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首页> 外文期刊>Optical fiber technology >Four-fold increase in users of time-wavelength division multiplexing (TWDM) passive optical network (PON) by delayed optical amplitude modulation (AM) upstream
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Four-fold increase in users of time-wavelength division multiplexing (TWDM) passive optical network (PON) by delayed optical amplitude modulation (AM) upstream

机译：通过上行延迟光幅度调制（AM），时波分复用（TWDM）无源光网络（PON）用户的数量增加了四倍

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In this paper, we have proposed and simulated optical time division multiplexed passive optical network (TDM-PON) using delayed optical amplitude modulation (AM). Eight upstream wavelengths are demonstrated to show optical time wavelength division multiplexed (TWDM) by combining optical network units (ONU) users data at the remote node (RN). Each ONU generates 2.5 Gb/s user data, and it is modulated using novel return to zero (RZ) delayed AM. Optical TDM aggregates 10 Gb/s data per wavelength from four 2.5 Gb/s upstream user data, which facilitates four different ONU data on the same wavelength as 10 Gb/s per upstream wavelength and, simplify the laser requirements (2.5 Gb/s) at each optical network unit (ONU) transmitter. Upstream optical TWDM-PON is investigated for eight wavelengths with wavelength spacing of 100 GHz. Novel optical TDM for upstream increased the number of the simultaneous user to fourfold from conventional TWDM-PON using delayed AM with a high-quality-factor of received signal. Despite performance degradation due to different fiber reach and dispersion compensation technique, Optical TWDM link shows significant improvement regarding receiver sensitivity when compared with common TWDM link. Hence, it offers optimistic thinking to show optical TDM at this phase as one of the future direction, where complex digital signal processing (DSP) and coherent optical communication are frequently demonstrated to serve the access network. Downstream side conventional TWDM eight wavelengths are multiplexed at the OLT and sent downstream to serve distributed tunable ONU receivers through an optical distribution network (ODN). Each downstream wavelengths are modulated at the peak rate of 10 Gb/s using non-return to zero external modulation (NRZ-EM). The proposed architecture is cost efficient and supports high data rates as well as `` pay as you grow" network for both service providers and the users perspectives. Users are classified into two categories viz home-user and business-user, with an option for easy up-gradation. Proposed architecture operates on next generation passive optical network stage 2 (NG-PON2) wavelength plan, with symmetrical data rate. Downstream performance is investigated by comparing, high power laser source with a conventional laser source and the L-band Erbium-doped fiber amplifier (EDFA) of gain 10 dB and 20 dB. Downstream eight wavelengths perform error-free up to 40 Km fiber reach and 1024 splitting points. Power budget of the proposed architecture incorporates the N1, N2, E1 and E2 optical path loss class. (C) 2016 Elsevier Inc. All rights reserved.
机译：在本文中，我们提出并使用延迟光幅度调制（AM）来模拟光时分复用无源光网络（TDM-PON）。通过在远程节点（RN）上组合光网络单元（ONU）用户数据，展示了八个上游波长来显示光时波分复用（TWDM）。每个ONU生成2.5 Gb / s的用户数据，并使用新颖的归零（RZ）延迟AM对其进行调制。光学TDM会从四个2.5 Gb / s上行用户数据中每个波长聚合10 Gb / s数据，这有助于在与每个上行波长10 Gb / s相同的波长上输出四个不同的ONU数据，并简化了激光要求（2.5 Gb / s）在每个光网络单元（ONU）发射机处。研究了上行光TWDM-PON的八个波长，波长间隔为100 GHz。用于上游的新型光TDM将同时使用的用户数量从传统的TWDM-PON（使用延迟AM和接收信号的高品质因数）提高到原来的四倍。尽管由于不同的光纤到达距离和色散补偿技术而导致性能下降，但与普通TWDM链路相比，光纤TWDM链路在接收器灵敏度方面显示出显着改善。因此，它提供了乐观的想法，将光TDM展示为这一未来的方向之一，在该方向上，经常证明复杂的数字信号处理（DSP）和相干光通信可以为接入网服务。下游侧的传统TWDM八个波长在OLT处复用，并通过光分配网络（ODN）向下游发送，以服务于分布式可调谐ONU接收器。使用不归零外部调制（NRZ-EM），以10 Gb / s的峰值速率调制每个下游波长。所提议的体系结构具有成本效益，并为服务提供商和用户提供了高数据速率以及“按需购买”的网络，用户分为家庭用户和企业用户两大类，易于升级：建议的架构在下一代无源光网络第二阶段（NG-PON2）波长计划上运行，数据速率对称，通过将高功率激光源与常规激光源和L波段进行比较，研究了下行性能掺10光纤放大器（EDFA）的增益分别为10 dB和20 dB。下行8个波长可在40 Km的光纤范围和1024个分离点上实现无差错。该架构的功率预算包括N1，N2，E1和E2光（C）2016 Elsevier Inc.保留所有权利。

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