標題: | Signal Enhancement by Fiber-Dispersion in Sub-GHz Frequency Domain Biophotonic Diagnosis Systems |
作者: | Tseng, Sheng-Hao Huang, Tzu-Feng Yeh, Jun-Liang Chan, Ming-Che 光電學院 College of Photonics |
關鍵字: | Fiber dispersion;mode-locked lasers;femtosecond optics;signal enhancement;diffused optical spectroscopy;frequency-domain biophotonic applications |
公開日期: | 1-一月-2019 |
摘要: | Pulsed lasers can be utilized to generate intensitymodulated 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 frequencydomain-photon-migration system employing the fiber dispersion effect to enhance sub-GHz signals at a wavelength of 1.03 pro 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. |
URI: | http://dx.doi.org/10.1109/JSTQE.2018.2846054 http://hdl.handle.net/11536/147874 |
ISSN: | 1077-260X |
DOI: | 10.1109/JSTQE.2018.2846054 |
期刊: | IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS |
Volume: | 25 |
顯示於類別: | 期刊論文 |