Journal
IEEE PHOTONICS JOURNAL
Volume 12, Issue 2, Pages -Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JPHOT.2020.2974802
Keywords
Thermal annealing; fiber fabrication; fiber amplifiers; single-mode Cr-doped crystalline-core fiber
Funding
- Ministry of Science and Technology of Taiwan (MOST) [107-2221-E-005-062, 108-2221-E-005-069-MY3]
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Tetrahedral chromium (Cr-4)-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 Cr-4-ions enhancement by thermal annealing. The enhancement mechanism of the Cr-4-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.
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