半导体光放大器的光网络若干关键功能中的应用研究
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摘要
本文围绕半导体光放大器(SOA)在光网络中的光源、光交换节点、微波和光纤融合等三个关键功能中的应用展开研究,内容包括各种光纤环形激光器、全光时钟恢复技术、全光超宽带信号产生和调制技术等。概括全文,我们的研究成果和贡献主要包括以下几个方面：
(1)提出并数值研究了一种使用强度调制器的损耗调制和SOA的非线性偏振旋转(NPR)效应的主、被动锁模光纤环形激光器；提出并实验研究了一种基于SOA的增益损耗调制和单端SOA的NPR效应的主、被动锁模光纤环形激光器；提出并实验研究了一种使用色散补偿光纤和光纤延时干涉仪的波长可切换的锁模光纤环形激光器,仅通过调节可调光延时线即可实现11个波长的依次切换。
(2)提出并实验研究了一种使用SOA和法布里-珀罗半导体光放大器(FP-SOA)的L波段波长可调谐多波长锁模光纤激光器,可同时产生锁定在10 GHz的19个振荡波长,并且振荡波长带宽和信道间隔可以方便地调谐；提出并实验研究了一种包含两个SOA和一个双通马赫-曾德尔干涉仪(MZI)的多波长连续波光纤环形激光器,实现了稳定的82个波长同步振荡,在同等条件下比使用传统MZI的激光器产生的波长梳数目提高12个；提出并实验研究了一种包含双通MZI的波长可调谐、可切换的单纵模双波长掺铒光纤激光器,使用双通MZI提高了梳状滤波器的消光比,有效抑制模式竞争,并且可通过改变光纤跳线,实现激光器输出波长的切换。
(3)提出并实验研究了使用保偏光纤环镜滤波器和一个SOA锁模光纤环形激光器实现20Gbit/s非归零-差分相移键控(NRZ-DPSK)数据的波长可调谐全光时钟恢复；提出并实验研究了使用基于单端SOA的NPR效应的锁模光纤环形激光器的全光时钟恢复机制,通过调整偏振控制器,可以使其工作在类似于饱和透射体的工作状态,实现脉冲振幅均衡的时钟输出。
(4)提出并实验研究了一种基于多量子阱(MQW) FP-SOA主动滤波器和非线性偏振开关(SNPS)的单波长和多波长归零(RZ)数据全光时钟恢复的新方法；提出并实验研究了使用MQW FP-SOA主动滤波器和SNPS从NRZ和NRZ-DPSK调制格式数据中直接提取时钟,不需要增加任何额外的器件来进行数据格式转换或预处理；通过数值计算揭示了时钟脉冲振幅均衡度和FP-SOA端面反射率的关系,并实验研究了使用具有适当端面反射率的单个MQW FP-SOA从输入的单波长和多波长RZ调制格式数据中实现全光时钟恢复。
(5)提出并实验研究了基于单个偏振干涉仪(PI)的光子超宽带脉冲产生方案,将暗RZ信号输入到单个PI中,通过调整PC,可获得一对极性相反的超宽带monocycle脉冲和一个超宽带doublet脉冲；提出并实验研究了使用SOA级联一个PI的光子超宽带高斯脉冲的产生和全光调制方案。通过调整偏振控制器,正、负极性的超宽带monocycle和doublet脉冲可全部获得。利用SOA-XGM效应和PI的微分功能,可实现超宽带信号的脉冲形状调制；提出并实验研究了一种基于SOA级联DWDM的光子超宽带产生和全光调制方案。改变探测光波长可产生正、负极性的超宽带monocycle和doublet高斯脉冲,可实现了多通道UWB信号产生和二进制相位编码的UWB信号产生。如果控制光信号本身包含信息,还可实现超宽带信号的脉冲幅度调制。
The application of semiconductor optical amplifier (SOA) for three key functions in optical communications networks are investgatated, including optical source, optical switching nodes, integration of microwave and fiber technologies. A variety of fiber ring laser, all-optical clock recovery techniques, and all-optical ultrawideband (UWB) signal generation and modulation techniques are presented and demonstrated. Our research achievements and contributions are summarized as following:
(1) A novel actively and passively mode-locked SOA fiber ring laser was presented and demonstrated, where SOA provided cavity gain and introduced nonlinear polarization rotation (NPR), whereas, intensity modulator not only acted as modulator but also polarizer. A fiber-ring laser incorporating dual mode-locking mechanisms is also presented and demonstrated, where a multi-quantum well (MQW) SOA acts as active loss modulator and a reflective SOA introduce NPR and function as a saturable absorber. In addition, we also demonstrate a fiber ring laser with a segment of dispersion compensation fiber and a delayed interferometer with temperature control, which is able to switch eleven wavelengths one by one.
(2) We present and demonstrate a multi-wavelength mode-locked fiber ring laser incorporating a SOA and a Fabry-Perot semiconductor optical amplifier (FP-SOA), which can generate 19 synchronized wavelength channels with the extinction ratio of about 21 dB, each mode-locked at 10 GHz. We also demonstrate a multi-wavelength SOA fiber ring laser with a dual-pass Mach-Zehnder interferometer (MZI) filter, a stable 82 wavelengths with a wavelength spacing of 40 GHz simultaneous oscillate is acquired. In addition, a wavelength tunable and switchable single-longitudinal-mode dual-wavelength erbium-doped fiber laser using a dual-pass MZI comb filter is also presented and demonstrated.
(3) All-optical clock recovery (AOCR) from 20 Gbit/s nonreturn-to-zero differential phase-shift-keying (NRZ-DPSK) signals are demonstrated experimentally by using a polarization-maintaining fiber loop mirror filter (PMF-LMF) and a SOA mode-locked fiber ring laser. In addition, we also report an AOCR technology with pulse-amplitude-equalization scheme using NPR of reflective SOA (RSOA).
(4) We experimentally demonstrate a novel AOCR scheme for the RZ data with single-and multiwavelength. This scheme is mainly based on clock-like pulse generation from an active filter with a MQW FP-SOA and amplitude-equalization scheme with self-nonlinear polarization switching (SNPS). We also demonstrated the same scheme is used for AOCR from the input NRZ and NRZ-DPSK data without any preprocessing measures. In addition, we presented and demonstrated AOCR from the input RZ data with single-and multiwavelength, using a single MQW FP-SOA, without any additional amplitude equalization measure. The facets reflectivity of FP-SOA influence on amplitude equalization of recovered clock was numerically investigated.
(5) We proposed and demonstrated an all-optical polarity-and shape-switchable UWB Gaussian pulses generation scheme using a single polarization interferometer (PI) or a SOA cascaded by a PI. Moreover, if a NRZ control signal is introduced into the SOA, utilizing cross-gain modulation (XGM) effect of the SOA, all-optical modulation to UWB signals can be realized. We also present and demonstrate an all-optical UWB Gaussian pulses generation and modulation scheme using a SOA cascaded by a DWDM.
(1)提出并数值研究了一种使用强度调制器的损耗调制和SOA的非线性偏振旋转(NPR)效应的主、被动锁模光纤环形激光器；提出并实验研究了一种基于SOA的增益损耗调制和单端SOA的NPR效应的主、被动锁模光纤环形激光器；提出并实验研究了一种使用色散补偿光纤和光纤延时干涉仪的波长可切换的锁模光纤环形激光器,仅通过调节可调光延时线即可实现11个波长的依次切换。
(2)提出并实验研究了一种使用SOA和法布里-珀罗半导体光放大器(FP-SOA)的L波段波长可调谐多波长锁模光纤激光器,可同时产生锁定在10 GHz的19个振荡波长,并且振荡波长带宽和信道间隔可以方便地调谐；提出并实验研究了一种包含两个SOA和一个双通马赫-曾德尔干涉仪(MZI)的多波长连续波光纤环形激光器,实现了稳定的82个波长同步振荡,在同等条件下比使用传统MZI的激光器产生的波长梳数目提高12个；提出并实验研究了一种包含双通MZI的波长可调谐、可切换的单纵模双波长掺铒光纤激光器,使用双通MZI提高了梳状滤波器的消光比,有效抑制模式竞争,并且可通过改变光纤跳线,实现激光器输出波长的切换。
(3)提出并实验研究了使用保偏光纤环镜滤波器和一个SOA锁模光纤环形激光器实现20Gbit/s非归零-差分相移键控(NRZ-DPSK)数据的波长可调谐全光时钟恢复；提出并实验研究了使用基于单端SOA的NPR效应的锁模光纤环形激光器的全光时钟恢复机制,通过调整偏振控制器,可以使其工作在类似于饱和透射体的工作状态,实现脉冲振幅均衡的时钟输出。
(4)提出并实验研究了一种基于多量子阱(MQW) FP-SOA主动滤波器和非线性偏振开关(SNPS)的单波长和多波长归零(RZ)数据全光时钟恢复的新方法；提出并实验研究了使用MQW FP-SOA主动滤波器和SNPS从NRZ和NRZ-DPSK调制格式数据中直接提取时钟,不需要增加任何额外的器件来进行数据格式转换或预处理；通过数值计算揭示了时钟脉冲振幅均衡度和FP-SOA端面反射率的关系,并实验研究了使用具有适当端面反射率的单个MQW FP-SOA从输入的单波长和多波长RZ调制格式数据中实现全光时钟恢复。
(5)提出并实验研究了基于单个偏振干涉仪(PI)的光子超宽带脉冲产生方案,将暗RZ信号输入到单个PI中,通过调整PC,可获得一对极性相反的超宽带monocycle脉冲和一个超宽带doublet脉冲；提出并实验研究了使用SOA级联一个PI的光子超宽带高斯脉冲的产生和全光调制方案。通过调整偏振控制器,正、负极性的超宽带monocycle和doublet脉冲可全部获得。利用SOA-XGM效应和PI的微分功能,可实现超宽带信号的脉冲形状调制；提出并实验研究了一种基于SOA级联DWDM的光子超宽带产生和全光调制方案。改变探测光波长可产生正、负极性的超宽带monocycle和doublet高斯脉冲,可实现了多通道UWB信号产生和二进制相位编码的UWB信号产生。如果控制光信号本身包含信息,还可实现超宽带信号的脉冲幅度调制。
The application of semiconductor optical amplifier (SOA) for three key functions in optical communications networks are investgatated, including optical source, optical switching nodes, integration of microwave and fiber technologies. A variety of fiber ring laser, all-optical clock recovery techniques, and all-optical ultrawideband (UWB) signal generation and modulation techniques are presented and demonstrated. Our research achievements and contributions are summarized as following:
(1) A novel actively and passively mode-locked SOA fiber ring laser was presented and demonstrated, where SOA provided cavity gain and introduced nonlinear polarization rotation (NPR), whereas, intensity modulator not only acted as modulator but also polarizer. A fiber-ring laser incorporating dual mode-locking mechanisms is also presented and demonstrated, where a multi-quantum well (MQW) SOA acts as active loss modulator and a reflective SOA introduce NPR and function as a saturable absorber. In addition, we also demonstrate a fiber ring laser with a segment of dispersion compensation fiber and a delayed interferometer with temperature control, which is able to switch eleven wavelengths one by one.
(2) We present and demonstrate a multi-wavelength mode-locked fiber ring laser incorporating a SOA and a Fabry-Perot semiconductor optical amplifier (FP-SOA), which can generate 19 synchronized wavelength channels with the extinction ratio of about 21 dB, each mode-locked at 10 GHz. We also demonstrate a multi-wavelength SOA fiber ring laser with a dual-pass Mach-Zehnder interferometer (MZI) filter, a stable 82 wavelengths with a wavelength spacing of 40 GHz simultaneous oscillate is acquired. In addition, a wavelength tunable and switchable single-longitudinal-mode dual-wavelength erbium-doped fiber laser using a dual-pass MZI comb filter is also presented and demonstrated.
(3) All-optical clock recovery (AOCR) from 20 Gbit/s nonreturn-to-zero differential phase-shift-keying (NRZ-DPSK) signals are demonstrated experimentally by using a polarization-maintaining fiber loop mirror filter (PMF-LMF) and a SOA mode-locked fiber ring laser. In addition, we also report an AOCR technology with pulse-amplitude-equalization scheme using NPR of reflective SOA (RSOA).
(4) We experimentally demonstrate a novel AOCR scheme for the RZ data with single-and multiwavelength. This scheme is mainly based on clock-like pulse generation from an active filter with a MQW FP-SOA and amplitude-equalization scheme with self-nonlinear polarization switching (SNPS). We also demonstrated the same scheme is used for AOCR from the input NRZ and NRZ-DPSK data without any preprocessing measures. In addition, we presented and demonstrated AOCR from the input RZ data with single-and multiwavelength, using a single MQW FP-SOA, without any additional amplitude equalization measure. The facets reflectivity of FP-SOA influence on amplitude equalization of recovered clock was numerically investigated.
(5) We proposed and demonstrated an all-optical polarity-and shape-switchable UWB Gaussian pulses generation scheme using a single polarization interferometer (PI) or a SOA cascaded by a PI. Moreover, if a NRZ control signal is introduced into the SOA, utilizing cross-gain modulation (XGM) effect of the SOA, all-optical modulation to UWB signals can be realized. We also present and demonstrate an all-optical UWB Gaussian pulses generation and modulation scheme using a SOA cascaded by a DWDM.
引文
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