光信噪比(OSNR-Optical Signal Noise Ratio ） 光信噪比的定义是在光有效带宽为0.1nm内光信号功率和噪声功率的比值。光信号的功率一般取峰峰值，而噪声的功率一般取两相临通路的中间点的功率电平。光信噪比是一个十分重要的参数，对估算和测量系统有重大意义。 OSNR的定义如下： 其中：Pi是第i个通路内的信号功率；Br是参考光带宽，通常取0.1 nm；Bm是噪声等效带宽；Ni是等效噪声带宽Bm范围内窜入的噪声功率。
讨论了基频光与倍频光间的信噪比关系及如何测试倍频光信噪比等问题。
What is the relation of the SNR of the fundamental and its frequency doubled laser and how to measure the SNR of the frequency doubled laser are discussed.
我们研究了DPASK脉冲的解调过程以及输入ask信号功率与光信噪比代价之间的关系。
The demodulation process of the generated DPASK pulses is investigated and the relationship between optical signal-to-noise ratio (OSNR) penalty and the input ASK power is presented.
并在掺杂铌酸锂晶体中获得了高信噪比，信号光增益高达1583倍的光像放大。
We obtain a optical image amplification with high gain factor of 1583 in doped lithium niobate crystals.
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