基于硅基的全光信号处理器件及技术
发布时间：2018-10-16 22:05
【摘要】：硅基器件在全光信号处理领域具有独特的性能优势而且有望应用在未来全光网络和光子集成回路中。因此,本论文对基于硅基器件的全光信号处理技术进行了深入的研究。 论文中研究了基于硅基纳米线波导中FWM效应的全光逻辑门技术。首先利用仿真软件,理论研究了硅基纳米线波导中模式的有效折射率、群折射率和GVD参数随波导参数的的变化规律。研制了厚/宽/长度为340nm/400nm/6.2mm的纳米线波导,测量了其FWM工作带宽和损耗特性,结果表明器件在C-band内的FWM转化效率没有明显的变化,同时根据理论仿真结果选取了GVD参数相对较小、FWM转化效率较高的TMoo模进行逻辑操作。首次在研制的硅基纳米线波导上利用FWM效应实现了40GBaud QPSK信号的全光逻辑异或门操作,逻辑门信号的眼图清晰张开,但误码率在10-6处出现曲线台阶。分析表明其主要原因是高功率下器件的非线性损耗对逻辑门信号的OSNR造成了恶化,及XPM效应引起的非线性相位噪声。 论文中设计并研制了基于硅基MMI耦合器的1310/1550nm的分波器。利用软件详细仿真了器件的各项参数对器件性能的影响,实验上详细测试了器件的性能。测试结果表明,两种参数的器件在1320nm和1570nm附近可以实现小于-15dB的串扰。在对测试结果与理论仿真之间的差别进行了详细分析的基础上,提出了器件设计进一步优化的方案。最后介绍了微纳光子器件测试平台-高精度六维可调耦合对准系统的搭建工作以及系统自动耦合对准功能的实现方式。 论文中研究了基于HNLF的全光信号处理技术。首先仿真研究了基于HNLF中XPM效应实现的可重构全光逻辑门的性能,信号速率为10Gbps,仿真结果指出该方案中XOR门的性能明显差于其他逻辑门,与实验结果一致。优化信号光波长和HNLF长度后结果显示,C-band范围内两路信号的波长间隔不小于5nm的情况下均可以实现无误码操作。利用双平行调制器实现了宽度为3.6ps、占空比为2.88%的Sinc-Nyquist光脉冲的产生,并利用HNLF的脉冲非线性处理技术,通过非线性效应将脉冲的光谱展宽(增加光频梳的根数)同时压缩脉冲的时域脉宽；最后利用硅基纳米线波导中FWM效应实现了脉冲频谱的展宽和时域的压缩。
[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.
【学位授予单位】：北京邮电大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：TN911.7
本文编号：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.
【学位授予单位】：北京邮电大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：TN911.7
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