针对分布式卫星光网络的动态路由特性，提出了一种基于两级偏移滤波的波长保持型全光再生方案。该方案利用半导体光放大器(SOA)和高非线性光纤(HNLF)中自相位调制(SPM)效应感应的频率啁啾具有相反符号的特点，对经过其中的信号分别进行红移滤波和蓝移滤波，从而不仅实现了对光信号的两级再生，而且有效抵消了各自滤波造成的频率偏移，实现了再生前后信号波长的连续性。同时该方案具有结构简单、体积小、重量轻等特点，能够满足星上应用对有效载荷的限制。研究结果表明：该方案能够将信号Q因子提高超过1.5 dB，且与一级再生结果相比较，可以使误码率(BER)进一步降低一个量级。

Aiming at the dynamic routing characteristic of distributed satellite network, a wavelength-preserving all-optical regenerative scheme based on two-stage offset filtering is put forward. By using the property that the signs of chirp induced by self-phase modulation (SPM) are opposite in semiconductor optical amplifier (SOA) and high nonlinear fiber, a red-shifted filtering and a blue-shifted filtering are done respectively on the signals after the SOA and the HNLF, which not only realizes a two-stage regeneration of signals, but also compensates the frequency offset and keeps the wavelength unchanging before and after the regenerator. Meanwhile, the scheme is of simple structure, small volume and light quality, which can satisfy the limitation of satellite to the payloads. The result shows that the Q factor of signals can be improved more than 1.5 dB, and the bit error rate (BER) can be reduced more than one order of magnitude compared with the result of one-stage regenerator.