135181 20260217205602.0 doi 10.1109/JLT.2024.3396221 sideral 138498 ART-2024-138498 eng Sevillano, Pascual Universidad de Zaragoza (orcid)0000-0002-4094-3826 Time-expanded FOTDR based on Orthogonal Polarization Frequency Comb generation 2024 Access copy available to the general public Unrestricted Phase-sensitive Optical Time-Domain Reflectometry (ΦOTDR) has emerged as an effective and high-performance solution within the realm of Distributed Optical Fiber Sensing (DOFS) technologies, which has promoted its use in an ever-growing number of fields. The challenges arisen by new operation fields demand surpassing the historical trade-offs in this technology, specially aiming for higher resolution without jeopardizing the system simplicity and cost-effectiveness. In this context, time-expanded (TE-)ΦOTDR has been recently proposed as a DOFS solution delivering cm-range resolution with sub-MHz detection and acquisition bandwidths. It is based on the use of an interferometric scheme that employs a dual frequency comb (DFC), consisting of two mutually coherent optical frequency combs with dissimilar repetition rates. In this paper, we present a novel DFC generation scheme for TE-ΦOTDR that exploits the polarization orthogonality. In particular, our approach considerably increases the common path followed by the two frequency combs, thus reducing instability and noise as compared to the conventional generation scheme. Additionally, we employ an IQ modulation scheme with two PRBS generators that increases the scalability of the interrogator while severely reducing its cost and complexity. Results show a reduction in the noise amplitude spectral density especially at low frequency values, which corroborates the stability enhancement of this proposed architecture as compared to the conventional scheme. info:eu-repo/grantAgreement/ES/DGA-FSE/T20-23R info:eu-repo/grantAgreement/ES/MICINN/PID2020-114916RB-I00 info:eu-repo/grantAgreement/ES/MINECO/DI-17-09169 info:eu-repo/semantics/openAccess by-nc-nd https://creativecommons.org/licenses/by-nc-nd/4.0/deed.es 4.8 2024 ENGINEERING, ELECTRICAL & ELECTRONIC 89 / 368 = 0.242 2024 Q1 T1 TELECOMMUNICATIONS 30 / 120 = 0.25 2024 Q1 T1 OPTICS 26 / 125 = 0.208 2024 Q1 T1 1.294 2024 Atomic and Molecular Physics, and Optics 2024 Q1 9.5 2024 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Preciado-Garbayo, Javier (orcid)0000-0001-5898-8777 Izquierdo, David Universidad de Zaragoza (orcid)0000-0002-4746-3139 Soriano-Amat, Miguel Martin-Lopez, Sonia Gonzalez-Herraez, Miguel Fernández-Ruiz, María R. 2002 385 Universidad de Zaragoza Dpto. Física Aplicada Área Física Aplicada 42, 8 (2024), 6476-6482 J. lightwave technol. Journal of Lightwave Technology 0733-8724 1922311 http://zaguan.unizar.es/record/135181/files/texto_completo.pdf Versión publicada 3838147 http://zaguan.unizar.es/record/135181/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:135181 articulos driver 2026-02-17-20:44:58 ARTICLE