【摘要】：近年來,基于卡爾曼濾波器的光信號協(xié)同估計技術(shù)針對光信號分模塊數(shù)字信號處理中的環(huán)節(jié)代價、處理延時和調(diào)優(yōu)參數(shù)耦合等問題提出了完美的解決方案,因此迅速成為了本領(lǐng)域的研究熱點。光信號協(xié)同估計技術(shù)可以將多個數(shù)字損傷補償結(jié)構(gòu)簡并成單個DSP結(jié)構(gòu)同時進行跟蹤和補償。本文重點圍繞偏振解復(fù)用、載波相位恢復(fù)、頻偏估計領(lǐng)域協(xié)同估計技術(shù)進行深入研究,評估且提出多種協(xié)同估計方法,并結(jié)合數(shù)值仿真和實驗平臺等手段,對基于卡爾曼濾波的光信號協(xié)同估計技術(shù)的性能表現(xiàn)、應(yīng)用范圍進行驗證。在偏振態(tài)和載波相位協(xié)同估計技術(shù)研究中,本文首先提出一種用于TDHQ信號(QPSK/16QAM混合信號)的盲和偏振態(tài)、相位協(xié)同估計方案。該方案基于擴展卡爾曼濾波(EKF),并且可以同時跟蹤偏振態(tài)和載波相位。此外,不需要知道混合信號的幀結(jié)構(gòu)組成。因此,該方案可以在收斂和跟蹤階段以全盲的方式進行。文章對系統(tǒng)性能與混合格式參數(shù)、環(huán)境變量的依賴關(guān)系進行了深入研究,具體參數(shù)和變量包括功率比(PR),幀長比(FR),相位噪聲,殘留頻偏和偏振態(tài)旋轉(zhuǎn)速率;其次本文將基于EKF的偏振態(tài)和相位協(xié)同估計技術(shù)擴展運用到高階QAM系統(tǒng)中。通過考慮各種系統(tǒng)/信道條件(包括激光線寬,頻率偏移和光纖信道偏振態(tài)旋轉(zhuǎn))下濾波器調(diào)諧參數(shù)的影響,詳細研究了16QAM和64QAM情況下的EKF性能。通過仿真結(jié)果提出了不同系統(tǒng)/信道條件下的參數(shù)配置策略,研究顯示EKF性能對調(diào)制階數(shù)的依賴性。在載波相位和頻偏協(xié)同估計技術(shù)中,本文修改和建模了印度理工Ankita Jain發(fā)表的基于EKF的非線性效應(yīng)、載波相位噪聲和頻偏協(xié)同估計技術(shù)。在不考慮非線性效應(yīng)的條件下,將該方案修改并應(yīng)用于在112Gb/s PD-16QAM和PD-QPSK系統(tǒng)。通過仿真對該協(xié)同估計方案在兩種調(diào)制格式信號下可以跟蹤的最大頻偏和相位范圍進行研究,并探討和評估了該方案的估計準確度。在前面工作積累的成果上,本文提出一種基于EKF的偏振態(tài)、載波相位和頻偏三種協(xié)同估計方案。它可以在DP-QPSK和DP-16QAM兩種調(diào)制格式信號下同時實現(xiàn)跟蹤偏振狀態(tài),頻率偏移和相位噪聲。該算法具有自身快速偏振態(tài)跟蹤功能,對激光器線寬,頻率偏移的容忍性高等優(yōu)勢,已在典型系統(tǒng)環(huán)境下通過數(shù)值仿真和112Gb/s PDM-QPSK相干光通信實驗系統(tǒng)確認其跟蹤性能。因此,它還有望運用到雙偏振高階調(diào)制格式,對其快速時變激光頻率漂移和偏振狀態(tài)進行實時性能追蹤。
[Abstract]:In recent years, the cooperative estimation technology of optical signal based on Kalman filter has put forward a perfect solution to the problems of link cost, processing delay and tuning parameter coupling in the digital signal processing of optical signal submodule. Therefore, it has become the research hotspot in this field. The optical signal cooperative estimation technique can degenerate multiple digital damage compensation structures into a single DSP structure to track and compensate at the same time. In this paper, we focus on the research of polarization demultiplexing, carrier phase recovery, frequency offset estimation, and evaluate and put forward a variety of cooperative estimation methods, combined with numerical simulation and experimental platform, etc. The performance of optical signal cooperative estimation based on Kalman filter is verified. In the research of polarization state and carrier phase cooperative estimation, this paper first proposes a blind and polarization state and phase cooperative estimation scheme for TDHQ signal (QPSK/16QAM mixed signal). The scheme is based on extended Kalman filter (EKF),) and can track both polarization and carrier phase simultaneously. In addition, there is no need to know the frame structure of the mixed signal. Therefore, the scheme can be carried out in a completely blind manner in the convergence and tracking stages. The dependence of system performance on mixed format parameters and environment variables is studied in this paper. The specific parameters and variables include power ratio (PR), frame length ratio (FR), phase noise residual frequency offset and polarization rotation rate. Secondly, the polarization state and phase cooperative estimation based on EKF is extended to high order QAM systems. By considering the influence of filter tuning parameters under various system / channel conditions (including laser linewidth, frequency offset and polarization rotation of fiber channel), the EKF performance of 16QAM and 64QAM is studied in detail. Based on the simulation results, a parameter configuration strategy under different system / channel conditions is proposed, and the dependence of EKF performance on modulation order is studied. In the technology of carrier phase and frequency offset cooperative estimation, this paper modifies and models the nonlinear effect based on EKF, carrier phase noise and frequency offset co-estimation technology published by Ankita Jain. The scheme is modified and applied to 112Gb/s PD-16QAM and PD-QPSK systems without considering the nonlinear effect. The maximum frequency offset and phase range of the cooperative estimation scheme can be tracked under two modulation formats by simulation, and the estimation accuracy of the scheme is discussed and evaluated. Based on the previous achievements, this paper proposes three cooperative estimation schemes based on EKF: polarization state, carrier phase and frequency offset. It can track polarization state, frequency offset and phase noise simultaneously in DP-QPSK and DP-16QAM modulation formats. The algorithm has the advantages of fast polarization state tracking, high tolerance to laser linewidth and frequency offset, and has been confirmed by numerical simulation and 112Gb/s PDM-QPSK coherent optical communication experimental system in typical system environment. Therefore, it is also expected to be used in dual-polarization high-order modulation scheme to track the fast time-varying laser frequency drift and polarization state in real time.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN929.1

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