Centralized light-wave WDM-PON employing DQPSK downstream and OOK remodulated upstream signals

A novel architecture for wavelength-division-multiplexing passive optical network(WDM-PON)with centralized light-wave is proposed and demonstrated.At the optical line terminal(OLT)session of this architecture,optical differential quadrature phase shift keying(DQPSK)modulated signal with constant-intensity at 10 Gbit/s is utilized for downstream transmission.At the optical network unit(ONU),part of the downstream optical power is remodulated with on-off keying(OOK)intensity modulation at 10 Gbit/s for upstream without additional laser.Simulation results show that the power penalties of the downstream for 20 km single-mode fiber(SMF)transmission and multi-channels are negligible.While for the upstream,the power penalties are obvious.The simulation results and analysis also reflect that by reducing the launch power of DQPSK transmitters,power penalties can be reduced,although the transmission distance is limited.     

Re-modulated technology of WDM-PON employing different DQPSK downstream signals

This paper proposes a kind of modulation architecture for wavelength-division-multiplexing passive optical network(WDM-PON)employing optical differential quadrature phase shift keying(DQPSK)downstream signals and two different modu-lation formats of re-modulated upstream signals.At the optical line terminal(OLT),10 Gbit/s signal is modulated with DQPSK.At the optical network unit(ONU),part of the downstream signal is re-modulated with on-off keying(OOK)or inverse-return-to-zero(IRZ).Simulation results show the impact on the system employing NRZ,RZ and carrier-suppressed return-to-zero(CSRZ).The analyses also reflect that the architecture can restrain chromatic dispersion and channel crosstalk,which makes it the best architecture of access network in the future.     

调制格式对再调制WDM-PON系统性能的影响

比较和分析了使用1.25Gb/s,2.5Gb/s and 5Gb/s的曼彻斯特编码和NRZ编码下行信号,1.25Gb/s NRZ编码上行信号的基于反射式半导体光放大器(RSOA)的波长重用波分复用无源光网络(WDM-PON)系统的性能.实验结果表明,相对于NRZ调制格式,曼彻斯特编码可获得更好的功率余量,尤其是在上下行信号速率非对称的网络中,曼彻斯特编码具有更加明显的优越性.     

An AWG based colorless WDM-PON with RZ-DPSK modulated downstream and re-modulation of DL signal for OOK upstream

We proposed an arrayed waveguide granting (AWG) based 10 Gbps full duplex wavelength division multiplexing passive optical network (WDM-PON) utilizing a retum-to-zero differential phase shift keying (R...     

一种基于正交调制的WDM-PON和RoF混合接入网

提出了一种基于正交调制的WDM-PON和RoF混合接入网方案.在该方案中,射频信号和单播数据被正交调制到光载波上.在接收端采用不同的解调方案,分别得到单播数据和射频信号.该方案实现了有线和无线宽带业务的融合.实验显示了该方案在低射频载波频率下能得到较好的误码率.     

EPON和WDM-PON的分析比较

文章分析了以太网无源光网络(EPON)和波分复用无源光网络(WDM-PON)的多址技术、物理层关键技术和二层协议,特别针对这两种技术点对点仿真(P2PE)的实现给出了详细的分析,比较了这两种技术的性能,最后给出了结论并指出了二者不同的应用方向.     

单个MZI型DQPSK解调器的设计与仿真

文章采用91 μm厚的石英半波片来降低器件的PDFS(偏振相关频率漂移),在放置半波片位置采用优化的楔形波导结构,将插入半波片带来的附加损耗降至0.41 dB.并通过广角三维光束传输法,对DQPSK(差分正交相移键控)解调器在C波段进行了仿真.结果表明:采用这种结构设计出的器件具有低插损值和高消光比.     

A WDM-PON with DPSK modulated downstream and OOK modulated upstream signals based on symmetric 10 Gbit/s wavelength reused bidirectional reflective SOA

We investigate a wavelength-division-multiplexing passive optical network (WDM-PON) with centralized lightwave and direct detection. The system is demonstrated for symmetric 10 Gbit/s differential phase-shift keying (DPSK) downstream signals and on-off keying (OOK) upstream signals, respectively. A wavelength reused scheme is employed to carry the upstream data by using a reflective semiconductor optical amplifier (RSOA) as an intensity modulator at the optical network unit (ONU). The constant-intensity property of the DPSK modulation format can keep high extinction ratio (ER) of downstream signal and reduce the crosstalk to the upstream signal. The bit error rate (BER) performance of our scheme shows that the proposed 10 Gbit/s symmetric WDM-PON can achieve error free transmission over 25-km-long fiber transmission with low power penalty.     

基于差分相位再调制与时延干涉检测的WDM-PON辅助管理和控制通道实现方法

波分复用无源光网络（wavelength-division multiplexed passive optical network,WDM-PON）中,操作管理和维护数据路径与用户数据路径在传输汇聚层是彼此独立的。操作管理和维护数据可以通过透传和码传两种方式进行发送。其中,透传方式由于无需额外的转码器件以及具有低时延等特性被广泛应用于各种行业网络。不同于现有的透传模式,即基带再调制和射频通道,提出了一种新型的基于差分相位再调制与时延干涉检测的辅助管理和控制通道实现方法。所提方法的辅助管理和控制信号以相位参数再调制于用户信号之上,而用户信号采用传统强度调制,因此辅助管理和控制信号的再调制过程将不会对用户信号质量产生影响。相对地,基带再调制和射频通道都会对用户信号造成扰动,这在抖动要求较高的行业网内是不允许的。所提方法被认为是波分复用无源光网络中一种有效的辅助管理和控制通道的实现方法。     

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.     

A new scheme for bidirectional WDM-PON using upstream and downstream channels generated by optical carrier suppression and separation technique

We propose a new bidirectional dense wavelength-division-multiplexing (DWDM)-based passive optical network using optical carrier suppression and separation technique to generate both upstream and downstream wavelength channels from a single laser. Thirty-two DWDM channels have been generated, and symmetric 10-Gb/s data transmission of a wavelength pair has been demonstrated.     

一种集成无线和有线信号的混合接入系统研究

为了满足不同高带宽业务的需求,提出一种同时传输有线和无线信号的混合接入网系统。在下行链路中,无线信号以相位调制格式在光载波上传输,有线信号以强度调制格式重调制在光载波上,在ONU(光网络单元)采用不同的解调方案进行解调接收;在上行链路中,通过载波重用技术再调制有线基带信号并将其传输至OLT(光线路终端),简化了系统的器件配置。利用光学软件Optisystem验证了系统的可靠性和有效性。仿真结果显示,无线链路信号和有线基带信号经过正交调制传输后,在用户端仍能得到较好效果的眼图,说明它们能被准确地接收。采用载波重用技术的上行基带信号也能被OLT准确地接收。