光纤陀螺用掺铒超荧光光纤光源输出特性研究

介绍了掺铒超荧光光纤光源(SFS)的基本原理和SFS各种基本结构的特点。结合实际应用选择了单程后向(SPB) SFS作为光纤陀螺用光源。理论分析了影响单程后向掺铒超荧光光纤光源输出特性的各种因素。通过实验分析了铒纤长度对单程后向掺铒光纤光源泵浦效率和输出光谱的影响,特别是对中心波长稳定性的影响,对于单程后向结构掺铒光纤光源来说,铒纤长度有一个最佳值。演示了铒纤在选择最佳长度的情况下,泵浦功率对输出谱型的影响。通过实验分析了-40℃～60℃之间光源输出光谱和输出光功率的温度稳定性。最终得到了适用于惯导级光纤陀螺的光源。     

芯泵浦高功率宽带谱平坦长波段光纤光源

为了获得高功率、宽带宽及谱平坦的长波段掺铒光纤光源,基于2级双程芯泵浦,应用偏振复用技术实现泵浦瓦级供给,在泵浦总功率和光纤总长度都不变的情况下,数值分析了4种光源结构的输出特性受泵浦和光纤分配比例的影响。结果表明,4种结构基本都能工作于L波段（1 565 nm~1 610 nm）,带宽受结构影响较小,但只有双程后向+双程后向结构可同时拥有高输出功率和高平坦度。其在总泵浦功率750 mW,第一级泵浦功率为300 mW,第二级泵浦功率为450 mW时,和光纤总长度21 m,第一级光纤长度为18 m,第二级光纤长度为3 m时,可实现输出功率314 mW,带宽32.41 nm,中心波长1 584.84 nm,平坦度2.23 dB的L波段超荧光光源。     

Broadband Er-Yb co-doped superfluorescent fiber source

In this paper, extensive experimental results on broad-band double cladding Er³⁺-Yb³⁺ co-doped superfluorescent fiber sources (SFSs), characterizing their output power, mean wavelength, and bandwidth (BW) stability with variations of pump power, pump wavelength, and fiber temperature, have been reported. For a 55-cm fiber, SFS power from 3.7755 (maximum BW condition of more than 80 nm) to 9.1837 mW (maximum power condition, BW is about 34 nm) has been achieved. The SFS mean wavelength dependence on pump wavelength is highly pump temperature sensitive, and can be reduced to zero in a chosen pump temperature field. The intrinsic variation of the SFS mean wavelength λ_m with fiber temperature is also measured, and a linear variation from 15 to 45 °C with a slop of −0.053 nm/°C for L_f = 100 cm and −0.04 nm/°C for L_f = 55 cm is found.     

Transmitting spectra-temperature characteristic of single-mode fiber coupler for fiber gyro application

The relationship between the transmitting spectra characteristic of a fused single mode fiber coupler (SMFC) and the performance of interferometric fiber-optic gyroscope (IFOG) is analyzed in theory firstly. Then the transmitting spectra-temperature characteristic of SMFC is experimented, and the influence of the spectrum-stability of the SMFC on IFOG is simulated and experimented. Through the theory analysis and experiment research, it is confirmed that the spectrum output from the SMFC's throughput port is more stable than that output from the coupled port, and the bias instability of the rotation errors induced by the variation of spectrum output from the SMFC's coupled port is 10 times of that output from the throughput port. Therefore, to choose the SMFC's throughput port as the input port for navigation-grade gyroscope is an effective method to improve the IFOG's performance.     

基于色散调谐宽带扫频光纤激光器及其在光纤光栅解调中的应用

报道了一种基于色散调谐技术的宽带扫频掺铒光纤激光器。通过在主动锁模光纤激光器腔内引入较大色散,利用锯齿波电信号调制电光调制器的调制频率,可以实现激光器扫频输出。应用扫频激光器可将光纤光栅反射中心波长的变化转变为时域上信号间隔变化,适用于光纤光栅传感解调。搭建了扫频光纤激光器,利用掺铒光纤作为增益介质,研究了扫频范围的影响因素。通过优化实验参数,实验得到的扫频带宽达到43 nm,接近增益带宽,扫频速度为50 Hz。利用搭建的扫频激光器进行了光纤光栅传感解调,灵敏度约为0.68 ms/nm,验证了解调原理。     

Radiation-induced attenuation self-compensating effect in super-fluorescent fiber source

The compact super-fluorescent fiber source(SFS) output spectra variations at different pump currents and under different dose of gamma-ray radiation were measured and compared respectively. The radiation-induced attenuation(RIA)self-compensating effect in SFS based on photo-bleaching was found and the general mathematic model of SFS output spectra variations was made. The radiation-induced background attenuation(RIBA) at the pump wavelength was identified to be the main cause of the total output power and spectra variations and the variations can then be compensated by active control of the pump power to enhance the self-compensating effect. With closed-loop feedback control of pump current,double-pass backward(DPB) configuration and spectrum re-shaping technology, an SFS prototype was made and tested.The mean-wavelength stability of about 87.4 ppm and output power instability of less than 5% were achieved under up to200 krad(Si) gamma-ray irradiation.     

Tunable dual-wavelength fiber laser based on a single fiber Bragg grating in a Sagnac loop interferometer

We propose a simple dual-wavelength Er-doped fiber laser configuration based on a dual-wavelength fiber Bragg grating written on the splice joint between two different fibers for wavelength-selective filter in the Sagnac loop interferometer. The wavelength separation between the adjacent lasing wavelengths is 1.12 nm and the side-mode suppression ratio (SMSR) is over 55 dB. The output power variation is less than 0.8 dB over a two-minute period. Moreover, the lasing wavelength can be effectively tuned using the thermal heating method.     

2 W Yb-doped double-clad fiber superfluorescent source with 42 nm 3 dB bandwidth

The output spectrum of Yb-doped double-clad fiber superfluorescent source (SFS) is tailored by placing a broadband dichroic mirror in the pump end of conventional single-pass forward configuration, which constitutes double-pass forward configuration. The 3 dB bandwidth is increased from 11 to 42 nm. A maximum output SFS power of 2.12 W and a slope efficiency of 43.2% are obtained. The double-clad fiber is 25 m and the pump power is adequate to saturate the fiber as far as the feedback-induced lasing appears.     

A global design of an erbium-doped fiber and an erbium-doped fiber amplifier

A global design of an erbium-doped fiber and an open-loop erbium-doped fiber amplifier (EDFA) in a steady-state operation is discussed by applying genetic algorithms. Taking a signal gain and a bandwidth as objective functions, 7 parameters of the EDFA (erbium concentration, core radius, erbium-doped radius, refractive index difference, fiber length, pumping wavelength and signal power) are optimized by solving optical propagation equations, assuming a homogenous two-level active medium and a single-mode propagation. There is evidence to show that the 1480 nm pump utilized in usual EDFAs is not an optimal choice, which should be chosen around 1460 nm. The optimal core radius ranges 0.465–0.548 μm on pumping power 50–200 mW. Under different design objects and with different pumping powers, however, there are different optimal Er-doped concentrations, reflective index differences and fiber lengths. As a single fiber EDFA, 35 dB signal gain or 35 nm bandwidth is obtained with the 7 optimal parameters, 100 mW pumping power and 0.001 mW input signal power.     

L波段高掺铒光纤超荧光光源

采用半导体激光二极管泵浦12cm长高掺铒光纤,在双程前向装置中,获得了10.8mW最大超荧光输出功率,斜率效率10.6%,在1553.1~1588.6nm接近36nm的范围内,功率抖动小于0.2dBm。作为比较,在相同实验条件下泵浦10cm长的高掺铒光纤,结果显示输出光谱带宽明显下降,C波段的放大自发辐射远大于L波段的,由此也证明了L波段的放大自发辐射是由C波段的放大自发辐射泵浦产生的。     

High-stable,double-pass forward superfluorescent fiber source based on erbium-doped photonic crystal fiber

A double-pass forward configuration superfluorescent fiber source (SFS) based on erbium-doped photonic crystal fiber (EDPCF) with a high intrinsic mean wavelength stability is presented. The main factors of SFS instability with temperature variation are analyzed. Optimization of the high-stable SFS is achieved by combining high-performance EDPCF, optimal fiber length, and source structure with fine-tuning pump power. The temperature dependence of the SFS mean wavelength has been reduced to below 0.077 ppm/°C with temperature variation from 70 to ?40 °C. To the best of our knowledge, this value is the closest to 0 ppm/°C in the reported references, and these new developments probably constitute an important step for high-accuracy interferometric fiber-optic gyroscope sources.     

铒纤长度对单程掺铒光源输出特性的影响

 分析铒纤长度对掺铒光源输出特性的影响对于光源的优化设计有重要意义。实验分析了铒纤长度对单程前向和后向掺铒光纤光源(SFS)输出特性的影响。分析了铒纤长度与单程SFS输出光功率的关系,以及铒纤长度对单程SFS输出光谱宽度及中心波长的影响。找到了最佳铒纤长度的范围,对单程掺铒光纤光源的器件选择及性能优化有重要的参考价值。     

基于少数层石墨烯可饱和吸收的锁模光纤激光器

本文利用化学气相沉积法高温分解甲烷在铜箔上制得单层石墨烯薄膜, 测量了石墨烯的拉曼光谱. 将石墨烯薄膜逐层转移到光纤跳线的氧化锆插芯端面上做成可饱和吸收材料, 实验研究了环形腔掺铒光纤脉冲激光器的输出特性, 获得了峰值波长为1560.1 nm, 3 dB带宽为0.27 nm, 重复频率为7.69 MHz, 脉冲宽度为58.8 ps 的锁模脉冲序列. 时间带宽积为1.98, 表明脉冲出现了啁啾. 最后, 通过改变两个光纤活动接头之间的空气腔的长度, 激光波长实现了4 nm的调谐. 关键词： 光纤激光器 石墨烯 锁模     

高稳定宽频带掺铒光纤超荧光光源

理论研究了双程后向结构掺铒光纤超荧光光源的特性。结果表明 ,在任意反射镜参数下 ,只要选取适当的掺铒光纤长度 ,该结构光源总能实现不依赖于抽运功率的平均波长高稳定性运行 ;在光源高稳定性的前提下 ,反射镜参数优化后的该结构光源具有较宽的频带宽度和较高的抽运效率     

3 dB带宽达80 nm的双包层掺镱超荧光光纤光源

采用大模面积双包层掺镱光纤作为增益介质搭建了一台双程前向超荧光光纤光源,该光源的输出功率随泵浦源注入电流的增加基本呈线性增加,最大输出功率为341 mW。其独特的优势是现实了掺镱光纤最宽的超荧光输出,在输出功率从201～341 mW之间,超荧光光谱的3 dB带宽超过80 nm。其输出功率虽然不是很高,但是在一般情况下能够满足人们对超荧光的需求。从镱离子的能级结构和镱离子在石英基质中的吸收截面与发射截面出发,分析了能够得到最宽超荧光输出的物理原因。这台双包层掺镱超荧光光纤光源由于充分利用了镱离子在1 025和1 075 nm附近的超荧光辐射,因而能够得到3 dB带宽为80 nm的超荧光输出。     

Characteristics of the bandwidth in gain-clamped erbium-doped fiber amplifiers

1.IntYoductionErbium-dopedfiberamplifiers(EDFAs)arepresentlyofgreatinterestinopticalfibercommunicationsystem.Thegainprofiles,thatis,thegainforallwavelengthsofinter-est,areveryimPortantproPertiesofEDFAsinthewavelength-division-multip1exing(WDM)fibersystems['j.Manynumericalandanalyticalmethods(seeforexampleL1jandreferencestherein)canbeusedtoinvestigatethegainprofile8ofEDFAs,buttheyneedcumbersomemeasurementS(forexampIesPectraImeasurementsofEr-dopingabsorWtionandemission,andsoon)andhence…     

Gamma radiation effects on the DPB SFS in space FOGs applications

Superfluorescent fiber source (SFS) is generally considered to be promising in optical sensing. In this paper, the gamma radiation effect on the double pass backward (DPB) SFS was investigated. Firstly, a sample of DPB SFS together with a 9 m Er-doped fiber (EDF) was irradiated by ⁶⁰Co source with radiation dose rate of 3.6 Gy/h and total dose of 200 Gy. And the results were analyzed to find that at the very start of radiation the RIL of the sampled Er-doped fiber was greater than that of sampled SFS while at about 100 Gy the RIL slope of the EDF became less than that of the SFS. Above all, the loss from EDF was dominant to that from the SFS in gamma radiation environment. Mean wavelength of the SFS drifted about 4 nm mainly caused by the radiation loss. In the end, the potential influence to FOGs in space applications was simulated.     

石墨烯可调谐被动调Q掺铒光纤激光器

基于光学沉积方法,制备了石墨烯可饱和吸收体,并利用此可饱和吸收体搭建了环形腔结构的被动调Q掺铒光纤激光器,实现了稳定的调Q激光脉冲输出,其重复频率为5.1~14.2 kHz,最窄激光脉冲宽度为8 s,最大平均功率为162.3 W,且通过调节偏振控制器,中心波长在1556~1558 nm可调。     

基于偏振保持掺Er3+光纤的高稳定性单波长光纤激光器

研制出光敏偏振保持掺Er³⁺光纤,通过在这种光纤上紫外写入三个光纤光栅,形成对抽运激光高转化效率的谐振腔.在输出功率为23.617dBm、工作波长为976nm的激光抽运下,得到均值功率为9.20dBm、均值中心波长为1554.554nm的单波长激光输出.在室温下800min（约13.3h）的测量时间内,其输出功率的波动为±0.05dB,中心工作波长的波动为±0.0015nm. 关键词： 光纤激光器 3+光纤')" href="#">偏振保持掺Er³⁺光纤 光纤Bragg光栅