The Experts below are selected from a list of 29529 Experts worldwide ranked by ideXlab platform
Daru Chen - One of the best experts on this subject based on the ideXlab platform.
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stable multi wavelength erbium doped Fiber laser based on a photonic crystal Fiber sagnac loop filter
Laser Physics Letters, 2007Co-Authors: Daru ChenAbstract:A multi-wavelength Erbium-Doped Fiber laser based on a Sagnac loop Fiber which is formed by a birefringent and highly nonlinear photonic crystal Fiber (PCF), a 3-dB optical coupler and two polariza ...
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switchable and tunable erbium doped Fiber ring laser incorporating a birefringent and highly nonlinear photonic crystal Fiber
Laser Physics Letters, 2007Co-Authors: Daru Chen, L ShenAbstract:A birefringent and highly nonlinear photonic crystal Fiber is employed in an Erbium doped Fiber ring laser, which can operate with dual-wavelength lasing or single-wavelength lasing. Both stable du ...
Jin U Kang - One of the best experts on this subject based on the ideXlab platform.
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c band wavelength swept single longitudinalmode erbium doped Fiber ring laser
Optics Express, 2008Co-Authors: Kang Zhang, Jin U KangAbstract:A wavelength-swept single-longitudinal-mode Erbium-Doped Fiber ring laser capable of operating at sweeping frequency in the order of a few kHz is designed and demonstrated by using a Fiber Fabry-Perot tunable filter and a Sagnac loop incorporated with a 3.5-meter unpumped Erbium-Doped Fiber. The laser operates in continuous-wave (CW) mode and can sweep approximately 45 nm over the entire C-band (1520nm-1570nm) window with linewidth less than 0.7 kHz. The optimum wavelength sweeping frequency in order to achieve the best output power stability was found to be approximately20Hz with sweeping-induced power fluctuation of only 0.1%.
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c band wavelength swept single longitudinalmode erbium doped Fiber ring laser
Optics Express, 2008Co-Authors: Kang Zhang, Jin U KangAbstract:A wavelength-swept single-longitudinal-mode Erbium-Doped Fiber ring laser capable of operating at sweeping frequency in the order of a few kHz is designed and demonstrated by using a Fiber Fabry-Perot tunable filter and a Sagnac loop incorporated with a 3.5-meter unpumped Erbium-Doped Fiber. The laser operates in continuous-wave (CW) mode and can sweep approximately 45 nm over the entire C-band (1520nm-1570nm) window with linewidth less than 0.7 kHz. The optimum wavelength sweeping frequency in order to achieve the best output power stability was found to be ~20Hz with sweeping-induced power fluctuation of only 0.1%.
Sulaiman Wadi Harun - One of the best experts on this subject based on the ideXlab platform.
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Enhanced triple-pass hybrid erbium doped Fiber amplifier using distribution pumping scheme in a dual-stage configuration
Optik, 2020Co-Authors: Aya A. Almukhtar, Harith Ahmad, X S Cheng, Alabbas A. Al-azzawi, P.h. Reddy, Anirban Dhar, Mukul Chandra Paul, Sulaiman Wadi HarunAbstract:Abstract An enhanced triple-pass hybrid optical Fiber amplifier in a dual-stage configuration is presented by utilizing a combination of hafnium-bismuth Erbium-Doped Fiber (HB-EDF) and bismuth Erbium-Doped Fiber (Bi-EDF) as gain medium. The total Erbium-Doped Fiber length was only 199 cm, and both HB-EDF and Bi-EDF were forward pumped by 1480 nm with an optimum pump power of 170 mW and 110 mW, respectively to provide flat gain and wideband amplification. At high input power of -10 dBm, a flat gain of about 19 dB with gain fluctuation of less than 2 dB was observed over wideband ranging from 1555–1600 nm. On the other hand, the noise figure varied from 4.8–9.3 dB within the flat gain region. The triple-pass Erbium-Doped Fiber amplifier has been enhanced by utilizing distribution pumping scheme in the configuration. This improvised configuration minimised the cost of the amplifier yet having the comparable performance with the dual-pump configuration. A flat gain of 17.2 dB with the corresponding noise figure below 8 dB was obtained within 1555–1600 nm.
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fwm based multi wavelength erbium doped Fiber laser using bi edf
Laser Physics, 2010Co-Authors: Harith Ahmad, R Parvizi, Kaharudin Dimyati, Mohamad Rom Tamjis, Sulaiman Wadi HarunAbstract:We experimentally demonstrate a simple structure but efficient multi-wavelength Erbium-Doped Fiber laser (EDFL) using a 49 cm Bismuth-based Erbium-Doped Fiber (Bi-EDF) as gain medium. The Bi-EDF provides erbium amplification and FWM effect in the cavity to generate a stable multi-wavelength comb operating in C-band region. We have achieved more than 5 lines with peak power of more than -35 dBm and channel spacing of 0.5 nm by incorporating a broadband Fiber Bragg grating and polarization controller in the ring cavity.
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wide band bismuth based erbium doped Fiber amplifier with a flat gain characteristic
IEEE Photonics Journal, 2009Co-Authors: X S Cheng, Harith Ahmad, R Parvizi, Sulaiman Wadi HarunAbstract:In this paper, a bismuth-based Erbium-Doped Fiber amplifier (Bi-EDFA) that operates in both the C- and L-band wavelength regions is demonstrated. The system employs two pieces of bismuth-based Erbium-Doped Fiber (Bi-EDF) as the gain medium with a midway broadband Fiber Bragg grating (FBG). The FBG functions to prevent the gain saturation at the C-band region, flatten the overall gain spectrum, and reduce the noise figure, particularly for the C-band. At an input signal power of $-$ 30 dBm and a pump power of 150 mW for both pumps, a flat gain of around 29 dB is obtained with a gain variation of $\pm$ 3.5 dB within the wavelength region from 1525 to 1615 nm using a backward-pumping scheme. At an input power of 0 dBm, the gain varies from 10 to 13 dB within the wavelength range from 1530 to 1620 nm, while the corresponding noise figure varies from 9.5 to 14 dB over this wavelength range.
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an efficient s band erbium doped Fiber amplifier using double pass configuration
IEICE Electronics Express, 2005Co-Authors: Sulaiman Wadi Harun, Nor Kamilah Saat, Harith AhmadAbstract:An efficient short wavelength band Erbium-Doped Fiber amplifier (S-band EDFA) is proposed and demonstrated using double-pass configuration. This amplifier provides a gain as high as 30dB, but using only 15m depressed cladding Erbium-Doped Fiber (EDF) and 130mW of 980nm pump power. Compared to the single-pass configuration, this amplifier shows a gain enhancement of about 14dB for pump powers above 120mW. However, noise figures penalties of about 0.5 ∼ 0.9dB are obtained for these pump powers. The proposed double-pass amplifier will play an important role in the development of a practical S-band EDFA from perspective of economical usage of EDF and pump power.
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gain clamping in l band erbium doped Fiber amplifier using a Fiber bragg grating
IEEE Photonics Technology Letters, 2002Co-Authors: Sulaiman Wadi Harun, S K Low, P Poopalan, Harith AhmadAbstract:A gain-clamping technique for the long wavelength band (L-band) Erbium-Doped Fiber amplifier (EDFA) is presented. It uses a single Fiber Bragg grating (FBG) on the input side of Erbium-Doped Fiber (EDF) to inject a portion of backward conventional band (C-band) amplified spontaneous emission (ASE) back into the system. The use of a narrow-band (NB) FBG has shown a better performance in clamped-gain level and noise figure compared to a broad-band FBG. The amplifier gain for the NB FBG set up is clamped at 15.4 dB with a variation of less than 0.3 dB for an input power as high as 0 dBm.
Shuisheng Jian - One of the best experts on this subject based on the ideXlab platform.
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tunable single polarization single longitudinal mode erbium doped Fiber ring laser employing a cmfbg filter and saturable absorber
Optics and Laser Technology, 2013Co-Authors: Suchun Feng, Shaohua Lu, Wanjing Peng, Qi Li, Ting Feng, Shuisheng JianAbstract:Abstract A tunable single-polarization single-longitudinal-mode (SLM) Erbium-Doped Fiber ring laser is proposed and demonstrated. For the first time as we know, a chirped moire Fiber Bragg grating (CMFBG) filter with ultra-narrow transmission band and a uniform Fiber Bragg grating (UFBG) are used to select the laser longitudinal mode. The stable SLM operation of the Fiber laser is guaranteed by the combination of the CMFBG filter and 3 m unpumped Erbium-Doped Fiber acting as a saturable absorber. The single polarization operation of the Fiber laser is obtained by using an inline broadband polarizer. A tuning range of about 0.7 nm with about 0.1 nm step is achieved by stretching the uniform FBG.
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switchable dual wavelength polarization maintaining erbium doped Fiber laser using an optical circulator as the all reflecting mirror
Optics and Laser Technology, 2010Co-Authors: Zhiming Liu, Peng Liu, Jingjing Zheng, Linyong Fan, Shuisheng JianAbstract:Abstract A simple and effective switchable dual-wavelength polarization-maintaining Erbium-Doped Fiber laser is proposed and demonstrated. Only using a uniform Fiber Bragg grating written directly in a segment of the photosensitive and polarization-maintaining Erbium-Doped Fiber as the wavelength selector and an optical circulator as the all-reflecting mirror, a stable simultaneous dual-wavelength oscillation is achieved with a wavelength spacing of 0.364 nm experimentally by exploiting the polarization hole burning effect at room temperature. The output can be switched between single- and dual-wavelength by adjusting the polarization controller. The 3-dB bandwidth and the side mode suppression ratio of the laser’s outputs are measured to be less than 0.01 nm and more than 50 dB. The power fluctuation and wavelength drift are measured to be less than 0.50 dB and 0.020 nm over an hour.
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single longitudinal mode erbium doped Fiber laser with multiple linear cavity
Photonics and Optoelectronics Meetings (POEM) 2008: Optoelectronic Devices and Integration, 2008Co-Authors: Suchun Feng, Wenhua Ren, Shuisheng JianAbstract:An improved stable single-longitudinal-mode (SLM) Erbium-Doped Fiber (EDF) laser with multiple-linear short cavity is demonstrated. Three Fiber Bragg gratings (FBGs) with the same parameters directly written in a homemade photosensitive EDF (PEDF) in a single step are used as the wavelength-selective and mode-selective component in a 14 cm long linear laser cavity. The optical signal-to-noise ratio (OSNR) is over 50 dB. The amplitude variation in nearly one hour is less than 0.3 dB. The proposed laser has the advantages such as simple fabrication and compact all-optical Fiber configuration.
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single polarization switchable dual wavelength erbium doped Fiber laser with two polarization maintaining Fiber bragg gratings
Optics Express, 2008Co-Authors: Suchun Feng, Tigang Ning, Ou Xu, Shaohua Lu, Xiangqiao Mao, Shuisheng JianAbstract:An improved Erbium-Doped Fiber laser configuration for achieving single-polarization, switchable dual-wavelength of orthogonal polarizations oscillations at room temperature is proposed. For the first time,two Fiber Bragg gratings (FBGs) directly written in a polarization-maintaining (PM) and photosensitive Erbium-Doped Fiber (PMPEDF) as the wavelength-selective component are used in a linear laser cavity. Due to the polarization hole burning (PHB) enhanced by the polarization-maintaining FBG (PMFBG), the laser can be designed to operate in stable dual-wavelength or wavelength-switching modes with a wavelength spacing of 0.336nm at room temperature by adjusting a polarization controller (PC). Each lasing line shows a single polarization with a polarization extinction ratio of >25dB under different pump levels. The optical signal-to-noise ratio (OSNR) is greater than 50 dB. The amplitude variation with 16 times scans in nearly one and half an hour is less than 0.5dB at both operating wavelength.
L.m. Zhao - One of the best experts on this subject based on the ideXlab platform.
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compact graphene mode locked wavelength tunable erbium doped Fiber lasers from all anomalous dispersion to all normal dispersion
Laser Physics Letters, 2010Co-Authors: Han Zhang, L.m. Zhao, Dingyuan Tang, Swee Chuan TjinAbstract:Soliton operation and soliton wavelength tuning of Erbium-Doped Fiber lasers mode locked with atomic layer graphene was experimentally investigated under various cavity dispersion conditions. It was shown that not only wide range soliton wavelength tuning but also soliton pulse width variation could be obtained in the Fiber lasers. Our results show that the graphene mode locked Erbium-Doped Fiber lasers provide a compact, user friendly and low cost wavelength tunable ultrashort pulse source.
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large energy mode locking of an erbium doped Fiber laser with atomic layer graphene
Optics Express, 2009Co-Authors: Han Zhang, Dingyuan Tang, L.m. ZhaoAbstract:We report on large energy pulse generation in an Erbium-Doped Fiber laser passively mode-locked with atomic layer graphene. Stable mode locked pulses with single pulse energy up to 7.3 nJ and pulse width of 415 fs have been directly generated from the laser. Our results show that atomic layer graphene could be a promising saturable absorber for large energy mode locking.
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dissipative soliton resonance in an all normal dispersion erbium doped Fiber laser
Optics Express, 2009Co-Authors: X Wu, Dingyuan Tang, Han Zhang, L.m. ZhaoAbstract:We report on the generation of 281.2 nJ mode locked pulses directly from an Erbium-Doped Fiber laser mode-locked with the nonlinear polarization rotation technique. We show that apart from the conventional dissipative soliton operation, an all-normal-dispersion Fiber laser can also emit square-profile dissipative solitons whose energy could increase to a very large value without pulse breaking.
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120 nm bandwidth noise like pulse generation in an erbium doped Fiber laser
Optics Communications, 2008Co-Authors: L.m. Zhao, D Y Tang, Teehiang Cheng, Hwayaw TamAbstract:We report on the generation of noise-like pulses with up to 120 nm bandwidth in a passively mode-locked Erbium-Doped Fiber ring laser. By inserting a segment of slightly normal dispersion Fiber in a mode-locked Fiber laser cavity, we found that the spectrum of the noise-like pulse emission of the laser can be significantly broadened as a result of the four-wave-mixing and the soliton self-frequency shift effects in the inserted Fiber.
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generation of 47 fs pulses directly from an erbium doped Fiber laser
Optics Letters, 2007Co-Authors: Dingyuan Tang, L.m. ZhaoAbstract:We show both numerically and experimentally that through appropriately selecting the output coupling position and strength in a mode-locked Fiber laser, one can effectively manage the nonlinearity of the cavity. By implementing the technique together with cavity dispersion management in an Erbium-Doped Fiber laser, we have achieved stable mode-locked pulses with a single-pulse energy of 2.08 nJ and pulse width of 46.2 fs directly from the laser.