Dynamic Performance and Speed Requirement of Polarization Mode Dispersion Compensators

To study the dynamic performance of a polarizationmode-dispersion compensator (PMDC), a continuous PMD model and a dynamic PMDC model are presented. The continuous PMD model generates continuous PMD and state of polarization (SOP) variations. The statistics of the SOP variation generated by the continuous PMD model follows the Rayleigh distribution, and the SOP variation amplitude scales with the square root of sampling-time interval. The results are compared with those of a numerical and a commercial polarization scrambler, and the difference of the SOP variation characteristics between the PMD model and the polarization scramblers is explained. The continuous PMD model and the dynamic PMDC model are used to study the dynamic performance and speed requirement of a two-stage PMDC. The speed requirement of the PMDC is quantified in the SOP variation in one PMDC loop cycle. The authors found that when the SOP variation is within 3deg in one PMDC loop cycle, the dynamic PMD and SOP changes virtually does not cause any degradation in the PMDC performance     

80 Gbit/s pulsewidth-maintained wavelength conversion based on HNLDSF-NOLM including transmission over 80 km of conventional SMF

80 Gbit/s pulsewidth-maintained wavelength conversion based on a high-nonlinearity dispersion shifted fibre nonlinear optical loop mirror (DSF-NOLM) is realised and penalty-free transmission over 80 km conventional single mode fibre and 12 km dispersion compensating fibre of the converted signal is demonstrated for the first time     

偏振模色散后补偿器的工作方式分析

从理论上研究了一阶和高阶偏振模色散（PMD）后补偿器工作时补偿光纤与被补偿光纤的PMD矢量在Stokes空间中的相对位置关系，由此提出了其在小PMD和大PMD情况下可能的工作方式，以故障概率为指标，数值结果表明补偿器在这些工作方式下的补偿性能与实际补孙器所能达到的最佳性能一致。     

42.8-Gb/s RZ-DQPSK Transmission With FBG-Based In-Line Dispersion Compensation

Phase ripple impairments induced through cascaded fiber Bragg gratings (FBGs) are discussed for 42.8-Gb/s transmission. We show the feasibility of transmission over 1140 km (12 times 95 km) using return-to-zero differential quadrature phase-shift keying modulation and FBG-only dispersion compensation. We further compare FBGs with dispersion-compensating fiber for dispersion compensation and analyze the influence of wavelength detuning.     

Demonstration of a Bidirectional 80-km-Reach DWDM-PON With 8-Gb/s Capacity

A bidirectional 80-km-reach 64-channel dense wavelength-division-multiplexing passive optical network with 50-GHz channel spacing based on wavelength-locked Fabry-Peacuterot laser diodes is demonstrated. By changing the position of the broadband light source (BLS) for the upstream channels to the remote node, both the need for a high-power BLS and the power penalties induced by backscattering are overcome. Packet-loss-free transmission is obtained, guaranteeing 125 Mb/s per channel (8-Gb/s capacity in a single direction) without the support of an optical amplifier     

色散补偿值对高速长距离传输系统的影响

本文采用数值模拟研究了速率为１０Ｇｂｉｔ／ｓ的色散补偿传输系统，分析了不同色散补偿值对系统性能的影响。数值模拟发现，适当的欠补偿能够提高系统性能。这个结论对实际应用有一定的指导作用。     

Demonstration of 40-Gb/s Low-Group-Delay-Ripple Tunable Dispersion Compensator Using Angled Etalon With Multiple Reflections

We experimentally demonstrated a high-performance tunable dispersion compensator with a simple configuration using an angled etalon with multiple reflections. We developed a group-delay model of the compensator and designed to suppress the group-delay ripple (GDR). A tunable dispersion range of plusmn250ps/nm and a low <2.0-ps GDR were shown     

一种基于光纤光栅传输色散特性的可调谐色散补偿方案

分析了光纤光栅在禁带附近的光特性,提出了一种基于光纤光栅传输色散特性和应用变特性的新的色散补偿方案－级联光纤光栅可调谐色散补偿;从理论和实验两方面分析了它的色散补偿的可调谐性,并进行了数值模拟;讨论了这种方案在光纤通信方面特别在密集波分复用系统中的应用前景。     

The Effect of Polarization Mode Dispersion on the Transmission System Using Dispersion Compensation Fiber

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10-Gb/s, 80-km SMF Transmission From 0 to 80 $^{circ}$C by Using L-Band InGaAlAs-MQW Electroabsorption Modulated Laser With Twin Waveguide Structure

A 10-Gbit/s, 1.58-mu m, InGaAlAs electroabsorption modulator (EAM) integrated distributed-feedback (DFB) laser (EML) with a twin waveguide (TWG) structure is operated experimentally over a wide temperature range of 0 to 80degC. We introduce an InGaAlAs multi-quantum well (MQW) system for both LD and EAM MQWs, because this material has temperature-tolerant characteristics. These layers are grown using single step epitaxial growth, and the device was fabricated with a very simple process. Moreover, successful transmission through an 80-km single-mode fiber (SMF) was achieved with the device running at up to 80degC. These results confirm the suitability of this type of laser for use as a cost-effective and low-power consumption light source in 10-Gbit/s optical network systems.     

密集型色散管理模式中DM孤子传输特性分析

本文以经典色散管理孤子的传输特性为参照,研究了单信道40Gbit/s密集型色散管理系统内色散管理孤子的诸多传输特性,证实了密集型色散管理模式相对于经典色散管理模式的优势所在,同时给出了系统最佳传输性能与入射功率、分段数、以及脉冲初始宽度等因素的数值关系。     

高速色散控制传输系统中的三阶色散影响

给出了含三阶色散项的强色散控制准线性系统传输方程，分析了三阶色散对该系统的影响特性，并采用数值仿真比较了三阶色散对准线性系统与色散控制孤子系统的影响，指出了三阶色散补偿的必要性和补偿的精度要求。     

DPSK色散管理孤子系统的稳定传输

DPSK调制方式和色散管理孤子(DMS)传输方案相结合的新的传输机制能抵制噪声和非线性损伤,在高速多通道光传输系统中具有突出优点。采用变分法研究同时存在光纤损耗、ASE噪声、孤子互作用等多种扰动因素的DPSK色散管理孤子系统的传输特性,在频域导频滤波控制方案下,导出了孤子各特征参数随传输距离的演化方程。对40 Gb/s长距离DPSK色散管理孤子系统的传输特性进行了数值模拟,其结果和理论分析一致。并通过Optisystem软件作进一步仿真,论证了该系统零频移稳定传输的可行性。     

强度调制／直接检测（IM／DD）光纤通信系统的色散限制

本文讨论了光纤色散对ＩＭ／ＤＤ光纤通信系统再生中继距离的限制，导出了适用于各种眼图恶化量、归一化脉宽和光源线宽展宽因子，且便于工程计算的Ｂ２Ｌ表达式。通过与其它理论的比较、计算机仿真研究和对实际系统实验数据的分析，说明了该公式所得结论的正确性以及其它结果的限制条件。     

Dispersion in Shielded Planar Transmission Lines on Two-Layer Composite Substrate

The singular integral equation technique has been used to analyze a shielded planar transmission line, which allows one to calculate the dispersion characteristics of shielded microstrips on two-layer substrates as well as the effect of shielding on coplanar waveguides. Dispersion curves for suspended substrate microstrips and the variation of the relative phase velocity, with frequency, of coplanar waveguide (CPW) on alumina substrates of finite thicknesses and variable ground plane positions are presented. The results of computations with the lowest order 4 x 4 determinant show good agreement with the available data.     

RZ、CSRZ码在CBG色散补偿系统中的传输

全部利用线性啁啾光纤布拉格光栅（CBG）作色散补偿模块和在线通道滤波顺，在2500km超长距离的G．652光纤上实现10Ghps归零码（RZ）、载波抑制归零码（CSRZ）光信号的无电中继传输，并在2080km和2560km处分别对2种信号的传输性能进行了测试。CSRZ在上述2处的功率代价分别为～1dBm和～3dBm（BER-10^12，PRBS=10^23-1），RZ的功率代价分别为～3dBm和～5dBm，验证了在相同系统平台下CSRZ光信号比RZ光信号有更好的性能.     

ROF中色散对OFDM信号传输性能影响的研究

建立了一套适合于研究OFDM信号在ROF光传输系统中传输的仿真模型。调查了光传输系统性能对OFDM信号传输质量的影响问题。针对光纤链路中色散对OFDM信号性能的影响展开讨论。给出了色散补偿前后系统性能的仿真结果,并进行分析和讨论。     

Dispersion of Picosecond Pulses in Coplanar Transmission Lines

The dispersion of coplanar-type transmission lines has been extended to the terahertz regime to examine the distortion of picosecond electrical pulses. Dispersion of coplanar waveguides is compared to equivalent microstrip lines. Agreement with available experimental data is demonstrated for coplanar strips, An approximate dispersion formula for coplanar waveguides is also reported for CAD applications.     

基于OCDM的PON监控编码技术分析

鉴于OCDM的PON监控技术在多用户和实时监控方面的优越性,提出多种编码方案.主要介绍基于OCDM的PON监控技术的1D码、2D码、1D/2D混合码以及周期码的基本原理,并研究分析各种编码方案在监控性能上的优缺点.     

色散对光纤中高斯光脉冲传播特性的影响

从麦克斯韦方程组出发,建立了光脉冲在光纤中传播的理论模型。在只考虑色散效应的情况下,对该理论模型进行进一步的研究,数值模拟出高斯光脉冲在光纤中的传输状态,并讨论了色散对光脉冲传播特性的影响。结果表明,群速度色散会增加光脉冲的宽度而波形保持不变;三阶色散会引起光脉冲的畸变。该结论对光纤的色散补偿具有一定的理论参考价值。