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An interband cascade laser based heterodyne detector with integrated optical amplifier and local oscillator. | LitMetric

AI Article Synopsis

  • Heterodyne detection using interband cascade lasers (ICL) has been widely applied but is often limited by the use of bulky hardware.
  • This study explores a compact integrated ICL platform that utilizes a two-section design: a short section for modulation and a long section as a semiconductor optical amplifier (SOA).
  • The integration includes a racetrack cavity to generate a single-mode reference, allowing for effective heterodyne detection by coupling the reference field into the SOA and observing the beating signal on the integrated detector.

Article Abstract

Heterodyne detection based on interband cascade lasers (ICL) has been demonstrated in a wide range of different applications. However, it is still often limited to bulky tabletop systems using individual components such as dual laser setups, beam shaping elements, and discrete detectors. In this work, a versatile integrated ICL platform is investigated for tackling this issue. A RF-optimized, two-section ICL approach is employed, consisting of a short section typically used for efficient modulation of the cavity field and a long gain section. Such a laser is operated in reversed mode, with the entire Fabry-Pérot waveguide utilized as a semiconductor optical amplifier (SOA) and the electrically separated short section as detector. Furthermore, a racetrack cavity is introduced as on-chip single-mode reference generator. The field of the racetrack cavity is coupled into the SOA waveguide via an 800 nm gap. By external injection of a single mode ICL operating at the appropriate wavelength, a heterodyne beating between the on-chip reference and the injected signal can be observed on the integrated detector section of the SOA-detector.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11052533PMC
http://dx.doi.org/10.1515/nanoph-2023-0762DOI Listing

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