In this paper, a three-dimensional grid architecture supporting discretionary direct communication among optical network units (ONUs) is proposed. By setting up one $N \times N\hspace{3pt}$N×N arrayed waveguide grating (AWG) and two coarse wavelength division multiplexers in the remote node (RN), optimal path selection of ONUs can be carried out. At same time, construction RN simple. combining with three-band allocation, downstream upstream signals as well direct-communication simultaneously...

ABSTRACT In this paper, an extensible optical access network architecture is proposed on the basis of multiple tangent single‐fiber rings. With architecture, both multistage protections and data aggregation can be realized. Optical line terminal remote nodes (RNs) automatically switch to protection mode overcome fiber failure occurring in main ring (MR) sub‐rings (SRs). The RNs, which are designed as points, realize wavelengths adding dropping between MR SRs, they also expansion conveniently...

This paper investigates the feedback period of channel state information (CSI) considering random blockage for an indoor visible light communication (VLC) network. First, a random-blockage model (RBM) VLC network was built. Through RBM, closed expression dynamic and self-blockage probability were obtained. Based on statistical method coherence distance (CDM) under established. CDM, weighted gain user equipment at any position can be obtained specific distribution density blockers. adaptive...

A passive optical network (PON) with multiple line terminals (OLTs) will play an important role in the access network. In this study, a novel dynamic bandwidth allocation (DBA) algorithm for downstream channel multi‐OLT PON is proposed. To take care of demands different users, weight factors are introduced. Based on factors, core framework constructed. Moreover, by combining decision criterion and surplus ratio, mathematical model release established. Furthermore, uniting judgement...

In this paper, a reliable Wavelength-Division-Multiplexing Passive Optical Network (WDM-PON) system is proposed. It can provide the protection against both feeder fiber failure and distribution failure. When occurs, corresponding switches in OLT ONU switch to link without affecting users normal status. That say, for one independent of other ONUs.

Summary Direct communication between optical network units (ONUs) provides the opportunity to reduce substantial latency among two communicating ONUs, which is very significant for next generation networks. In this paper, an expandable intersection‐ring architecture support direct ONUs proposed. By adopting tunable fiber Bragg gratings (FBGs), peer‐to‐peer of can be achieved. utilizing cyclic routing property arrayed waveguide grating (AWG), upstream/downstream together with carried out...

In this paper, the blockage problem of optical link between AGV (autonomous ground vehicles) and AP (access point) in logistics–warehousing VLC (visible light communication) network is analyzed. First, based on random geometric model, a link-blockage model proposed. Given position AGV, obstacle, state can be obtained through model. Then, an AP-placement scheme Under placement, AGVs any have reliable that not affected by obstacles. During movement will interrupted blockage. Finally,...

Summary We propose a wavelength‐reuse wavelength‐division multiplexing semipassive optical access network architecture with ring topology. Two rings are controlled by one central office. The system capacity, as well the cover area, can be doubled this proposal. When fiber failure occurs, corresponding switches in remote nodes change to protection state restore communication. Copyright © 2014 John Wiley & Sons, Ltd.

ABSTRACT A highly reliable multi‐wavelength optical access network architecture based on single‐fiber and tangent rings is proposed. With the proposed architecture, both data convergence protection can be realized. The primary ring provide for remote nodes (RNs) connected with its feeder fibers. design of RN used as point realize wavelength adding dropping between two it also realizes expansion network. RNs in sub‐ring realized by controlling corresponding switches. Copyright © 2012 John...

We proposed a novel architecture of WDM-PON based on the wavelength-lock light source. The wavelength utilizing rate was doubled by using an remote node (RN). ORL induced ASE eliminated.

In this paper, a novel WDM-PON structure based on dual-fiber ring of RNs and star topology ONUs is designed to realize the full protection for services in case either single or dual fiber failure. design, survivability network largely enhanced by three work methods. Simultaneously, can reduce crosstalk caused same wavelengths fiber, improve performance transmission system.

In this paper, we propose and demonstrate a novel survivable WDM-PON architecture using Optical Carrier Suppression (OCS) technique. It can provide protection against the feeder fiber failure. The simulation results for scheme at 2.5 Gbit/s downstream signals upstream are presented to verify feasibility of system.

We present a novel method for providing broadcast signal transmission in wavelength division multiplexing passive optical network (WDM-PON).An unmodulated carrier downstream and pair of single-side band subcarriers are utilized delivery upstream transmission, respectively.System performance at 2.5-Gb/s down/upstream is also investigated.

Abstract A wavelength-utilized rate-doubled wavelength division multiplexing passive optical network based on a self-seeding light source is proposed. The effect of distributed fiber length and power ratio the upstream-signal analyzed; result indicates that raising can increase when it lower than 0.86. difference between upstream signals caused by fibers also expanded with ratio; thus, should be decreased to proper level reduce too large.