采用一种简单的双光栅级联结构，通过不同波长的两束控制激光进行增益控制；同时采用两级放大结构，实现全光增益控制光纤放大器高增益和高功率输出。当可调光衰减器功率衰减量分别为33.2 dB和3.8 dB，输入光功率在-5.1 dBm~2.0 dBm范围变化时，增益控制光纤放大器的最大输出功率为1.55 W，平均增益和噪声系数分别约为30.3 dB和6.4 dB，增益漂移小于0.27 dB。同时，改变环形腔损耗得到不同的增益，在增益漂移允许范围内（小于0.3 dB），增益钳制范围为24.5 dB~31.3 dB。另外，在双信道情况下，当剩余信道功率为0.74 mW和1.57 mW时，其增益漂移范围分别小于0.08 dB和0.16 dB。

With the configuration of double-grating and two-stage amplifying, the optical fiber amplifier realizes high gain-clamped and high output power, controlled by two controlling lasers of different wavelengths. As input power ranging from -5.1 dBm to 2 dBm with the power attenuations of optical attenuators as 33.2 dB and 3.8 dB, the maximum output power comes to 1.55 W, while the average gain and noise figure of the gain-clamped fiber amplifier are approximately 30.3 dB and 6.4 dB, respectively. Furthermore, the gain′s excursion is limited in 0.27 dB. The range of clamped gain can be 24.5 dB~31.3 dB, while the gain′s excursion is less than 0.3 dB. As the powers of remaining channels are 0.74 mW and 1.57 mW respectively, the ranges of excursions are less than 0.08 dB and 0.16 dB with double channels existing in the gain-clamped amplifier.