中文摘要：

为了解决全光码型转换中结构复杂和速率限制的问题，提出了应用于全光网络，利用半导体光放大器的非线性效应和光带通滤波器滤出特定光谱成分来实现全归零码到非归零码的全光转换方案.基于超快半导体光放大器模型，进行了40 Gbps归零码到非归零码全光转换的仿真与实验验证.实验结果表明：40 Gbps归零码到非归零码全光转换的功率损耗约为2 dB，与仿真结果高度吻合，验证了该方案的可行性与有效性.

英文摘要：

To solve the problems of complicated structure and rate limiting in conventional format conversion system, 40 Gbps all-optical format conversion from return-to-zero to non-return-to-zero modulation format converter was proposed and demonstrated with a single semiconductor optical amplifier and an optical band-pass filter. The format converter consists of a single semiconductor optical amplifier which is acted as a nonlinear element to broaden the spectrum of input signal and the optical band-pass filter which is used to extract the special spectrum from the broadened spectrum. By adopting the ultra-fast semiconductor optical amplifier model, the 40 Gbps return-to-zero to non-return-to-zero format conversion was demonstrated with simulation. The proof of the principle experiment at 40 Gbps was demonstrated by using the test semiconductor optical amplifier and optical band-pass filter converter. Experimental results show that the power penalty induced by the pattern converter is about 2 dB, which is well coincidence with simulated results. The proposed scheme is robust and potential for applications in future optical networks.