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Full-Text Articles in Engineering
Locating 1-D Bar Codes In Dct-Domain, Alexander Tropf, Douglas Chai
Locating 1-D Bar Codes In Dct-Domain, Alexander Tropf, Douglas Chai
Research outputs pre 2011
Today's digital cameras and camera phones allow users to capture bar codes, which are used to uniquely identify consumer product. In this paper a fast algorithm is proposed that locates a 1-D bar code in the DCT-domain of a bar code image taken by a digital camera. The algorithm uses the DCT-transform properties to distinguish bar code from other texture, morphological operations to smooth the detected bar code area and the features of the extracted area lo detect position and orientation of a bar code in the image
Demonstration Of Tunable Optical Notch Filter Using 1-D Opto-Vlsi Processor, Chung Kiak Poh, Kamal Alameh, Zhenglin Wang
Demonstration Of Tunable Optical Notch Filter Using 1-D Opto-Vlsi Processor, Chung Kiak Poh, Kamal Alameh, Zhenglin Wang
Research outputs pre 2011
An opto-very-large-scale-integrated (opto-VLSI)-based tunable optical filter structure is demonstrated. Filter tunability is achieved by reconfiguring the holographic diffraction grating of an opto-VLSI processor, allowing virtually any type of filter response to be synthesized. A proof-of-concept tunable notch filter with wavelength span of 7 nm is experimentally verified
Improving The Steering Efficiency Of 1x4096 Opto-Vlsi Processor Using Direct Power Measurement Method, Chung Poh, Kamal Alameh
Improving The Steering Efficiency Of 1x4096 Opto-Vlsi Processor Using Direct Power Measurement Method, Chung Poh, Kamal Alameh
Research outputs pre 2011
We report optimization of the steering efficiency of the 1-D Opto-VLSI processor using direct power measurement method for wavelengths in the near-IR and 632 nm. Highest improvement observed for the signal and interport isolation is 8 dB and 12 dB respectively. This improved performance of the processor is crucial to the realization of low crosstalk reconfigurable optical add/drop multiplexers (ROADM) using Opto-VLSI processors.
Reconfigurable Photonic Rf Filter Based On Opto-Vlsi Processing, Rong Zheng, Kamal Alameh, Zhenglin Wang
Reconfigurable Photonic Rf Filter Based On Opto-Vlsi Processing, Rong Zheng, Kamal Alameh, Zhenglin Wang
Research outputs pre 2011
In this paper, a novel reconfigurable 5-tap photonic RF filter based on Opto-VLSI processor is proposed where an Opto-VLSI processor is used in conjunction with a 5-fibre Bragg grating (FBG) array to slice the spectrum of a broad band light source, thus achieving commensurate true-time delays and variable tap weights. The proposed photonic RF filterstructure is experimentally demonstrated by means of several examples which show the capability of the Opto-VLSI processor to synthesise transversal RF filter responses with adaptive weights.
Opto-Vlsi-Based Correlator Architecture For Multiwavelength Optical Header Recognition, Muhsen Aljada, Kamal E. Alameh, Khalid Al-Begain
Opto-Vlsi-Based Correlator Architecture For Multiwavelength Optical Header Recognition, Muhsen Aljada, Kamal E. Alameh, Khalid Al-Begain
Research outputs pre 2011
A novel optical correlator employing an opto-very-large-scale-integration (VLSI) processor to construct the routing lookup table, in conjunction with an array of fiber Bragg gratings (FBGs) for multiwavelength optical header recognition is demonstrated. The FBG array provides wavelength-dependent time delays, whereas the opto-VLSI processor generates wavelength intensity profiles that match arbitrary bit patterns. The recognition of 4-b optical patterns is experimentally demonstrated at 2.2 Gb/s by showing that the correlator produces an autocorrelation waveform of high peak whenever the input bit pattern matches the wavelength intensity profile.
A Hybrid P-Cycle Search Algorithm For Protection In Wdm Mesh Networks, Kungmang Lo, Daryoush Habibi, Alexander Rassau, Quoc Viet Phung, Hoang Nguyen, Byung Kang
A Hybrid P-Cycle Search Algorithm For Protection In Wdm Mesh Networks, Kungmang Lo, Daryoush Habibi, Alexander Rassau, Quoc Viet Phung, Hoang Nguyen, Byung Kang
Research outputs pre 2011
p-Cycle is a type of shared link protection for survivable wavelength-division multiplexing (WDM) mesh networks. p-Cycle not only retains ring-like restoration speeds, but also achieves capacity efficiency in mesh networks. However, finding the optimal set of p-cycles to protect all traffic demands within a reasonable response time is difficult. This is particularity true with dense meshes or large networks, because the number of candidates is huge. Generally, p-cycles are determined by using either Integer Linear Programming (ILP) or specifically designed heuristic algorithms. However, both methods need a set of efficient candidate cycles to tradeoff between the computational time and the …
High-Speed (2.5 Gbps) Reconfigurable Inter-Chip Optical Interconnects Using Opto-Vlsi Processors, Muhsen Aljada, Kamal Alameh, Yong Lee, Il-Sug Chung
High-Speed (2.5 Gbps) Reconfigurable Inter-Chip Optical Interconnects Using Opto-Vlsi Processors, Muhsen Aljada, Kamal Alameh, Yong Lee, Il-Sug Chung
Research outputs pre 2011
Reconfigurablele optical interconnects enable flexible and high-performance communication in multi-chip architectures to be arbitrarily adapted, leading to efficient parallel signal processing. The use of Opto-VLSI processors as beam steerers and multicasters for reconfigurable inter-chip optical interconnection is discussed. We demonstrate, as proof-of-concept, 2.5 Gbps reconfigurable optical interconnects between an 850nm vertical cavity surface emitting lasers (VCSEL) array and a photodiode (PD) array integrated onto a PCB by driving two Opto-VLSI processors with steering and multicasting digital phase holograms. The architecture is experimentally demonstrated through three scenarios showing its flexibility to perform single, multicasting, and parallel reconfigurable optical interconnects. To our …
Catastrophic And Parametric Fault Modelling For Photonic Systems, Muhsen Aljada, Adam Osseiran, Kamal Alameh
Catastrophic And Parametric Fault Modelling For Photonic Systems, Muhsen Aljada, Adam Osseiran, Kamal Alameh
Research outputs pre 2011
In this paper, we investigate the impact of the most common catastrophic and parametric faults in photonic systems. We demonstrate, using the example of a photonic correlator, the effectiveness of testing techniques for fault detection in photonic systems. To the best of our knowledge, this constitutes the first attempt to define a fault model and to develop a test methodology for photonic systems.
Distributed Wireless Optical Communications For Humanitarian Assistance In Disasters, Muhsen Aljada, Kamal Alameh, Khalid Al-Begain
Distributed Wireless Optical Communications For Humanitarian Assistance In Disasters, Muhsen Aljada, Kamal Alameh, Khalid Al-Begain
Research outputs pre 2011
We propose an optical wireless communication network architecture employing an all-optical central communication unit and optical transceiver units. The network can easily be installed when communication network facilities are partially damaged by a disaster. The network performance is simulated at 1Gbit/s, over 1km under different weather conditions.
Performance Analysis Of Gb/S Wdm Fddi Network, Muhsen Aljada, Kamal Alameh, Khalid Al-Begain
Performance Analysis Of Gb/S Wdm Fddi Network, Muhsen Aljada, Kamal Alameh, Khalid Al-Begain
Research outputs pre 2011
In this paper, we propose a time-token multi-Gb/s Wavelength Division Multiplexing Fibre Distributed Data Interface (WDM/FDDI) architecture and examine its throughput efficiency and delay under heavy load for different network configuration using discrete event simulator.
Dynamic Optical Comb Filter Using Opto-Vlsi Processing, Zhenglin Wang, Kamal Alameh, Rong Zheng, Chung Poh
Dynamic Optical Comb Filter Using Opto-Vlsi Processing, Zhenglin Wang, Kamal Alameh, Rong Zheng, Chung Poh
Research outputs pre 2011
Reconfigurable multi-channel optical filters are presented in this paper. The operation principle of the reconfigurable filter is based on the dynamic beam steering capacity of Opto-VLSI processor in conjunction with a high dispersion free space grating. The dispersion grating separates the input signal spectrum while the Opto-VLSI processor is driven by optimised phase holograms to dynamically select the wavelengths to be coupled into the output port. Experimental results show that up to 8 bands can be synthesised, with a wavelength tuning span of 10 nm and a 3dB bandwidth less than 0.5nm.
Magnetic Photonic Crystals: 1-D Optimization And Applications For The Integrated Optics Devices, Mikhail Vasiliev, Kamal E. Alameh, Vladimir I. Belotelov, Vyacheslav A. Kotov, Anotoly K. Zvezdin
Magnetic Photonic Crystals: 1-D Optimization And Applications For The Integrated Optics Devices, Mikhail Vasiliev, Kamal E. Alameh, Vladimir I. Belotelov, Vyacheslav A. Kotov, Anotoly K. Zvezdin
Research outputs pre 2011
The optimization of multilayer one-dimensional (1-D) magnetophotonic crystals (MPCs) with multiple phase shifts, enabling their design to be tailored to practical photonics applications, is reported. The properties of sample optimized structures suitable for application in infrared intensity modulators are discussed. A novel scheme of high-resolution magnetic field sensing using MPCs is proposed. The effect of material absorption on spectral properties is shown.
Effect Of Oblique Light Incidence On Magnetooptical Properties Of One-Dimensional Photonic Crystals, Mikhail Vasiliev, Vladimir I. Belotelov, Andrey N. Kalish, Vyacheslav A. Kotov, Anotoly K. Zvezdin, Kamal Alameh
Effect Of Oblique Light Incidence On Magnetooptical Properties Of One-Dimensional Photonic Crystals, Mikhail Vasiliev, Vladimir I. Belotelov, Andrey N. Kalish, Vyacheslav A. Kotov, Anotoly K. Zvezdin, Kamal Alameh
Research outputs pre 2011
We have investigated the magnetooptical properties of one-dimensional magnetic photonic crystals for the case of oblique light incidence. We developed a theoretical model based on the transfer matrix approach. We found several new effects such as transmittance resonance peak shift versus external magnetic field and the Faraday effect dependence on the incidence angle.We discuss several possible one-dimensional magnetic photonic crystals applications for the optical devices.
Joint Optimization In Capacity Design Of Networks With P-Cycle Using The Fundamental Cycle Set, Hoang Nguyen, Daryoush Habibi, Viet Q Phung, Stefan Lachowicz, Kungmang Lo, Byung Kang
Joint Optimization In Capacity Design Of Networks With P-Cycle Using The Fundamental Cycle Set, Hoang Nguyen, Daryoush Habibi, Viet Q Phung, Stefan Lachowicz, Kungmang Lo, Byung Kang
Research outputs pre 2011
We propose a joint optimization model for capacity design of networks with p-cycles. The model is based on a modified definition of network fundamental cycles and the available straddling links. Concepts about visible and hidden straddling links, which are essential components of our model are also introduced. This is the first ILP model for joint optimization of p-cycle network that can be solved without enumerating p-cycle candidates, and has the ability to achieve optimum solutions. In addition, the complexity of our proposed model is much smaller than any conventional models, particularly when applying to a planar network. This model is …
Efficient P-Cycle Design By Heuristic P-Cycle Selection And Refinement For Servivable Wdm Mesh Networks, Kungmang Lo, Daryoush Habibi, Quoc Viet Phung, Alexander Rassau, Hoang N. Nguyen
Efficient P-Cycle Design By Heuristic P-Cycle Selection And Refinement For Servivable Wdm Mesh Networks, Kungmang Lo, Daryoush Habibi, Quoc Viet Phung, Alexander Rassau, Hoang N. Nguyen
Research outputs pre 2011
Using p-Cycles to protect against single span failures in Wavelength-Division Multiplexing (WDM) networks has been widely studied. p-Cycle retains not only the speed of ring-like restoration, but also achieves the capacity efficiency over mesh networks. However, in selecting an optimal set of p-cycles to achieve the minimum spare capacity and fast computational time is an NP-hard problem. To address this issue, we propose a heuristic approach to iteratively select and refine a set of p-cycles, which contains two algorithms: the Heuristic p-Cycle Selection (HPS) algorithm, and the Refine Selected Cycles (RSC) algorithm. Our simulation results show that the proposed approach …
A Segmentation Method For Shared Protection In Wdm Networks, Quoc Viet Phung, Daryoush Habibi, Hoang Nguyen, Kungmeng Lo
A Segmentation Method For Shared Protection In Wdm Networks, Quoc Viet Phung, Daryoush Habibi, Hoang Nguyen, Kungmeng Lo
Research outputs pre 2011
Shared link and shared path protections have been recognized as preferred schemes to protect traffic flows against network failures. In recent years, another method referred to as Shared Segment Protection has been studied as an alternative solution for protection. This method is more flexible and efficient in terms of capacity utilization and restoration time. However, to our best knowledge, this method has mostly been studied in dynamic provisioning scenarios in which searching for restoration paths is dynamically performed after a failure has occurred. In this paper, based on the path segmentation idea, we propose a method to generate good candidate …