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| 1 | Dark pulse emission in nonlinear polarization rotation-based multiwavelength mode-locked erbium-doped fiber laser显示文摘We experimentally show dark pulse generation in all-normal dispersion multiwavelength erbium-doped fiber laser(EDFL) with a long cavity of figure-of-eight configuration. The EDFL generates a stable multiwavelength laser with 0.47 nm spacing at 24 m W threshold pump power, while the number of lines obtained increases with the pump power. A dark pulse emission is observed as the pump power is increased above 137 m W, with fundamental repetition rate of 29 k Hz and pulse width of 2.7 μs. It is observed that the dark pulse train can be shifted to second-, third-, and fourth-order harmonic dark pulses by carefully adjusting the polarization controller. For the fundamental dark pulse, the maximum pulse energy of 32.4 n J is obtained at pump power of 146.0 mW. | Zian Cheak Tiu Sin Jin Tan Harith Ahmad Sulaiman Wadi Harun | 2014 | Chinese Optics Letters2014，12，11： | 2 |
| 2 | Multiwavelength,bi-directional operation of twincavity Brillouin/Erbium laser 显示文摘 | Abdullah Khazani M Harith Ahmad | 2000 | Opt Commun2000，181，： | 1 |
| 3 | Mulit - Wavelength generation of dual - cavity Brillouin/Erbium fiber lasers 显示文摘 | M Kamil Abd- Rahman M Khazani Abdullah Harith Ahmad | 2000 | Journal of Mordinear Optical Physics&Materials2000，9，： | 1 |
| 4 | Ring microfiber coupler erbium-doped fiber laser analysis显示文摘A non-adiabatic microfiber coupler is fabricated by flame brushing technique and then theoretically and experimentally analyzed.The effective length of the microfiber coupler is determined by simulation,and a low-noise laser is demonstrated using various lengths of erbium-doped fiber(EDF) when incorporated in a laser setup.At 18.6-mW input pump power,the maximum output power of 20 μW and the lowest lasing threshold of 3.8 mW are obtained with a 90-cm-long EDF. | Azlan Sulaiman Sulaiman Wadi Harun Harith Ahmad | 2014 | Chinese Optics Letters2014，12，2： | 1 |
| 5 | Influence of Internal Stresses in Few-Mode Fiber on the Thermal Characteristics of Regenerated Gratings显示文摘The pre-treatment of few-mode fibers (FMFs) has been successfully done with CO2 laser The wavelength difference, AA between the two resonant wavelengths in the few-mode fiber Bragg grating (FMFBG) varies with temperature increment during the annealing process. The results show that the treated fibers with lower stresses have lower thermal sensitivity in △λ than that of non-treated fiber. However, the treated fibers produce FMFBGs with better thermal durability and regeneration ratio. It is conceived that the presence of those stresses in the pristine fiber is responsible for the high thermal sensitivity in △λ. The thennal relaxation of stresses and structural rearrangement during the thennal annealing process are responsible for the degradation of the strength and resilience of the regenerated grating. | Nurul Asha MOHD NAZAL Kok Sing LIM Yen Sian LEE Muhammad Aizi MAT SALIM Harith AHMAD | 2019 | Photonic Sensors2019，9，2： | 1 |
| 6 | Multiwavelength, bi-directional operation of twincavity Brillouin/Erbium laser 显示文摘 | Abd-Rahman Kamil M Abdullah Khazani M Harith Ahmad | 2000 | Opt Commun2000，181，： | 1 |
| 7 | Q-Switching Pulse Generation with Thulium-Doped Fiber Saturable Absorber显示文摘 | Zian Cheak Tiui Arman Zarei Sin Jin Tan Harith Ahmad Sulaiman Wadi Harun | 2014 | Chinese Physics Letters2014，31，12： | 1 |
| 8 | Long-wavelength-band Er+3-doped fiber amplifier incorporating a ring-laser as a seed signal generator显示文摘 | Harith Ahmad | 2001 | IEEE Journal on Selected Topics in Quantum Electronis2001，7，1： | 1 |
| 9 | A Partial Double-Pass S-Band Erbium-Doped Fibre Amplifier显示文摘有效、低的噪音短波长乐队做耳的纤维放大器(S 乐队 EDFA ) 用双通行证配置被建议并且示威。这个放大器象 26.9 dB 一样高提供 1500 nm 信号的获得,它比二阶段的 single-passamplifier 高是 9.6 dB。获得的相应噪音数字是 7.5 dB,它具有在 thesingle 传递,放大器和超过 2 dB 比以前报导的双通行证放大器降低的一样的水平[IEICE 电子。表示 2 (2005 ) 182 ] 。获得改进由于双 pass-propagationof 是在第二个舞台的测试信号,它增加有效做耳的纤维(EDF ) 长度。低噪音被归因于在 EDF 之间的光传播者,它阻止向后放大的自发的排放宣传进放大器的输入部分。Theproposed 放大器被期望在实际 S-bandEDFA 的发展起一个重要作用。 | Sulaiman Wadi Harun Nor Kamilah Saat Harith Ahmad | 2005 | Chinese Physics Letters2005，22，12： | 1 |
| 10 | Nonlinear Polarization Rotation-Based Mode-Locked Erbium-Doped Fiber Laser with Three Switchable Operation States显示文摘有三个可切换的操作状态的简单锁模式的做耳的纤维激光(EDFL ) 基于非线性的极化旋转被建议并且示威。EDFL 作为力量从 17.5 mW 的阀值增加到 34.3 mW 的 1480 nm 泵以 87 kHz 的第三泛音脉搏重复率产生稳定的方形的脉搏。方形的脉搏持续时间作为力量在这个区域以内增加的泵从 105 ns 增加到 245 ns。当泵力量从 48.2 mW 被改变到 116.7 mW,脉搏操作换到第二个操作状态。激光在泵力量区域以内与 8.5 s 的固定脉搏宽度以 29 kHz 的基本重复率操作。在 116.7 mW 的泵力量,平均产量力量是 3.84 mW,它对应于 131.5 nJ 的脉搏精力。当泵力量继续增加时,在它在 138.9 mW 的一个泵力量区域以内到达第三个稳定的操作状态到 145.0 mW 以前,脉搏火车经历不稳定的摆动。在这个区域以内, EDFL 生产 2.8 s 的固定脉搏宽度和 58 kHz 的泛音脉搏重复率。 | Zian Cheak Tiu Sin Jin Tan Arman Zarei Harith Ahmad Sulaiman Wadi Harun | 2014 | Chinese Physics Letters2014，31，9： | 0 |
| 11 | Generation of Q-Switched Mode-Locked Erbium-Doped Fiber Laser Operating in Dark Regime显示文摘We demonstrate a stable Q-switched mode-locked erbium-doped fiber laser(EDFL) operating in dark regime based on the nonlinear polarization rotation technique.The EDFL produces a pulse train where the Q-switching envelope is formed by multiple dark pulses.The repetition rate of the Q-switched envelope can be increased from 0.96 kHz to 3.26 kHz,whereas the pulse width reduces from 211 μs to 86 μs.The highest pulse of 479 nJ is obtained at the pump power of 55 mW.It is also observed that the dark pulses inside the Q-switching envelope consist of two parts:square and trailing dark pulses.The shortest pulse width of the dark square pulse is obtained at 40.5μs when the pump power is fixed at 145 mW.The repetition rate of trailing dark pulses can be increased from 27.62 kHz to 50 kHz as the pump power increases from 55 mW to 145 mW. | Zian Cheak Tiu Arman Zarei Harith Ahmad Sulaiman Wadi Harun | 2016 | Chinese Physics Letters2016，33，3： | 0 |
| 12 | All-Optical Humidity Sensor Using SnO_(2) Nanoparticle Drop Coated on Straight Channel Optical Waveguide显示文摘The straight channel optical waveguide coated with the SnO_(2) nanoparticle is studied as an all-optical humidity sensor.The proposed sensor shows that the transmission loss of the waveguide increases with increasing relative humidity(RH)from 56%to 90%with very good repeatability.The sensitivity to changes in relative humidity is~2 dB/%RH.The response time of the humidity sensor is 2.5 s,and the recovery time is 3.5 s.The response to humidity can be divided into 3 different regions,which are correlated to the degree of water adsorption in the SnO_(2) nanoparticle layer.Compared with the previous all-optical humidity sensor based on SnO_(2),the proposed sensor exhibits more rapid response,simpler fabrication process,and higher sensitivity.The proposed sensor has a potential application in the long distance,remote agriculture,and biological humidity sensing. | Nur Abdillah SIDDIQ Wu Yi CHONG Yono Hadi PRAMONO Melania Suweni MUNTINI Asnawi ASNAWI Harith AHMAD | 2020 | Photonic Sensors2020，10，2： | 0 |
| 13 | Graphene Oxide Functionalized Optical Planar Waveguide for Water Content Measurement in Alcohol显示文摘An abrupt change in optical transmission characteristic of a graphene oxide(GO)coated optical planar waveguide was observed.This observation was based on the peculiar characteristics of the graphene oxide film,namely its high transverse-electric polarized light propagation loss,highly selective permeability of water,and change in optical propagation characteristic in the presence of water.The as-fabricated GO-coated optical waveguide showed a large polarization dependent loss of~32 dB in the C-band optical fiber communication window(1550 nm).The response of the proposed sensor was first tested by using water.When a drop of water was applied onto the GO coating,the large polarization dependent loss was fully suppressed almost instantaneously.This effect was reversible as the polarization dependent loss was restored after complete water evaporation from the GO coating.All-optical measurement of water content in alcohol was then demonstrated by using the GO-coated optical waveguide.By analyzing the drying profile of the water-alcohol mixture,water content in the range of 0.2 volume%-100 volume%could be measured.These measurements were carried out by using solution volume of 1.0μL only.The all-optical sensing nature of the proposed sensor has potential applications in in-situ monitoring of water content in alcohol. | Wenghong LIM Yuenkiat YAP Choonkong LAI Wuyi CHONG Harith AHMAD | 2020 | Photonic Sensors2020，10，3： | 0 |
| 14 | Switchable Q-switched and mode-locked erbium-doped fiber laser operating in the L-band region显示文摘We demonstrate a switchable Q-switched and mode-locked erbium-doped fiber laser (EDFL) operating in the L-band region using the nonlinear polarization rotation effect. The switching operation is achieved by controlling intensity-dependent loss using a polarization controller. In Q-switching mode, the EDFL produces a pulse train with a repetition rate of 21.1 kHz, pulse width of 7.7 μs, and pulse energy of 13.6 nJ. The EDFL also generates a multi-wavelength comb with a very narrow and constant wavelength spacing of 0.045 nm and optical signal-to-noise ratio of at least 10 dB. During mode locking, the EDFL produces stretched pulses with 3-dB bandwidth of 26.2 nm, pulse width of 350 fs, repetition rate of 2.38 MHz, and pulse energy of 48.56 pJ. | Sin Jin Tan Sulaiman Wadi Harun Hamzah Arof Harith Ahmad | 2013 | Chinese Optics Letters2013，11，7： | 0 |
| 15 | Harmonic Dark Pulse Emission in Erbium-Doped Fiber Laser显示文摘在做耳的纤维激光的泛音黑暗脉搏代基于一种 figure-of-eight 配置被表明。泛音黑暗脉搏能从基础被转移到 5 由与适当极化控制器取向增加泵力量的 th 顺序泛音。20 kHz 的基本重复率在 29 mW 的泵力量被获得。42.6 nJ 的最高的脉搏精力以基本重复率被获得。黑暗脉搏火车的操作频率变到 2 nd , 3 rd , 4 th 和 5 泵驱动的 th 泛音分别地被增加到 34 mW, 50 mW, 59 mW 和 137 mW。 | Zian Cheak Tiu Arman Zarei Sin Jin Tan Harith Ahmad Sulaiman Wadi Harun | 2015 | Chinese Physics Letters2015，32，3： | 0 |
| 16 | Strain Sensor Based on Embedded Fiber Bragg Grating in Thermoplastic Polyurethane Using the 3D Printing Technology for Improved Sensitivity显示文摘A new and easy-to-fabricate strain sensor has been developed,based on fiber Bragg grating(FBG)technology embedded into a thermoplastic polyurethane filament using a 3-dimensional(3D)printer.Taking advantage of the flexibility and elastic properties of the thermoplastic polyurethane material,the embedding of the FBG provides durable protection with enhanced flexibility and sensitivity,as compared to the use of a bare FBG.Results of an evaluation of its performance have shown that the FBG sensors embedded in this way can be applied effectively in the measurement of strain,with an average wavelength responsivity of 0.0135 nm/cm of displacement for tensile strain and -0.0142 nm/cm for compressive strain,both showing a linearity value of up to 99%.Furthermore,such an embedded FBG-based strain sensor has a sensitivity of~1.74 times greater than that of a bare FBG used for strain measurement and is well protected and suitable for in-the-field use.It is also observed that the thermoplastic polyurethane based(TPU-based)FBG strain sensor carries a sensitivity value of~2.05 times higher than that of the polylactic acid based(PLA-based)FBG strain sensor proving that TPU material can be made as the material of choice as a“sensing”pad for the FBG. | Harith AHMAD Mohamad Ashraff ALIAS Mohammad Faizal ISMAIL Nor Najwa ISMAIL Muhammad Khairol Annuar ZAINI Kok Sing LIM Gilberto BRAMBILLA Kenneth T.V.GRATTAN B.MAzizur RAHMAN | 2022 | Photonic Sensors2022，12，3： | 0 |
| 17 | Generation of multi-wavelength erbium-doped fiber laser by using MoSe2 thin film as nonlinear medium and stabilizer显示文摘We experimentally demonstrate the application of MoSe2 thin film as a nonlinear medium and stabilizer to generate a multi-wavelength erbium-doped fiber laser. The cooperation of a photonic crystal fiber and a polari?zation-dependent isolator induces unstable multi-wavelength oscillations based on the nonlinear polarization rotation effect. A MoSe2 thin film is further incorporated into the cavity to achieve a stable multi-wavelength.The laser generates 7 lasings with a constant spacing of 0.47 nm at a pump power of 250 mW. The multi?wavelength erbium-doped fiber laser is stable with power fluctuations of less than 5 dB over 30 min. | Zian Cheak Tiu Harith Ahmad Arman Zarei Sulaiman Wadi Harun | 2016 | Chinese Optics Letters2016，14，4： | 0 |
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