Multi-wavelength erbium-doped fiber ring lasers based on an optical fiber tip interferometer

摘要

Rare earth-doped fiber lasers are interesting in the field of optical fiber lasing and sensing. One of the interesting topicsis the tunable/switched multi-wavelength lasers. However, due to the homogeneous broadening gain, it is difficult togenerate multiple wavelengths in the fiber lasers based on erbium-doped fibers. Here, we propose a tunable multiwavelengtherbium-doped fiber ring laser based on an optical fiber tip Fabry-Perot (FP) interferometer, which acts awavelength filter and a reflector of the fiber ring laser. With the purpose to propose a method for switch multiwavelengthspectra, the strain and thermal variations around the modal interferometers are investigated. The spectra aresymmetric with a maximal power difference about 25 dB between the lasing modes and the average of the side modesuppression ratio, which is tuned into the C-band with a resolution of 0.02 nm. This laser offers low wavelength drift,good signal to noise ratio and high-power stability, and can therefore be used for sensing applications.