; 42.81.-i; 42.81.Gs