Volume 6 Issue 2
Apr.  2013
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CHEN Xue-kun, ZHANG Lu, WU Zhi-yong. Coupling efficiency of free-space laser coupling into single mode fiber and photonic crystal fiber[J]. Chinese Optics, 2013, 6(2): 208-215. doi: 10.3788/CO.20130602.0208
Citation: CHEN Xue-kun, ZHANG Lu, WU Zhi-yong. Coupling efficiency of free-space laser coupling into single mode fiber and photonic crystal fiber[J]. Chinese Optics, 2013, 6(2): 208-215. doi: 10.3788/CO.20130602.0208

Coupling efficiency of free-space laser coupling into single mode fiber and photonic crystal fiber

doi: 10.3788/CO.20130602.0208
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  • Corresponding author: WU Zhi-yong
  • Received Date: 2012-12-17
  • Rev Recd Date: 2013-01-23
  • Publish Date: 2013-04-10
  • It is necessary to confirm the system parameters by theoretical analysis and experiments for designing a optimum fiber-coupling system. By approximating the mode fields of a Single Mode Fiber(SMF) with a step index and a Photonic Crystal Fiber(PCF) with a Large Mode Area(LMA) using the Gaussian mode field, two analytical expressions for fiber-coupling efficiency in an ideal case and in the presences of lateral offset and fiber-end tilt are derived. Based on the two theoretical expressions, the efficiency for free-space laser coupling into the fibers is computed. Moreover, the validity of the two expressions are verified by experiments. As a result, the theoretical computation and experiments demonstrate that the SMF with the step index is more sensitive to the lateral offset compared to the PCF. When the offset is equal to the radius of the fiber core, the efficiency is only 20.25%, which is a quarter of the theoretical maximum efficiency. Besides, the PCF with the LMA is more sensitive to the fiber-end tilt. When the tilt angle is 2, the efficiency is only 40.5%, which is a half of the theoretical maximum efficiency. In conclusion, the proposed theoretical expressions and experiments can provide accurate parameters for designing fiber-coupling systems.
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