Broadly tunable multi-wavelength Brillouin-erbium fiber laser in a Fabry-Perot cavity

The paper demonstrates the utilization of a tunable band-pass filter in producing tunable multi-wavelength Brillouin-erbium fiber lasers within a Fabry-Perot cavity. The optimization of the Brillouin pump wavelength position within the bandwidth of the self-lasing cavity modes is important to achieve the maximum stable output channels. The same number of 14 output channels with constant channel spacing of 10.5 GHz were able to be generated within 32 nm range. Besides the tunability, this design also has the advantage of consistent power requirement of both the 980 nm laser diode and the Brillouin pump in generating the 14 channels through the broad tuning range.