Abstract:

Phase-shift grating is a key component,which forms the resonance cavity of DFB fiber laser .Its additional loss make that coupling coefficient and phase-shift grating length distinctly affect the optimum output power of DFB fiber laser .so the author had researched these factors by transfer matrix method. Through numerical simulation,the author had analyzed the variation of the optimum output power with the optimum coupling coefficient and grating length under the conditions of different cavity loss.It shows that the optimized output power can be obtained by adjusting the optimum grating length and the coupling coefficient according to the level of cavity loss .These conclusions can provide guidance for the optimized structure in designing the fiber laser.

Key words: laser techniques, optimum output, transfer matrix method, phase-shift grating, Er3+ -doped DFB fiber laser