Dependence between the output properties and device parameters of FRSLs (fiber ring semiconductor lasers), including on splitting ratio and coupling coefficient, was investigated using the rate equations. An analytical expression for position-dependent photon flux in FRSLs is deduced. The experimental results are compared with theoretical simulations, in order to select and configure an appropriate splitting ratio. The analysis confirms that there is an optimum splitting ratio to trade off between the threshold current and output power. As the results well show, the excellent agreoiient between simulation and experiment was obtained.