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Refractive Index Measurement Research for Optical Fiber Based on Digital Hologram

Gu Ting-Ting Huang Su-Juan Yan Cheng Miao Zhuang Chang Zheng Wang Ting-Yun

Refractive Index Measurement Research for Optical Fiber Based on Digital Hologram

Gu Ting-Ting, Huang Su-Juan, Yan Cheng, Miao Zhuang, Chang Zheng, Wang Ting-Yun
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  • Abstract views:  1109
  • PDF Downloads:  310
  • Cited By: 0
Publishing process
  • Received Date:  01 September 2014
  • Accepted Date:  18 September 2014
  • Published Online:  05 March 2015

Refractive Index Measurement Research for Optical Fiber Based on Digital Hologram

  • 1. Key Laboratory of Special Fiber Optics and Optical Access Networks, School of Communication and Information Engineering, Shanghai University, Shanghai 200072, China
Fund Project:  Project supported by the National Natural Science Foundation of China (Grant Nos. 61178088, 61475098), Shanghai Science and Technology Innovation Action Plan, China (Grant No. 14511100100), and the scientific research plan of Science and Technology Commission of Shanghai Municipality, China (Grant No.14440500100).

Abstract: A test system including light path system and software system is built for measuring the refractive index of fiber by using the digital holographic tomography technology. Based on the phase distribution curve of object wave the optimal hologram is recorded. The spectral range corresponding to the object wave is selected accurately based on the optimization of the spectrum. The phase distribution information of object wave is extracted with the angular spectrum reconstraction. The accuracy of extracted phase information has been verified through the simulation holograms of optical fiber. Combined with the multilayers model of fiber, the refractive index distribution along the diameter direction of fiber tomogram is recovered from a single hologram. Single-mode and multi-mode optical fiber are tested as samples. The experiment results are consistent with the results of S14 refractive index profiler, the precision is 10-4. The compare result shows that our method is simple, fast and accurate for the measurement of the refractive index of fibers. We have also studied the measurement of the refractive index distribution of the special optical fiber.

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