Tootfinder

Optical Link Tomography: First Field Trial and 4D Extension
Takeo Sasai, Giacomo Borraccini, Yue-Kai Huang, Hideki Nishizawa, Zehao Wang, Tingjun Chen, Yoshiaki Sone, Minami Takahashi, Tatsuya Matsumura, Masanori Nakamura, Etsushi Yamazaki, Koichi Takasugi, Ting Wang, Yoshiaki Kisaka
https://arxiv.org/abs/2510.09384

Optical Link Tomography: First Field Trial and 4D Extension
Optical link tomography (OLT) is a rapidly evolving field that allows the multi-span, end-to-end visualization of optical power along fiber links in multiple dimensions from network endpoints, solely by processing signals received at coherent receivers. This paper has two objectives: (1) to report the first field trial of OLT, using a commercial transponder under standard DWDM transmission, and (2) to extend its capability to visualize across 4D (distance, time, frequency, and polarization), al…