Er-doped superfluorescent fibre source with enhanced mean-wavelength stability using chirped fibre grating

An Er-doped superfluorescent fibre source with enhanced mean-wavelength stability 2 ppm over the 0degC to 70degC range using chirped fibre grating is demonstrated. The effects of the temperature of the fibre, the pump power, the pump wavelength, the pump state of polarisation, and the feedback power have been considered and minimised with corresponding techniques.     

A depolarized Er-doped superfluorescent fiber source with improvedlong-term polarization stability

In a backward Er-doped superfluorescent fiber source (SFS), we report the observation of large mean wavelength variations (>100 ppm) induced by external perturbations of the fiber birefringence. These previously unreported variations, which need to be reduced to the ppm level for high-accuracy fiber-optic gyroscope applications, are shown to originate first from polarization-dependent gain induced by the polarized pump source, and second from a slight polarization dependence of the SFS wavelength division multiplexing (WDM) coupler and fiber isolator. We demonstrate that these effects can be substantially reduced by incorporating two Lyot fiber depolarizers in the source. The new depolarized SFS exhibits short-term mean wavelength stability of ±2.5 ppm and a long-term drift of ±3 ppm. The latter is probably due mostly to slow variations in the Er-doped fiber temperature, which can be eliminated with a simple temperature control to ~0.1°C     

采用光纤滤波器的高波长稳定性掺铒光纤光源

研究了双程后向结构掺铒光纤光源的平均波长对泵浦功率的赖性。实验结果表明,通过采用掺铒光纤滤波器以及选择合适的泵浦功率,平均波长随泵浦功率的变化能够降低到-9 ppm/mW。在-40~+60℃ 温度范围内,光纤光源的平均波长不稳定性小于33 ppm(峰峰值)。采用5 m 长的掺铒光纤、泵浦功率55mW 与泵浦波长974.2nm 时,光纤光源输出光波的谱宽达到17nm,功率达5.83mW。     

A polarization-stable Er-doped superfluorescent fiber source including a Faraday rotator mirror

We report a tenfold stability improvement in the mean wavelength variations induced by polarization fluctuations in an Er-doped superfluorescent fiber source. This was accomplished by replacing the mirror in a double-pass source with a Faraday rotator mirror, thereby nearly eliminating polarization dependent gain. The resulting mean wavelength variations of less than 3.5 parts-per-million (limited by the detection noise floor), approach the requirement for inertial-grade fiber optic gyroscopes.     

抑制掺铒光纤光源强度噪声的方法研究

目前,高精度光纤陀螺普遍采用掺铒光纤光源,对这种陀螺来说检测灵敏度受强度噪声限制.分析了强度噪声的特点及对陀螺的影响,并提出了一种软件实现的方法来抑制强度噪声,经验证随机游走减小了30%.     

高平均波长稳定性超荧光光纤光源

光纤陀螺要求其光源具有高功率、宽谱输出,同时在大温度范围内仍具有好的平均波长稳定性。为了满足-45℃~70℃大温度范围的应用需求,采用双程后向抽运、法拉第旋转反射、带通滤波等技术手段,对光纤材料和器件进行大温区全局优化,以改善超荧光光纤光源的平均波长稳定性。理论分析了不同中心波长和带宽的带通滤波器以及光纤长度等参量对平均波长稳定性的改善效果,以及和光谱带宽的关系。按照设计结果选择滤波、光纤长度等参量,通过对-45℃~70℃全温区范围进行系统全局优化设计,得到输出功率为32mW,功率稳定性为0.65%,光谱带宽为12.5nm,光源平均波长变化量为23.5×10-6。结果表明,平均波长稳定性在0.5×10-6/℃以下的高稳定性超荧光光纤光源中,32mW输出功率非常高;所得的0.2×10-6/℃是115℃大温差范围、30mW以上超荧光光纤光源中非常优异的平均波长稳定性指标,满足光纤陀螺对光纤光源的要求。     

1 Watt Er/Yb singlemode superfluorescent optical fibre source

A singlemode superfluorescent Er/Yb optical fibre source is described, capable of generating >1 W of output power. The spectral bandwidth of the source can be varied between 0.5 and 4 nm by filtering     

High-sensitivity low coherence reflectometer using erbium-doped superfluorescent fibre source and erbium-doped power amplifier

A broadband light source with an output of 150 mW at 1536 nm is constructed by using an erbium-doped power amplifier coupled to an erbium-doped superfluorescent fibre source. A nearly shot-noise-limited sensitivity of -161 dB and a dynamic range of 54 dB are achieved with an optical low coherence reflector using this source.<>     

掺稀土元素光纤超荧光光源

本文介绍了超荧光光纤光源的基本原理、基本结构和研究进展。报道了我们研制的大功率掺Yb^3 双包层光纤超荧光光源。     

Nd/sup 3+/-doped single mode fibre superfluorescent source with 320 mW output power

A diode array pumped Nd/sup 3+/-doped superfluorescent fibre source with 320 mW output power and a 4.6 nm FWHM bandwidth centred at 1058 mu m is reported. The device is prevented from lasing off reflected light from Rayleigh backscatter by seeding an Nd/sup 3+/-doped fibre amplifier with a primary superfluorescent source of moderate power.<>     

超荧光光纤光源的工作特性

研制了一种激光二极管泵浦的掺钕超荧光光纤光源,在波长１．０８μｍ处获得了１．０ｍＷ的光功率输出,谱线宽度为２１．２ｎｍ,实验中使用的是掺钕单模光纤,芯径５μｍ,截止波长１．０μｍ,其损耗在泵浦波长０．８μｍ处为１５００ｄＢ／ｋｍ,而在输出波长１．０８μｍ处为１０ｄＢ／ｋｍ。     

Ultrahigh-sensitivity low coherence OTDR using Er/sup 3+/-doped high-power superfluorescent fibre source

The first-known demonstration of an Er/sup 3+/-doped superfluorescent fibre source coupled to a high-resolution OTDR based on low coherence interference (low coherence OTDR) is reported. Linearly-polarised light with 14 mW output from the source achieves a -146 dB minimum detectable reflectivity at 3 Hz bandwidth. The spatial resolution determined by spectral FWHM is 28 mu m for silica-based waveguides.<>     

Er-doped superfluorescent fiber laser pumped by 1.48 μm laserdiode

Output power of 4 mW at an 80-mW pump power is reported for an Er-doped superfluorescent fiber laser pumped by a 1.48 μm laser diode. A stable spectrum profile of 2-nm bandwidth (FWHM) is observed at output powers above 1 mW. The degree of polarization was observed, and it was found that more than 99.8% of the light was unpolarized within the limit of experimental error     

Characteristics comparison of Er-doped double-pass superfluorescent fiber sources pumped near 980 nm

The Er-doped superfluorescent fiber sources (SFS's) pumped near 980 mm in double-pass forward and backward configurations are compared for the first time. The results indicate that a double-pass backward SFS is superior to the forward counterpart in many aspects: higher output power at various lengths of erbium-doped fiber, better pump-power dependent mean wavelength stability, and larger linewidths at various fiber mirror reflectance.     

High-gain superfluorescent neodymium-doped single-mode fiber source

High-brightness, low-coherence sources are required in a number of optical sensor applications, particularly the fiber-optic gyro. An efficient superfluorescent, neodymium-doped phosphate glass fiber source has been developed which fulfils this requirement. The fiber shows a high-gain efficiency at 1.053 μm of 1 dB/mW pump power and this permits pumping with an 810 nm single-stripe AlGaAs laser diode to obtain >5 mW CW output power at a wavelength of 1.053 μm for only 45 mW of pump power     

Ultra-high-stability two-stage superfluorescent fibre sources forfibre optic gyroscopes

A two-stage ultra-high-stability Er³⁺-doped superfluorescent fibre source for fibre optic gyroscopes is presented. Versatile tunability of the output characteristics against fibre length and pump conditions enables minimisation of all temperature-induced instabilities     

高功率宽带掺铒光纤超荧光光源研究

研究了高掺杂铒光纤构成的双程后向结构超荧光光源输出特性,高掺杂铒光纤在制作超荧光光源方面具有输出功率高和带宽宽的优点.通过模拟得到在一定泵浦功率下获得最大输出带宽的最佳掺铒光纤长度.利用980 nm半导体激光器泵浦优化得到的10 m长的Lucent-LRL光纤,并用自制光纤圈反射镜构成双程后向结构,获得了26 mW的高功率宽带超荧光输出.     

Record-efficient, resonantly-pumped, Er-doped singlemode fibre amplifier

An 85% optical-to-optical efficient, single-frequency performance of resonantly-pumped (at 1476 nm) Yb-free, Er-doped, singlemode fibre amplifier at 1560 nm is reported. The diffraction-limited, single-frequency amplifier is believed to have the highest optical-to-optical efficiency ever reported for Er-doped fibre amplifiers.     

基于双程反向结构的掺铒超荧光光纤光源

给出双程反向结构掺铒超荧光光源的理论分析模型。研制了一种采用双程反向结构，980nm激光二极管泵浦的掺铒超荧光光纤光源。在波长1550nm处，获得了光谱稳定、输出功率大的超荧光。光谱3dB带宽为55nm，并有20nm的ASE光谱平坦区。