基于四波混频效应的全光波长转换系统性能优化的研究
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摘要
全光波长转换技术(AOWC, All-Optical Wavelength Converter)是可以解决WDM系统阻塞率问题的关键技术之一,它可以进行波长转换,将波长为λs的信号光上携带的信号转移到波长为λc的转换光上,使得波分复用(WDM, Wavelength Division Multiplexing)系统的使用更加灵活和便捷。在WDM系统任意子网中使用同一波长,实现了可任意扩展的WDM系统。由于基于半导体激光放大器(SOA: semiconductor optical amplifier)四波混频(FWM:Four-Wave Mixing)效应的全光转换技术具有对调制格式和传输速率完全透明等优点,得到学者们的青睐,所以被广泛研究与应用,但与此同时,该技术也存在一定的不足：除了转换效率低之外,由于自发辐射噪声较大,它输出的光信噪比(OSNR:Optical Signal Noise Ratio)也较小。本论文采用转换光的转换效率、光信噪比和功率代价三项指标对这种基于SOA-FWM波长转换器的转换性能进行全面的衡量和评价。具体内容如下：
◆详细讨论了AOWC技术的研究目的和意义,全面分析了AOWC技术的分类和国内外的研究现状,分别介绍了基于各种原理的波长转换技术并分析其优缺点,其中,重点介绍了基于SOA-FWM效应全光波长转换技术。
◆介绍了马赫-曾德干涉仪(MZ, Mach-Zehnder)干涉型调制器的工作原理,并通过推导公式进一步验证工作的实现过程。在此基础上,译细研究了二进制振幅键控(OOK:On-Off Keying)、差分移相键控(DPSK:Differential Phase Shift Keying)以及差分正交相移键控(DQPSK:Differential quadrature phase-shift key)调制格式和对应它们不同占空比的调制和解调过程,通过MATLAB仿真验证各种码型的频谱图和时域图等相关信息,并对各种码型的数值模拟结果进行对比分析。
◆通过推导SOA中的传输方程和载流子速率方程,研究了SOA中的非线性效应,其中重点讨论了实现基于SOA-FWM效应全光波长转换技术的三阶非线性效应。最后详细介绍了实现基于SOA-FWM效应全光波长转换技术的工作原理。
◆根据SOA-FWM效应的基本原理,采用OptiSystem仿真平台,搭建了传输10Gbit/s OOK信号基于SOA-FWM效应的全光波长转换系统。根据该系统仿真了SOA注入电流,信号光与泵浦光波长失谐,入射信号光功率,泵浦光功率与转换效率、OSNR的关系,并针对仿真结果进行理论分析。综合讨论为获得更高转换效率、OSNR以及较低的功率代价的参数值,得到了传输10Gbit/s00K信号基于SOA-FWM效应AOWC的最优参数。
◆根据SOA-FWM效应的基本原理,采用OptiSystem仿真平台,搭建了传输40Gbit/s DPSK信号基于SOA-FWM效应的全光波长转换系统。根据该系统仿真了SOA注入电流,信号光与泵浦光波长失谐,入射信号光功率,泵浦光功率与转换效率、OSNR的关系,并针对仿真结果进行理论分析。综合讨论为获得更高转换效率、OSNR以及较低的功率代价的参数值,得到了传输40Gbit/s DPSK信号基于SOA-FWM效应AOWC的最优参数。
All-optical wavelength conversion technology is one of the key technologies that can solve the problem of the WDM system blocking rate, and will transfer the signal on the light wave to another one with a different wavelength. Because the wavelength of any subnet of the WDM system is unique, the WDM system can be arbitrarily extended. Because of the advantages of modulation format and completely transparent transfer rate, the SOA-FWM has been extensively studied by scholars in recent years, but at the same time, there is some certain lack of characteristic in this technology such as enough conversion efficiency, small the spontaneous emission noise and a proper optical signal-to-noise ratio of the output optical. In this thesis, we give a comprehensive measurement and evaluation of the SOA-FWM conversion performance, which is based on the three indicators below:conversion efficiency of the conversion light, the optical signal-to-noise ratio and the power penalty. The specific contents are as follows:
◆We discuss the purpose and significance of all-optical wavelength conversion technology, and analyze the classification and research status for it. Next we explain the difference between all-optical wavelength conversion technologies based on various principles. After that the four-wave mixing effect of the semiconductor laser amplifier-based all-optical wavelength conversion technology is highlighting information.
◆An explanation is given to show how Mach-Zehnder interferometer modulator works, and through the derivation formula we further validate the implementation process of the work. On this basis, we make the detailed study on the principle of modulation and demodulation process of the OOK、DPSK and DQPSK modulation format. Based on the simulatation of the spectrum and time-domain diagram of various modulation formats through MATLAB, we make a comparison between the simulatation and give a comphensive analysis in the end.
◆While derivate the transport equation and carrier rate equation besides the nonlinear effects in SOA, we focus on discussion on the third-order nonlinear effects in SOA-FWM effects-based all-optical wavelength conversion technology. In the last we give a detailed introduction of the realization of all-optical wavelength conversion based on SOA-FWM effect technology.
◆According to the basic principle of SOA-FWM, A10Gbit/s RZ-OOK All-optical wavelength converter stimulation system is built up based on four-wave mixing effect of semiconductor optical amplifier by OptiSystem software. With the aim to obtain higher conversion efficiency, higher optical signal-to-noise ratio and lower power penalty, this paper presented the best parameter and best working environment based on the discussion of the relationship of the3parameters-injection current to SOA, wavelength detuning,signal and pump power.
◆According to the basic principle of SOA-FWM, A40Gbit/s RZ-DPSK All-optical wavelength converter stimulation system is built up based on four-wave mixing effect of semiconductor optical amplifier by OptiSystem software. With the aim to obtain higher conversion efficiency, higher optical signal-to-noise ratio and lower power penalty, this paper presented the best parameter and best working environment based on the discussion of the relationship of the3parameters-injection current to SOA, wavelength detuning,signal and pump power.
◆详细讨论了AOWC技术的研究目的和意义,全面分析了AOWC技术的分类和国内外的研究现状,分别介绍了基于各种原理的波长转换技术并分析其优缺点,其中,重点介绍了基于SOA-FWM效应全光波长转换技术。
◆介绍了马赫-曾德干涉仪(MZ, Mach-Zehnder)干涉型调制器的工作原理,并通过推导公式进一步验证工作的实现过程。在此基础上,译细研究了二进制振幅键控(OOK:On-Off Keying)、差分移相键控(DPSK:Differential Phase Shift Keying)以及差分正交相移键控(DQPSK:Differential quadrature phase-shift key)调制格式和对应它们不同占空比的调制和解调过程,通过MATLAB仿真验证各种码型的频谱图和时域图等相关信息,并对各种码型的数值模拟结果进行对比分析。
◆通过推导SOA中的传输方程和载流子速率方程,研究了SOA中的非线性效应,其中重点讨论了实现基于SOA-FWM效应全光波长转换技术的三阶非线性效应。最后详细介绍了实现基于SOA-FWM效应全光波长转换技术的工作原理。
◆根据SOA-FWM效应的基本原理,采用OptiSystem仿真平台,搭建了传输10Gbit/s OOK信号基于SOA-FWM效应的全光波长转换系统。根据该系统仿真了SOA注入电流,信号光与泵浦光波长失谐,入射信号光功率,泵浦光功率与转换效率、OSNR的关系,并针对仿真结果进行理论分析。综合讨论为获得更高转换效率、OSNR以及较低的功率代价的参数值,得到了传输10Gbit/s00K信号基于SOA-FWM效应AOWC的最优参数。
◆根据SOA-FWM效应的基本原理,采用OptiSystem仿真平台,搭建了传输40Gbit/s DPSK信号基于SOA-FWM效应的全光波长转换系统。根据该系统仿真了SOA注入电流,信号光与泵浦光波长失谐,入射信号光功率,泵浦光功率与转换效率、OSNR的关系,并针对仿真结果进行理论分析。综合讨论为获得更高转换效率、OSNR以及较低的功率代价的参数值,得到了传输40Gbit/s DPSK信号基于SOA-FWM效应AOWC的最优参数。
All-optical wavelength conversion technology is one of the key technologies that can solve the problem of the WDM system blocking rate, and will transfer the signal on the light wave to another one with a different wavelength. Because the wavelength of any subnet of the WDM system is unique, the WDM system can be arbitrarily extended. Because of the advantages of modulation format and completely transparent transfer rate, the SOA-FWM has been extensively studied by scholars in recent years, but at the same time, there is some certain lack of characteristic in this technology such as enough conversion efficiency, small the spontaneous emission noise and a proper optical signal-to-noise ratio of the output optical. In this thesis, we give a comprehensive measurement and evaluation of the SOA-FWM conversion performance, which is based on the three indicators below:conversion efficiency of the conversion light, the optical signal-to-noise ratio and the power penalty. The specific contents are as follows:
◆We discuss the purpose and significance of all-optical wavelength conversion technology, and analyze the classification and research status for it. Next we explain the difference between all-optical wavelength conversion technologies based on various principles. After that the four-wave mixing effect of the semiconductor laser amplifier-based all-optical wavelength conversion technology is highlighting information.
◆An explanation is given to show how Mach-Zehnder interferometer modulator works, and through the derivation formula we further validate the implementation process of the work. On this basis, we make the detailed study on the principle of modulation and demodulation process of the OOK、DPSK and DQPSK modulation format. Based on the simulatation of the spectrum and time-domain diagram of various modulation formats through MATLAB, we make a comparison between the simulatation and give a comphensive analysis in the end.
◆While derivate the transport equation and carrier rate equation besides the nonlinear effects in SOA, we focus on discussion on the third-order nonlinear effects in SOA-FWM effects-based all-optical wavelength conversion technology. In the last we give a detailed introduction of the realization of all-optical wavelength conversion based on SOA-FWM effect technology.
◆According to the basic principle of SOA-FWM, A10Gbit/s RZ-OOK All-optical wavelength converter stimulation system is built up based on four-wave mixing effect of semiconductor optical amplifier by OptiSystem software. With the aim to obtain higher conversion efficiency, higher optical signal-to-noise ratio and lower power penalty, this paper presented the best parameter and best working environment based on the discussion of the relationship of the3parameters-injection current to SOA, wavelength detuning,signal and pump power.
◆According to the basic principle of SOA-FWM, A40Gbit/s RZ-DPSK All-optical wavelength converter stimulation system is built up based on four-wave mixing effect of semiconductor optical amplifier by OptiSystem software. With the aim to obtain higher conversion efficiency, higher optical signal-to-noise ratio and lower power penalty, this paper presented the best parameter and best working environment based on the discussion of the relationship of the3parameters-injection current to SOA, wavelength detuning,signal and pump power.
引文
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