Conversion signal can obtain small relative intension noise when signal light and probe light have opposite direction of transmission besides small power of signal and big power of probe.

• 另外大的探测光功率与大的信号光功率可以更加有效的获得两臂的相位差,但是大的信号光功率可以加大相对噪声强度,对系统不利。 同时大的探测光功也率会对输出信号产生大的啁啾。