A passive optical network based on centralized wavelength and bandwidth scalable OFDM signals (original) (raw)
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A bandwidth scalable OFDM passive optical network for future access network
Photonic Network Communications, 2009
In order to reduce the cost for delivering the ever increasing broadband services, network providers need to simplify their network architectures and have a better control of the bandwidth. In this article, we propose a simple and cost-effective bandwidth scalable passive optical network (PON) based on orthogonal frequency division multiplexing (BSOFDM-PON). We report performance analysis in terms of the signal-to-noise ratio (SNR), bit-error-rate (BER), and error vector magnitude (EVM) of a PON system accommodating 32 optical network units (ONUs). Our simulations have successfully demonstrated that throughputs of 35.5 and 53.2 Gbps can be achieved using 16 and 64 QAM, respectively, within a total distance ranging from 20 to 30 km. It gives throughputs of 1.10 and 1.66 Gbps per ONU.
Future Generation of Passive Optical Networks
In this paper, a WDM-OFDM-PON architecture based on quadrature-amplitude-modulation (QAM) orthogonal frequency-division-multiplexing (OFDM) for downstream and upstream channels is presented. In our simulation, we theoretically demonstrate the architecture based on centralized-light source using direct detection which is a promising solution for ever increasing demand of bandwidth. For downstream channel, 10-Gbps 16-QAM OFDM signal is successfully transmitted over the distance of 50-km single-mode-fiber.
Performance Evaluation and Optimization of Wavelength Division Multiplexing Passive Optical Networks
In this paper, a central power source architecture is applied to a realize power saving wavelength division multiplexing passive optical network (WDM-PON). Parametric study isevaluated to extend the transmission distance up to 60 and80 km. Optical launched power is optimized through the parametric study. A full duplex 16 optical channels WDM-PON system are experimentally simulated and analyzed. Successful transmission achieved maximum bit error rate (BER) of 10-13 .A return-to-zero differential phase shift keying (RZ-DPSK) modulation technique isutilized for downlink direction, and then the downlink signal is re-modulated for the uplink direction using intensity modulation technique of on-off keying (OOK) with a data rates of 5 and 1 Gbit/s per channel.
2012
Research activities for new alternatives in ultra fast transmission over optical fiber networks are looking towards Orthogonal Frequency Division Multiplexing (OFDM) which is used in different modern communication systems such as LTE, WiFi or WiMax mainly because of the following reasons: tolerance to channel limitations, better spectral exploitation, scalability, flexibility and implementation feasibility with state of the art electronics. These benefits have been subject of major interest in Passive Optical Networks (PONs), which depend on reliable and low cost solutions to be commercialized. The adaptation of OFDM as an access scheme in PONs with cost effective Intensity Modulation with Direct Detection (IM/DD) can potentially deliver these benefits and be a next step in the evolution of high volume data access networks. The flexibility given by OFDM is applied as bandwidth granularity for the users in such a way that each of them will be guaranteed a certain level of service, yet the reconfigurability capabilities and bandwidth assignment for different users in a Optical Orthogonal Frequency Division Multiplexed Access (O-OFDMA) PON must be properly understood. This work reports the development of an experimental setup on IM/DD O-OFDMA for next generation PONs, in particular studying bandwidth assignment for different users for future Dynamic Bandwidth Allocation strategies.
An Experimental Assessment of the BSOFDM-PON Architecture
In this paper, we present experimental investigations of a 6 Gbps passive optical networks (PON) based on bandwidth scalable orthogonal frequency division multiplexing (BSOFDMPON). The BSOFDM-PON architecture is composed by an optical line terminal (OLT) and three optical network units (ONUs) located at distances ranging from 25 to 65 km of standard singlemode fibers (SSMF). The influence of the frequency guard band designed to accommodate intermodulation distortions (IMD) inherit of direct-detection optical OFDM (DDO-OFDM) systems is experimentally evaluated. Our results show that this guard band strongly depends on the received optical power (fiber length) and the subcarrier modulation format. An error free transmission in 65 km of SSMF for a scalable bandwidth of 3 GHz occupying 4096 subcarriers mapped in 4QAM is achieved without the frequency gap of the guard band.
Gigabit Access Passive Optical Network Using Wavelength Division Multiplexing—GigaWaM
Journal of Lightwave Technology, 2014
This paper summarizes the research and technical achievements done under the EU project GigaWaM. The goal of this project was to develop a cost-effective solution that can meet the increasing bandwidth demands in access networks. The approach was to use a novel wavelength division multiplexing passive optical network (WDM-PON) architecture that can deliver symmetric 1 Gb/s to 64 users over 20 km standard single mode fiber using the L and C bands for down and upstream, respectively. During the course of the project, a number of key enabling technologies were developed including tunable transceivers, athermal 50 GHz spaced arrayed waveguide grating multiplexer devices, novel hybridization technologies for integration of passive and active electro-optic devices, and system-level algorithms that ensure the quality of service. The outcome of the project proved a reliable, cost-effective, flexible, and upgradable WDM-PON solution, achieving per-user datarates of 2.5 and 10 Gb/s for up and downstream, respectively. The proposed solution is not only suitable for access networks, but also for metro aggregation and mobile backhaul.
Emerging Optical Broadband Access Networks from TDM PON to OFDM PON
The bandwidth requirements of the telecommunication network users increased rapidly during the last decades. The emerging optical access technologies must provide the bandwidth demand for each user. The passive optical access networks (PONs) support a maximum data rate of 100 Gbps by using the orthogonal frequency division multiplexing (OFDM) technique in the optical access network. In this paper, the enabling optical broadband access networks with many techniques are presented and compared. The architectures, advantages, disadvantages, and main parameters of these access networks are discussed and reported. A combination of different techniques in a hybrid PON network introduces a cost-effective, reliable and efficient access network. The hybrid optical broadband access technologies are presented which have many advantages to become next-generation broadband access networks. The concept and architecture of the hybrid optical broadband access networks are discussed.
Technologies for Future Wavelength Division Multiplexing Passive Optical Networks
IET Optoelectronics, 2020
This paper reviews key technologies of next generation wavelength division multiplexing passive optical networks (WDM-PONs). We have studied WDM-PONs with centralized lightwave source and direct detection, where a wavelength-reuse system is employed to transmit the uplink data by using a colourless transmitter at the optical network unit (ONU). WDM-PON system was demonstrated using a Fabry-Perot laser diode (FP-LD) as a colourless transmitter at the ONU, for Differential phase-shift keying (DPSK) downlink signals and On-off keying (OOK) uplink signals respectively. The constant-amplitude feature of the DPSK modulation could retain great extinction ratio of downlink signal and decrease the noise to the uplink signal. The proposed scheme offers a promising solution for future PONs.