Gain-switched dual frequency comb at 2 µm

  • Russell E
  • Corbett B
  • Garcia Gunning F
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Abstract

This article shows a dual frequency comb in the 2 µ m wavelength region using mutually injection locked gain-switched semiconductor lasers. Strained InGaAs multi-quantum-well discrete mode lasers and gain switching were used to generate two optical frequency combs with repetition rates of 2 GHz and 2.0001 GHz respectively, centred at 2.002 µ m. Each optical comb spanned approximately 100 GHz. Through mutual injection locking to an edge comb line common in both combs, a phase locked dual frequency comb was demonstrated with 44 beating tones unique to single comb line pair interactions. This scheme allows for the comb information to be compressed into a 5 MHz detection bandwidth and captured with millisecond acquisition times, which could be of benefit to a number of sensing applications.

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Russell, E., Corbett, B., & Garcia Gunning, F. C. (2022). Gain-switched dual frequency comb at 2 µm. Optics Express, 30(4), 5213. https://doi.org/10.1364/oe.446171

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