光强调谐曲线是激光陀螺工作模式选取和稳频的依据，而陀螺的增损比将直接决定光强调谐曲线的形式.为了提高陀螺准确度，本文对双同位素综合展宽情况下二频激光陀螺出光带宽与增损比之间的关系进行了分析计算,结果表明，激光陀螺的出光带宽与增损比之间存在单调递增的变化关系.数值仿真了不同增损比情况下陀螺的光强调谐曲线，结果表明，根据激光陀螺出光带宽与相邻纵横间隔相对大小的不同，其光强调谐曲线的形状可分三种，仿真与试验结果非常吻合.分析并试验验证了增损比选取不当对激光陀螺工程化应用可能产生的影响，给出了不同腔长情况下激光陀螺增损比合理选取的参考值，即应保证陀螺的出光带宽约等于其相邻纵横间隔.

The intensity tuning profile is the base for mode selection and frequency stabilization in ring laser gyro (RLG), which is decided directly by the gaintoloss ratio (GTLR). To improve the performance of the RLG, the dependence of the output bandwidth on the GTLR for twomode RLG with the gain medium making of the mixture of Neon isotopes (Ne20 and Ne22) is numerically analyzed, with the consideration of comprehensive broadening (both homogeneous broadening and inhomogeneous broadening). It is shown that the output bandwidth increases monotonically with the GTLR of RLG. The intensity tuning profiles with different GTLRs of RLG are simulated and the results show that the intensity tuning profiles can be divided into three typical forms, according to the relative value of the output bandwidth to the adjacent longitudinal mode spacing, exhibiting great agreement with the experimental ones. The potential influence of improper GTLR selection on the application performance of RLG is analyzed and experimentally demonstrated. The ideal selection of GTLR for RLG is proposed, that is, the output bandwidth of the RLG should be approximately equal to its adjacent longitudinal mode spacing.