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A Novel and Fast Model of Erbium-doped Fiber Amplifiers 被引量:4
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作者 ZHUZhi-peng JIANGFeng-xian 《Semiconductor Photonics and Technology》 CAS 2000年第1期1-7,共7页
A novel and fast model of erbium-doped fiber amplifiers (EDFAs) is presented. By calculating a typical EDFA, numerical results are compared with the results obtained by spectral-solved method. The results of compariso... A novel and fast model of erbium-doped fiber amplifiers (EDFAs) is presented. By calculating a typical EDFA, numerical results are compared with the results obtained by spectral-solved method. The results of comparison show that such a model can improve the computational speed and preserve the precision. Some characteristics of the EDFA are then analyzed using this model. The results are consistent with those of the experiments. 展开更多
关键词 erbium-doped fiber amplifier Rate equation Optical communications
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Analytical Studies on 980 nm Pumped Erbium-doped Fiber Amplifiers
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作者 XIAGuangqiong CHENJIanguo 《Semiconductor Photonics and Technology》 CAS 1996年第1期14-17,共4页
Modeled with a three-level-atom appropriate to 980 nm pumped amplifiers,analytical solutions have been deduced for the rate equations of erbium-doped fiber amplifiers.Various key parameters of the amplifiers have been... Modeled with a three-level-atom appropriate to 980 nm pumped amplifiers,analytical solutions have been deduced for the rate equations of erbium-doped fiber amplifiers.Various key parameters of the amplifiers have been specified. 展开更多
关键词 erbium-doped fiber amplifier Soliton Transmission Rate Equation
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A novel 3-stage structure for a low-noise, high-gain and gain-flattened L-band erbium doped fiber amplifier
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作者 强则煊 何赛灵 +1 位作者 张徐亮 沈林放 《Journal of Zhejiang University Science》 CSCD 2004年第9期1130-1134,共5页
The configuration of the novel three-stage L-band erbium-doped fiber amplifier with very large and flat gain and very low noise figure presented in this paper uses the forward ASE (amplified spontaneous emission) from... The configuration of the novel three-stage L-band erbium-doped fiber amplifier with very large and flat gain and very low noise figure presented in this paper uses the forward ASE (amplified spontaneous emission) from the first section of the EDF (erbium-doped fiber) and the backward ASE from the third section of the EDF (both serve as the secondary pump sources of energy) to pump the second EDF. To improve the pump efficiency, the power of the pump is split into two parts (with a ratio of e.g. 2:7). The characteristics of this L-band EDFA are studied on the basis of the Giles Model with ASE. 展开更多
关键词 Erbium doped fiber amplifier Three-stage Pump l-band fiber optical communication
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Modeling of cascaded high isolation bidirectional amplification in long-distance fiber-optic time and frequency synchronization system 被引量:1
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作者 Kuan-Lin Mu Xing Chen +2 位作者 Zheng-Kang Wang Yao-Jun Qiao Song Yu 《Chinese Physics B》 SCIE EI CAS CSCD 2021年第7期294-302,共9页
We propose a physical model of estimating noise and asymmetry brought by high isolation Bi-directional erbiumdoped fiber amplifiers(Bi-EDFAs),no spontaneous lasing even with high gain,in longdistance fiber-optic time ... We propose a physical model of estimating noise and asymmetry brought by high isolation Bi-directional erbiumdoped fiber amplifiers(Bi-EDFAs),no spontaneous lasing even with high gain,in longdistance fiber-optic time and frequency(T/F)synchronization system.It is found that the Rayleigh scattering noise can be suppressed due to the high isolation design,but the amplified spontaneous emission(ASE)noise generated by the high isolation Bi-EDFA and the bidirectional asymmetry of the transmission link caused by the high isolation Bi-EDFA will deteriorate the stability of the system.The calculated results show that under the influence of ASE noise,the frequency instability of a 1200 km system composed of 15 high isolation Bi-EDFAs is 1.773×10^(-13)/1 s.And the instability caused by asymmetry is 2.6064×10^(-16)/30000–35000 s if the total asymmetric length of the bidirectional link length is 30 m.The intensity noises originating from the laser and detector,the transfer delay fluctuations caused by the variation in ambient temperature and the jitter in laser output wavelength are also studied.The experiment composed of three high isolation Bi-EDFAs is done to confirm the theoretical analysis.In summary,the paper shows that the short-term instability of the T/F synchronization system composed of high isolation Bi-EDFAs is limited by the accumulation of ASE noise of amplifiers and the laser frequency drift,while the long-term instability is limited by the periodic variation in ambient temperature and the asymmetry of the amplifiers.The research results are useful for pointing out the direction to improve the stability of the fiber-optic T/F synchronization system. 展开更多
关键词 time and frequency synchronization erbium-doped fiber amplifier INSTABILITY Allan deviation
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Channel Pre-emphasis Equalization for a 270km 40×40 Gbit/s WDM System with Cascaded EDFAs/Raman Amplifiers
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作者 杨爱英 孙雨南 《Journal of Beijing Institute of Technology》 EI CAS 2008年第3期330-334,共5页
Optical channel pre-emphasis equalization is experimentally researched for a 270 km 40 × 40 Gbit/s wavelength division multiplexing (WDM) transmission system with three Erbium-doped fiber amplifiers (ED- FAs)... Optical channel pre-emphasis equalization is experimentally researched for a 270 km 40 × 40 Gbit/s wavelength division multiplexing (WDM) transmission system with three Erbium-doped fiber amplifiers (ED- FAs) and Raman amplifiers concatenated as booster amplifier. The channel imbalance of the overall system changes with different sets of power launched into EDFAs. By appropriately choosing the power input to concatenated EDFAs, the output spectrum of 40 channel signal can be equalized to the most extent. The merit of benefit can be around 5.5 dB by this pre-emphasis equalization. The requirement for the gain equalizer is therefore greatly released. Then the gain imbalance of the overall system and the power imbalance of 40 channels are compared and the two almost matches, but the significant difference lies on some channels. Finally, the pump power into Raman amplifier is also optimized, and another 1.3 dB improvement of channel equaliza- tion can be further achieved. 展开更多
关键词 wavelength division multiplexing (WDM) erbium-doped fiber amplifier (EDFA) channel im-balance optical signal to noise ratio gain equalizer
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All-fiber linear polarization and orbital angular momentum modes amplifier based on few-mode erbium-doped fiber and long period fiber grating 被引量:2
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作者 Jianfei Xing Jianxiang Wen +4 位作者 Jie Wang Fufei Pang Zhenyi Chen Yunqi Liu Wingyun Wang 《Chinese Optics Letters》 SCIE EI CAS CSCD 2018年第10期14-17,共4页
A few-mode erbium-doped fiber(FM-EDF) is fabricated using modified chemical vapor deposition in combination with liquid solution. The core and cladding diameters of the fiber are approximately 19.44 and 124.12 μm,r... A few-mode erbium-doped fiber(FM-EDF) is fabricated using modified chemical vapor deposition in combination with liquid solution. The core and cladding diameters of the fiber are approximately 19.44 and 124.12 μm,respectively. The refractive index difference is 0.98%, numerical aperture(NA) is 0.17, and normalized cut-off frequency at 1550 nm is 6.81. Therefore, it is a five-mode fiber, and can be used as a higher-order mode gain medium. Furthermore, a long period fiber grating(LPFG) is fabricated, which can convert LP〈01 mode to LP11 mode, and its conversion efficiency is up to 99%. The first-order orbital angular momentum(OAM) is also generated by combining the LPFG and polarization controller(PC). Then, an all-fiber amplification system based on the FM-EDF and LPFG, for LP11 mode and first-order OAM beams, is built up. Its on-off gain of the LP11 mode beam is 37.2 d B at 1521.2 nm. The variation, whose transverse mode field intensity of first-order OAM is increased with the increase of pumping power, is obvious. These show that both the LP11 mode and first-order OAM beams are amplified in the all-fiber amplification system. This is a novel all-fiber amplification scheme,which can be used in the optical communication fields. 展开更多
关键词 EDF All-fiber linear polarization and orbital angular momentum modes amplifier based on few-mode erbium-doped fiber and long period fiber grating OAM
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Gain performances of 980 nm-pumped erbium-doped fiber amplifiers
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作者 杜戈果 陈国夫 《Science China Mathematics》 SCIE 1999年第3期286-292,共7页
Through the introduction of the overlapping factors between the light (pump and signal) intensities and the erbium doping distributions inside the fiber core, analytical solutions of homogeneously broadened two-level ... Through the introduction of the overlapping factors between the light (pump and signal) intensities and the erbium doping distributions inside the fiber core, analytical solutions of homogeneously broadened two-level systems for erbium-doped fiber amplifiers pumped in the 980 nm absorption band have been derived from EDFA rate equations and light propagation equations in steady-state case. By using these deduced expressions and numerical simulated methods, important features characterizing the amplifiers such as gain, pump threshold power, optimum fiber length have been analyzed and discussed. 展开更多
关键词 erbium-doped fiber amplifier rate EQUATION gain.
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Doping radius effects on an erbium-doped fiber amplifier
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作者 Ziaul Amin Khurram Karim Qureshi Mahbub Hossain 《Chinese Optics Letters》 SCIE EI CAS CSCD 2019年第1期14-19,共6页
In an erbium-doped fiber amplifier(EDFA), erbium ions act as a three-level system. Therefore, much higher pump energy is required to achieve the population inversion in an erbium-doped fiber(EDF). This higher pump ene... In an erbium-doped fiber amplifier(EDFA), erbium ions act as a three-level system. Therefore, much higher pump energy is required to achieve the population inversion in an erbium-doped fiber(EDF). This higher pump energy requirement complicates the efficient design of an EDFA. However, efficient use of the pump power can improve the EDFA performance. The improved performance of an EDFA can be obtained by reducing the doping radius of the EDF. A smaller doping radius increases pump–dopant interactions and subsequently increases the pump–photon conversion efficiency. Decreasing the doping radius allows a larger proportion of dopant ions,which are concentrated near the core, to interact with the highest pump intensity. However, decreasing the doping radius beyond a certain limit will bring the dopant ions much closer and introduce detrimental ion–ion interaction effects. In this Letter, we show that an optimal doping radius in an EDF can provide the best gain performance. Moreover, we have simulated the well-known numerical aperture effects on EDFA gain performance to support our claim. 展开更多
关键词 DOPING RADIUS EFFECTS erbium-doped fiber amplifier
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In-band intermodulation induced by transient response of erbium-doped fiber amplifier
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作者 Guanghao Shao Xingwei Ye +3 位作者 Guoqiang Zhang Yuqi Tan Jiquan Zhai Yuhao Yang 《Chinese Optics Letters》 SCIE EI CAS CSCD 2022年第1期192-197,共6页
Transient response of an erbium-doped fiber amplifier(EDFA) is studied in an externally-modulated analog link.Double tones represented as transmitted radio frequency and dither signals are introduced.Extra modulation ... Transient response of an erbium-doped fiber amplifier(EDFA) is studied in an externally-modulated analog link.Double tones represented as transmitted radio frequency and dither signals are introduced.Extra modulation is generated owing to the EDFA’s transient response caused by a low-frequency dither signal.Therefore,the parasitic modulation is superposed to the output signals and may significantly affect in-band electrical spectra.Analytical and numerical solutions are both given,which agree well with experimental results.This work indicates that a suitable dither signal should be selected to maximize the carrier to intermodulation ratio.In-band spurious free dynamic range is optimized in the meantime. 展开更多
关键词 erbium-doped fiber amplifier transient response dither signal carrier to intermodulation ratio externally-modulated analog link
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Amplification and Compression of Ultrashort Fundamental Solitons in An Erbium-Doped Nonlinear Amplifying Fiber Loop Mirror 被引量:14
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作者 P. K. A. Wai 《光学学报》 EI CAS CSCD 北大核心 2003年第S1期393-394,共2页
A nonlinear amplifying loop mirror constructed from erbium-doped fiber is proposed for simultaneous amplification and compression of ultrashort fundamental solitons. Numerical simulations show that, the proposed devic... A nonlinear amplifying loop mirror constructed from erbium-doped fiber is proposed for simultaneous amplification and compression of ultrashort fundamental solitons. Numerical simulations show that, the proposed device performs efficient high-quality amplification and compression of solitons. 展开更多
关键词 of length that for amplification and Compression of Ultrashort Fundamental Solitons in An erbium-doped Nonlinear Amplifying fiber Loop Mirror in
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A High Power Conversion Efficiency L-Band Erbium Doped Fiber Amplifier
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作者 Z.G. Lu C.P. Grover 《光学学报》 EI CAS CSCD 北大核心 2003年第S1期383-384,共2页
By using two sections of erbium doped fiber and a fiber optical reflector, a novel, highly efficient L-band amplifier is demonstrated with significantly power-conversion-efficiency enhancement and the gain increasing ... By using two sections of erbium doped fiber and a fiber optical reflector, a novel, highly efficient L-band amplifier is demonstrated with significantly power-conversion-efficiency enhancement and the gain increasing of as much as 13 dB. 展开更多
关键词 EDFA as of LENGTH high with A High Power Conversion Efficiency l-band Erbium Doped fiber amplifier ASE been for
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A Low Noise L-band Dispersion-Compensating Hybrid Fiber Amplifier with 1500 nm Raman Pumping
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作者 Hee Sang Chung Wonkyoung Lee Moo-Jung Chu 《光学学报》 EI CAS CSCD 北大核心 2003年第S1期411-412,共2页
This report presents a low noise L-band dispersion-compensating hybrid fiber amplifier with 1500-nm Raman pumping. It describes the pre-stage optimization, Raman pump selection, and possible nonlinearity problems to a... This report presents a low noise L-band dispersion-compensating hybrid fiber amplifier with 1500-nm Raman pumping. It describes the pre-stage optimization, Raman pump selection, and possible nonlinearity problems to achieve a practical low noise L-band optical amplifier. 展开更多
关键词 NM in be of length A Low Noise l-band Dispersion-Compensating Hybrid fiber amplifier with 1500 nm Raman Pumping dBm EDF with NF
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Mode-dependent dynamic gain of all-fiber FM-EDFA under various pump manipulation
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作者 方翼鸿 张心怡 +5 位作者 黄锡恒 曾研 许鸥 李建平 付松年 秦玉文 《Chinese Optics Letters》 SCIE EI CAS CSCD 2024年第2期128-134,共7页
The dynamic gain of a few-mode erbium-doped fiber amplifier(FM-EDFA)is vital for the long-haul mode division multiplexing(MDM)transmission.Here,we investigate the mode-dependent dynamic gain of an FM-EDFA under variou... The dynamic gain of a few-mode erbium-doped fiber amplifier(FM-EDFA)is vital for the long-haul mode division multiplexing(MDM)transmission.Here,we investigate the mode-dependent dynamic gain of an FM-EDFA under various manipulations of the pump mode.First,we numerically calculate the gain variation with respect to the input signal power,where a modedependent saturation input power occurs under different pump modes.Even under the fixed intensity profile of the pump laser,the saturation input power of each spatial mode is different.Moreover,high-order mode pumping leads to a compression of the linear amplification region,even though it is beneficial for the mitigation of the differential modal gain(DMG)arising in all guided modes.Then,we develop an all-fiber 3-mode EDFA,where the fundamental mode of the pump laser can be efficiently converted to the LP_(11)mode using the all-fiber mode-selective coupler(MSC).In comparison with the traditional LP_(01)pumping scheme,the DMG at 1550 nm can be mitigated from 1.61 dB to 0.97 dB under the LP_(11)mode pumping,while both an average gain of 19.93 dB and a DMG of less than 1 dB can be achieved from 1530 nm to 1560 nm.However,the corresponding signal input saturation powers are reduced by 0.3 dB for the LP_(01)mode and 1.6 dB for the LP_(11)mode,respectively.Both theoretical and experimental results indicate that a trade-off occurs between the DMG mitigation and the extension of the linear amplification range when the intensity profile of pump laser is manipulated. 展开更多
关键词 few-mode erbium-doped fiber amplifier differential modal gain saturation input power
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FRA/EDFA组合放大+DCF补偿的超长距离1550nm SCM光纤传输系统(上)
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作者 宋英雄 林如俭 +1 位作者 王丰 丁姗姗 《有线电视技术》 2008年第8期58-61,68,共5页
随着中国广电网络规模的扩大及向运营级网络的发展,出现了有线电视大范围(地市级)联网的需求。这种需求对副载波复用电视光纤传输系统提出了新的挑战和要求。本文对1550nm超干线进行了理论、仿真和实验研究,重点研究了长达570km的数字... 随着中国广电网络规模的扩大及向运营级网络的发展,出现了有线电视大范围(地市级)联网的需求。这种需求对副载波复用电视光纤传输系统提出了新的挑战和要求。本文对1550nm超干线进行了理论、仿真和实验研究,重点研究了长达570km的数字电视射频光纤传输所面对的调制误差比(MER)及组合二阶互调(CSO)劣化补偿技术。在跨距长达100~130km的情况下,探讨了采用组合受激喇曼/掺铒光纤放大器+色散补偿光纤(DCF)改善MER与CSO指标的技术原理和可行性,推导了DCF最佳色散量的计算公式。实验测试映证了理论结果的正确性。。 展开更多
关键词 色散补偿(fiber DISPERSION Compensation) 自相位调制(Self-PhaseModulation) 非线性(Nonlinearity) 组合二次互调(CSO)色散补偿光纤(Dispersion COMPENSATION fiber) 喇曼光纤放大器(Raman fiber amplifier) 掺铒光纤放大器(erbium-doped fiber amplifier)
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Recent Advances in Long-distance FBG Sensor Systems at UESTC 被引量:2
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作者 饶云江 冉曾令 《Journal of Electronic Science and Technology of China》 2006年第3期232-236,共5页
Recent progress in long-distance in-Fiber Bragg Grating (FBG) sensor systems at University of Electronic Science & Technology of China (UESTC) is reviewed in this paper. Two novel approaches with a 50km transmiss... Recent progress in long-distance in-Fiber Bragg Grating (FBG) sensor systems at University of Electronic Science & Technology of China (UESTC) is reviewed in this paper. Two novel approaches with a 50km transmission distance are proposed and demonstrated. The first one is based on the combination of bidirectional Raman amplification and a dual Erbium-Doped Fiber (EDF) configuration. A good Signal-to-Noise Ratio (SNR) of ~16dB is achieved with only a pump power of ~280 mW, which is ~10 dB higher than that without amplification. The second is based on a novel tunable fiber ring laser configuration with hybrid Raman/EDFA configuration. Experimental results show that an excellent optical SNR of-~60 dB has been achieved for a 50 km transmission distance with a low Raman pump power of ~170 mW and a low EDFA pump power of~40 mW at wavelength of 980 nm. It is anticipated that these long-distance FBG sensing systems could find important applications in health monitoring of large infra-structures, such as oil or gas pipelines, ultra-long bridges and tunnels, river banks, and so on. 展开更多
关键词 optic fiber sensors fiber Bragg grating sensors fiber ring lasers Ramanamplification erbium-doped fiber amplifiers.
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Comparative Assessment on the Performance of Open-Loop and Closed-Loop IFOGs
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作者 Mohammad Reza Nasiri-Avanaki Vahid Soleimani Rohollah Mazrae-Khoshki 《Optics and Photonics Journal》 2012年第1期17-29,共13页
In this paper, we evaluated comprehensively the structure and operation of open-loop interferometric optical fiber gyroscopes (IFOG). To complete the previous works, a digital approach to derive the rotation angle in ... In this paper, we evaluated comprehensively the structure and operation of open-loop interferometric optical fiber gyroscopes (IFOG). To complete the previous works, a digital approach to derive the rotation angle in optical fiber gyroscopes is investigated theoretically. Results are simulated by the MATLAB software;therefore we could compare the results in simulated area with the values derived from theory. Also, feedback Erbium-doped fiber amplifier (EFDA) FOGs, called FE-FOG, is categorized in closed-loop IFOGs. The procedure of finding the Sagnac shift for open-loop and closed-loop IFOG have been studied and compared to one another. The signal processing in the open-loop IFOG was simulated using Matlab software and for the closed-loop IFOG by PSCAD. In the open-loop IFOG the analogue formulation of the IFOG in order to extract the phase shift is analyzed. A novel and promising method for derivation of Sagnac phase shift based on digital finite impulse response filtering is proposed. Based on our simulation results, the reliability and accuracy of the method is determined. In the closed-loop IFOG, the shift was derived through frequent use of Sagnac loop. The output signal is injected in the input again as feedback. The shift phase between clockwise and counterclockwise waves in each complete route, including primary and feedback route, is identified as Sagnac shift phase. 展开更多
关键词 Feedback erbium-doped fiber amplifier FOG (FE-FOG) erbium-doped fiber amplifier (EFDA) DIGITAL Signal Processing PSCAD FIR DIGITAL Filters Interferometric fiber Optic Gyro (IFOG) Sagnac Shift
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Tunable Multi Wavelength by Pulse Signal Modulation in Laser Pumping of EDFA
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作者 Poramate Chunpang Seckson Sukhasen 《Journal of Modern Physics》 2015年第5期521-525,共5页
This report is aimed to present the result of experimental setup of the erbium-doped fiber amplifier (EDFA) with modulated pulse signal by laser pumping at wavelength 980 nm. The amplified spontaneous emission (ASE) f... This report is aimed to present the result of experimental setup of the erbium-doped fiber amplifier (EDFA) with modulated pulse signal by laser pumping at wavelength 980 nm. The amplified spontaneous emission (ASE) from EDFA has multi wavelength and the spacing of wavelength can be controlled by controlling the pulse width of laser pumping. The result in this experiment shows that the feasibility of using EDFA system can generate the multi wavelength of all of C-Band spectrum. The pulse signal, for modulated laser pumping, is observed ranging from 10 to 100 Hz and the wavelength spacing can be tuned from 14.7 nm to 14.9 nm. 展开更多
关键词 erbium-doped fiber amplifier (EDFA) WDM MULTI WAVELENGTH Laser
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Experiments and simulation on the overall DMG of long-haul cascade FM-EDFA systems
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作者 江歆睿 武保剑 +2 位作者 严伟 文峰 邱昆 《Chinese Optics Letters》 SCIE EI CAS CSCD 2024年第4期53-59,共7页
All-fiber few-mode erbium-doped fiber amplifiers(FM-EDFAs) with isolation and wavelength division multiplexers(IWDMs)have been developed to enable flexible pumping in different directions. The FM-EDFA can achieve >... All-fiber few-mode erbium-doped fiber amplifiers(FM-EDFAs) with isolation and wavelength division multiplexers(IWDMs)have been developed to enable flexible pumping in different directions. The FM-EDFA can achieve >30 d B modal gain with<0.3 d B differential modal gain(DMG). We experimentally simulate the DMG performance of a cascade FM-EDFA system using the equivalent spectrum method. The overall DMG reaches 1.84 d B after 10-stage amplification. We also build a recirculating loop to simulate the system, and the developed FM-EDFA can support transmission up to 3270 km within a 2 d B overall DMG by optimizing the few-mode fiber length in the loop. 展开更多
关键词 mode division multiplexing few-mode erbium-doped fiber amplifier gain equalization
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Differential mode-gain equalization via femtosecond laser micromachining-induced refractive index tailoring
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作者 Cong Zhang Senyu Zhang +5 位作者 Yan Zeng Yue Wang Meng Xiang Di Lin Songnian Fu Yuwen Qin 《Light(Advanced Manufacturing)》 2024年第2期24-32,共9页
The mode-division multiplexing technique combined with a few-mode erbium-doped fiber amplifier(FM-EDFA)demonstrates significant potential for solving the capacity limitation of standard single-mode fiber(SSMF)transmis... The mode-division multiplexing technique combined with a few-mode erbium-doped fiber amplifier(FM-EDFA)demonstrates significant potential for solving the capacity limitation of standard single-mode fiber(SSMF)transmission systems.However,the differential mode gain(DMG)arising in the FM-EDFA fundamentally limits its transmission capacity and length.Herein,an innovative DMG equalization strategy using femtosecond laser micromachining to adjust the refractive index(RI)is presented.Variable mode-dependent attenuations can be achieved according to the DMG profile of the FM-EDFA,enabling DMG equalization.To validate the proposed strategy,DMG equalization of the commonly used FM-EDFA configuration was investigated.Simulation results revealed that by optimizing both the length and RI modulation depth of the femtosecond laser-tailoring area,the maximum DMG(DMGmax)among the 3 linear-polarized(LP)mode-group was mitigated from 10 dB to 1.52 dB,whereas the average DMG(DMGave)over the C-band was reduced from 8.95 dB to 0.78 dB.Finally,a 2-LP mode-group DMG equalizer was experimentally demonstrated,resulting in a reduction of the DMGmax from 2.09 dB to 0.46 dB,and a reduction of DMGave over the C band from 1.64 dB to 0.26 dB,with only a 1.8 dB insertion loss.Moreover,a maximum range of variable DMG equalization was achieved with 5.4 dB,satisfying the requirements of the most commonly used 2-LP mode-group amplification scenarios. 展开更多
关键词 Mode-division multiplexing Few-mode erbium-doped fiber amplifier Differential mode gain Femtosecond laser micromachining
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Novelty Design in Gain Flattening Filter of ASE Source Based on Fat Ultra-Long Period Fiber Grating 被引量:1
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作者 Fereshteh Mohammadi NAFCHI Sharifeh SHAHI +2 位作者 Mohammad Taha SHAFFAATIFAR Mohammad KANANI Hossein NOORMOHAMMADI 《Photonic Sensors》 SCIE EI CAS CSCD 2016年第3期243-248,共6页
A new type of gain flattening filter for amplified spontaneous emission (ASE) source based on erbium doped fiber (EDF) is proposed and demonstrated by fabricating and writing two series ultra-long period fiber gra... A new type of gain flattening filter for amplified spontaneous emission (ASE) source based on erbium doped fiber (EDF) is proposed and demonstrated by fabricating and writing two series ultra-long period fiber grating (ULPFG) on single mode fiber (SMF-28). The novelty method in this research is based on writing the two ULPFGs as fat gratings. The LPG is written by a simple and available arc-discharge method. The pump power based on single-pass backward pump configuration is around 100mW, and the average wavelength is near to 974nm. The gain flattening profile is obtained by 3.4 (±1.7)dB ripple in the wavelength range between 1524nm and 1565nm with 41-nm band width. 展开更多
关键词 amplified spontaneous emission (ASE) source erbium-doped fiber amplifier (EDFA) gain flatteningfilter long-period fiber grating (LPFG)
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