Enhancement of Tetrahedral Chromium (Cr4+) Concentration for High-Gain in Single-Mode Crystalline Core Fibers

IEEE Photonics Journal

Chun-Chuen Yang¹  Yung-Hsiang Tung¹  Sheng-Lung Huang²  Wood-Hi Cheng³  Chun-Nien Liu³  Wei-Chih Cheng³  Jhuo-Wei Li³ 

[1] Department of Physics, Chung Yuan Christian University, Taoyuan, Taiwan;Graduate Institute of Photonics and Optoelectronics, National Taiwan University, Taipei, Taiwan;Graduates Institute of Optoelectronic Engineering, National Chung Hsing University, Taichung, Taiwan;

关键词: Thermal annealing;    fiber fabrication;    fiber amplifiers;    single-mode Cr-doped crystalline-core fiber.;   

DOI  :  10.1109/JPHOT.2020.2974802

来源: DOAJ

【 摘 要 】

Tetrahedral chromium (Cr⁴⁺)-ions is the main contributor to gain in the broadband single-mode Cr-doped crystalline core fibers (SCCFs). We have demonstrated a gross gain of 8-dB on a length of 27-cm for a 300-nm broadband SCCF using a thermal annealing technique. Gross gain and fiber length are the highest yet reported for the SCCF. The record gain is mainly due to both the longer fiber by aligned molten-zone growth and Cr⁴⁺-ions enhancement by thermal annealing. The enhancement mechanism of the Cr⁴⁺-ions in the SCCF is experimentally verified by the means of superconducting quantum interference device (SQUID) and electron probe X-ray micro-analysis (EPMA). As a practical application of the proposed 8-dB gain in the SCCFs in fiber transmissions, a 25-Gb/s error-floor free link is successfully demonstrated.

【 授权许可】

Unknown