Hybrid TDM/WDM PON is a promising optical access network solution which taking advantages of both TDM-PON and WDM-PON, and suitable for near future deployment in pragmatic migration from current TDM-PONs to future WDM-PONs. In this paper, we review and compare five types of the representative hybrid TDM/WDM PON architectures: TDMA based hybrid PON, WDMA based hybrid PON, TDM over WDM hybrid PON, WDM over TDM hybrid PON, and SUCCESS hybrid PON. Several key issues and enabling technologies for deploying hybrid TDM/WDM PON, including wavelength assignment, media access control and wavelength management protocols, light sources, and protection, are also discussed in the paper.
With the development of Internet application, user needs more and more bandwidth. 10G EPON is a good choice for
next generation access-network. The architecture of the WDM-based 10G EPON is proposed in this paper and we also
provide the configuration of the upstream. WDM-based 10G EPON operate in different speed on different direction, and
the logical link is point to point communication in the upstream while behaving as multipoint to point in physical topology. We put forward the protocol stack of this architecture. We proposed a sub-layer named MWMC (Multi-Wavelengths MAC Control). The MWMC sub-layer need not deal with Timing, Ranging, Report or Gating processing.
But LLID (Logical Link Identifier) is also needed to implement the P2PE (Point to Point Emulation) in the downstream.
We detailed dissertate how to implement the P2PE in this architecture using the concept of LLID. The WDM-based 10G
EPON is easy to implement and need not high speed burst mode transceivers, and its cost is not very high. The WDM-based
10G EPON has better performance than the TDMA-based 10G EPON for its low delay and high upload bandwidth
with no collision between different ONUs in the upstream.
Wavelength Division Multiplex Ethernet Passive Optical Network (WDM EPON), due to its simple configuration and enormous capacity advantage over present access network technology, is considered by many experts to be the promising solution to realize FTTH. In this paper, we proposed a model of WDM EPON system using OPNET, collected the statistical parameters and analyzed the network capacity through simulation. Based on the network topology and WDM technology features, we designed the network configuration to be P2MP in the downstream direction using broadcasting mechanism and P2P in the upstream direction using independent wavelength channels. We studied the MAC protocol stacks under WDM EPON hierarchy and designed the OLT and ONU node modules based on the theoretical models. ONU dynamic registration and MAC mappings of data switching in OLT are the two key technologies introduced in the model to realize the communication within the system. Simulation results approve that WDM EPON system has great bandwidth capacity and extremely little terminal-to-terminal latency, thus displaying great capability advantages and developing prospects.
A Fairness Guaranteed Scheme is introduced for the Dynamic Bandwidth Allocation (DBA) in an Ethernet Passive Optical
Network (EPON). The scheme is simple and of low computational complexity, it can guarantee both the efficiency and
fairness of the DBA. Especially, it can be used in both inter-ONU scheduling and intra-ONU scheduling. Simulation results
using synthetic traffic confirm its good performance against existing bandwidth allocation scheme.
With the development of all-optic network, the hotspot of the research is moving from the backbone network to the metropolitan network, and then to the access network. Much attention has been paid on reducing the cost in these networks. One approach is to adopt Ethernet passive optical network (EPON) architectures in an access network. In this paper a solution of EPON of Broadcasting/WDMA architecture is presented, which is based on several low-cost DWDM devices developed newly by authors, including the precise-wavelength DWDM-LD, DWDM demultipler with interleaver, DWDM receiver array, and dual-window broad-band coupler.
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