共查询到20条相似文献,搜索用时 62 毫秒
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一种新型MEMS滤波器在EDFA中的应用 总被引:2,自引:0,他引:2
文章提出了一种基于微电子机械系统(Micro-Electro-Mechanical Systems,MEMS)的新型可调谐光滤波器(OTF),分析了其基本原理和结构,研究了其光学特性,并制作出了OTF成品.得到的OTF成品体积只有51 mm×16 mm×10 mm,3 dB带宽约为0.3 nm,具有体积小、控制简单和光学性能优良等特点.最后,研究了这种MEMS OTF用于EDFA前置放大器时的特性. 相似文献
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可调谐光滤波器及其WDM应用 总被引:1,自引:0,他引:1
可调光滤波器技术是波分复用系统的关键技术之一,它对于发展全光网络具有极其重要的作用。文章介绍了几种具有潜力的可调谐光滤波器,包括:光纤光栅可调谐滤波器、声光可调滤波器、阵列波导光栅滤波器和光子晶体滤波器等,并分析了它们的工作原理及其在波分复用系统中的应用。 相似文献
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基于长周期光纤光栅的可调谐光滤波器设计 总被引:4,自引:4,他引:0
分析了长周期光纤光栅(LPFGs)透射谱受外界环境折射率变化影响的特性及其原理,进而提出了一种新型的可调谐光滤波器的设计思路.并运用分段光栅的矩阵分析法对其进行了具体的计算。此种光滤波器具有滤波精度高、可实现滤波波长和深度单独、连续调谐及全光纤性等优点,滤波波长调谐范围可达15nm,衰耗深度调谐范围达9dB。 相似文献
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MEMS波长可调谐激光器及其进展 总被引:1,自引:0,他引:1
论述了MEMS波长可调谐激光器及其进展。介绍了几种不同类型的波长可调谐激光器,如基于表面微机械反射镜的MEMS可调谐激光器、基于深腐蚀圆形反射镜的MEMS可调谐激光器、基于闪耀光栅的MEMS可调谐激光器、基于阵列集成的MEMS可调谐DFB激光器和VCSEL基MEMS可调谐激光器。 相似文献
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新型阶梯形可调谐光滤波器的优化设计 总被引:5,自引:1,他引:5
针对阶梯形可调谐光滤波器(LTOF)的结构特点,建立LTOF多光束干涉的理论模型,从理论上对其输出性能和调谐性能进行优化设计。结果表明:通过对输出谱、峰值功率、邻道串扰及3dB带宽进行数值分析和比较,得到了最优级联级数和分光比;设计出峰值损耗低于10dB,邻道串扰低于-12dB和3dB带宽低于5nm的器件,其最优级联级数和分光比分别为20和0.85。提出增大电极长度至1.4倍来覆盖整个58nm的自由频谱区(FSR)的设计方案,实现了连续调谐。 相似文献
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设计了一种基于MEMS技术的可调谐光学滤波器,它通过光栅将输入的宽带光信号色散展开,以一个MEMS扭镜选择将对应滤波器通带的光信号反射至输出端,从而实现光学滤波和波长调谐功能。滤波器的输入端采用单模光纤,输出端采用多模或者少模光纤,可以实现窄带且平顶的通带特性。经过参数优化,仿真分析得结果显示,采用多模/少摸光纤输出的两种滤波器,其0.5 dB和25 dB带宽分别为0.95 nm/0.29 nm和1.39 nm/0.69 nm,分别满足100 GHz和50 GHz信道间隔的DWDM系统要求。由于输出端采用多模或者少摸光纤,从该滤波器输出的光信号不能继续在单模光纤中传输,只能由光探测器接收,因此该滤波器一般应用于全光网络节点中的下载端口。 相似文献
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DBR-based tunable optical filter 总被引:1,自引:0,他引:1
A device structure for implementing a continuously tunable optical filter is described. The proposed filter relies on the creation of a resonant optical cavity between a high-reflectivity mirror and a periodic grating, with a phase control section in between. The filter has only one transmission peak over the entire frequency range, can be tuned in a few nanoseconds, and is suitable for integration with the receiver in a photonic circuit 相似文献
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A dual-purpose, grating-based tunable optical filter/ring laser is described for accurate wavelength selection and generation at customer terminals. The device selects a single-wavelength channel from a HDWDM multiplex with 1 nm channel spacing, and simultaneously generates an identical wavelength as part of a tunable ring laser. The device is tunable over a 125 nm wavelength range, centered in the 1.5 μm low-loss fiber window 相似文献
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A narrowband optical filter of the Sole type is made from a twisted stack of birefringent plates between polarisers. If the plates are replaced by homogeneously aligned liquid-crystal cells whose retardation is controllable, the transmitted wavelength of the filter can be varied over the visible spectrum. The characteristics of a rudimentary device of this type agree with predictions. 相似文献
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《Electron Device Letters, IEEE》2005,26(12):888-890
The monolithic integration of a low-temperature microelectromechanical system (MEMS) and HgCdTe infrared detector technology has been implemented and characterized. The MEMS-based tunable optical filter, integrated with an infrared detector, selects narrow wavelength bands in the range from 1.6 to 2.5 /spl mu/m within the short-wavelength infrared (SWIR) region of the electromagnetic spectrum. The entire fabrication process is compatible with two-dimensional infrared focal plane array technology. The fabricated device consists of an HgCdTe SWIR photoconductor, two distributed Bragg mirrors formed of Ge-SiO-Ge, a sacrificial spacer layer within the cavity, which is then removed to leave an air gap, and a silicon nitride membrane for structural support. The tuning spectrum from fabricated MEMS filters on photoconductive detectors shows a wide tuning range, and high percentage transmission is achieved with a tuning voltage of only 7.5 V. The full-width at half-maximum ranged from 95 to 105 nm over a tuning range of 2.2-1.85 /spl mu/m. 相似文献
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Demonstrates a narrowband (≈1 nm) LiNbO3 acoustically tunable optical filter with a tuning range adequate to span the 1.3-1.55 μm wavelength range, exploiting the considerable advantages of an unconventional x -cut design 相似文献
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Integrated optical, acoustically tunable wavelength filter 总被引:3,自引:0,他引:3
Frangen J. Herrmann H. Ricken R. Seibert H. Sohler W. Strake E. 《Electronics letters》1989,25(23):1583-1584
A TM/TE convertor is combined with a TE-pass polariser on a common LiNbO/sub 3/ chip to obtain an integrated optical, acoustically tunable wavelength filter. Its tuning range is 1.45-1.57 mu m wavelength with a filter half-width of 2.8 nm. Due to the combined acoustical/optical strip guide structure used in the mode convertor, a very low acoustic drive power of only 9 mW is required.<> 相似文献
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