Showing papers by "Mike J. O'Mahony published in 1998"
TL;DR: In this article, a unified study of the noise characteristics of semiconductor lasers with optical feedback and short external cavity length is presented. And the effect of the variation of some of the laser diode parameters on the relative intensity noise (RIN) is calculated by using a numerical solution of these equations.
Abstract: A unified study of the noise characteristics of semiconductor lasers with optical feedback and short external cavity length is presented. A new set of nonlinear rate equations that can describe a laser diode with any amount of optical feedback is proposed. The relative intensity noise (RIN) is calculated by using a numerical solution of these equations. This paper concentrates mainly on the moderate and strong feedback regimes. The spectral phenomena observed during the transition from the weak feedback to the "coherence collapse" regime and then to the strong feedback regime are studied and explained. The effect of the variation of some of the laser diode parameters on the RIN characteristics is also investigated.
90 citations
TL;DR: All-optical routing of 2.5 Gbit/s wavelength division multiplexed (WDM) signals across two cascaded optical cross-connects with a penalty of only 0.6 dB has been demonstrated using tunable wavelength converters and a passive WDM router.
Abstract: All-optical routing of 2.5 Gbit/s wavelength division multiplexed (WDM) signals across two cascaded optical cross-connects with a penalty of only 0.6 dB has been demonstrated using tunable wavelength converters and a passive WDM router.
6 citations
TL;DR: In this article, an integrated device consisting of two cascaded 2/spl times/2 crosspoint switches has been utilized to demonstrate a highly functional integrated routing and wavelength converting switch architecture at a data rate of 2.488 Gb/s.
Abstract: An integrated device consisting of two cascaded 2/spl times/2 crosspoint switches has been utilized to demonstrate a highly functional integrated routing and wavelength converting switch architecture at a data rate of 2.488 Gb/s. This aliens simultaneous space switching and wavelength conversion of optical signals in wavelength-division multiplexed (WDM) networks. Eye diagrams and bit-error-rate (BER) curves are displayed for wavelength conversion and simultaneous routing of a separate signal.
6 citations
TL;DR: The authors describe an architecture for an all-optical packet-switched routing node which eliminates the detrimental effects of intra-band crosstalk arising from filterless wavelength converters employing cross-gain modulation in semiconductor optical amplifiers.
Abstract: The authors describe an architecture for an all-optical packet-switched routing node which eliminates the detrimental effects of intra-band crosstalk arising from filterless wavelength converters employing cross-gain modulation in semiconductor optical amplifiers. A dual-stage wavelength conversion scheme and an arrayed-waveguide grating for optical routing demonstrates < 0.9 dB power penalty for 800 Mbit/s payloads.
4 citations
17 Jun 1998
TL;DR: In this article, all-optical routing of 25 Gbit/s WDM signals across two cascaded optical cross connects (OXCs) with a penalty of only 6 dB was demonstrated using tuneable wavelength converters and a passive WDM router.
Abstract: All-optical routing of 25 Gbit/s WDM signals across two cascaded optical cross connects (OXCs) with a penalty of only 06 dB has been demonstrated using tuneable wavelength converters and a passive WDM router
2 citations
01 Dec 1998
TL;DR: In this paper, all-optical routing of 2.5 Gbit/s WDM signals across two cascaded optical cross connects (OXCs) with a penalty of only 0.6 dB has been demonstrated using tuneable wavelength converters and a passive WDM router.
Abstract: All-optical routing of 2.5 Gbit/s WDM signals across two cascaded optical cross connects (OXCs) with a penalty of only 0.6 dB has been demonstrated using tuneable wavelength converters and a passive WDM router.
1 citations
22 Feb 1998
TL;DR: In this article, the authors studied the effect of WDM on optical transport and access networks, using modeling and experiment to understand the benefits of such approaches and showed that the network end-to-end performance is a function of many variables, which may have different statistical properties and is also dependent on the size and topology of the network.
Abstract: Summary form only given. In recent years there has been increased activity in studying the application of WDM techniques to networking in addition to straight point-to-point systems. In particular, attention has been paid to optical transport and access networking, using modeling and experiment to understand the benefits of such approaches. Optical networks have different and more complex characteristics than point-to-point systems and hence understanding the transmission limitations associated with such networks requires more complex modeling. The network end-to-end performance is a function of many variables, which may have different statistical properties, and is also dependent on the size and topology of the network. Examples of major network related issues are given: crosstalk; amplifier gain flatness and equalization; wavelength converter impairment; active switches; filter cascades and stability; gated amplifiers.
1 citations