共查询到17条相似文献,搜索用时 89 毫秒
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偏振无关的楔型光隔离器插入损耗与反向隔离度分析 总被引:3,自引:1,他引:2
在高斯光束传输理论基础上,推导出求解偏振无关楔型光隔离器插入损耗与反向隔离度的数学解析表达式;得出了采用不同材料隔离器的插入损耗,反向隔离度与双折射晶体倾斜角度及双折射晶体和旋转晶体间距的关系曲线,分析了影响光隔离器插入损耗,反向隔离度的因素,实际测量结果与理论分析相吻合。 相似文献
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本文报道了用熔融法由常规的单模通信光纤制造宽温工作的低损耗单模光纤定向耦合器.工作波长为1.52μm,分束比为50%的封装器件;工作温度在-30~+70℃范围,分束比容差小于±5%,插入损耗<0.2dB,隔离度>40dB.工作波长的变化对分束比影响十分明显,但入射光的偏振态对其无实际影响. 相似文献
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采用磁光晶体薄膜、半波片、偏振分束器、偏振合束器和高速法拉第转子等元器件研制了一种具有新型光路的1×2全光纤磁光开关,以用于全光网络通信. 采用雪崩晶体管设计和制作了多种纳秒脉冲发生器,用于驱动法拉第转子中的微型螺线管. 对螺线管的尺寸和结构布局进行了优化设计,并分析螺线管的磁场强度和自感系数等性能参量,以提高磁光开关的开关速度. 磁光开关的性能测试结果表明,纳秒脉冲上升时间为2~5 ns、脉冲宽度为6~12 ns、脉冲幅值为30~150 V. 磁光开关的插入损耗为1.55 dB,串扰为23.69 dB,消光比为-23.69 dB,开关时间为100~400 ns. 该全光纤磁光开关的开关时间已达到纳秒量级. 相似文献
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Compact High-performance Bulk Optical Isolator 总被引:1,自引:0,他引:1
WANG Lindou 《Chinese Journal of Lasers》1998,7(2):126-131
CompactHigh┐performanceBulkOpticalIsolatorWANGLindou(DepartmentofElectronicEngineering,TianjinUniversity,Tianjin300072,China)... 相似文献
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We constructed a lens-free in-line optical isolator by embedding an isolator chip in a thermally expanded core (TEC) fiber without complicated optical alignment. The chip consists of two pairs of rutile wedges and garnet plates. We fabricated the TEC fibers by heating a single-mode fiber with a 200-mum outer diameter; low loss and a spot diameter as large as 49 mum were successfully obtained. The fabricated isolator has excellent optical properties, an insertion loss of 0.45 dB, and an isolation of more than 50 dB at a 1.55-mum wavelength, which confirms the usefulness of the integration techniques. 相似文献
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采用新型棱镜的光学隔离器 总被引:2,自引:1,他引:1
在理论上分析并用实验研究了采用新型光学棱镜作起偏器、检偏器后与偏振无关的光学隔离器性能的变化。结果表明, 隔离器的反向隔离比在原来的基础上提高了将近一倍, 而正向插入损耗增加得很少。研制的光学隔离器光纤光纤的正向损耗与反向隔离比分别为- 0.82 d B 及- 48.1 d B。 相似文献
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K. Xie H.M. Jiang W.Y. Zeng G.J. Wen H.J. Yang A.D. Boardman M. Xie 《Optics Communications》2009,282(19):3883-3888
A novel optical waveguide isolator based on self-phase compensated TE–TM mode conversion was proposed. In this work, the troublesome phase-match condition for the TE–TM mode conversion is eliminated without degradation on the performances. An isolator based on this mechanism is designed and simulated. An insertion loss of −0.1 dB and an isolation of −25 dB was obtained. The tolerance of fabrication and bandwidth of the isolator was also discussed. 相似文献
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We propose and demonstrate an integrated optical isolator in InP using two phase modulators in series. The phase modulators are driven with a single-frequency signal in quadrature. Theoretically there is no effect on the forward signal, and the carrier of the backward signal can be eliminated, the energy distributed to other frequencies. We achieve a carrier isolation of 11?dB and an excess insertion loss of 2.3?dB. Such an isolator can be monolithically integrated with a laser without extra materials or magnetic fields. 相似文献
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介绍了采用位相平衡设计法设计优化的二元微透镜阵列,并应用于工作波长为1.536 ̄1.564μm,通信间隔4nm的8通道光栅型密集波分复用器。设计并计算了二元微透镜各单元的位相结构和接收光纤端面上的衍射远场分布,最后讨论了当采用单模和多模接收光纤时,二元微透镜阵列部分引入的损耗及其在多模接收光纤中激起的基模比例。 相似文献