Mode-division-multiplexing (MDM) and wavelength-division-multiplexing (WDM) are employed simultaneously in a multimode silicon waveguide to realize on-chip MDM and MDM-WDM transmission. Asymmetric Y-junction MDM multiplexers and demultiplexers are utilized for low coherently suppressed demultiplexed crosstalk at the receiver. We demonstrate aggregate bandwidths of 20 Gb/s and 60 Gb/s for MDM an...

All-optical networks that employ wavelength division multiplexing (WDM) are an attractive architecture for future high-speed networks. Through WDM, multiple channels are created on a single fiber, and an aggregate network bandwidth far greater than the peak electronic processing speed can be realized. This paper provides a review and an extensive bibliography of proposed media access control (M...

Mode-division multiplexing (MDM) using few-mode fibre (FMF) has received increasing attention to address the exponential growth of data traffic in long-haul optical communication systems. Also, combining MDM with wavelength-division (WDM) is a promising approach for dramatically growing transmission capacity such However, major barrier this regard FMF nonlinear effects, which can significantly ...

We investigate the effects of warm dark matter (WDM) on the cosmic 21-cm signal. If dark matter exists as WDM instead of cold dark matter (CDM), its non-negligible velocities can inhibit the formation of low-mass haloes that normally form first in CDM models, therefore delaying star formation. The absence of early sources delays the build-up of UV and X-ray backgrounds that affect the 21-cm rad...

The WDM network is an optical network to employ the wavelength division multiplex WDM technology. This technology provides transmission of data on different optical wavelengths through the same optical fiber. We will concentrate on WDM network only, where each wavelength corresponds to a data communication channel. Moreover, we deal with all-optical networks. In these networks, the optical sign...

The perfomnce of a symmetric Robust WDM network that uses token-passing on the signaling channel and has a limited number of lasers per station is modeled and analyzed for circuit-switched connections. Robust WDM networks use a reservation interval during which all stations cease their WDM transmissions so that the station holding the token may establish a connection with its intended destinati...

Abstract. We propose a framework to analyze and compare wavelength division multiplexed (WDM) switching networks qualitatively and quantitatively. The framework not only help analyze and compare the complexity of WDM switching networks, but also explain interesting properties of different designs. Then, several important problems arising from this idea are addressed, and complexity bounds are d...

In this paper, we study the effect of the round trip propagation delay on performance measures of WDM networks and adopt a dynamic policy and a synchronous transmission procedure to access data channels. Also we propose a new control architecture for WDM star-coupled networks, to overcome the electronic processing bottleneck that the single control channel architecture introduces. Key-Words: Wa...

In this article, we first discuss QoS metrics of the data networks, followed by raising the challenging problems for the nextgeneration Internet with high-performance and high-quality. We then discuss how the WDM technology can be incorporated for resolving those problems. Several research issues for the IP over WDM networks are also identified. key words: Internet, IP (Internet Protocol), TCP ...

Current optical networks are migrating to wavelength division multiplexing (WDM)-based fiber transport between traditional electronic multiplexers/demultiplexers, routers, and switches. Passive optical add–drop WDM networks have emerged but an optical data network that makes full use of the technologies of dynamic optical routing and switching exists only in experimental test-beds. This paper w...