Closed-Loop Polarization Mode Dispersion Mitigation for Fibre-Optic Time and Frequency Transfer
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arXiv
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| Auteurs principaux: | , , , |
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| Format: | Preprint |
| Publié: |
2025
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| _version_ | 1866915161047040000 |
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| author | Fordell, Thomas Wallin, Anders E. Lindvall, Thomas Hanhijärvi, Kalle |
| author_facet | Fordell, Thomas Wallin, Anders E. Lindvall, Thomas Hanhijärvi, Kalle |
| contents | A polarization switching pulse interleaver is shown to be effective in reducing timing noise due to polarization mode dispersion in time and frequency transfer based on mode-locked lasers and standard single-mode fibres. In closed-loop time transfer over a 30-km dispersion-compensated fibre link with 300~fs of differential group delay, polarization interleaving reduced the delay variations to <20fs. The results indicate that the remaining drift is caused by polarization-dependent loss and by AM-to-PM noise conversion in the photodiodes, suggesting the need for a "double-balanced" phase detector in the receiver, that is, a phase detector balanced in power and polarization. By mitigating the polarization dependence, this work demonstrates a simple approach that can potentially yield sub-femtosecond-level, long-term time transfer in long-haul fibre links utilizing standard single-mode fibres. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2502_13706 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Closed-Loop Polarization Mode Dispersion Mitigation for Fibre-Optic Time and Frequency Transfer Fordell, Thomas Wallin, Anders E. Lindvall, Thomas Hanhijärvi, Kalle Optics Instrumentation and Detectors A polarization switching pulse interleaver is shown to be effective in reducing timing noise due to polarization mode dispersion in time and frequency transfer based on mode-locked lasers and standard single-mode fibres. In closed-loop time transfer over a 30-km dispersion-compensated fibre link with 300~fs of differential group delay, polarization interleaving reduced the delay variations to <20fs. The results indicate that the remaining drift is caused by polarization-dependent loss and by AM-to-PM noise conversion in the photodiodes, suggesting the need for a "double-balanced" phase detector in the receiver, that is, a phase detector balanced in power and polarization. By mitigating the polarization dependence, this work demonstrates a simple approach that can potentially yield sub-femtosecond-level, long-term time transfer in long-haul fibre links utilizing standard single-mode fibres. |
| title | Closed-Loop Polarization Mode Dispersion Mitigation for Fibre-Optic Time and Frequency Transfer |
| topic | Optics Instrumentation and Detectors |
| url | https://arxiv.org/abs/2502.13706 |