采用数字反向传播的112Gbit/s鲁棒和频谱高效传输的数值评估

R. Asif, Chien-Yu Lin, B. Schmauss
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摘要

我们报告了用于补偿色散和非线性的数字信号处理(DSP)模块的复杂性比较,即数字反向传播(DBP)算法。双极化正交相移键控(DP-QPSK)、双极化正交双二进制(DP-QDB)和双极化正交调幅(DP-16QAM)编码信号在1640km光纤链路上以112Gbit/s的比特率传输。本文比较了单信道(N=1)和多信道(N=10) DWDM的传输性能。在多通道系统中,10个发射机以25GHz信道间隔复用。光纤链路由大Aeff纯硅芯光纤(LA-PSCF)组成,每条光纤有20段82km,物理参数为:α=0.16dB, D=21ps(nm-km), γ=0.6(km-1 - w -1)。该链路不采用直列色散补偿器。掺铒光纤放大器(edfa)的增益为13.12dB,噪声系数为4dB。采用相分集同差相干接收机对信号进行检测。为了简化数值分析,我们忽略了偏振模色散(PMD)和激光线宽的影响。通过监控系统的误码率(BER)来评价系统性能,前向纠错(FEC)极限对应于误码率3.8×10-3。DBP算法是在相干检测后实现的,基于对数步长的分步傅里叶方法(L-DBP)。结果表明,DP-QDB可以以4-b/s/Hz的频谱效率(SE)传输112Gbit/s的信号,同时对非线性传输损伤具有更高的容纳度。通过使用DP-QDB调制,可以实现与DP-16QAM传输相比的系统性能,计算量减少60%,步长为205km。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Numerical evaluation of robust and spectrally efficient 112Gbit/s transmission employing digital backward propagation
We report on the complexity comparison of the digital signal processing (DSP) module to compensate chromatic dispersion and non-linearities, i.e. digital backward propagation (DBP) algorithm. The dual-polarization quadrature phase shift keying (DP-QPSK), dual-polarization quadrature duobinary (DP-QDB) and dual-polarization quadrature amplitude modulation (DP-16QAM) encoded signals at a bit-rate of 112Gbit/s for N-channels are transmitted over 1640km fiber link. The single channel (N=1) and multi-channel (N=10) DWDM transmission performances are compared in this paper. In case of multi-channel system, 10 transmitters are multiplexed with 25GHz channel spacing. The fiber link consists of Large Aeff Pure-Silica core fiber (LA-PSCF) with 20 spans of 82km each and has the physical parameters of: α=0.16dB, D=21ps(nm-km) and γ=0.6(km-1.W-1). No in-line optical dispersion compensator is employed in the link. Erbium-doped fiber amplifiers (EDFAs) are modelled with 13.12dB of gain and 4dB of noise figure. A phase-diversity homodyne coherent receiver is used to detect the signals. To simplify our numerical analysis, we neglect the effect of polarization mode dispersion (PMD) and laser line width. The system performances are evaluated by monitoring the bit-error-ratio (BER) and the forward error correction (FEC) limit corresponds to BER of 3.8×10-3. The DBP algorithm is implemented after the coherent detection and is based on the logarithmic step-size based split-step Fourier method (L-DBP). The results depict that DP-QDB can be used to transmit 112Gbit/s signals with an spectral efficiency (SE) of 4-b/s/Hz, but at the same time has a higher tolerance to non-linear transmission impairments. By utilizing DP-QDB modulation, comparative system performance w.r.t DP-16QAM transmission can be achieved with 60% less computations and with a step-size of 205km.
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