The problem with noise shaping is that small signals get lost - any signal below the noise shaper noise floor is lost information.
噪音整形产生的问题，就是小信号的损失——信号小于噪音整形本底噪音的就是损失的信息量。
Control pulse is coupled into this pulse shaper by wavelength division multiplexer. Nonlinear phase shift of signal laser is induced by control pulse because of cross phase modulation.
该全光脉冲整形器利用波分复用器将控制光脉冲引入光纤环形镜中，控制光脉冲由于交叉相位调制在信号光上产生了非线性附加相移。
Signal laser interferes in fiber coupler, then shaped signal pulse transmits from output port of this pulse shaper. Signal pulse's waveform is determined by the profile of the nonlinear phase shift.
信号光在耦合器中发生干涉，经过整形的信号光脉冲从脉冲整形器的出射端出射，信号脉冲的波形由非线性附加相移的波形决定。
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