Self-referenced nonlinear interferometry for chromatic dispersion sensing across multiple length scales

• URL: http://arxiv.org/abs/2512.22161v1
• Date: Tue, 16 Dec 2025 12:04:29 GMT
• Title: Self-referenced nonlinear interferometry for chromatic dispersion sensing across multiple length scales
• Authors: Romain Dalidet, Sébastien Tanzilli, Gregory Sauder, Laurent Labonté, Anthony Martin,
• Abstract summary: We present a fiber-integrated nonlinear Sagnac interferometer that exploits cascaded second-order processes to generate frequency-anticorrelated idler light.<n>The measurement is intrinsically self-referenced, as the dispersion-induced phase is extracted from the interference between counter-propagating nonlinear processes.<n>We demonstrate chromatic dispersion measurements on fiber samples ranging from 25 cm to 4 km, spanning short fiber segments to long-haul links.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Chromatic dispersion critically impacts the performance of numerous applications ranging from telecommunication links to ultrafast optics and nonlinear devices, yet fast and precise measurements are challenging, especially for short length-dispersion products. We present a fully fiber-integrated nonlinear Sagnac interferometer that exploits cascaded second-order processes to generate frequency-anticorrelated idler light and achieve odd-order dispersion cancellation without active stabilization. The measurement is intrinsically self-referenced, as the dispersion-induced phase is extracted from the interference between counter-propagating nonlinear processes within the same Sagnac loop, eliminating the need for an external reference arm or prior calibration. Operating entirely at telecom wavelengths and read out on a standard optical spectrum analyzer, the device produces instantaneous, high-visibility fringes and calibration-free spectra using dual-port normalization. We demonstrate chromatic dispersion measurements on fiber samples ranging from 25 cm to 4 km, spanning short fiber segments to long-haul links. This architecture combines self-stability, broadband compatibility, and rapid acquisition, offering a practical metrology tool for both research and industry.

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