Accession Number:

AD1099786

Title:

Mode-Crossing Spectroscopy for Photonic Waveguide Characterization

Descriptive Note:

Journal Article - Open Access

Corporate Author:

NAVAL RESEARCH LAB WASHINGTON DC WASHINGTON United States

Personal Author(s):

• Tyndall ,N. F.
• Stievater ,T. H.
• Kozak ,D. A.
• Pruessner ,M. W.
• Rabinovich ,W. S.

Report Date:

2019-10-11

Pagination or Media Count:

7.0

Abstract:

We report a novel spectroscopic technique to characterize photonic waveguides over more than an octave of wavelength. The technique, called mode-crossing spectroscopy, uses a broadband source and a spectrometer that are coupled to the input and output ends of a series of straight dielectric waveguides via single-mode optical fibers. Measurements of the wavelengths at which multiple modes are degenerate in a single waveguide enable the determination of the refractive index of the core, as well as the waveguide width variation. In addition, mode-dependent losses are reported from 700 nm to 1550 nm using waveguides of varying lengths. The core refractive indices are measured within an error of - 0.5 , waveguide width variation to an accuracy of less than 5 nm, and waveguide propagation losses within an error of - 0.5 dBcm. Ultrabroadband in situ measurements of loss and index over an octave of bandwidth are crucial for the accurate characterization of photonic integrated circuits and devices, especially those based on precision broadband couplers, interferometers, and resonant cavities. C 2019 Authors.

Descriptors:

• detectors
• optical fibers
• polarization
• spectra
• bandwidth
• integrated circuits
• photonic devices
• photonic integrated circuits
• optical properties
• measurement
• spectroscopy
• spectrometers
• dielectric waveguides

Subject Categories:

• Atomic and Molecular Physics and Spectroscopy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE