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中文摘要：
实现了42.8？Gbit/s？差分相移键控调制信号（DPSK）的三信道波分复用传输实验。传输链路为410千米的标准单模光纤，分为四个放大段，采用色散补偿光纤进行色散补偿和掺铒光纤放大器/分布式拉曼放大器混合放大方式。给出了DPSK信号及其解调后的信号在背对背和传输后的光谱和眼图（中路波长信号）。在接收端使用单端检测，给出中路波长的DPSK信号背对背情况和传输后的误码率曲线，并与单信道传输时进行比较。经过传输后的中路信号的误码率可维持在1.0E-3左右。
英文摘要：
The three-channel transmission of 42.8 Gbit/s nonreturn-to-zero differential phase-shift keying （NRZ-DPSK） signal is demonstrated. The 410 km transmission link consists of four spans using standard single-mode fiber （SSMF）. The dispersion compensation fiber （DCF） and erbium-doped fiber amplifier/distributed raman amplifier （EDAF/DRA） hybrid amplification are used. Both optical power spectrum and eye diagrams of the DPSK signal are given in back-to-back configuration and after transmission （center channel）. The curves of bit error rate （BER） of the center channel is given,too, both in back-to-back configuration and after transmission, which is compared with the curve in single-channel transmission configuration. The BER of the DPSK signal of the center channel is 1.0E-3 after transmission using single-ended detection.
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