Multi-Wavelength Narrow Linewidth Random Fiber Laser Based On Fiber Bragg Grating Fabry-Perot Filter

Random lasers which formed by the multiple scattering that processed as well as in a disordered of the gain medium,now has attracted considerable attention among a lot of researchers for these last decades.In 1990 s,there is a report which described about the random lasers that experimentally to formed the random laser by disordered semiconductor or organic materials as well.In 2010,also there is a researcher "Turitsyn et al" found an idea of a new sort of random laser which focused on extremely weak of random Rayleigh scattering(RS)as well as in a standard of single-mode fiber(SMF)respectively.This work has spurred several experiments and theories on the use of random distribution feedback fiber laser(RDF-FL).Among of this,we also realized that the multi-wavelength fiber laser(MWFL)has recently attracted significant attention interest through their powerful application in WDM system,high-resolution spectroscopy and as well as fiber optic sensing.In this paper,the standard single-mode fiber is used to launch or form a half-opened cavity structure for generating the random fiber laser.Apart from that,we used the FBG-FP as a filter to attain the multi-wavelength and linewidth RFL.Firstly,we mainly used the Rayleigh scattering that processed as well as in a standard single-mode fiber to provide random distribution feedback at the same time while using erbium-doped fiber(EDF)to provide the gain for achieving a broadband random laser output.Then,FBG-FP is added to the half-open cavity random laser structure,while FBG-FP is a narrow-linewidth,multi-wavelength filter.The multi-wavelength and linewidth RFL can be achieved when the broadband RFL goes through the FBG-FP,a random fiber laser output having more than 10 wavelengths and a linewidth of less than0.01 nm is realized.