Multi-facility comparison of InGaAs trap detector responsivity for optical fiber power

Published

September 1, 2025

Author(s)

Kyle Rogers, Jeanne Houston, Zeus Ruiz Gutierrez, Matthew Spidell, Padraic Aither, Marty Gould, John Lehman

Abstract

The absolute responsivity of an optical detector in a trap configuration has been investigated in the interest of high-accuracy fiber-coupled measurements for commercial optical fiber power meters and fiber-coupled single-photon detector calibrations. The highest accuracy measurements of optical power are typically undertaken free space and then disseminated for fiber-coupled measurements with some additional uncertainty. At the lowest uncertainty, the difference between free-space and fiber-coupled optical power measurements can be significant. We present here a complete evaluation of multiple trap detectors consisting of two InGaAs photodiodes and a concave mirror. This evaluation includes fiber-based responsivity at discrete laser wavelengths measured both with cryogenic and room temperature standards (diverging input beam), free-space absolute spectral responsivity over a broad wavelength range (converging beam), free-space responsivity at discrete laser wavelengths (collimated), linearity, and spatial uniformity.

Citation

Metrologia

Volume

62

Pub Type

Journals

Download Paper

https://doi.org/10.1088/1681-7575/adfde4

Local Download

Keywords

trap detector, fiber optic power meter, laser power calibration

Citation

Rogers, K. , Houston, J. , Ruiz Gutierrez, Z. , Spidell, M. , Aither, P. , Gould, M. and Lehman, J. (2025), Multi-facility comparison of InGaAs trap detector responsivity for optical fiber power, Metrologia, [online], https://doi.org/10.1088/1681-7575/adfde4, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=959919 (Accessed October 10, 2025)