共查询到19条相似文献,搜索用时 562 毫秒
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对存在偏振模色散(PMD)和群时延(GD)抖动的非理想线性啁啾光纤光栅的色散补偿特性进行了研究。实验测量了啁啾光纤光栅的群时延谱和偏振模色散光谱,理论分析和实验测量表明,啁啾光纤光栅差分群时延(DGD)抖动与其时延抖动密切相关。通过数值模拟方法,计算了线性啁啾光纤光栅偏振模色散眼图代价与入射到啁啾光纤光栅色散补偿器的光信号的偏振方向的关系,计算结果表明在使用啁啾光纤光栅色散补偿器时应对光信号的偏振方向进行调整,以获得最佳补偿效果。另外结合实验数据,模拟计算并讨论了非理想线性啁啾光纤光栅群时延抖动和偏振模色散引起的信号的展宽和脉冲形状的劣化。 相似文献
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啁啾相移光纤光栅的反射谱特性 总被引:10,自引:4,他引:6
相移光纤光栅作为透射型滤波器件降低了使用成本,在光通信和传感领域有着较高的应用价值.将传输矩阵法与谐振理论相结合,详细分析了相移量、相移点位置对啁啾相移光栅反射谱特性的影响,数值模拟和实验结果表明,啁啾相移光栅与均匀相移光栅不同,当位于啁啾光栅中点的相移调制量偏离π/2时,透射峰在偏离光栅反射谱中心的同时深度逐渐减小;当相移点在光栅上的位置发生变化时,透射峰位置也随之改变,但深度基本保持不变.利用啁啾光栅的这种特性,可形成具有多个透射峰的多点相移光栅. 相似文献
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《中国激光》2015,(5)
采用光束传输法分析了横向啁啾体布拉格光栅的衍射特性,实验研究了横向啁啾体布拉格光栅外腔二极管激光器的功率特性、光谱特性和波长调谐特性,数值计算和实验结果表明:横向啁啾体布拉格光栅的峰值衍射效率随着入射光束在啁啾方向上尺寸的增大而降低,光谱选择宽度随着入射光束在啁啾方向上尺寸的增大而增大;当横向啁啾体布拉格光栅的啁啾方向与二极管激光器的快轴方向一致时,外腔二极管激光器的外腔效率为85%,在808.05 nm处的输出激光光谱宽度为0.27 nm;当横向啁啾体布拉格光栅的啁啾方向与二极管激光器的慢轴方向一致时,外腔二极管激光器的外腔效率为89%,在808.05 nm处的输出激光光谱宽度为0.3 nm,两种外腔激光器都较好地实现了约15 nm波长调谐范围,且在整个调谐范围内输出功率波动范围分别小于1%(快轴方向一致)与1.5%(慢轴方向一致)。 相似文献
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A novel method for fabricating dual-wavelength fiber Bragg gratings (FBGs) by using one phase mask is developed. The method is based on a double-exposure technique. Our technique lends itself to writing gratings with controllable reflectivity and separation of two Bragg wavelengths. A grating with two equal transmission peaks of 20.25 dB is obtained by this method and the separation of the two Bragg wavelengths is about 0.8 nm. With the grating, we demonstrate a dual-wavelength erbium-doped fiber ring laser whose interval of the two peaks is 0.8 nm. The laser's peak powers can get 3.1 mW above and have a good stability. 相似文献
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本文用传输矩阵法分析了啁啾Bragg光纤光栅的反射谱特性及时延特性,同时给出了用142mm长相位掩模板和扩束技术研制的色散补偿线性啁啾Bragg光纤光栅的反射谱特性及传输实验结果.实验研制的线性啁啾Bragg光纤光栅样品带宽为0.56~0.84nm,可实现对普通光纤色散补偿100km以上. 相似文献
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A technique involving a compact apparatus that combines the phase mask and two-beam interferometric techniques is presented. It involves the use of a phase mask to diffract the ultraviolet (UV) beam and a cylindrical lens combined with a pair of mirrors to produce two symmetric virtual line sources of UV light. Bragg wavelength and bandwidth of the fiber gratings can be controlled with a simple translation of the fiber and/or the phase mask. Using a 40-mw continuous-wave frequency-doubled argon-ion laser at 244 mm and a single phase mask, a series of chirped fiber gratings with the Bragg wavelength in a wide range around 600 nm and 1300 nm are fabricated in hydrogen-loaded ordinary fibers 相似文献
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Qin Zhang Brown D.A. Reinhart L. Morse T.F. Wang J.Q. Gang Xiao 《Photonics Technology Letters, IEEE》1994,6(7):839-841
Bragg gratings at a specific wavelength are made using an excimer KrF laser and a phase mask. The wavelength can be varied for fine tuning and multiplexing applications by straining the optical fiber during UV illumination. When the strain is removed, the grating formed is at a smaller wavelength than that dictated by the phase mask for the unstrained fiber. This technique was demonstrated by writing two gratings located at the same point in the optical fiber. The transmission from the first grating was used as a means for in situ absolute wavelength tuning. The second grating made with approximately 0.2% axial strain was at 1534.54 nm. Once the grating was made, the strain was removed from the fiber leaving the second grating tuned to 1532.04 nm, a wavelength shift of 2.5 nm 相似文献
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Verdiell J.-M. Koch T.L. Tennant D.M. Feder K. Gnall R.P. Young M.G. Miller B.I. Koren U. Newkirk M.A. Tell B. 《Photonics Technology Letters, IEEE》1993,5(6):619-621
An 8-wavelength distributed Bragg reflector (DBR) array for narrow channel wavelength division multiplexing (WDM) has been fabricated with a new technique for printing first-order Bragg gratings using a phase mask and a conventional incoherent source. All the distributed gratings were printed in a single photolithographic step with a slightly modified mask aligner. The DBR's excellent wavelength control for channels separated by as little as 0.8 nm is described. Many advanced photonic devices relying on gratings like quarter-wave shifted distributed feedback (DFB) lasers and wavelength division multiplexing (WDM) components can potentially be manufactured with this technique in a simple and cost-effective way 相似文献
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为了实现光纤布喇格光栅的快速退火,采用高温电弧等离子体热处理光纤光栅的方法,设计了相关实验进行验证。由实验可知,透射谱深度23dB、中心波长1552.09nm、3dB带宽0.2784nm的光纤光栅,经电弧等离子体放电扫描后,光纤光栅的透射谱深度减小,3dB带宽变窄,中心波长蓝移;随着重复扫描次数的增加,各参量变化趋势减缓,最终透射谱深度减小13dB、中心波长蓝移0.84nm、3dB带宽变窄0.1013nm;将电弧等离子体处理后的光纤光栅放入高温炉24h退火后,透射谱深度、中心波长、3dB带宽均不再发生变化。结果表明,将电弧等离子体用于光纤布喇格光栅的退火处理是可行的,并且具有周期短、涂覆层无损伤的优点。 相似文献
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为了研究双体布喇格光栅外腔二极管激光器的衍射特性,采用一块体布喇格光栅与一块横向啁啾体布喇格光栅组成双体布喇格光栅,理论分析了组合前后体布喇格光栅的衍射特性,实验研究了双体布喇格光栅外腔二极管激光器的输出光谱特性。结果表明,在双体布喇格光栅外腔反馈的作用下,可以实现双波长同时输出,通过横向移动横向啁啾体布喇格光栅,可以在保持其中一个中心波长不变的情况下,使另外的一个波长在800nm~815nm的范围内线性调谐。此研究为基于双体布喇格光栅实现双波长输出的大功率二极管激光器提供了实验指导。 相似文献
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Submicrometre period, first-order Bragg gratings have been written in optical fibre, for the first time to the authors knowledge, by projecting a phase-shifting mask. Gratings with a peak reflectivity of 85% at a Bragg wavelength of 1530 nm were recorded using single pulses from a broadband KrF excimer laser 相似文献