Cascaded Random Raman Fiber Laser With Low RIN and Wide Wavelength Tunability

Abstract Cascaded random Raman fiber lasers (CRRFLs) have been used as a new platform for designing high power and wavelength-agile laser sources. Recently, CRRFL pumped by ytterbium-doped (YRFL) has shown both output low relative intensity noise (RIN). Here, using wavelength- bandwidth-tunable point reflector in YRFL, we experimentally investigate the impacts of YRFL on spectral RIN properties CRRFL. We verify that bandwidth determines temporal stability YRFL. It is found with an increase from 0.2nm to 1.4nm, higher purity lower can be achieved due better pump. By broadening reflector’s lasing power, purity, 4th-order at 1349nm reach 3.03W, 96.34%, −115.19 dB/Hz, respectively. For comparison, 0.2 nm are only 91.20% −107.99dB/Hz, Also, realize wavelength widely tunable wavelength-tunable This work provides development ideal distributed amplification pump sources based CRRFLs good wide tunability, which great importance applications optical communication sensing.