E-resources
Peer reviewed
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Quevedo-Galan, Clara; Rosado, Alejandro; Perez-Serrano, Antonio; Tijero, Jose Manuel Garcia; Esquivias, Ignacio
Journal of lightwave technology, 05/2024, Volume: 42, Issue: 10Journal Article
We present a dual-comb spectrometer based on gain-switched optical frequency combs which breaks the current spectral resolution limitation of such systems. The external phase modulation of both combs using pseudorandom binary sequences results in a flat dual-comb spectrum that features a line spacing of 3.937 MHz, which can be further reduced. The system, whose acquisition speed is 250 ms, is validated by the measurement of the amplitude response of a narrow (<inline-formula><tex-math notation="LaTeX">\sim</tex-math></inline-formula>360 MHz) Fabry-Pérot filter. This approach opens up the possibility of using gain switching dual-comb systems for high-resolution applications with a simple, cost-effective, and integrable perspective.
