Broad-band light source using mutually injected Fabry-Pe/spl acute/rot laser diodes for WDM-PON

We propose and demonstrate a new broad-band light source (BLS) for a wavelength division multiplexing-passive optical network (WDM-PON) based on the wavelength locked Fabry-Pe/spl acute/rot laser diodes (F-P LDs). By mutual injection between two antireflection-coated F-P LDs, we realized a broad-band light with a low relative intensity noise. By using the proposed BLS for wavelength locking of the F-P LD, we achieve color-free operation of the optical network termination with Manchester coded data. We also demonstrate a WDM-PON based on the proposed BLS.     

放大自发辐射注入波长锁定法布里-珀罗激光器

波分复用无源光网络(WDM-PON)被认为是接入网的最终解决方案,基于放大自发辐射(ASE)注入波长锁定法布里-珀罗(F-P)激光器的WDM-PON由于其价格低廉和容易实现颜色无关操作而受到极大关注.实验研究了ASE注入波长锁定F-P激光器的ASE增益、边模抑制比(SMSR)和相对强度噪声(RIN)随F-P激光器注入电流和ASE注入功率的变化关系,理论模拟了ASE注入功率和增益一定时,F-P激光器注入电流随其前端面反射率的变化关系,并从实验上进行了验证.研究结果表明,当F-P激光器的注入电流为阈值电流的1.3～1.7倍时,能获得满足应用需要的相对强度噪声和边模抑制比.对于一定的ASE注入功率和输出功率,存在使注入电流最小的最佳前端面反射率.     

基于注入锁定的WDM—PON系统研究

WDM-PON规模应用的技术难点主要集中在光器件方面,特别是ONU光源。本文对基于FP-LD和RSOA注入锁定的WDM-PON进行了分析,研究目标是实现无色的上行传输。     

A Low-Noise Broadband Light Source for a WDM-PON Based on Mutually Injected Fabry–PÉrot Laser Diodes With RF Modulation

We demonstrated improved performance of a low-noise broadband light source (BLS) based on mutually injected Fabry–PÉrot laser diodes for a large capacity and high bit-rate wavelength-division-multiplexed passive optical network (WDM-PON). The 3-dB linewidth and relative intensity noise of each mode of the low-noise BLS are improved by radio-frequency modulation, where the frequency was detuned from the fundamental noise peak of the low-noise BLS. Then, a 622-Mb/s WDM-PON was demonstrated. Furthermore, a 1-Gb/s WDM-PON can be realized with Manchester coding at a channel spacing of 100 GHz. Thus, the proposed low-noise BLS can be employed to realize a highly scalable WDM-PON.      

1.25-Gb/s Operation at 50-GHz Channel Spacing Based on Intensity Noise Suppression of Wavelength-Locked Fabry–PÉrot Laser Diode

We demonstrate 1.25-Gb/s operation at 50-GHz channel spacing and 10-km single-mode fiber, which is based on a wavelength-locked Fabry-Perot laser diode (F-P LD) and an intensity noise suppression by a gain saturation of F-P LD in front of the receiver. The wavelength-locked F-P LD employs the spectrum-sliced incoherent light with narrow bandwidth of 35 GHz. The intensity noise of wavelength-locked F-P LD is suppressed about 6 dB by the F-P LD in the front of the receiver. As a result, the bit-error-rate curves exhibit the error-free performances over the detuning conditions to cover a whole mode spacing period of F-P LD.     

Noise Characteristics of a Wavelength-Locked Fabry–Perot Laser Diode

We derived a theoretical model of a wavelength-locked Fabry–Perot laser diode (F-P LD) to a sliced spectrum of externally injected amplified spontaneous emission (ASE) from wave equations. The model explains the dynamics of the wavelength-locked F-P LD. Using this model, we investigated the noise characteristics of a wavelength-locked F-P LD with respect to the various parameters, such as, the injected ASE power, the bias current of F-P LD, and the wavelength detuning. We also investigated intensity noise increment by spectral filtering in optical access networks based on wavelength-locked F-P LDs.      

WDM-PON接入技术及其最新进展

本文首先从时分复用无源光网络（TDM—PON）的不足引入波分复用无源光网络（WDM—PON）,接着介绍了ONU波长固定和可调WDM—PON,随后阐述了ONU无色和无光源WDM—PON。鉴于目前WDM-PON难以推广使用的现状,上行用TDMA替代WDMA会使WDM—PON看起来更加现实,所以本文也介绍了混合使用WDM和TDM的HPON。最后对WDM—PON与功率分配PON（PS—PON）的技术进行了比较。     

WDM-PON技术研究及实现方案(本期优秀论文)

简要介绍了WDM-PON的系统结构和工作原理,比较分析了WDM-PON技术的优势,进而研究了WDM-PON系统中的无色ONU技术和WDM/TDM混合型结构技术,并综合这两种技术提出了一种新的WDM-PON的实现方案,为将来WDM-PON接入网系统的发展提供了参考.     

波分复用无源光网络的机遇与挑战

本文主要概述了波分复用无源光网络拥有的机遇,面临的挑战及目前已发展的各种技术。首先分析了WDM-PON在下一代光接入网中可能拥有的机遇,阐明了目前WDM-PON所面临的挑战,并从ONU端光源无色化和OLT端光源中心化两方面讨论了为降低WDM-PON成本国际上目前发展的各种技术手段,并比较了各种技术的优缺点。     

一种基于相位调制环的多波长产生器的WDM-PON

本文首先简单介绍了WDM-PON的技术背景,在此基础上分析WDM-PON的劣势为造价成本高,通过对现存关键技术的研究和对比,提出了一种基于相位调制环的多波长产生器,将这种技术应用于WDM-PON中,大大降低了成本。     

一种基于相位调制环的WDM-PON

本文首先简单介绍了WDM-PON的技术背景,在此基础上分析WDM-PON的劣势为造价成本高,通过对现存关键技术的研究和对比,提出了一种基于相位调制环的多波长产生器,将这种技术应用于WDM-PON中,大大降低了成本。     

基于波分复用的无源光网络技术

无源光网络(PON)技术是解决接入网“最后一公里”瓶颈问题最具吸引力的方法之一,特别是近年来光通信技术的发展使得波分复用的无源光网络技术(WDM-PON)的实现在经济和技术上变的可行。首先介绍了一种TDM-PON和WDM-PON共存的系统,并着重阐述了全波分复用的无源光网络(full WDM-PON)技术,对光纤色散、AWG温度稳定性问题以及非线性效应等在WDM-PON建设中需要解决的一些关键技术进行了讨论。     

A WDM-PON Employing Fabry–PÉrot Laser Diodes Without a Seed Light Injection

We propose and demonstrate a wavelength-division-multiplexed passive optical network by employing double-contact Fabry-Perot laser diodes (F-P LDs) without a seed light injection. To avoid the high mode partition noise at low frequency, we use a binary phase-shift keying as a modulation format at a low relative intensity noise window. An error-free transmission is achieved by compensating a lasing envelope shift due to temperature variation with the double-contact F-P LD.     

WDM-PON技术研究和实现方案

首先对时分复用无源光网络(TDM-PON)与波分复用无源光网络(WDM-PON)系统结构和工作原理作对比,得出WDM-PON技术优势,随后介绍了ONU波长固定的WDM-PON系统、ONU宽光源频谱分割WDM-PON系统,然后着重分析了采用再调制技术的两种方案,并对每种方案的优缺点作了简要分析,最后分析了WDM-PON的应用前景.     

1.25-Gb/s Operation of a Spectrum-Sliced Fabry–PÉrot Laser Diode With Intensity Noise Suppression by a Second Fabry–PÉrot Laser Diode

We propose a low-cost solution for the intensity noise suppression in the spectrum-sliced Fabry-Perot laser diode (F-P LD), which is achieved by placing an F-P LD at the receiver region. The F-P LD at the receiver region provides the intensity noise suppression of about 10 dB as well as the increase of the received optical power for the spectrum-sliced optical signal. The Q-factor is improved about 5.9 at a data rate of 1.25 Gb/s. As a result, we successfully demonstrate 10-km error-free transmission at 1.25-Gb/s signal with a transmission penalty of less than 0.5 dB. It is also found that the low spectrum-sliced power of -22 dBm achieves the relative intensity noise level of -112.5 dB/Hz, which is almost independent of the operation current.     

下一代多波长光接入网体系架构的研究

介绍了下一代多波长光接入网的主要技术及其体系架构，主要包括WDM—PON技术、WDM／TDM—PON技术、WDM／OCDMA—PON技术。重点介绍了WDM—PON无色ONU的实现方式，其中采用RSOA实现ONU无色化的体系架构有很大的应用前景。分析了下一代基于广播电视的WDM-PON体系架构的研究现状和发展方向。     

基于RSOA的WDM—PON调制技术研究

简要介绍了WDM-PON的系统结构和工作原理。在0Nu端用RsoA代替光源可以实现ONU的“无色化”。通过仿真实现了DPSK／DPSK调制的WDM-PON系统,能够满足很误码率要求,提高系统性能,为WDM—PON系统的应用提供一种选择。     

WDM-PON下的动态调度算法研究

波分复用无源光网络(WDM-PON)采用虚拟点对点通信,是光网络发展的一种必然趋势.而基于反射式半导体光放大器(RSOA)的再调制WDM-PON系统通过在ONU处用RSOA做调制器替代光源,实现了ONU的“无色化”技术方案,具有巨大的技术优势.以该结构为基础,比较静态顺序和批处理两种调度算法,并进行仿真分析.     

Single fiber colorless symmetric WDM-PON architecture using time interleaved remodulation technique for mitigating Rayleigh backscattering resilience

A time interleaved differential phase shift keying (DPSK) remodulation technique is proposed to mitigate the effect of Rayleigh backscattering (RBS)-induced noise in a single fiber colorless wavelength-division-multiplexing passive optical network (WDM-PON). In order to achieve a cost effective optical network unit (ONU) solution without dedicated laser sources for upstream signals to provide optimum symmetric capacity in a colorless WDM-PON, remodulation becomes the core attraction. Also as the performance of colorless WDM-PON systems suffers from the transmission impairments due to RBS, it is mitigated by using this remodulation scheme. Simulation results show that downstream and upstream signals achieve the error-free performance at 10 Gbit/s with negligible penalty, and enhance the tolerance to RBS-induced noise over a 25 km single-mode fiber.     

浅析WDM-PON及多波长光源的发展趋势

介绍了波分复用无源光网络(WDM-PON)系统的结构原理及其技术优势.分析了WDM-PON系统中的关键器件,即多波长光源的解决方案.讨论了WDM-PON在宽带接入网中的应用前景.