Division Multiplexing Passive Research Articles

MIMO Pre‑Equalization Based Mode Crosstalk Mitigation Method in Mode Division Multiplexing Passive Optical Network

MIMO Pre‑Equalization Based Mode Crosstalk Mitigation Method in Mode Division Multiplexing Passive Optical Network

METAhaul framework of HPON for smart city access networks

ABSTRACTThis work presents, a novel, Mobile Evaluation Transport Architecture haul (METAhaul) of Hybrid PON (HPON), that integrates mobile backhaul (MBH), mobile fronthaul (MFH) and smart devices in one platform. It forms a unified analytical framework, that comprehensively accounts for both fiber/copper (FiCo) and METAhaul broadband access networking technologies, to accommodate the fifth generation (5G) Radio Access Network (RAN) evolution and smart sensor devices. Our framework is flexibly designed to roll out while adopting 5G into the smart city. HPON allows the coexistence of the Time Division Multiplexing Passive Optical Network (TDM-PON), Wavelength Division Multiplexing Passive Optical Network (WDM-PON), hybrid Time-Wavelength Division Multiplexing Passive Optical Network (TWDM-PON), multi-gigabit fast access to subscriber terminals (G.mgfast), and Radio over Fiber (RoF) architecture. It can reduce the power consumption by 78.13%, 79.62% at Sub-6GHz, and 77.7%, 79.21% at mmWave against Optical Transport Network (OTN) and Carrier Ethernet (CE), respectively. Specifically, HPON grants a higher Energy Efficiency Rating (EER) of 65.58%, 67.34% when compared to OTN, and CE each while deploying 15 Radio Units (RU). The proposed next-generation PON architecture can benefit the design and operation of smart city access networks, with its large capacity, multilevel of service, and energy saving.

Adaptive dynamic wavelength and bandwidth allocation algorithm based on error-back-propagation neural network prediction

With the emergence of new services such as high-definition video, cloud computing and virtual reality, Wavelength Division Multiplexing/Time Division Multiplexing-Passive Optical Network (WDM/TDM-PON) has become a key technology for future access network. The development of Software Defined Networking (SDN) and machine learning also brings new opportunities to the flexibility of WDM/TDM-PON. In this paper, an Adaptive Dynamic Bandwidth Allocation algorithm based on error-back-propagation Neural Network Prediction (ADBA-NNP) was proposed to reduce the Round-trip-time (RTT) delay in the bandwidth-scheduling period. A Dynamic Wavelength Allocation (DWA) algorithm and a novel architecture of WDM/TDM-PON was proposed to simple the multi-carrier source. The experimental results validated that the proposed algorithm could dynamically allocate wavelengths under multi-carrier at 12.5G intervals. Compared with the traditional algorithms, the proposed algorithm could reduce the transmission delay by 25%.

20-Gb/s Transmission Over 25-km in Wavelength Division Multiplexing Passive Optical Network with Centralized Light Source

20-Gb/s Transmission Over 25-km in Wavelength Division Multiplexing Passive Optical Network with Centralized Light Source

A Symmetric RZ-DPSK Based Colorless NG-PON using Optical Carrier Suppression Scheme

In this paper a simultaneous transmission of a 10 Gbps RZ-DPSK data signal for downstream as well as for upstream is proposed and successfully simulated. An OCS (Optical Carrier Suppression) scheme for generation of second order dual side-band optical carrier is utilized by quadrupling a 10 GHz clockfrequency with a 10 GHz LN-MZM (Lithium-Niobate Mach-Zehnder-Modulator). The upper side second order band is used to generate a RZ-DPSK (Return to Zero-Differential Phase Shift Keying) data signal at the OLT (Optical Line Terminal). At the receiving ONU (Optical Network Unit) 50 km away from the OLT the unmodulated lower side second order band coupled with the downlink transmitted signal is utilized for the uplink modulation of 10 Gbps data in RZ-DPSK format. The simulation results show that the performance of the single-tone RZ-DPSK data modulation format is a suitable choice for the WDMPON (Wavelength Division Multiplexing-Passive Optical Network) link with a transmission span of 50 km. The proposed architecture eliminates the need of any pulse carver and mid-span power amplifiers along with the requirement of any power splitting device used in the ONU for colorless uplink transmission. In this scheme, high data rate transmission over long distance is achieved. This scheme merges the boundaries of local access networks and MAN (Metropolitan Area Networks). The proposed scheme is a highly robust, cost effective, backward compatible as well as future proof WDM-PON architecture.

A New Wavelength Optimization and Energy-Saving Scheme Based on Network Coding in Software-Defined WDM-PON Networks

AbstractIn view of the characteristics of the global control and flexible monitor of software-defined networks (SDN), we proposes a new optical access network architecture dedicated to Wavelength Division Multiplexing-Passive Optical Network (WDM-PON) systems based on SDN. The network coding (NC) technology is also applied into this architecture to enhance the utilization of wavelength resource and reduce the costs of light source. Simulation results show that this scheme can optimize the throughput of the WDM-PON network, greatly reduce the system time delay and energy consumption.

SCM/WDM-PON with in-service baseband embedded OTDR monitoring

Subcarrier Multiplexing and Wavelength Division Multiplexing Passive Optical Network (SCM/WDM-PON) is a promising solution to support Radio over Fiber (RoF) for the convergence of optical and wireless access networks. In this paper, we propose a novel SCM/WDM-PON system with in-service baseband monitoring, which uses an optical carrier to supervise the fiber infrastructure and several subcarriers to transmit data signals simultaneously. The performance of the proposed system is investigated where an embedded baseband Optical Time Domain Reflectometry (OTDR) signal is applied for fiber fault monitoring. The results have verified the feasibility of the proposed system and shown that with proper configuration the in-service baseband monitoring signals have negligible impact on data transmission.

10 Gbit/s Bidirectional Long Reach WDM-PON using Externally Modulated Laser for Downlink and RSOA for Uplink with Dispersion Compensating FBG

This paper presents Long Reach Wavelength Division Multiplexing Passive Optical Network (WDMPON) system capable of delivering downstream 10 Gbit/s data and upstream 10 Gbit/s data on a single wavelength. The optical source for downstream data and upstream data is CW laser at central office and reflective semiconductor optical amplifier (RSOA) at each optical network unit. The use of dispersion management for both up and downstream transmission removes the error floor owing to the chromatic dispersion induced excess intensity noise. It has also been experimentally confirmed that both pre and post-dispersion compensating schemes are effective ways to suppress the intensity noise. Error free bidirectional transmission over 35 km is demonstrated by using Erbium-doped fiber amplifiers at the RN and at central office. Optical power budgets 14.565 dB and 29.171 dB are achieved for downstream performance and upstream performance respectively. This paper demonstrates an effective mitigation of Rayleigh backscattered noise for upstream data and downstream data and also demonstrates that receiver sensitivity is improved for upstream and downstream data. Bit error rate were measured to demonstrate the proposed scheme. In this paper long reach and large data service aspects of a WDM-PON is presented.

Implementing Long Reach WDM-PON Delivering Downstream Data 2 Gbps and Upstream Data 70 Gbps on a Single Wavelength using Soliton Pulse

ABSTRACTThis article presents Long Reach Wavelength Division Multiplexing Passive Optical Network (WDM‐PON) system capable of delivering downstream 2 Gbit/s data and upstream 70 Gbit/s data on a single wavelength using pulse source which is mode locked laser that generates a single pulse of “sech” shape with specified power and width. That is, soliton pulse. The optical source for downstream data and upstream data is sech pulse generator at central office (CO) and reflective semiconductor optical amplifier (RSOA) at each optical network unit (ONU). We use two RSOAs at each ONU for the 70‐Gb/s upstream transmission. The operating wavelengths of these RSOAs are separated by the free‐spectral range of the cyclic arrayed waveguide gratings used at the CO and remote node (RN) for (de)multiplexing the WDM channels. We extend the maximum reach of this WDM PON to be 123 km by using Erbium‐doped fiber amplifiers at the RN. The results show that the error‐free transmission can be achieved for all WDM channels in the wavelength range of >35 nm with sufficient power margins. We also investigate analysis of backscattered optical signal for upstream data and downstream data simultaneously. Bit error rate, were measured to demonstrate the proposed scheme. In this article, Long reach and large data service aspects of a WDM‐PON is presented. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2853–2859, 2013

Simulation and Comparison of Advanced Modulation Formats for Wavelength Reuse in High-SpeedWDM-PON System

In recent years, the innovation in devices and schemes of physical layer plays an important role in promoting the development of WDM-PON (Wavelength Division MultiplexingPassive Optical Network).Among the key technologies adopted in the WDM-PON system, advanced modulation formats at downstream and remodulations at upstream attract the most attention. DPSK (Differential Phase Shift Keying Modulation), FSK(Frequency-Shift Keying), IRZ(Inverted Return-to-Zero) and Manchester are four of the most common formats and each of them was studied before, but, however, nobody compared and analyzed them together.So, we will do the job by numeralsimulation in this paper. During our simulation, the 40-Gbit/s FSK is generated through the demodulation of two DPSK signals and 40-Gbit/s Manchester signal bases of employing a delay interferometer (DI) and an optical delay line as format conversion device to convert RZ-DPSK(Return to Zero-Differential Phase Shift Keying Modulation) coding to Manchester coding, both of the two format generation schemes are novel.Meanwhile,this paper emphasizes the input optical power and dispersion tolerance, which both related to the sensitivity of the system. Analyze the sensitivity with DPSK, FSK, IRZ and Manchester, and then compare the four advanced modulation formats.