Tawfik Ismail

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In this paper, average bit error rate (BER) and outage probability are analysed in the free-space optical (FSO) system employing subcarrier intensity modulation (SIM) with differential phase shift keying (DPSK). The FSO channel is described by the lognormal atmospheric turbulence and the pointing error effects. Closed-form analytical expressions for the(More)
Optical Packet Switching (OPS) is a promising technology to enable next-generation high-speed IP networks. One of the main components in an OPS network is the optical switch architecture that provides the basic functionality of switching packets from input ports to the desired output ports while maintaining data in the optical domain. In asynchronous OPS(More)
Increasing demand in data-traffic has been addressed over the last few years. It is expected that the data-traffic will present the significant part of the total backbone traffic. Accordingly, much more transmission systems will be required to support this growth. A free space optic (FSO) communication is the greatest promising technology supporting(More)
Optical packet switching (OPS) is a promising technology to enable next-generation high-speed IP networks. A major issue in OPS is packet contention that occurs when two or more packets attempt to access the same output fiber. In such a case, packets may be dropped, leading to degraded overall switching performance. Several contention resolution techniques(More)
Round robin arbiter (RRA) is a critical block in nowadays designs. It is widely found in System-on-chips and Network-on-chips. The need of an efficient RRA has increased extensively as it is a limiting performance block. In this paper, we deliver a comparative review between different RRA architectures found in literature. We also propose a novel efficient(More)
Simultaneous power exchange between two input signals, has been theoretically and experimentally demonstrated based on two phenomena: Four Wave Mixing (FWM) in High-Linear Dispersion Shifted Fiber (HNL-DSF) and Three Wave Mixing (TWM) in NonLinear Photonic Crystals (NL-PC). These phenomena have been used in many applications in WDM optical networks such as,(More)
  • Tawfik Ismail
  • IEEE/OSA Journal of Optical Communications and…
  • 2015
All-optical packet switching (OPS) is one of the promising technologies for the next generation of optical networks. It realizes the packet switching in optical domain that eliminates optical-electrical and electrical- optical conversions. One of the main components in an OPS network is the optical interconnect that provides the basic functionality of(More)
This paper outlines an approach to optical feedforward linearisation technique to reduce nonlinear distortion generated by a directly modulated semiconductor laser diode for Wireless Local Area Network (WLAN) operating in the Industrial Scientific -Medical (ISM) band 2.4 GHz (IEEE802.11b) for Radio over Fibre (RoF). Various linearization techniques are(More)