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利用相位预调制技术解决高速长距离光纤传输系统中面临的接收灵敏度降低和色散容限问题。通过在发射端对非归零(NRZ)的光信号进行比特同步相位预调制,使非归零码在传输过程中得到波形重整,演变为归零(RZ)的波形,从而提高眼图开启度。实验观测了普通非归零码和相位预调制的非归零码在不同相位调制深度和色散下的光谱、眼图和功率代价。10Gb/s的传输结果表明,链路色散绝对值小于1000ps/nm时,施加相位预调制的非归零信号功率代价小于1dB,比普通非归零信号具有更高的接收灵敏度和更低的色散功率代价。因此,基于相位预调制的信号整型技术可减轻系统对光信噪比和色散管理的要求,延长传输距离。
The use of phase pre-modulation technology to solve the high-speed long-distance optical transmission systems are faced with reduced reception sensitivity and dispersion tolerance issues. The non-return-to-zero (NRZ) optical signal is phase-modulated by the bit synchronization at the transmitting end, so that the non-return-to-zero code is waveform-reshaped during transmission and evolves into a zero return (RZ) waveform, degree. The spectral, eye and power costs of non-return-to-zero codes and phase-pre-modulated non-return-to-zero codes at different phase modulation depths and dispersions were experimentally observed. Transmission results at 10 Gb / s indicate that the power consumption of the non-return-to-zero signal applying the phase pre-modulation is less than 1 dB when the absolute value of the link dispersion is less than 1000 ps / nm, which has higher receiving sensitivity and lower dispersion than the ordinary non-return-to-zero signal Power cost. Therefore, signal shaping technology based on phase pre-modulation can reduce the system requirements for optical signal-noise ratio and dispersion management, and prolong the transmission distance.