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本文建立了偏分复用系统中偏振模色散与信号偏振态变化引起信道串扰的数学模型, 分析了偏振模色散对偏分复用信道射频功率的影响, 并提出了适用于偏分复用系统的光域偏振模色散补偿与偏分解复用同时进行的方案: 用信道的射频功率作为反馈控制信号, 监测链路中偏振模色散和偏振态变化引起的信道串扰的大小, 用改进的粒子群优化算法对偏振控制器进行自适应控制, 同时完成偏振模色散补偿与偏分解复用. 在112 Gb/s偏分复用-差分正交相移键控(PDM-DQPSK)传输系统中仿真验证了该方案的有效性. 结果表明该方案可以使112 Gb/s-PDM-DQPSK传输系统完成自适应偏分解复用的同时, 在1 dB的光信噪比代价下, 使系统对偏振模色散的容忍度提高20 ps.
关键词:
偏分复用系统
信道串扰
偏振模色散
偏分解复用 相似文献
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An optical bandpass filter (OBF) is an important element whose properties considerably influence the output performance of a single side band multicarrier source based on a re-circulating frequency shifter. The influence of the OBF in the loop on the output spectrum is theoretically analyzed. Numerical simulations and experiments are Mso carried out. Results show that the steepness and deepness of a nonflat-top filter influence the stability of the spectrum of an output multicarrier. To obtain multicarrier output with tone to noise ratio (TNR) 〉26 dB and error vector magnitude (EVM) 〈0.25, the steepness ratio of the filter should be greater than 0.75 and deepness should be larger than 0.99. 相似文献
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A fast and reliable method to calibrate LiNbO3-based polarization controllers (PCs) presented theoretically and experimentally. Particle swarm optimization (PSO) algorithm is used as an adaptive searching algorithm. Experimental results show that PSO algorithm is powerful in calibrating LiNbO3-based multistage PCs. Only less than one minute is spent for all stages of the PC to be calibrated thoroughly. 相似文献
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High-speed polarization mode dispersion compensation in a 43-Gb/s RZ-DQPSK transmission system over 1200 km of standard single-mode fibre 下载免费PDF全文
This paper reports that the designed optical polarization mode dispersion compensator shows a good performance under the real-time variation of differential group delay, state of polarization and principal state of polarization in a (40 × 43)-Gb/s dense-wavelength-multiplexing, 1200-km enhanced return-to-zero differential-quadrature-phase-shift-keying (RZ-DQPSK) system. The polarization mode dispersion tolerance of the system is improved by 26 ps using the optical polarization mode dispersion compensator. The short and long time stabilities are tested with the bit error ratio recorded.vspace1mm 相似文献
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Factors affecting the performance of a multi-tone carrier source based re-circulating frequency shifter 下载免费PDF全文
Generation of single-sideband (SSB) multi-carrier source based on a recirculating frequency shifter (RFS) is anal-ysed theoretically and realized experimentally.The effects of affecting factors originating from the deviation from the right operation bias voltage and unbalanced amplitude,and the phase of the radio frequency (RF) drive signals on the performance of the multi-tone source are discussed in detail.Based on the theoretical analysis,high-quality 50-tone out-put is successfully realized.Experiments under some implementation imperfections are also carried out.The imperfect and low-quality output results are in good agreement with theoretical analysis. 相似文献
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An Experiment for Generating the 14-Tone Stable Carriers Using Recirculating Frequency Shifter 下载免费PDF全文
In experiment, the generation of 14-tone stable carriers with recirculating frequency shifter is realized. Some factors that impact the performance of the carrier generation are discussed. It is experimentally found that the balance and the insertion loss of the inphase/quadrature (I/Q,) modulator, the accurate π/2 phase difference and equal power level of two rf signals which are applied to the two ports of the I/Q, modulator, the gain of the optical amplifier, the bandwidth and sharp window spectrum of the tunable filter and the stability of the optical signals' states of polarization fed into I/Q, modulator, play important roles in the generation of a stable multi-tone carrier source. By employing appropriate techniques we obtain 14-tone stable carriers in the experiment. 相似文献
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