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报道了高速率单信道非归零差分相移键控(NRZ-DPSK)调制信号的长距离光纤环路传输。光纤环路总长414km,由4个放大段组成。每个放大段由标准单模光纤(SSMF)和色散补偿光纤(DCF)构成,采用掺铒光纤放大器/分布式拉曼放大器(EDFA/DRA)混合放大。测量了42.8Gb/s差分相移键控信号在环路传输1,2,3圈(414km,828km和1242km)后的光谱和眼图。在接收段使用单端检测的条件下,给出了DPSK信号在背对背情况,414km和1242km传输后的误码率(BER)随接收机功率变化的曲线。DPSK信号在1242km传输后最低误码率可达6.3×10-4。在使用增强型前向纠错(FEC)技术后,能实现无误码传输。
Reported long-distance fiber loop transmission of high-rate single-channel non-return-to-zero differential phase shift keying (NRZ-DPSK) modulated signals. The total length of the optical fiber loop is 414km and consists of 4 amplification sections. Each amplification stage consists of a standard single-mode fiber (SSMF) and a dispersion compensating fiber (DCF), mixed and amplified with an erbium-doped fiber amplifier / distributed Raman amplifier (EDFA / DRA) Spectra and eye diagrams of the 42.8 Gb / s differential phase-shift keying signals measured after 1, 2, and 3 loops (414 km, 828 km and 1242 km) were measured. Under the condition of single-ended detection in the receiving section, the BER (bit error rate) of the DPSK signal with receiver power is plotted in back-to-back case, 414km and 1242km transmission. The minimum bit error rate of DPSK signal after transmitting at 1242km can reach 6.3 × 10-4. After using the enhanced forward error correction (FEC) technology, can achieve error-free transmission.