Tunable dual-wavelength erbium ytterbium doped fiber laser assisted by polarization-dependent loss controller

A simple tunable dual-wavelength erbium-ytterbium doped fiber laser (EYDFL) operating at 1550 nm is experimentally demonstrated. The generation of the dual-wavelength is based on cascaded a tunable band pass filter (TBPF) and fiber Bragg grating (FBG). The power of the longer wavelength is controlled by adjusting the longer wavelength loss using a single polarization controller. Thus, simultaneous emission of dual-wavelength emission with optical signal-to-noise ratio of 59.6 dB. The wavelength spacing between the generated dual-wavelength is varied from 3 nm to 10 nm is realized.