Wyniki wyszukiwania dla: K. Dimyati

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Uric acid sensing using tapered silica optical fiber coated with zinc oxide nanorods

H. H. M. Yusof, H. R. A. Rahim, S. Thokchom, K. Dimyati, więcej

Microwave and Optical Technology Letters > 60 > 3 > 645 - 650

In this paper, fiber‐optic sensors by different tapered lengths of silica optical fiber (SOF) coated with zinc oxide (ZnO) nanorods were fabricated and demonstrated to detect different concentrations of uric acid. The SOFs were tapered in the length of 1 cm, 3 cm, 5 cm, and 7 cm using flame brushing technique. ZnO nanorods were coated on the surface of the tapered SOFs for 24 hours using sol‐gel immersion...

artykuł

Performance comparison of enhanced Erbium–Zirconia–Yttria–Aluminum co-doped conventional erbium-doped fiber amplifiers

A.M. Markom, M.C. Paul, A. Dhar, S. Das, więcej

Optik - International Journal for Light and Electron Optics > 2017 > 132 > C > 75-79

A new Erbium–Zirconia–Yttria–Aluminum co-doped fiber amplifier (Zr-EDFA) with improved gain and noise figure characteristics is successfully demonstrated using a newly developed Erbium–Zirconia–Yttria–Aluminum Co-Doped fiber (Zr-EDF) as the gain medium. The fiber consists of Er₂O₃-doped ZrO₂ rich nano-crystalline particles and thus it has a high erbium doping concentration with absorption pump power...

artykuł

Q-switched 2µm thulium bismuth co-doped fiber laser with multi-walled carbon nanotubes saturable absorber

N. Saidin, D.I.M. Zen, F. Ahmad, H. Haris, więcej

Optics & Laser Technology > 2016 > 83 > C > 89-93

We report a passively Q-switched fiber laser operating at 1900nm region using the newly developed thulium bismuth co-doped lithium-alumino-germano-silicate fiber (TBF) as a gain medium in conjunction with a multiwall carbon nanotubes (MWCNTs) based saturable absorber (SA). The TBF and MWCNTs are fabricated and prepared in-house. By increasing the 802nm pump power from 106.6 to 160mW, stable generation...

rozdział

ABR Congestion Control in ATM Networks Using Neural Networks

K. Dimyati, C. O. Chow

Lecture Notes in Computer Science > Networking — ICN 2001 > ATM Networks (II) > 687-696

This paper presents the Neural Indicates Explicit Rate (NIER) scheme, in which an artificial neural network (ANN) is used to obtain suitable Explicit Rate (ER) for congestion control of Available Bit Rate (ABR) service in ATM networks. The neural network used in this scheme will monitor the queue status in switches’ buffer and output suitable ER value to be carried by Resource Management (RM) cells...

artykuł

Robust stopping criterion in signal-to-noise ratio uncertainty environment

R. Mohamad, H. Harun, M. Mokhtar, W.A.W Adnan, więcej

Electronics Letters > 2015 > 51 > 23 > 1875 - 1877

A robust stopping criterion (called online-BER [OB]) that can terminate iterative turbo decoding in a signal-to-noise ratio (SNR) uncertainty environment is proposed. OB is based on the online bit error rate (BER) estimation and the BER thresholds. Both values are used to detect convergence and non-convergence decoder output and also to halt iterative decoding in various SNRs. Unlike other well-known...

rozdział

A new power control game in two-tier femtocell networks

Y. A. Al-Gumaei, K. A. Noordin, A. W. Reza, K. Dimyati

2015 1st International Conference on Telematics and Future Generation Networks (TAFGEN) > 131 - 135

2015 1st International Conference on Telematics and Future Generation Networks (TAFGEN)

In this paper, the problem of distributed power control is investigated and analyzed for two-tiered femtocell networks that share the same frequency band with the central macrocell. Femtocell users are associated with a proper utility function via pricing, which represents the ratio of user's signal-to-interference-noise ratio (SINR) and the exponential price of power consumed. Assuming a femtocell...

artykuł

Thulium Bismuth Co-Doped Fiber Lasers at 1901 nm by 802 nm Pumping

Arindam Halder, N. Saidin, D. I. M. Zen, S. S. A. Damanhuri, więcej

IEEE Journal of Selected Topics in Quantum Electronics > 2014 > 20 > 5 > 1 - 6

We demonstrate an efficient fiber laser operating at 1901.6 nm using a new Thulium Bismuth co-doped fiber (TBF) under 802 nm pumping. The TBF was fabricated using modified chemical vapor deposition process associated with optimized solution doping techniques. The TBF lasers at 1901.6 nm are obtained at a noticeably low threshold pump power of 75–92 mW using two fiber Bragg gratings in a Fabry–Perot...

rozdział

Evaluation of direct modulation and external modulation in temporal phase encoding system

Go Yun Ii, K. Dimyati

2013 IEEE 11th Malaysia International Conference on Communications (MICC) > 452 - 455

2013 IEEE Malaysia International Conference on Communications (MICC)

This paper aims to evaluate the system performance in term of bit error rate (BER) in an optical code division multiple access (OCDMA) metropolitan area network using direct modulation and external modulation technique. A four-user system is developed and tested up to 100 km at 10 Gbps. A set of twenty and twenty-five chips unique optical code sequences is applied to encrypt the data via appropriate...

rozdział

All-fiber graphene passively Q-switched nanosecond Thulium doped fiber laser at 1900 nm

N. Saidin, F. Ahmad, D. I. M. Zen, B. A. Hamida, więcej

2013 IEEE International Conference on Smart Instrumentation, Measurement and Applications (ICSIMA) > 1 - 4

2013 IEEE International Conference on Smart Instrumentation, Measurement and Applications (ICSIMA)

We successfully demonstrated a simple, compact and low cost passive Q-switched Thulium doped fiber laser (TDFL) at long wavelength of 1854.3 nm regions in conjunction with 1552 nm pump excitation. A stable pulse has been generated using graphene film based saturable absorber (SA). The graphene is synthesized by electrochemical exfoliation of graphite at room temperature in 1% sodium dodecyl sulphate...

artykuł

All‐Fiber Dual‐Wavelength Thulium–Bismuth Codoped Fiber Laser

N. Saidin, D. I. M. Zen, S. S. A. Damanhuri, S. W. Harun, więcej

Microwave and Optical Technology Letters > 55 > 10 > 2324 - 2326

We report a room temperature all‐fiber dual‐wavelength Thulium–Bismuth codoped fiber laser operating in 1900 nm region using a single fiber Bragg grating (FBG) in a ring configuration. The addition of Bismuth ions as codopant in the gain medium enhances the inhomogeneous broadening effect in the fiber and thus allows a dual‐wavelength oscillation with the assistance of the FBG that has a flat top...

artykuł

Theoretical analysis and fabrication of tapered fiber

S.W. Harun, K.S. Lim, C.K. Tio, K. Dimyati, więcej

Optik - International Journal for Light and Electron Optics > 2013 > 124 > 6 > 538-543

Adiabaticity criteria and optimal shapes for tapered fiber are theoretically analyzed. In the analysis, it is discovered that a narrower taper waist can be achieved by using a small hot-zone length or increases the elongation distance. The tapered fiber fabrication based on flame brushing technique is then demonstrated using a homemade fiber tapering rig. The heat source comes from an oxy-butane torch...

artykuł

Effect of loop diameter on the performance of MKR‐based dual‐wavelength erbium‐doped fiber laser

Azlan Sulaiman, Sulaiman Wadi Harun, S. F. Norizan, K. Dimyati, więcej

Microwave and Optical Technology Letters > 55 > 2 > 236 - 238

A dual‐wavelength Erbium‐doped fiber laser (EDFL) is demonstrated using a 1.5‐m long EDF with a microfiber knot resonator (MKR) structure at the output end. The MKR is fabricated by heating and stretching a 3‐cm long piece of EDF to form a microfiber, which is then manipulated to create a knot. The performance of the EDFL is investigated for two different MKR loop diameters. At a loop diameter of...

artykuł

Supercontinuum generation using a passive mode-locked stretched-pulse bismuth-based erbium-doped fiber laser

N.S. Shahabuddin, N.A. Awang, H. Ahmad, H. Arof, więcej

Optics and Laser Technology > 2012 > 44 > 4 > 741-743

A Supercontinuum (SC) generation in photonic crystal fiber (PCF) is demonstrated using an amplified picosecond stretched-pulses from a passive mode-locked Bismuth-based Erbium-doped fiber laser (Bi-EDFL). The Bi-EDFL employs of a piece of a highly nonlinear 49cm long Bismuth-based Erbium-doped fiber (Bi-EDF), an optical isolator and a polarization controller in a cavity to generate a mode-locked stretched-pulse...

rozdział

Implementation and Simplification of Digital Baseband Signal Processing Functions on DSP Processor

R Mohamad, W N Syafizan, K Dimyati

2010 Second International Conference on Computational Intelligence, Modelling and Simulation > 330 - 334

2010 Second International Conference on Computational Intelligence, Modelling and Simulation (CIMSiM 2010)

Paper presents the implementation of digital baseband signal processing with Output Shifted Coded Modulation (OSCM) function on Digital Signal Processor (DSP) Kit TMS320C6711. Single DSP chip is used to implement the baseband processing function due to compactness, low-power consumption and flexibility. Although FPGA is compact and high performance, it consumes much more power whereas ASIC has the...

artykuł

Enhanced bundle fiber displacement sensor based on concave mirror

H.Z. Yang, K.S. Lim, S.W. Harun, K. Dimyati, więcej

Sensors & Actuators: A. Physical > 2010 > 162 > 1 > 8-12

Fiber optic displacement sensor (FODS) is proposed using a concave mirror for enhanced flexibility in sensitivity selection and linear range. The effect of focal length and diameter of the concave mirror on the displacement response is investigated. The experimental and theoretical results show that the second dip of the displacement response is located at distance equivalent to twice of focal length...

rozdział

Information Retrieval from Distributed Relational Biodiversity Databases

K K S Sarinder, L H S Lim, A F Merican, K Dimyati

2010 Second International Conference on Computer Research and Development > 432 - 435

Second International Conference on Computer Research and Development (ICCRD 2010)

This paper focuses on information retrieval from relational databases on biodiversity content of flora and fauna in Malaysia. The retrieval process was done considering factors such as the databases are distributed, located in Windows as well as Linux platforms, developed using a variety of Database Management Systems and the structure of the tables are not standardized. Structured Query Language...

artykuł

Multiple Brillouin Stokes generation with bismuth‐based erbium‐doped fiber

S. Shahi, S. W. Harun, K. Dimyati, M.R. Tamjis, więcej

Microwave and Optical Technology Letters > 52 > 6 > 1416 - 1418

A multiple Brillouin Stokes generation is demonstrated at extended L‐band region using the bismuth‐based erbium‐doped fiber (Bi‐EDF) in the linear cavity. A 2.15‐m long Bi‐EDF is used to provide both nonlinear and linear gains to generate a stimulated Brillouin scattering (SBS) and to amplify the generated SBS, respectively. The Brillouin erbium fiber laser operates at 1615 nm region with more than...

rozdział

Performance Parameter of Mobile WiMAX : A Study on the Physical Layer of Mobile WiMAX under Different Communication Channels & Modulation Technique

Omar Arafat, K Dimyati

2010 Second International Conference on Computer Engineering and Applications > 2 > 533 - 537

2010 Second International Conference on Computer Engineering and Applications (ICCEA 2010)

Mobile WiMAX is a broadband wireless solution that enables convergence of mobile and fixed broadband network through a common wide area broadband radio access technology and flexible network architecture.Performance evaluation of mobile WiMAX under varying channel is one of the convincing research interest.Most of the existing works,based on performance evaluation under channel condition are limited...

rozdział

Improvement of Decision Making Protocol for Duty Cycle Division Multiplexing (DCDM) System

M.N. Derahman, K. Dimyati, A.M. Mohammadi, M.K. Abdullah

2010 Second International Conference on Future Networks > 155 - 158

2010 Second International Conference on Future Networks (ICFN 2010)

Duty Cycle Division Multiplexing (DCDM) has been shown to be able to improve utilization of the optical bandwidth. However, the challenge arises on its signal recovery at the receiver ends. Decision making protocol plays an important role to determine the correctness of its regenerated data. Previous approach regenerate inaccurate data due to its assumption that all received signals are valid. Thus,...

rozdział

Development of a novel atomization-based solution doping method for incorporating rare-earth into silica glass layers

H.A. Dohee, K. Dimyati, F.R.M. Adikan

2009 International Conference for Technical Postgraduates (TECHPOS) > 1 - 3

2009 International Conference for Technical Postgraduates (TECHPOS 2009)

This paper discusses a novel approach in solution doping of silica layers for optically active samples instead of immersing pre-sintered samples into an aqueous solution, a nebulizer based approach was adapted in achieving this approach.

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Wyniki wyszukiwania dla: K. Dimyati

Uric acid sensing using tapered silica optical fiber coated with zinc oxide nanorods

Performance comparison of enhanced Erbium–Zirconia–Yttria–Aluminum co-doped conventional erbium-doped fiber amplifiers

Q-switched 2µm thulium bismuth co-doped fiber laser with multi-walled carbon nanotubes saturable absorber

ABR Congestion Control in ATM Networks Using Neural Networks

Robust stopping criterion in signal-to-noise ratio uncertainty environment

A new power control game in two-tier femtocell networks

Thulium Bismuth Co-Doped Fiber Lasers at 1901 nm by 802 nm Pumping

Evaluation of direct modulation and external modulation in temporal phase encoding system

All-fiber graphene passively Q-switched nanosecond Thulium doped fiber laser at 1900 nm

All‐Fiber Dual‐Wavelength Thulium–Bismuth Codoped Fiber Laser

Theoretical analysis and fabrication of tapered fiber

Effect of loop diameter on the performance of MKR‐based dual‐wavelength erbium‐doped fiber laser

Supercontinuum generation using a passive mode-locked stretched-pulse bismuth-based erbium-doped fiber laser

Implementation and Simplification of Digital Baseband Signal Processing Functions on DSP Processor

Enhanced bundle fiber displacement sensor based on concave mirror

Information Retrieval from Distributed Relational Biodiversity Databases

Multiple Brillouin Stokes generation with bismuth‐based erbium‐doped fiber

Performance Parameter of Mobile WiMAX : A Study on the Physical Layer of Mobile WiMAX under Different Communication Channels & Modulation Technique

Improvement of Decision Making Protocol for Duty Cycle Division Multiplexing (DCDM) System

Development of a novel atomization-based solution doping method for incorporating rare-earth into silica glass layers

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