The papers in this special section focus on multi-band optical networks. introduce the key challenges, trends, and innovations. Current deployed networks are reaching saturation of their capacity with continuous bandwidth demand increase. However, installation new infrastructures or fibers requires high investments from network operators. Thus, alternative solutions to cope enormous needed. Cur...

Reconfigurable optical networks have emerged as a promising technology to efficiently serve the fast-growing traffic produced by digital society. This paper provides survey of field. We first review enabling hardware technologies in general and then consider that are specific data center wide-area more detail. further provide an overview cost models used literature well algorithmic problems int...

Due to limited available photonic devices, optical networks in the near future will likely employ routing schemes that do not require sophisticated processing of optical packets. In this paper, we propose a novel self-routing scheme for all-optical packet networks that can be applied to networks with arbitrary topology. The proposed routing scheme requires only single bit processing and can be ...

In this paper Wavelength Switching (WS), Optical Burst Switching (OBS) and Optical Packet Switching (OPS) network models are compared. The next future is for WS networks but there is a big investigation effort for development of both OBS and OPS networks, which seem to be further successors in the optical networks world. At the beginning, a brief distinction between considered switching paradig...

The IST-LASAGNE project [1], investigates all-optical label swapping employing optical logic gates in network nodes: in other words, the intention is not only to switch the payload of a burst or packet optically, but also to process the accompanying header in the optical domain. All-optical packet-switching forms in that way the logical evolution of optical packet-switched (OPS) networks. It ov...

Dense wavelength division multiplexing (DWDM) opaque networks use expensive optical/electrical/optical (O/E/O) conversion at each end of a fiber link. Several technological advances have been used in an attempt to reduce the O/E/O conversion cost component: improved optical amplifiers using distributed Raman amplification allow signals to traverse longer distances without amplification and/or r...

Network resilience is an issue of deep concern to network operators being eager to deploy high-capacity fibre networks, since a single failure in the network could result in significant losses of revenue. The importance of network reliability will keep pace with the steadily increasing network capacity. For very-high-capacity future optical networks, carrying multitudes of 10 Gbit/s channels pe...

The optical CDMA and WDM systems have been of widespread implementation for local and metro access network. This is because optical CDMA systems provide users both simultaneous and asynchronous access to networks with high security [1], and WDM systems provide a relatively high transmission capacity [2]. In addition, optical CDMA can be overlaid onto existing WDM networks in order to enhance th...

Pure all-optical packet-switched networks in which both header processing and packet routing are carried out in the optical domain overcome the bandwidth bottlenecks of optoelectronic conversions and therefore are expected to meet the needs of next generation high speed networks. Due to the limited capabilities of available optical logic devices, realizations of pure all-optical packet-switched...