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Few-Mode Cr-Doped Crystalline Core Fibers for Fiber Amplifier

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6 Author(s)
Wei-Lun Wang ; Dept. of Photonics, Nat. Sun Yat-Sen Univ., Kaohsiung, Taiwan ; Jau-Sheng Wang ; Yi-Chung Huang ; Li-Wei Liu
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A few-mode Cr-doped crystalline core fiber (FMCDCCF) is demonstrated. The fiber fabrication is a modified laser-heated pedestal growth (LHPG) technique that consists of over cladding a Cr:YAG crystal rod with silica and then fine tuning its core size with multiple core reduction through the LHPG system. The FMCDCCF exhibits a core diameter of 2 μm and a V-value around 3.77 to provide the few-mode characteristics. The optical properties of the FMCDCCF are similar to that of a pristine Cr4+:YAG crystalline. A gross gain of the FMCDCCF is measured around 2.3 dB at a wavelength of 1.4 μm.

Published in:

Photonics Technology Letters, IEEE  (Volume:24 ,  Issue: 18 )