Optimal design configuration parameter for ring resonance cavity

Influences on the FRSLs (fiber ring semiconductor lasers) properties of configuration parameter,i.e.,splitting ratio and coupling coefficient and residual reflectivity of SOA (semiconductor optical amplifier),have been examined using a simple traveling wave rate equations model of FRSLs,which is used to calculate threshold current,quanta efficiency and output power.The analysis confirms that there is an optimum splitting ratio to trade off between the threshold current,quanta efficiency and output power,whose behavior of an almost linear increase in single pass gain,maximal cavity gain and its stability with decrease average residual reflectivity.The threshold current to logarithm of splitting ratio meets linear relation.The simulating results verify that theory can give more accurate explanation to experimental phenomena.