Frequency-comb-calibrated swept-wavelength interferometry
Artikel i vetenskaplig tidskrift, 2021

Lasers are often used to characterize samples in a non-destructive manner and retrieve sensing information transduced in changes in amplitude and phase. In swept wavelength interferometry, a wavelength-tunable laser is used to measure the complex response (i.e. in amplitude and phase) of an optical sample. This technique leverages continuous advances in rapidly tunable lasers and is widely used for sensing, bioimaging and testing of photonic integrated components. However, the tunable laser requires an additional calibration step because, in practice, it does not tune at a constant rate. In this work, we use a self-referenced frequency comb as an optical ruler to calibrate the laser used in swept-wavelength interferometry and optical frequency domain reflectometry. This allows for realizing high-resolution complex spectroscopy over a bandwidth exceeding 10 THz. We apply the technique to the characterization of low-loss integrated photonic devices and demonstrate that the phase information can disentangle intrinsic from coupling losses in the characterization of high-Q microresonators. We also demonstrate the technique in reflection mode, where it can resolve attenuation and dispersion characteristics in integrated long spiral waveguides.

Författare

Krishna Sundar Twayana

Chalmers, Mikroteknologi och nanovetenskap (MC2), Fotonik

Zhichao Ye

Chalmers, Mikroteknologi och nanovetenskap (MC2), Fotonik

Òskar Bjarki Helgason

Chalmers, Mikroteknologi och nanovetenskap (MC2), Fotonik

Kovendhan Vijayan

Chalmers, Mikroteknologi och nanovetenskap (MC2), Fotonik

Magnus Karlsson

Chalmers, Mikroteknologi och nanovetenskap (MC2), Fotonik

Victor Torres Company

Chalmers, Mikroteknologi och nanovetenskap (MC2), Fotonik

Optics Express

1094-4087 (ISSN)

Vol. 29 15 24363-24372

Ämneskategorier

Atom- och molekylfysik och optik

Annan fysik

Annan elektroteknik och elektronik

DOI

10.1364/OE.430818

Mer information

Senast uppdaterat

2021-07-30