基于硅基的全光信號處理器件及技術(shù)
發(fā)布時間：2018-10-16 22:05
【摘要】：硅基器件在全光信號處理領(lǐng)域具有獨特的性能優(yōu)勢而且有望應(yīng)用在未來全光網(wǎng)絡(luò)和光子集成回路中。因此,本論文對基于硅基器件的全光信號處理技術(shù)進行了深入的研究。 論文中研究了基于硅基納米線波導(dǎo)中FWM效應(yīng)的全光邏輯門技術(shù)。首先利用仿真軟件,理論研究了硅基納米線波導(dǎo)中模式的有效折射率、群折射率和GVD參數(shù)隨波導(dǎo)參數(shù)的的變化規(guī)律。研制了厚/寬/長度為340nm/400nm/6.2mm的納米線波導(dǎo),測量了其FWM工作帶寬和損耗特性,結(jié)果表明器件在C-band內(nèi)的FWM轉(zhuǎn)化效率沒有明顯的變化,同時根據(jù)理論仿真結(jié)果選取了GVD參數(shù)相對較小、FWM轉(zhuǎn)化效率較高的TMoo模進行邏輯操作。首次在研制的硅基納米線波導(dǎo)上利用FWM效應(yīng)實現(xiàn)了40GBaud QPSK信號的全光邏輯異或門操作,邏輯門信號的眼圖清晰張開,但誤碼率在10-6處出現(xiàn)曲線臺階。分析表明其主要原因是高功率下器件的非線性損耗對邏輯門信號的OSNR造成了惡化,及XPM效應(yīng)引起的非線性相位噪聲。 論文中設(shè)計并研制了基于硅基MMI耦合器的1310/1550nm的分波器。利用軟件詳細仿真了器件的各項參數(shù)對器件性能的影響,實驗上詳細測試了器件的性能。測試結(jié)果表明,兩種參數(shù)的器件在1320nm和1570nm附近可以實現(xiàn)小于-15dB的串擾。在對測試結(jié)果與理論仿真之間的差別進行了詳細分析的基礎(chǔ)上,提出了器件設(shè)計進一步優(yōu)化的方案。最后介紹了微納光子器件測試平臺-高精度六維可調(diào)耦合對準系統(tǒng)的搭建工作以及系統(tǒng)自動耦合對準功能的實現(xiàn)方式。 論文中研究了基于HNLF的全光信號處理技術(shù)。首先仿真研究了基于HNLF中XPM效應(yīng)實現(xiàn)的可重構(gòu)全光邏輯門的性能,信號速率為10Gbps,仿真結(jié)果指出該方案中XOR門的性能明顯差于其他邏輯門,與實驗結(jié)果一致。優(yōu)化信號光波長和HNLF長度后結(jié)果顯示,C-band范圍內(nèi)兩路信號的波長間隔不小于5nm的情況下均可以實現(xiàn)無誤碼操作。利用雙平行調(diào)制器實現(xiàn)了寬度為3.6ps、占空比為2.88%的Sinc-Nyquist光脈沖的產(chǎn)生,并利用HNLF的脈沖非線性處理技術(shù),通過非線性效應(yīng)將脈沖的光譜展寬(增加光頻梳的根數(shù))同時壓縮脈沖的時域脈寬；最后利用硅基納米線波導(dǎo)中FWM效應(yīng)實現(xiàn)了脈沖頻譜的展寬和時域的壓縮。
[Abstract]:Silicon based devices have unique performance advantages in all optical signal processing and are expected to be used in all optical networks and photonic integrated circuits in the future. Therefore, the all-optical signal processing technology based on silicon-based devices is studied in this thesis. In this paper, all optical logic gate technology based on FWM effect in silicon nanowire waveguide is studied. Firstly, the effective refractive index, group refractive index and GVD parameters of silicon-based nanowire waveguide are studied theoretically by using simulation software. A nanowire waveguide with thickness / width / length of 340nm/400nm/6.2mm has been developed and its FWM bandwidth and loss characteristics have been measured. The results show that the FWM conversion efficiency of the device in C-band has not changed significantly. At the same time, according to the theoretical simulation results, the TMoo modules with relatively small GVD parameters and high FWM conversion efficiency are selected for logical operation. For the first time, the all-optical logic XOR gate operation of 40GBaud QPSK signal is realized by using FWM effect on the silicon-based nanowire waveguide. The eye diagram of the logic gate signal is clearly opened, but the error rate appears a curve step at 10-6. The analysis shows that the main reasons are the deterioration of the OSNR of the logic gate signal caused by the nonlinear loss of the device at high power and the nonlinear phase noise caused by the XPM effect. In this paper, a 1310/1550nm divider based on silicon based MMI coupler is designed and developed. The influence of the parameters of the device on the performance of the device is simulated in detail by using the software, and the performance of the device is tested in detail. The experimental results show that the crosstalk smaller than-15dB can be realized in the vicinity of 1320nm and 1570nm. Based on the detailed analysis of the difference between the test results and theoretical simulation, a scheme for further optimization of device design is proposed. Finally, the construction of a high precision six-dimensional adjustable coupling alignment system and the realization of automatic coupling alignment are introduced. In this paper, the all-optical signal processing technology based on HNLF is studied. Firstly, the performance of the reconfigurable all-optical logic gate based on XPM effect in HNLF is studied. The signal rate is 10Gbps. the simulation results show that the performance of the XOR gate is obviously worse than that of other logic gates, which is consistent with the experimental results. After optimizing the signal wavelength and HNLF length, the results show that the error free operation can be realized when the wavelength interval between the two signals in the C-band range is not less than 5nm. The Sinc-Nyquist optical pulse with a width of 3.6 pss and duty cycle of 2.88% is realized by using a double parallel modulator, and the nonlinear processing technique of HNLF pulse is used. The pulse spectrum is widened by nonlinear effect (increasing the root number of optical comb) and the pulse duration is compressed at the same time. Finally, the FWM effect in silicon-based nanowire waveguide is used to widen the pulse spectrum and compress the time domain.
【學(xué)位授予單位】：北京郵電大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2014
【分類號】：TN911.7
本文編號：2275770
[Abstract]:Silicon based devices have unique performance advantages in all optical signal processing and are expected to be used in all optical networks and photonic integrated circuits in the future. Therefore, the all-optical signal processing technology based on silicon-based devices is studied in this thesis. In this paper, all optical logic gate technology based on FWM effect in silicon nanowire waveguide is studied. Firstly, the effective refractive index, group refractive index and GVD parameters of silicon-based nanowire waveguide are studied theoretically by using simulation software. A nanowire waveguide with thickness / width / length of 340nm/400nm/6.2mm has been developed and its FWM bandwidth and loss characteristics have been measured. The results show that the FWM conversion efficiency of the device in C-band has not changed significantly. At the same time, according to the theoretical simulation results, the TMoo modules with relatively small GVD parameters and high FWM conversion efficiency are selected for logical operation. For the first time, the all-optical logic XOR gate operation of 40GBaud QPSK signal is realized by using FWM effect on the silicon-based nanowire waveguide. The eye diagram of the logic gate signal is clearly opened, but the error rate appears a curve step at 10-6. The analysis shows that the main reasons are the deterioration of the OSNR of the logic gate signal caused by the nonlinear loss of the device at high power and the nonlinear phase noise caused by the XPM effect. In this paper, a 1310/1550nm divider based on silicon based MMI coupler is designed and developed. The influence of the parameters of the device on the performance of the device is simulated in detail by using the software, and the performance of the device is tested in detail. The experimental results show that the crosstalk smaller than-15dB can be realized in the vicinity of 1320nm and 1570nm. Based on the detailed analysis of the difference between the test results and theoretical simulation, a scheme for further optimization of device design is proposed. Finally, the construction of a high precision six-dimensional adjustable coupling alignment system and the realization of automatic coupling alignment are introduced. In this paper, the all-optical signal processing technology based on HNLF is studied. Firstly, the performance of the reconfigurable all-optical logic gate based on XPM effect in HNLF is studied. The signal rate is 10Gbps. the simulation results show that the performance of the XOR gate is obviously worse than that of other logic gates, which is consistent with the experimental results. After optimizing the signal wavelength and HNLF length, the results show that the error free operation can be realized when the wavelength interval between the two signals in the C-band range is not less than 5nm. The Sinc-Nyquist optical pulse with a width of 3.6 pss and duty cycle of 2.88% is realized by using a double parallel modulator, and the nonlinear processing technique of HNLF pulse is used. The pulse spectrum is widened by nonlinear effect (increasing the root number of optical comb) and the pulse duration is compressed at the same time. Finally, the FWM effect in silicon-based nanowire waveguide is used to widen the pulse spectrum and compress the time domain.
【學(xué)位授予單位】：北京郵電大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2014
【分類號】：TN911.7
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