中文摘要：

一个在里面乐队与高分辨率和大测量范围监视技术的光 signal-to-noise 比率(OSNR ) 基于 lowbandwidth 被表明协调接收装置和悦耳的激光。OSNR 的测量范围从 10 ～ 25 dB，分辨率能关于杮? 偏 ? 被控制；吗？？

英文摘要：

An in-band optical signal-to-noise ratio （OSNR） monitoring technique with high resolution and large measurement range is demonstrated based on low- bandwidth coherent receiver and a tunable laser. The measurement range of OSNR is from 10 to 25 dB and the resolution can be controlled about ±1 dB.