Signal enhancement by fiber-dispersion in sub-ghz frequency domain biophotonic diagnosis systems

Sheng Hao Tseng, Tzu Feng Huang, Jun Liang Yeh, Ming Che Chan

研究成果: Article

摘要

Pulsed lasers can be utilized to generate intensity-modulated light at the fundamental frequency of the laser repetition rate as well as higher order modulation (HOM) frequencies in the recent study. We also demonstrated the feasibility of using pulse lasers and fiber-wavelength-convertors as a light source in multicolor frequency-domain (FD) biophotonic systems. In this paper, we present a novel approach to enhancing the intensity of signals below 1 GHz in HOM-based FD systems simply by employing the fiber dispersion effect. The energy spectrum of HOMs can be redistributed to enhance the intensity of HOMs within the bandwidth of the photo-detector without the need for an external (optical or electrical) amplifier. We also demonstrate that the length of dispersive fiber can be optimized via numerical calculations, the results of which are in good agreement with experimental measurements. Finally, we demonstrate a frequency-domain-photon-migration system employing the fiber dispersion effect to enhance sub-GHz signals at a wavelength of 1.03 μm in order to recover the optical properties of turbid samples. Our measurements results demonstrate the superiority of the proposed FD source over the conventional directly modulated FD light source. Furthermore, the simple configuration of the proposed scheme makes it applicable to a wide range of FD biophotonic systems.

原文English
文章編號8378241
期刊IEEE Journal of Selected Topics in Quantum Electronics
25
發行號1
DOIs
出版狀態Published - 2018 一月 1

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering

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