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全光再放大、再定时、再整形(3R)技术是未来全光通信网络的发展方向,全光时钟提取是全光3R技术的关键技术之一。随着新型相位调制格式信号的广泛应用,对新型相位调制格式信号的全光时钟提取研究引起了越来越多的关注。基于此,提出了一种基于可调谐解调器的速率可变差分相移键控非归零码(NRZ-DPSK)信号的时钟提取方法。采用自由空间光的斐索干涉仪构成可调谐解调器,将NRZ-DPSK信号转换为含有时钟分量的归零码(RZ)强度信号,调谐范围可覆盖2.5~40Gb/s。将解调出的RZ信号注入到光纤环形激光器实现了5Gb/s的长度为27-1的伪随机码NRZ-DPSK信号的全光时钟提取,其消光比高于10dB。
All-optical amplification, re-timing, reshaping (3R) technology is the future direction of all-optical communications networks. All-optical clock extraction is one of the key technologies for all-optical 3R technology. With the wide application of the new phase modulation format signal, more and more attentions have been paid to the research of all-optical clock extraction of the new phase modulation format signal. Based on this, a novel clock extraction method based on tunable demodulator for rate-variable differential phase shift keying non-return-to-zero (NRZ-DPSK) signals is proposed. The Fizeau Interferometer, which uses free-space light, forms a tunable demodulator that converts the NRZ-DPSK signal into a zero-return-code (RZ) intensity signal with a clock component that covers 2.5-40 Gb / s. The demodulated RZ signal is injected into a fiber ring laser to achieve a total optical clock extraction of 5Gb / s pseudo-random code NRZ-DPSK signal with a length of 27-1, and the extinction ratio is higher than 10dB.