Showing papers by "Mike J. O'Mahony published in 1995"
TL;DR: Much activity in WDM has been understanding its limitations and improving component performance, and some of the limitations imposed may be overcome by the use of OTDM, and research in this area continues to be of interest and importance.
Abstract: WDM systems are maturing and are in use in real point-to-point applications. The technology has also become of interest in the development of all-optical networks, and in this context the performance of WDM can be more critical. In some networks, multiple-access demands that a large number of channels be deployed over long distances, and in these cases the performance of WDM may be degraded by crosstalk arising from fiber nonlinearity. Other problems arise from non-ideal components such as optical amplifiers, switches, and multiplexers/demultiplexers, Much activity in WDM has been understanding its limitations and improving component performance, Some of the limitations imposed may be overcome by the use of OTDM, and research in this area continues to be of interest and importance. However, OTDM is less mature, and much activity is concerned with the realization of robust subsystems such as sources and demultiplexers. It is likely that in the longer term networks will employ a combination of WDM and OTDM.
20 citations
26 Feb 1995
TL;DR: Three general multi-λ OXC node schemes, two basic optical-cross-talk mechanisms, interband and intraband cross talks, generated by nonideal wavelength-channel (λ-channel) demultiplexing and optical space switching are established.
Abstract: Optical cross talks imposes a major limit to the practical implementation of multiwavelength optical cross-connect (multi- λ OXC) networks1-4 Optical cross talks in various multi-λ OXC node realizations may manifest themselves differently in terms of source, interference properties, and accumulation behaviors On the basis of three general multi-λ OXC node schemes, two basic optical-cross-talk mechanisms, interband and intraband cross talks, generated by nonideal wavelength-channel (λ-channel) demultiplexing (DEMUX) and optical space switching, are established With these elements and their properties clearly outlined, guidelines to component and network architecture design for minimizing cross-talk impairments can be derived
6 citations
TL;DR: In this article, size limitations of optical switching structures employing semiconductor laser amplifiers arising from signal extinction ratio, amplifier gain, and optical filter bandwidth were investigated theoretically and experimentally.
Abstract: Size limitations of optical switching structures employing semiconductor laser amplifiers arising from signal extinction ratio, amplifier gain, and optical filter bandwidth are investigated theoretically and experimentally. Simulations reveal that the maximum number of SLA that can be cascaded in an optical switching structure increases with increasing input signal extinction ratio, optical gain of each SLA and decreases with increasing SLA noise figure, optical filter bandwidth and input signal bit rate. >
5 citations
26 Feb 1995
TL;DR: In this paper, the first study of cascading a gain-saturated semiconductor-laser-amplifier (SLA) wavelength converter (WC) is presented.
Abstract: The gain-saturated semiconductor-laser-amplifier (SLA) wavelength converter (WC) operates by the presence (absence) of a modulated optical input signal reducing (increasing) the gain experienced by a cw optical pump at a different wavelength.1 In a wavelength-division-multiplexed (WDM) network, a signal might pass through several WCs during its passage. To our knowledge, this is the first study of cascading this type of WC.