A simple experimental method for measuring the thermal sensitivity of single-mode fibers
Autor: | Sebastian P. Horvath, Andreas Walther, Lars Rippe, Saskia Bondza, Alexander Bengtsson, Stefan Kröll |
---|---|
Rok vydání: | 2020 |
Předmět: |
010302 applied physics
Materials science business.industry Single-mode optical fiber Physics::Optics Fresnel equations Laser 01 natural sciences 010305 fluids & plasmas law.invention Laser linewidth Optics law 0103 physical sciences Thermal Fiber Sensitivity (control systems) business Instrumentation Order of magnitude |
Zdroj: | The Review of scientific instruments. 91(10) |
ISSN: | 1089-7623 |
Popis: | We present a simple technique to experimentally determine the optical-path length change with temperature for optical single-mode fibers. Standard single-mode fibers act as natural low-finesse cavities, with the Fresnel reflection of the straight cleaved surfaces being ∼3%, for the laser light coupled to them. By measuring the intensity variations due to interference of light reflected from the fiber front and end surfaces, while ramping the ambient temperature, the thermal sensitivity of the optical-path length of the fiber can be derived. Light was generated by a narrow linewidth, low drift laser. With our fairly short test fibers, we found that it was possible to reach a relative precision of the temperature sensitivity, compared to a reference fiber, on the 0.4%-2% scale and an absolute precision of 2%-5%, with the potential to improve both by an order of magnitude. The results for single-acrylate, dual-acrylate, and copper- and aluminum-coated fibers are presented. Values are compared with analytic models and results from a finite element method simulation. With the aid of these measurements, a simple fiber-interferometer, which is insensitive to thermal drifts, could be constructed. |
Databáze: | OpenAIRE |
Externí odkaz: |