Sensitivity Enhancement for Low-Coherence Interferometry
| Autor: | Jose Mora, J. Benitez |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
White light interferometry
Materials science business.industry Low coherence interferometry Optical polarization 02 engineering and technology Optical modulation amplitude Transfer function Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Interferometry 020210 optoelectronics & photonics Optics Sensitivity Phase modulation Microwave photonics 0202 electrical engineering electronic engineering information engineering Insertion loss Optical profile Electrical and Electronic Engineering business Coherence (physics) |
| Zdroj: | RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia instname |
| DOI: | 10.1109/LPT.2017.2748818 |
| Popis: | [EN] In this letter, a sensitivity improvement for systems combining low-coherence interferometry (LCI) and microwave photonics (MWP) is demonstrated. This improvement is due to the introduction of a different modulation format and an exhaustive control of the optical source profile compared with previous MWP-LCI schemes. Our proposal allows to retrieve the visibility of low-coherence interferograms through the analysis of the interference pattern using a dispersive element. We demonstrate that the use of a phase modulator offers better stability and lower insertion loss since a bias point configuration is not needed compared with the intensity modulators typically used in these schemes. The process for controlling the optical source profile permits a comparison between uniform and Gaussian profiles. In this way, the limiting effects of the sidelobes over the achieved sensitivity level are analyzed. The proposed MWP-LCI structure is experimentally demonstrated through the characterization of the electrical transfer function. In this case, a maximum sensitivity of 65 dB is achieved in our MWP-LCI structure showing a 30-dB improvement compared with current proposals. This work was supported in part by the National Project through the Ministerio de Ciencia y Tecnologia under Grant TEC2014-60378-C2-1-R and in part by the Generalitat Valenciana under Grant PROMETEO FASE II/2013/012. (Corresponding author: J. Mora.) |
| Databáze: | OpenAIRE |
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