共查询到20条相似文献,搜索用时 125 毫秒
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《光学学报》2010,(8)
为了在10Gb/s+40Gb/s混合系统中提高光学奇偶交错滤波器的带宽利用率,提出了基于两级级联马赫-曾德尔干涉仪(MZI)的全光纤型不等带宽光学交错滤波器的设计方案。通过对耦合器分光比、干涉仪臂长差等结构参量的选择,详细分析了两级级联MZI的不等带宽交错滤波器的传输特性,并选取了理论优化计算的一组数据进行实验。数值分析和实验结果表明,该器件将50GHz的输入信号分离成信道间隔为100GHz的奇偶两路输出信号,其中在3dB处,奇数信道带宽大于30GHz用于10Gb/s传输,偶数信道带宽大于60GHz用于40Gb/s传输。该滤波器较传统的等带宽交错滤波器有更高的带宽利用率,在10Gb/s向10Gb/s+40Gb/s升级过程中作为复用/解复用器具有很大优势。 相似文献
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《光子学报》2017,(Z1)
为了改善常规马赫-曾德干涉仪型波长交错滤波器的性能,并降低光学滤波器设计过程的复杂性,将多个环形谐振腔耦合到常规马赫-曾德干涉仪的两个干涉臂上,从而可利用环形谐振腔的全通特性对光信号进行相位调制.利用数字滤波器与光学滤波器之间的相似性,将半带数字滤波器与光学波长交错滤波器相结合,设计出频谱具有对称性、通带平坦度高、精细度接近1、隔离度大于30dB的波长交错滤波器.分析表明:当微环耦合器的耦合比在10%范围内波动,或者微环的损耗系数大于0.7时,滤波器的隔离度始终高于25dB;在器件的中心波长附近,色散值接近于0.证明了所设计滤波器能够较好地适用于现有的波分复用系统.最后将多个双环谐振腔和单环谐振腔同时引入马赫-曾德干涉仪型滤波器,利用半带数字滤波器设计方法进行参数设计,计算结果表明:由双环和单环组成的复合结构的滤波器比仅仅采用多个单环的滤波器的隔离度提高约10dB. 相似文献
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提出了一种结构模型来分析由工艺引起的波导侧壁起伏对于聚合物波导光学梳状滤波器的滤波特性的影响。含氟聚酰亚胺高分子聚合物制备多级马赫一曾德尔串联型光学梳状滤波器件的工作参量为中心波长1550nm,波长间隔为0.8nm,40通道的波长交错分离。模拟计算:表明,对由高分子聚合物材料制备的多级马赫-曾德尔串联型光学梳状滤波器件,其主要影响是增大了信道之间的串扰,中心波长1550nm处的信道串扰由理想情况下的-40dB降为-12dB,极大地影响了器件的性能。在此基础上,提出一种改善光学梳状滤波器串扰性能的新结构,该结构由多级马赫-曾德尔耦合器和微环共振滤波器串接构成,40个通道的串扰改善为-0dB以下。 相似文献
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《中国光学与应用光学文摘》2006,(1)
TN248.352006010120基于注入锁模激光器的40Gb/s全光时钟提取=40Gb/sall-optical clock extraction based on the injection mode-locked laser[刊,中]/吕捷(天津大学电子信息学院光纤通信实验室.天津(300072)),于晋龙…∥光学学报.—2005,25(10).—1307-1312利用注入锁模光纤激光器进行时钟提取实验,成功地从40Gb/s伪随机码信号中提取出了40GHz时钟信号。实验中,在注入信号进入环形腔之前先通过一个马赫-曾德尔(M-Z)干涉仪,提高了注入信号中时钟频谱分量的相对大小,从而有利于时钟信号的提取。首先从10Gb/s伪随机码信号中提取出波形很… 相似文献
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设计并制作了一种马赫-曾德尔干涉仪(Mach-Zehnder Interferometer,MZI)与光纤布喇格光栅级联的光纤磁场传感器,其中MZI由相当于分光器的锥结构和相当于耦合器的花生锥结构级联组成,封装在填充了磁流体的毛细管中.由于磁流体的有效折射率会随着外界磁场强度的改变而变化,故可通过观察干涉谱的特征波长的变化来测量外界磁场强度,而光纤布喇格光栅透射峰对磁场强度不敏感.当磁场强度由0mT变化到20mT时,马赫-曾德尔干涉峰的灵敏度为0.11nm/mT.温度特性实验测得马赫-曾德尔干涉峰和光纤布喇格光栅透射峰的温度灵敏度分别为0.401 5nm/℃和0.011 4nm/℃.因此,可利用敏感矩阵实现双参量同时测量. 相似文献
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为了改善常规马赫曾德尔干涉仪(MZI)型滤波器的输出特性, 提出了一种由双耦合器和单模光纤构成的“8”字形谐振环,将该光纤谐振环与一个3 dB光纤方向耦合器相结合,利用光纤谐振环反馈回路引入的相位调节效应,选择合适的谐振环耦合角,设计出一种基于对称结构的光纤谐振环梳状滤波器,具有平坦滤波响应的输出光谱。与普通MZI型梳状滤波器和双级级联MZI型梳状滤波器相比,阻带抑制和过渡带滚降特性明显加强;与不对称结构的光纤谐振环辅助MZI型梳状滤波器相比,在考虑传输损耗的情况下,相干涉的两束光信号不存在幅度差异,降低了传输损耗对梳状滤波器消光特性的影响。 相似文献
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Huai-Wei Lu Kai-Jun Wu Yun Wei Bao-Ge Zhang Guan-Wei Luo 《Optics Communications》2012,285(6):1118-1122
In order to improve the transmission efficiency of optical-fiber communication system with 10 Gb/s + 40 Gb/s, an all-fiber interleaver with unequal passband is proposed and discussed, which is based on a two-stage cascaded Mach-Zehnder interferometer (MZI). The optimum value of structural parameters, such as splitting ratios of the couplers and the physical length differences of the interferometer arms, were chosen. One set of optimized data is validated in the experimental result. The experimental results and the theoretic analysis indicate that an all-fiber optical interleaver with 3 dB passband width in odd channels and even channels could be obtained, which having more than 60 GHz passband and 30 GHz passband, for transmission speed of 40 Gb/s and 10 Gb/s, respectively. By assigning different portions of spectrum to the 10 Gb/s and the 40 Gb/s channels, the bandwidth efficiency requirement of the 40 Gb/s channel is relieved, and therefore longer transmission distance can be achieved. 相似文献
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Lv Jie Yu Jin-Long Wang Hong-Li Li Ya-Nan Yang En-Ze 《Optical and Quantum Electronics》2007,39(14):1145-1152
All-optical clock recovery is a key technology in all-optical 3R (Re-timing, Re-shaping, Re-amplifying) regeneration. In this
paper, we demonstrate an all-optical clock recovery circuit based on injection mode-locked fiber laser. We have successfully
extracted 40 GHz optical clock pulse from 40 Gb/s pseudorandom signal. Before the injected signal goes into the ring cavity,
we make it pass a Mach–Zender interferometer (MZI) firstly. And thereby the clock component in the injected signal has been
increased relatively, which is benefit to the clock recovery. We obtain firstly 10 GHz clock signal with perfect waveform
from 10 Gb/s pseudorandom data stream, and then we extract 40 GHz clock signal from 40 Gb/s pseudorandom signal. 相似文献
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集成马赫-曾德尔热光耦合器的可调谐振环优化设计 总被引:1,自引:1,他引:0
根据耦合模理论,推导出可调谐光波导谐振环的光强和相位传递函数的表达式,并分析了可调谐谐振环的传输特性.结果表明,谐振环中集成的马赫-曾德尔耦合器的参量设定和调谐方式直接影响谐振环的谐振频率移动范围和调制功率.通过改变耦合器参量对谐振环进行优化设计,在中心波长为1550 am附近,谐振环半径2 cm,传输损耗0.08 dB/cm的情况下,实现了清晰度和最佳谐振深度的调谐,谐振频率的移动范围低于0.027 GHz,降低了谐振环对频率调制器的调频要求,同时降低了耦合器的调制功率. 相似文献
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A tunable and switchable single-longitudinal-mode (SLM) dual-wavelength fiber laser incorporating a reconfigurable dual-pass Mach-Zehnder interferometer (MZI) filter was proposed and demonstrated, which can be applied in microwave generation. By incorporating a high extinction ratio (ER) dual-pass MZI into an erbium-doped fiber ring cavity, SLM dual-wavelength lasing can be achieved even using a MZI with relatively little free spectrum range (FSR), and by beating the two wavelengths at a photodetector, a 9.76 GHz microwave signal with a 3-dB bandwidth of less than 10 kHz is obtained. Moreover, by direct linking the two outputs of the MZI, the high ER dual-pass MZI is easily reconfigured as a half FSR dual-pass MZI. Using this structure, switchable SLM dual-wavelength lasing can be conveniently realized. 相似文献
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We investigate 20 Gb/s wavelength conversion for return-to-zero differential phase-shift keying (RZ-DPSK) signal using four-wave mixing (FWM) in a semiconductor optical amplifier (SOA). We show that the 10-Gb/s RZ-DPSK signal-to-pump ratio increases up to -0.286 dB with Q factor improvement of 1.663 dB for increasing the cascadeability of optical networks. The effect of variation in bandwidth for an ideal dual-arm Mach-Zehnder interferometer (MZI) is illustrated. For different bit rates, the converted power signal is investigated with increase in signal input power. We show that the quality of converted signal is best before the saturation of SOA. The dependence of four-wave mixing (FWM) efficiency and converted signal power with signal input power is also studied, and it is found that FWM efficiency decreases with increase in signal input power.
The impact of signal-to-pump power ratio, unsaturated amplifier gain, and pump power is further optimized with minimum Q factor penalty for 10-Gb/s and 20-Gb/s bit rate. We show that converted signal power increases up to power saturation level and then starts decreasing. We also show that with higher bit rate, we have a wide range of choices for pump power signal. We further investigate the quality of converted signal at 10 Gb/s, which shows an improvement over signal input power. Finally, the increase in transmission distance after wavelength conversion is investigated. 相似文献
The impact of signal-to-pump power ratio, unsaturated amplifier gain, and pump power is further optimized with minimum Q factor penalty for 10-Gb/s and 20-Gb/s bit rate. We show that converted signal power increases up to power saturation level and then starts decreasing. We also show that with higher bit rate, we have a wide range of choices for pump power signal. We further investigate the quality of converted signal at 10 Gb/s, which shows an improvement over signal input power. Finally, the increase in transmission distance after wavelength conversion is investigated. 相似文献
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Ning Chunmei Yang Aiying Cui Jianmin Shen Shikui Wu Xiangyu Sun Yunan 《Optics Communications》2011,284(5):1412-1417
Two means of high speed optical sampling covering C band and L band based on sum frequency generation (SFG) in chirped periodically poled LiNbO3(CPPLN) waveguide are studied in this paper. For the first method, arbitrary waveband inside C and L band can be sampled by tuning pump wavelength and the bandwidth is controllable by choosing suitable waveguide length and chirped coefficient of CPPLN waveguide. For another, the broad bandwidth covering C band and L band can be obtained with a fixed pump. The numerical simulations based on coupled-wave equations are carried out. The NRZ sequences of 10 Gb/s and 640 Gb/s transmission rate are sampled in simulation. Distinct eye diagrams and quality factors (Q) are obtained by software-synchronized algorithm. The results show that the two means of the optical sampling both can cover C band and L band. SFG in CPPLN waveguide used for optical sampling system has a broad bandwidth and more flexible selectivity. 相似文献
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Abstract We investigate 20 Gb/s wavelength conversion for return-to-zero differential phase-shift keying (RZ-DPSK) signal using four-wave mixing (FWM) in a semiconductor optical amplifier (SOA). We show that the 10-Gb/s RZ-DPSK signal-to-pump ratio increases up to ?0.286 dB with Q factor improvement of 1.663 dB for increasing the cascadeability of optical networks. The effect of variation in bandwidth for an ideal dual-arm Mach-Zehnder interferometer (MZI) is illustrated. For different bit rates, the converted power signal is investigated with increase in signal input power. We show that the quality of converted signal is best before the saturation of SOA. The dependence of four-wave mixing (FWM) efficiency and converted signal power with signal input power is also studied, and it is found that FWM efficiency decreases with increase in signal input power. The impact of signal-to–pump power ratio, unsaturated amplifier gain, and pump power is further optimized with minimum Q factor penalty for 10-Gb/s and 20-Gb/s bit rate. We show that converted signal power increases up to power saturation level and then starts decreasing. We also show that with higher bit rate, we have a wide range of choices for pump power signal. We further investigate the quality of converted signal at 10 Gb/s, which shows an improvement over signal input power. Finally, the increase in transmission distance after wavelength conversion is investigated. 相似文献