基于高非线性器件的全光逻辑信号处理的研究
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摘要
密集波分复用、光时分复用技术与高级调制格式相结合,使得光通信系统的容量一再提升。与此相对应,现有的光网络的交换能力与传输能力严重失衡。全光分组交换网络的实现是解决上述问题的一个有效方案,然而由于全光缓存和全光逻辑等信号处理器件的不成熟,全光网络技术还未能达到实用的阶段。为了实现全光网络,迫切需要发展全光信号处理技术,设计和制作低功耗,高速率的全光信号处理器件,解决数据交换过程中的信号处理问题。
全光逻辑门是全光信号处理中的关键部件之一,在很多具有交换功能的单元中都起着至关重要的作用。本论文基于高非线性光纤、半导体光放大器等高非线性器件,研究了数据选择器、数据分配器等全光组合逻辑器件的实现以及基于相位编码数据的逻辑信号处理技术。主要内容和成果包括：
1.研究分析了高非线性光纤中交叉相位调制对输入信号时域和频谱的影响,在此基础上提出了基于高非线性光纤中交叉相位调制的数据选择器方案。利用双向光纤非线性脉冲传输模型对40Gbit/s数据速率的RZ-OOK格式信号进行了仿真验证,实现了2选1数据选择器的功能。为提高所提出方案输出信号的传输性能和级联能力,进一步优化结构。通过合理的选择输入信号的波长和功率,提出并论证了单波长输出的双向光纤传输和单向传输配置方案。分析了输入信号波长、功率、滤波器中心波长以及输入信号信噪比和啁啾等参数对系统性能的影响,给出了方案设计时参数的选择原则。
2.基于光纤克尔效应的高速响应,提出了基于高非线性光纤交义相位调制的1路-2路160Gbit/s数据分配器方案。通过数值仿真验证了所提出方案的可行性,仿真结果表明在合理设置系统参数的情况下,可以获得满足无误码率操作要求的输出信号。输入信号波长、峰值功率、光纤长度等参数与输出性能的相关性被分析。分析表明,为获得优化性能,系统中光纤长度,滤波器中心波长和输入信号功率等参数需要协同考虑。讨论了40Gbit/s、80Gbit/s处理速率下系统的实现,并与160Gbit/s时的性能和参数的选择进行了对比分析。
3.研究了基于载流子速率方程的半导体光放大器分段数值模型和SOA的非简并四波混频效应,在此基础上提出了三输入的RZ/NZR-DPSK格式数据逻辑异或门和RZ-OOK格式逻辑与门方案。数值分析了所提出系统的性能与输入信号参数的相关性。该方案无需重新配置系统的参数,仅改变输入信号即可实现两输入或三输入的RZ/NRZ-DPSK格式逻辑异或门和RZ-OOK格式逻辑与门。
4.基于SOA-MZI波长转换器,研究了OOK-DPSK格式变换方案和OOK数据中“0”和“1”数据的分离方法,结合SOA中的简并四波混频首次提出了相位编码逻辑与门和或门的方案。该方案输入为OOK格式数据,输出为OOK数据对应的相位编码数据的逻辑与和或操作。结合DPSK信号的延时解调制,可以实现DPSK信号的相位逻辑操作。仿真结果验证了该方案的可行性。
The capacity of optical communication system has been increasing due to using dense wavelength division multiplexing (DWDM) and optical time division multiplexing (OTDM) technology, as well as advanced modulation formats. Meanwhile, further development of the optical communication system is limited by the bottleneck between high transporting speed in the fiber link and low switching speed in the network node. The realization of all-optical packet switching network is an effective solution for this problem. However, all-optical network technology has yet to achieve practical stage due to all-optical signal processing devices, such as the optical buffer and all-optical logic, are not mature. In order to achieve the transparent all-optical network, development of all-optical signal processing technology, design and production of low power consumption, and high speed all-optical signal processing device are urgent need to solve the problem of signal processing in the process of data exchange.
All-optical logic gate is one of the key components of all-optical signal processing and plays an important role in the all optical network switching node. Based on the highly nonlinear optical fiber and semiconductor optical amplifier, all-optical combinational logic devices, such as the data selector and distributor, as well as logic signal processing technologies based on phase encoding data have been proposed and researched. Main contents and achievements of this thesis as follows:
1. A2-to-1data selector based on the cross phase modulation in highly nonlinear fiber has been proposed and investigated through the study of the time domain and spectrum changes induced by XPM in the highly nonlinear optical fiber. Using the bidirectional optical fiber transmission model, the2-to-1data selector is demonstrated in40Gbit/s data rate when the input signal is RZ-OOK format. To improve transmission performance and scalability of the output signal, the presented scheme is further optimized. Through the reasonable choice of the wavelength and power of the input signal, two schemes based on the bidirectional and single directional transmitting of optical fiber are achieved. The dependences of performance on the signal wavelength, the peak power of input signal, center wavelength of filter, as well as the SNR and chirp parameters of input signal are calculated and discussed in detail.
2. Using high-speed response of optical fiber Kerr effect, A160Gbit/s1-to-2photonic data distributor scheme based on cross phase modulation in the high nonlinear optical fiber is numerical investigated. The feasibility of proposed scheme is verified by numerical simulation and the results show that the requirement of no bit error rate operating can be obtain by reasonable setting the system parameters. The dependences of output performance on the parameters of input signal, such as wavelength, peak power, fiber length and the wavelength of filter are analyzed. Moreover, the selection about the key parameters of system in the40Gbit/s and80Gbit/s is also researched, and the optimal results are obtained. It is manifested that the length of fiber and the center wavelength of filter should be reasonable choice due to the influence of high order nonlinear of fiber.
3. The numerical model of semiconductor optical amplifier based on the carrier rate equation and non-degenerate four-wave mixing effect of SOA are studied, and the multi-input RZ/NRZ-DPSK format data logic XOR gate and RZ-OOK format logic AND gate are put forward. In the proposed scheme, it does not need to reconfigure the parameters of the system, only change the input signal, two or three input DPSK format logic XOR gate and RZ-OOK format logic AND gate can be realized. The dependence the proposed system performance on the input signal parameters are simulation analysis.
4. The phase coding logic AND gate and OR gate is proposed based on the SOA-MZI wavelength converter, OOK-BPSK format converter and the degenerate four wave mixing of SOA. In the scheme, the input signal are OOK format data and the output data are phase coded data corresponding to logic AND and OR operation of input signals. It can also realize the phase AND and OR logic operation of DPSK signal by Combining with delay demodulation of DPSK signal.
全光逻辑门是全光信号处理中的关键部件之一,在很多具有交换功能的单元中都起着至关重要的作用。本论文基于高非线性光纤、半导体光放大器等高非线性器件,研究了数据选择器、数据分配器等全光组合逻辑器件的实现以及基于相位编码数据的逻辑信号处理技术。主要内容和成果包括：
1.研究分析了高非线性光纤中交叉相位调制对输入信号时域和频谱的影响,在此基础上提出了基于高非线性光纤中交叉相位调制的数据选择器方案。利用双向光纤非线性脉冲传输模型对40Gbit/s数据速率的RZ-OOK格式信号进行了仿真验证,实现了2选1数据选择器的功能。为提高所提出方案输出信号的传输性能和级联能力,进一步优化结构。通过合理的选择输入信号的波长和功率,提出并论证了单波长输出的双向光纤传输和单向传输配置方案。分析了输入信号波长、功率、滤波器中心波长以及输入信号信噪比和啁啾等参数对系统性能的影响,给出了方案设计时参数的选择原则。
2.基于光纤克尔效应的高速响应,提出了基于高非线性光纤交义相位调制的1路-2路160Gbit/s数据分配器方案。通过数值仿真验证了所提出方案的可行性,仿真结果表明在合理设置系统参数的情况下,可以获得满足无误码率操作要求的输出信号。输入信号波长、峰值功率、光纤长度等参数与输出性能的相关性被分析。分析表明,为获得优化性能,系统中光纤长度,滤波器中心波长和输入信号功率等参数需要协同考虑。讨论了40Gbit/s、80Gbit/s处理速率下系统的实现,并与160Gbit/s时的性能和参数的选择进行了对比分析。
3.研究了基于载流子速率方程的半导体光放大器分段数值模型和SOA的非简并四波混频效应,在此基础上提出了三输入的RZ/NZR-DPSK格式数据逻辑异或门和RZ-OOK格式逻辑与门方案。数值分析了所提出系统的性能与输入信号参数的相关性。该方案无需重新配置系统的参数,仅改变输入信号即可实现两输入或三输入的RZ/NRZ-DPSK格式逻辑异或门和RZ-OOK格式逻辑与门。
4.基于SOA-MZI波长转换器,研究了OOK-DPSK格式变换方案和OOK数据中“0”和“1”数据的分离方法,结合SOA中的简并四波混频首次提出了相位编码逻辑与门和或门的方案。该方案输入为OOK格式数据,输出为OOK数据对应的相位编码数据的逻辑与和或操作。结合DPSK信号的延时解调制,可以实现DPSK信号的相位逻辑操作。仿真结果验证了该方案的可行性。
The capacity of optical communication system has been increasing due to using dense wavelength division multiplexing (DWDM) and optical time division multiplexing (OTDM) technology, as well as advanced modulation formats. Meanwhile, further development of the optical communication system is limited by the bottleneck between high transporting speed in the fiber link and low switching speed in the network node. The realization of all-optical packet switching network is an effective solution for this problem. However, all-optical network technology has yet to achieve practical stage due to all-optical signal processing devices, such as the optical buffer and all-optical logic, are not mature. In order to achieve the transparent all-optical network, development of all-optical signal processing technology, design and production of low power consumption, and high speed all-optical signal processing device are urgent need to solve the problem of signal processing in the process of data exchange.
All-optical logic gate is one of the key components of all-optical signal processing and plays an important role in the all optical network switching node. Based on the highly nonlinear optical fiber and semiconductor optical amplifier, all-optical combinational logic devices, such as the data selector and distributor, as well as logic signal processing technologies based on phase encoding data have been proposed and researched. Main contents and achievements of this thesis as follows:
1. A2-to-1data selector based on the cross phase modulation in highly nonlinear fiber has been proposed and investigated through the study of the time domain and spectrum changes induced by XPM in the highly nonlinear optical fiber. Using the bidirectional optical fiber transmission model, the2-to-1data selector is demonstrated in40Gbit/s data rate when the input signal is RZ-OOK format. To improve transmission performance and scalability of the output signal, the presented scheme is further optimized. Through the reasonable choice of the wavelength and power of the input signal, two schemes based on the bidirectional and single directional transmitting of optical fiber are achieved. The dependences of performance on the signal wavelength, the peak power of input signal, center wavelength of filter, as well as the SNR and chirp parameters of input signal are calculated and discussed in detail.
2. Using high-speed response of optical fiber Kerr effect, A160Gbit/s1-to-2photonic data distributor scheme based on cross phase modulation in the high nonlinear optical fiber is numerical investigated. The feasibility of proposed scheme is verified by numerical simulation and the results show that the requirement of no bit error rate operating can be obtain by reasonable setting the system parameters. The dependences of output performance on the parameters of input signal, such as wavelength, peak power, fiber length and the wavelength of filter are analyzed. Moreover, the selection about the key parameters of system in the40Gbit/s and80Gbit/s is also researched, and the optimal results are obtained. It is manifested that the length of fiber and the center wavelength of filter should be reasonable choice due to the influence of high order nonlinear of fiber.
3. The numerical model of semiconductor optical amplifier based on the carrier rate equation and non-degenerate four-wave mixing effect of SOA are studied, and the multi-input RZ/NRZ-DPSK format data logic XOR gate and RZ-OOK format logic AND gate are put forward. In the proposed scheme, it does not need to reconfigure the parameters of the system, only change the input signal, two or three input DPSK format logic XOR gate and RZ-OOK format logic AND gate can be realized. The dependence the proposed system performance on the input signal parameters are simulation analysis.
4. The phase coding logic AND gate and OR gate is proposed based on the SOA-MZI wavelength converter, OOK-BPSK format converter and the degenerate four wave mixing of SOA. In the scheme, the input signal are OOK format data and the output data are phase coded data corresponding to logic AND and OR operation of input signals. It can also realize the phase AND and OR logic operation of DPSK signal by Combining with delay demodulation of DPSK signal.
引文
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