Remote Spectroscopy in the Visible Using Fibers on the Optical Internet Network (original) (raw)
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A standard Multimode optical fiber can be used as a general purpose spectrometer after calibration the wavelength dependent speckle patterns produced by interference between the guided modes of the fiber. A theoretical analysis of the effects of the fiber geometry on the spectrometer performance, and then presents a reconstruction algorithm using a transmission matrix. Both fiber geometry and length have an effect on the spectral resolution and bandwidth, as well as the additional limitation on the bandwidth imposed by speckle patterns contrast reduction when measuring dense spectra is investigated. In a multimode fiber spectrometer, the interference between the guided modes creates a wavelength-dependent speckle patterns, providing the required spectral-to-spatial mapping. The advantage of using an optical fiber is that a long propagation length is easily achieved with minimal loss, giving high spectral resolution. Furthermore, the fiber-based spectrometer requires only a multimode...
PERFORMANCE ANALYSIS OF FIBER OPTIC SPECTROMETER
The multimode optical fiber can be used as a high resolution fiber optic based spectrometer (FOS). After calibration the wavelength dependent speckle patterns produced by interference between the guided modes of the fiber. A performance analysis of the effects of the fiber geometry and length on the spectral resolution and bandwidth, also the additional limitation on the bandwidth imposed by speckle contrast reduction when measuring dense spectra has been demonstrated. A laboratory model using multi-mode optical fiber was designed and implemented for the purpose of spectral analysis based on the recording of the speckle pattern emerging from the other side of the optical fiber. Different prepared concentrations of both Sucrose and NaCl solutions samples tested by different approaches, high resolution and broadband fiber based spectrometer systems. The beam distribution can be represented by the speckle pattern, which can be detected by using a CCD camera placed at the end of the multimode optical fiber. The results of this study demonstrate the advantage of using a multimode optical fiber based spectrometer.
A standard Multimode optical fiber can be used as a general purpose spectrometer after calibration the wavelength dependent speckle patterns produced by interference between the guided modes of the fiber. A theoretical analysis of the effects of the fiber geometry on the spectrometer performance, and then presents a reconstruction algorithm using a transmission matrix. Both fiber geometry and length have an effect on the spectral resolution and bandwidth, as well as the additional limitation on the bandwidth imposed by speckle patterns contrast reduction when measuring dense spectra is investigated. In a multimode fiber spectrometer, the interference between the guided modes creates a wavelength-dependent speckle patterns, providing the required spectral-to-spatial mapping. The advantage of using an optical fiber is that a long propagation length is easily achieved with minimal loss, giving high spectral resolution. Furthermore, the fiber-based spectrometer requires only a multimode fiber and a monochrome CCD camera to record the speckle patterns. Compared to traditional spectrometers, optical fibers are lower cost, lighter weight, and can be coiled into a small volume and providing spectral resolution that is competitive with state-of-the-art grating based spectrometers.