Annular cavity dual wavelength laser with saturated absorption ring mirror filter
A saturable dual-wavelength laser based on a saturable absorption ring filter is designed.An unpumped er-bium-doped fiber is inserted into a 3 dB ring mirror to form a saturable absorption ring mirror filter,which is inserted into a ring laser to achieve a stable dual-wavelength output by adjusting the polarization controller.After calculation,6.4 m erbium-doped fiber is selected as the gain medium,and a section of 2 m unpumped EDF is used to form a satu-rable absorption loop mirror filter in combination with a 2 × 2 3 dB coupler to suppress the supermode.In order to sup-press the mode competition caused by the uniform widening of erbium-doped fiber at room temperature,1554 nm fiber Bragg grating(FBG)and 1562 nm FBG are selected for dual-wavelength lasing.Simulation is conducted on the Opti-system platform and experiments are set up to test the output laser power,signal-to-noise ratio,stability,etc.The out-put signal is observed and analyzed with a Optical Spectrum Analyzer.In the experiment,the stable output of dual-wavelength laser at room temperature is obtained,and the signal-to-noise ratio of the two wavelengths is 54.70 dB and 57.50 dB respectively.The 3 dB bandwidth is about 0.13 nm.
ring cavity laserdual wavelengthsaturable absorbing ring mirror filterpolarization controllersignal to noise ratio
万方数据
维普
