Theoretical and Experimental Optimization of O-Band Multiwavelength Mixed-Cascaded Phosphosilicate Raman Fiber Lasers

We theoretically analyze and experimentally optimize an O-band mixed-cascaded multiwavelength phosphosilicate Raman fiber laser (MRFL). The theoretical analyses show that the output power is insensitive to the variation of Raman fiber length when it exceeds the optimal length. However, the pump threshold, slope conversion efficiency, and output power of the mixed-cascaded MRFL strongly depend on t...