We propose a novel metro-access integrated network that integrates hybrid TDM/WDM optical access networks into MAN, such that the capacity upgrade in both networks can be achieved simultaneously. By interconnecting multiple access ring networks, MARIN provides alternative paths for MAN traffic to be routed on it with high aggregated throughput. Thus it enables the deployed infrastructure, installed hardware, and available bandwidth of the optical access networks to be shared and leveraged by MAN. Cyclic wavelength selective switch, fast tunable laser, and optical parametric wavelength conversion are used in MARIN system for network reconfigurability, resource sharing in the central office, and wavelength set conversion, respectively. The key components are demonstrated with experimental testbed and their performance is evaluated.

A method is proposed to support confidentiality in broadcast fiber-optic LAN/MAN (local/metropolitan area network) systems. This approach, which is different from the conventional approach, is based on a fundamental property of fiber optics, viz., optical bidirectionality. That is, two distinct transmissions in opposite directions can occur simultaneously on the same channel. This property can be used to arrive at network structures to support privacy in a broadcast environment. The basic idea is that when two stations are engaged in a private conversation, they can effectively jam (or blank out) the reception at all other stations. In this sense, security close to that of point to point links is achieved in a broadcast environment. It is shown that this concept can be successfully applied to LAN/MAN systems, specifically, in the context of DQDB, to the proposed IEEE 802.6 MAN standard. Performance issues in terms of throughput are also discussed.>

In this paper we propose a new totally optical approach to the implementation of iterative algorithms for image restoration. A phase conjugating mirror (PCM) is employed as an amplifying element to implement a coherent optical feedback system capable of performing iterative operations on a spatially modulated input beam. Three systems are suggested. Their optical analysis is performed. The obtained results indicate that each system is capable of restoring linearly degraded images.

The author presents the topological design space of single-hop interconnection among multitransceiver stations (no intermediate switches and no forwarding). They explore a class of such interconnections for which the throughput with a uniform traffic pattern is proportional to the square of the number of transceivers per station. These interconnections consist of a collection of buses, each of which interconnects a proper subset of the stations, and are referred to as selective-broadcast interconnections. They are compared with a multiple-broadcast-bus interconnection in terms of station hardware, throughput, delay, and power budget.>

A number of fiber optic configurations for a new class of demand assignment multiple-access local area networks requiring a physical ordering among stations are proposed. In such networks, the data transmission and linear-ordering functions may be distinguished and be provided by separate data and control subnetworks. The configurations proposed for the data subnetwork are based on the linear, star, and tree topologies. To provide the linear-ordering function, the control subnetwork must always have a linear unidirectional bus structure. Due to the reciprocity and excess loss of optical couplers, the number of stations that can be accommodated on a linear fiber optic bus is severely limited. Two techniques are proposed to overcome this limitation. For each of the data and control subnetwork configurations, the maximum number of stations as a function of the power margin, for both reciprocal and nonreciprocal couplers, is computed.