高稳定宽频带掺饵光纤超荧光光源

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，只有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动率的平均波长高稳定性运动行；在光源稳定性的前提下，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。     

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     

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。     

新颖的高功率L-波段掺铒光纤超荧光光源

研究了L-波段超荧光在光纤中的产生机理,设计了一种带光纤圈反射器的双级双程前向输出L-波段光源结构,通过对两级采用掺铒浓度不同的光纤并优化其长度及两级泵浦光功率,实验中获得了功率高达19.86mW(12.98dBm)、中心波长为1577.421nm的L-波段(1555-1620nm)超荧光光源。实现了低浓度掺铒光纤起诱导光及改善光谱的作用,高浓度光纤为主要发光源,采用光纤圈反射器提高了泵浦光的利用效率、光源的平坦度及稳定性。同时分析了结构中各个参量对光源各方面性能的影响,对光源的设计具有指导意义。     

一种高功率掺铒光纤超荧光光源

通过优化掺铒光纤各种参量,用一个980 nm激光二极管作抽运源,采用单程结构,在一根光纤后向获得功率高达31.74 mW(15.02 dBm)的C-波段ASE输出的同时,其前向得到了功率为10.14 mW(10.06 dBm)的L-波段ASE输出.通过简单连接组合可得到输出覆盖C＋L波段(1525~1620 nm)功率＞36 mW的掺铒光纤宽带光源.     

掺铒光纤超荧光光源的理论模拟

应用打靶法的基本思想,提出了一条求解掺铒光纤超荧光光源模拟方程 的有效途径,首次从理论上分析了双程后向结构掺铒光纤超荧光光源的有关特性,并给予了细致的物理解释。     

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。     

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。     

大功率掺Yb双包层光纤宽带超荧光光源

利用波长为976nm的半导体激光器抽运掺Yb双包层光纤,制成了大功率光纤宽带超荧光光源,最大超荧光输出功率为54.11mW;此时斜率效率为69．35％,中心波长为1082nm,3dB带宽为17．2nm。     

1053nm附近掺镱光纤超荧光光源的研究

在理论分析的基础上，提出并实现了利用两个光纤光栅串联结构构成的平坦性较好，特定波 段荧光功率输出较大的超荧光光源，并和光纤反射圈结构和没有反射装置的结构作了比较. 实验利用了1052.54—1053.42nm的反射率为29.6dB和1052.624—1055.60nm的反射率为 34.4dB的两个宽带光纤光栅得到了1052.5—1055.5nm波段的3nm宽的比其他波段要高12dB 的超荧光. 关键词： 串联宽带光纤光栅 超荧光光源 3+光纤')" href="#">掺Yb³⁺光纤 光纤反射圈     

Polarized superfluorescent fiber source

We report the demonstration of a polarized superfluorescent fiber source (SFS) that increases the power output in the desired linearly polarized component by a factor of 1.76 over that of a standard, unpolarized SFS that uses the same pump power. This increase in efficiency is accomplished by insertion of a low-loss polarizer at an optimum point in the erbium-doped fiber of a standard SFS.     

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.     

Yb-doped superfluorescent fiber source with cascaded broad fiber Bragg gratings

In this paper, the Yb-doped superfluorescent fiber source (SFS) with cascaded broad fiber Bragg gratings (FBGs) are reported. The spectral properties of this SFS with cascaded broad FBGs are described and compared with that without cascaded broad FBGs. The experimental results have shown that cascaded broad FBGs can increase the output of some special wave bands.     

High efficiency broad bandwidth erbium-doped superfluorescent fiber source

A practical two-stage double-pass structure using high concentration erbium-doped fiber and 1480-nm pump laser diode is suggested for a high power and broad bandwidth erbium-doped superfluorcscent fiber source. A considerable increase in output power and bandwidth extension is achieved by adding an unpumped fiber and a broadband fiber mirror to make the most of wasted backward amplified spontaneous emission as both pump and input light source simultaneously. Superfluorcscent fiber source with nearly 80-nm bandwidth and 28.6-mW output power is obtained experimentally.     

Multi-wavelength fiber source based on double-pass superfluorescent fiber source and a reflection Mach-Zehnder filter

A spectrum-sliced multi-wavelength fiber source (SS-MWFS) based on double-pass superfluorescent fiber source (SFS) with a reflection Mach-Zehnder filter (RMZF) as the reflected comb filter is demonstrated.With backward pumped configuration, MWFS with 50 wavelength channels of extinction ratio (ER) of 16.7 dB is obtained over the almost total C-band gain region. Total output power of the MWFS is 16.2 mW which shows that a power of about 0.3 mW of per channel is achieved. The SS-MWFS with forward pumped configuration is also discussed for comparing. The backward pumped configuration can provide a larger output power while only a little smaller ER than that of the forward pumped configuration.     

High-power superfluorescent source with a side-pumped Yb-doped double-cladding fiber

A compact supe uorescent source based on an Yb-doped double-cladding fiber amplifier is described. The packaged amplifier is pumped at 975 nm by side-coupling emission from a 2.0-W broad-stripe laser diode through an imbedded V groove. The fiber source generates 485 mW of broadband emission centered at 1055 nm with a 41-nm FWHM flat power spectrum.     

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.     

High-power, single-mode, linearly polarized, ytterbium-doped fiber superfluorescent source

High-power operation of a single-mode, linearly polarized, broadband superfluorescent fiber source has been achieved by using a two-stage cladding-pumped fiber configuration comprising a low power, single-ended, ytterbium-doped superfluorescent fiber seed source and a high-power cladding-pumped, polarization-maintaining, large-mode-area, ytterbium-doped amplifier pumped by a high-power diode source at 976 nm. The source yielded a maximum linearly polarized output of 106 W with a slope efficiency of up to 67% with respect to the launched pump power and with a measured polarization extinction ratio of 13.5 dB. The wavelength spectrum of the superfluorescent source spanned the range continuously from ~1035 to 1100 nm, and the bandwidth (FWHM) of the emission spectrum was 21 nm. The minimum seed power required for an output power over 100 W was only 10 mW, corresponding to an effective power gain in the amplifier stage of 40 dB. Single-spatial-mode operation with a beam propagation factor (M(2))<1.1 was achieved by bending the amplifier fiber to a bend radius of ~8 cm, without a significant reduction in output power.