本文選題：非線性光采樣　切入點：線性光采樣　出處：《北京理工大學》2014年博士論文　論文類型：學位論文

【摘要】：光纖通信正朝著超大容量、超高速和超長距離的方向發(fā)展，系統(tǒng)越來越復雜，因而對光信號性能進行實時監(jiān)測以確保光網(wǎng)絡安全可靠運行顯得尤為重要。傳統(tǒng)的基于電采樣的監(jiān)測技術受限于電子瓶頸，難以對高速信號進行分析。而全光采樣技術則克服了這一缺點，并做到速率和調(diào)制格式透明，具有廣闊的應用前景。 本文針對基于全光采樣的光性能監(jiān)測若干關鍵技術進行了研究，主要內(nèi)容包括： （1）研究了軟件同步采樣技術，采樣脈沖重復頻率無需滿足奈奎斯特采樣定律，降低了后續(xù)電處理器件的帶寬需求。研究表明，當降頻余數(shù)為零或者倒數(shù)為有限位有理數(shù)時，眼圖恢復效果差，稱為軟件同步算法的固有缺陷。分析并給出了軟件同步采樣對脈沖幅度抖動、定時抖動和寬度的要求，為采樣脈沖源的設計和制作提供了指導。 （2）對非線性偏振旋轉鎖模光纖激光器進行了數(shù)學建模，利用瓊斯矩陣描述偏振控制器，利用Giles模型描述摻鉺光纖。與已有模型相比，該模型與實際系統(tǒng)相符，具有各個參數(shù)物理意義清晰的優(yōu)點。通過仿真產(chǎn)生了半幅全寬度為622fs的脈沖，光譜寬度4.8nm，有很強的邊帶產(chǎn)生，是典型的孤子態(tài)。同時，利用該模型研究了偏振控制器方位角以及泵浦功率對脈沖的影響，結果表明隨機雙折射將使方位角可調(diào)諧范圍減小，泵浦功率過高或者過低都不能產(chǎn)生脈沖，脈沖平均功率與泵浦功率成正比。搭建了鎖模激光器，，產(chǎn)生了重復頻率為29.54MHz的采樣脈沖，中心波長1575.91nm，脈沖寬度630fs。 （3）研究了周期極化鈮酸鋰波導中的倍頻效應與和頻效應，設計了基于和頻效應的采樣光路。利用帶通濾波器對采樣脈沖進行濾波，然后進入摻鉺光纖放大器。放大后的采樣脈沖峰值功率與未濾波直接放大的結果相比，提高了10dB。討論了帶通濾波器帶寬對和頻光、倍頻光的影響，指出帶寬存在最佳值0.4nm，帶寬過大或者過小都將使采樣信號的眼圖變差。制作了光采樣示波器樣機并進行測試，可以測量12Gbit/s以上強度調(diào)制信號的眼圖，靈敏度-3dBm，對信號速率、光信噪比、色散等特性的監(jiān)測結果與商用高速電采樣示波器一致。 （4）為實現(xiàn)光采樣示波器樣機的自動測量，提出對采樣脈沖的波長進行遍歷，以采樣信號標準差最大時對應的波長作為和頻效應準相位匹配波長。數(shù)值仿真和實驗結果都表明采樣信號標準差與和頻光功率成正比，與倍頻光功率無關，證實了該方法的可行性。另外，設計了偏振分集結構，實現(xiàn)偏振無關的采樣，和頻光偏振相關性為1.67dB。利用寬光譜采樣脈沖，實現(xiàn)了對1530~1565nm波段信號光的采樣。 （5）針對傳統(tǒng)的軟件同步采樣不能獲取待采樣信號速率的問題，提出了多頻采樣法，即利用兩個重復頻率不同的采樣脈沖進行采樣，可從采樣信號中提取出真實速率。制作了腔長可調(diào)諧的采樣脈沖源，產(chǎn)生重復頻率為20.26677MHz和20.22900MHz的鎖模脈沖，對100MHz正弦信號光的速率進行恢復，結果為102.22MHz。另外，首次研究了該算法存在的兩個盲區(qū)，提出增加一次采樣以消除盲區(qū)的方法，給出了理論推導以及仿真和實驗證明。 （6）對線性采樣技術進行了初步研究，推導了線性采樣信號的表達式，給出了消除頻率偏移、相位偏移和相位噪聲的方法。利用光學混頻器、平衡探測器設計了線性采樣實驗系統(tǒng)，成功地恢復出連續(xù)光的波形和12Gbit/s強度調(diào)制信號光的眼圖，得到了1MHz2PSK信號的星座圖。
[Abstract]:Optical fiber communication is towards large capacity, high speed and long distance in the direction of development, the system becomes more and more complex, so it is important to ensure the safe and reliable operation of optical network is the real-time monitoring of optical signal performance. Electric sampling monitoring technology is limited by the electronic bottleneck based on the traditional, it is difficult for high-speed signal analysis and all-optical sampling. The technology overcomes this shortcoming, and do the rate and modulation format transparency, and has broad application prospects.
In this paper, some key technologies for optical performance monitoring based on all optical sampling are studied. The main contents are as follows:
(1) the software synchronous sampling technique, sampling pulse repetition frequency without the need to satisfy the Nyquist sampling theorem, reduces the bandwidth requirements of subsequent electric processing device. The results show that when the reduced frequency of the remainder is zero or inverse limit rational number, eye recovery effect, said the inherent defects of synchronization algorithm for software analysis. And gives the software synchronous sampling of pulse amplitude jitter, timing jitter and width requirements, provide guidance for the design and manufacture of sampling pulse source.
(2) the nonlinear polarization rotation mode-locked fiber laser is studied by mathematical modeling, the Jones matrix polarization controller, Giles model is used to describe the erbium-doped fiber. Compared with the existing models, this model is consistent with the actual system, has the advantages of clear physical meaning of each parameter. The simulation produced a half full width of 622fs pulse, spectrum width of 4.8nm, there is a strong side, is a typical soliton state. At the same time, the azimuth angle of polarization controller and the pump power of the pulse effect by using the model, results show that the random birefringence will make the azimuth tuning range decreases, the pump power is too high or too low can produce pulse, pulse the average power and pump power is proportional to. To build a mode-locked laser, the pulse repetition frequency sampling 29.54MHz, the central wavelength of 1575.91nm, pulse width of 630fs.
(3) the frequency doubling effect of periodically poled lithium niobate waveguide and the frequency and effect, designed based on optical sampling and frequency effect. By using the band-pass filter to filter the sampling pulse, and then enter the erbium-doped fiber amplifier. Compared with the direct amplification of the sampling pulse peak power and filtering results, improve the 10dB. discusses the bandwidth of the bandpass filter and the frequency of light, affecting the frequency of light, pointed out that there exists an optimum value of 0.4nm bandwidth, the bandwidth is too large or too small will make the eye diagram of sampling signal variation. The optical sampling oscilloscope prototype manufacturing and testing, can the eye diagram above 12Gbit/s intensity modulation signal measurement sensitivity of -3dBm on. Signal rate, optical signal-to-noise ratio, the monitoring results of dispersion and high speed electric commercial sampling oscilloscope.
(4) for the realization of automatic measurement of optical sampling oscilloscope prototype, proposed to traverse the sampling pulse wavelength, with sampling signal standard deviation corresponds to the maximum wavelength and frequency effect as quasi phase matching wavelength. The numerical simulation and experimental results show that the standard deviation of the sampling signal and the frequency of light power is proportional to the frequency of light has nothing to do with power, confirmed the feasibility of this method. In addition, the design of polarization diversity sampling to achieve polarization independent frequency, and polarization correlation for 1.67dB. by using wide spectrum sampling pulse, the optical sampling of 1530~1565nm band signal.
(5) the traditional software synchronous sampling can not get to be sampled signal rate problems, proposed a multi frequency sampling method, different sampling pulse sampling with two repetition frequency, can be extracted from the real rate of sampling signal. Making the cavity length tunable sampling pulse source, generating repetition frequency 20.26677MHz and 20.22900MHz mode-locked pulse, the rate of 100MHz sinusoidal signal light of the recovery, the 102.22MHz. also studied for the first time the two blind algorithm, proposed an increase in sampling to eliminate the blind method, the theoretical derivation and simulation and experimental results.
(6) of the linear sampling technique were studied. The expressions of linear sampling signal is deduced and given the elimination of frequency offset, phase offset and phase noise. Using optical mixer, balance detector design linear sampling experiment system successfully recovered from the eye diagram of continuous light intensity modulation waveform and 12Gbit/s signal light. The 1MHz2PSK signal constellation.

【學位授予單位】：北京理工大學
【學位級別】：博士
【學位授予年份】：2014
【分類號】：TN929.11

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