Improvement in measuring losses by interferometric technique for glass waveguides produced by femtosecond laser writing

Author(s)

Ferreira, Paulo Henrique Dias ; Tribuzi, Vinicius ; Osellame, Roberto ; Ghiglieno, Filippo

• Document type: Journal article
• Source: Optics Communications; v. 530, p. 5-pg., 2022-12-22.

Abstract

This study describes a straightforward and non-destructive interferometric technique for measuring the propagation loss in single-mode optical glass waveguides by exploiting a Fabry-Perot cavity effect. The experiment involves coupling a powerful tunable laser source to a single-mode waveguide that is being tested, then using a detector to analyze the transmission fringes of that source after coating the glass end facets with highly reflective coating. Our first experiment, which used a 22.4-mm-long fabricated waveguide on Non-Iox Gorilla glass to demonstrate the technique, resulted in a propagation loss of 0.49 dB/cm at a transmitting wavelength of about 1575 nm, which is completely consistent with the value obtained by a conventional characterization method. The measurement procedure is also independent from the coupling losses, making the characterization easier and reliable after the manufacturing just with a reversible deposition process on the sample under testing. (AU)

• FAPESP's process: 18/11283-7 - Nonlinear photonics: spectroscopy and advanced processing of materials
• Grantee: Cleber Renato Mendonça
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 16/21322-4 - Production of devices for integrated quantum photonics and sensors using femtosecond laser microfabrication
• Grantee: Paulo Henrique Dias Ferreira
• Support Opportunities: Scholarships abroad - Research
• FAPESP's process: 13/21569-1 - Light interference in semiconductor devices applied to measurements and performances analysis (LISA)
• Grantee: Filippo Ghiglieno
• Support Opportunities: Regular Research Grants