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Optically synchronized unidirectional optical amplifier-based coherent optical fiber links
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DOI：10.1364/OL.524886.png)
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Abstract
En 中文
We report on the realization of a unidirectional transmission -based bidirectional erbium -doped fiber amplifier (UTB-EDFA) for the coherent optical fiber links. By applying an optical phase -locked loop (OPLL) between the two unidirectional EDFA (Ui-EDFA) paths, the annoying uncorrelated phase noise between the two paths can be largely suppressed. Promisingly, we can independently optimize the gains of the UTB-EDFAs for bidirectional transmissions, resulting in higher net gain acquired compared with the conventional single -path bidirectional EDFA (SPBA)-based ones. We demonstrate that the fractional frequency instability of the UTB-EDFA-based scheme can be decreased by 26.3% over the most asymmetrical 100 km two-way optical frequency comparison (TWC) system compared with the SPBA-based ones and, more importantly, can acquire higher net gain for unevenly distributed sub -links over ultra -long fiber links, such as 1000 km, by independently optimizing the gains. This technique paves the way for the applications of large-scale fiber networks. (c) 2024 Optica Publishing Group
Keywords:
FREQUENCY TRANSFER
AMPLIFICATION