【摘 要】
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In this paper,a fiber grating demodulation system based on two transmission volume Bragg gratings(VBGs)was proposed.In order to resolve the problem that the spectral resolution of the present fiber grating demodulation system is not high enough,the two tr
【机 构】
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School of Optics and Photonics,Beijing Institute of Technology,Beijing 100081,China;Changcheng Insti
论文部分内容阅读
In this paper,a fiber grating demodulation system based on two transmission volume Bragg gratings(VBGs)was proposed.In order to resolve the problem that the spectral resolution of the present fiber grating demodulation system is not high enough,the two transmission VBGs were applied to improve the spectral resolution and reduce the volume of the spectrometer.The diffraction characteristics of the transmission VBGs were analyzed,and the optical path of the two transmission VBGs demodulation system was designed based on the diffraction characteristics.The grating constant,lens parameters,and aberration correction of the system were analyzed and calculated.The calculation showed that the theoretical wavelength range of the demodulation system was from 1525nm to 1565nm and the theoretical optical resolution was 60pm when the grating constant was 0.9168,the angle between two transmission VBGs was 89°,the focal length of the collimator was 60mm,and the focal length of the imaging lens was 131.5mm.The aberration of the system was well corrected by using a lens as the collimator and a reflector as the imaging lens.The system principle prototype was assembled and calibrated,and its performances were experimentally investigated.The results showed that the spectrometer worked stably,with a wavelength range from 1525nm to 1565nm,an optical wavelength resolution of 65.3pm,and a high demodulation speed of 10 kHz.
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