Prof. Mohammad Syuhaimi B. Abdul Rahman Profile

Prof. Mohammad Syuhaimi B. Abdul Rahman

Lecturer at Univ Kegansaan Malaysia

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Author

Publications (7)

Proceedings Article | 22 August 2017 Paper

Low-cost fused taper polymer optical fiber (LFT-POF) splitters for environmental and home-networking solution

L. Supian, Mohammad Syuhaimi Ab-Rahman, Mohd Hazwan Harun, Hadi Gunab, Malik Sulaiman, Nani Fadzlina Naim

Proceedings Volume 10453, 104530B (2017) https://doi.org/10.1117/12.2271396

KEYWORDS: Polymer optical fibers, Demultiplexers, Polymethylmethacrylate, Optical communications, Wavelength division multiplexing, Optical networks, Data communications, Phase only filters, Optical fibers, Optical testing

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SPIE Journal Paper | 18 May 2015

Effects of random sidewall roughness on optical power splitter

Mohammad Syuhaimi Abdul Rahman, Foze Saleh Ater, Rahmah Mohammad

OE, Vol. 54, Issue 05, 055103, (May 2015) https://doi.org/10.1117/12.10.1117/1.OE.54.5.055103

KEYWORDS: Waveguides, Scattering, Wave propagation, Geometrical optics, Cladding, Optical engineering, Integrated optics, Lithography, Reactive ion etching, Optical components

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The effect of optical waveguide sidewall roughness (SWR) on the performance of a 1×2 optical power splitter (OPS) using OptiBPM software for the first time is analyzed. A simulation model is presented to predict the relationship between the SWR and output optical power of OPS for different relatively wide ranges of waveguide width. In particular, different values of waveguide widths, i.e., from w=1 to 6 μm, and an average roughness depth ρ from 0 to 0.5 μm are considered. In addition, the corresponding insertion loss and uniformity are determined. The results show that output power decreases significantly as the SWR increases due to the increase of the scattering loss, especially for ρ≥0.3 μm and narrow waveguides (i.e., w≤3 μm) compared with relatively wider ones (i.e., w>3 μm). SWR can greatly increase the scattering loss leading to significant output power loss, which leads to an increase in insertion loss and uniformity. The conclusion drawn from the presented results provide guidelines for evaluation device performance before real fabrication.

Proceedings Article | 22 August 2014

Characteristics study of multimode directional coupler by elliptical point contacts and CMT

L. Supian, Harry Ramza, Mohd Syuhaimi Ab-Rahman, Norhana Arsad

Proceedings Volume 9286, 92863K (2014) https://doi.org/10.1117/12.2063541

KEYWORDS: Optical fibers, Directional couplers, Multimode fibers, Optical spheres, Polymers, Electronics engineering, Polymer optical fibers, Fiber to the x, Systems engineering, Defense and security

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The developed directional coupler using polymer optical fiber performance is studied analytically where related theories are integrated and the outcomes are analyzed. Important theories such as simplified coupled mode theory and elliptical point contacts are integrated where the parameters such as coupling length, distance between the two fibers cores and forces are varied. Using simplified coupled mode theory, coupling coefficient and coupling efficiency is obtained based on the parameters of multimode fiber coupler such as the operating wavelength, numerical apertures, coupling length and diameter of the cores. The two fibers are initially tapered at certain length at most 20 mm and attached to geometrical blocks with certain radii and the middle tapered regions of the fibers are brought closed in proximity and they are lapped to each other. Investigation of different radii of the geometrical blocks represents the effect of macro-bending when the fibers are bent when attached to the circular blocks. This concept is used to transfer the modes from first fiber to the second. Then a particular amount of load force is exerted upon one side of the blocks so that the gap is closed and leads to increment of coupling length between the two fibers. The various load force amount will give different coupling lengths and distances between the two cores, thus leading to different coupling efficiencies. Analytically the expression that represents the coupling efficiency with force is an integrated expression from simplified coupled mode theory and Hertz’s Law of elliptical point contacts. Optimized coupling efficiency obtained is as high as 70% for this study.

SPIE Journal Paper | 9 April 2014

Optimization of signal-to-noise ratio for wireless light-emitting diode communication in modern lighting layouts

Luqman Azizan, Mohammad Ab-Rahman, Mazen Hassan, A. Ashrif Bakar, Rosdiadee Nordin

OE, Vol. 53, Issue 04, 045103, (April 2014) https://doi.org/10.1117/12.10.1117/1.OE.53.4.045103

KEYWORDS: Signal to noise ratio, Light emitting diodes, Light sources and illumination, Telecommunications, Receivers, Wireless communications, Modulation, Photodetectors, Transmitters, Channel projecting optics

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White light-emitting diodes (LEDs) are predicted to be widely used in domestic applications in the future, because they are becoming widespread in commercial lighting applications. The ability of LEDs to be modulated at high speeds offers the possibility of using them as sources for communication instead of illumination. The growing interest in using these devices for both illumination and communication requires attention to combine this technology with modern lighting layouts. A dual-function system is applied to three models of modern lighting layouts: the hybrid corner lighting layout (HCLL), the hybrid wall lighting layout (HWLL), and the hybrid edge lighting layout (HELL). Based on the analysis, the relationship between the space adversity and the signal-to-noise ratio (SNR) performance is demonstrated for each model. The key factor that affects the SNR performance of visible light communication is the reliance on the design parameter that is related to the number and position of LED lights. The model of HWLL is chosen as the best layout, since 61% of the office area is considered as an excellent communication area and the difference between the area classification, Δp, is 22%. Thus, this system is applicable to modern lighting layouts.

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SPIE Journal Paper | 25 September 2013

Real-time monitoring and fault locating using amplified spontaneous emission noise reflection for tree-structured Ethernet passive optical networks

Nani Naim, Mohammad Ab-Rahman, Nur Kamaruddin, Ahmad Bakar

OE, Vol. 52, Issue 09, 096112, (September 2013) https://doi.org/10.1117/12.10.1117/1.OE.52.9.096112

KEYWORDS: Fiber Bragg gratings, Power meters, Optical amplifiers, Passive optical networks, Tunable filters, Optical networks, Receivers, Signal attenuation, Electronic filtering, S band

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Nowadays, optical networks are becoming dense while detecting faulty branches in the tree-structured networks has become problematic. Conventional methods are inconvenient as they require an engineer to visit the failure site to check the optical fiber using an optical time-domain reflectometer. An innovative monitoring technique for tree-structured network topology in Ethernet passive optical networks (EPONs) by using the erbium-doped fiber amplifier to amplify the traffic signal is demonstrated, and in the meantime, a residual amplified spontaneous emission spectrum is used as the input signal to monitor the optical cable from the central office. Fiber Bragg gratings with distinct center wavelengths are employed to reflect the monitoring signals. Faulty branches of the tree-structured EPONs can be identified using a simple and low-cost receiver. We will show that this technique is capable of providing monitoring range up to 32 optical network units using a power meter with a sensitivity of −65 dBm while maintaining the bit error rate of 10 −13 .

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SPIE Journal Paper | 2 March 2012

Optical properties and indentation hardness of thin-film acrylated epoxidized oil

Mohammad Syuhaimi Abdul Rahman, Khaled Shaktur, Rahmah Mohammad, Wan Aimi Zalikha, Norwimie Nawi, Ahmad Faiza Mohd

OE, Vol. 51, Issue 02, 025002, (March 2012) https://doi.org/10.1117/12.10.1117/1.OE.51.2.025002

KEYWORDS: Refractive index, Thin films, Ultraviolet radiation, Waveguides, Polymers, Birefringence, Prisms, Optical properties, Polarization, Optical engineering

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Epoxy acrylate has been widely used as optical resin for applications such as cladding, the core of a waveguide, and other photonic devices. In this study, sustainable resin from edible oil was used as an alternative to epoxy acrylate. Structural features and the transmission of planar thin-film resin from an ultraviolet-visible spectroscopy (UV-VIS) spectrometer were investigated upon UV exposure. It was found that high transmission still persists for all samples with and without an UV absorber for exposed and unexposed samples. The film was found to absorb strongly below 400 nm. A change in the cut-off wavelength was observed upon exposure. Thin-film hardness and its dynamic indentation in the load-unload mode with different test forces were evaluated. Vickers hardness and the elastic modulus were determined for unacrylated epoxidized soybean oil (ESO) and acrylated epoxidized soybean oil (AESO). It was found that the AESO has a higher Vickers hardness and elastic modulus than those of unacrylated thin film. The Vickers hardness and elastic modulus were found to increase as the applied test force increased. The refractive index, thickness, and modes present were characterized from a spin-coated planar thin film. The refractive index in the transverse electric mode (TE) and transverse magnetic mode (TM) were determined and compared for unacrylated and acrylated epoxidized oil.

Proceedings Article | 28 December 2007

Novel 3D modeling of In0.53Ga0.47As lateral PIN photodiode

P. Susthitha Menon, Kumarajah Kandiah, Mohd Syuhaimi bin Abd Rahman, Sahbudin Shaari

Proceedings Volume 6798, 679819 (2007) https://doi.org/10.1117/12.759055

KEYWORDS: 3D modeling, Indium gallium arsenide, Signal to noise ratio, PIN photodiodes, Instrument modeling, Statistical modeling, Gallium, Diffusion, Electrodes, Standards development

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The lateral PIN photodiode (LPP) can be fabricated with ease using standard CMOS techniques such as diffusion or ion implantation to form the p+ and n+ wells in the absorbing layer. A novel diffusion-based three-dimensional LPP was modeled utilizing In_0.53Ga_0.47As as the absorbing layer. Interdigitated electrode structures were used to obtain responsivity of ~0.5-0.6 A/W and -3dB frequency of ~14-15 GHz at a wavelength of 1550 nm, bias voltage of 5V and optical power of 10 Wcm^-2. The modeled device is able to cater for 10 Gbit/s optical communication networks.

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