4.7 Article

Ultrathin Lensed Photonic Crystal Fibers with Wide Bandwidth and Long Working Distances

Journal

JOURNAL OF LIGHTWAVE TECHNOLOGY
Volume 39, Issue 8, Pages 2482-2488

Publisher

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2021.3050726

Keywords

Optical fibers; Optical fiber devices; Lenses; Optical fiber networks; Bandwidth; Silicon compounds; Probes; Beam collimation; lensed optical fiber; optical coupling; photonic crystal fiber

Funding

  1. National Natural Science Foundation of China [61775041]
  2. Shanghai Pujiang Program [17PJ1400600]
  3. Open Project of the State Key Laboratory of Advanced Optical Communication Systems and Networks of Shanghai Jiao Tong University [2019GZKF03009]

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An effective approach to fabricating ultrathin lensed photonic crystal fibers (PCFs) with long working distances has been demonstrated in this study. The maximum working distance of lensed PCF has been analytically shown and experimentally optimized, achieving a significantly enhanced collimating working distance and ultrawide working bandwidth. The findings will accelerate various applications using such ultrathin lensed PCFs.
We have demonstrated an effective approach to fabricating ultrathin lensed photonic crystal fibers (PCFs) with long working distances. The analytic function of the maximum working distance of lensed PCF has been first revealed, agreeing well with the numerical solutions. Our specific lensed PCF can be experimentally optimized in terms of the collapsed PCF length and fiber tip curvature by use of a graphite filament furnace. A maximum collimating working distance up to 4.84 mm for a lensed PCF with the diameter of 125 mu m is demonstrated, which is more than four times as long as previous lensed PCFs. The ultrawide working bandwidth over 770 nm is also demonstrated. The significantly enhanced features in terms of key performance parameters such as working distances and bandwidth will accelerate a variety of applications using such ultrathin lensed PCFs.

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