An experimental distribution of analog and digital information in a hybrid wireless visible light communication system based on acousto-optic modulation and sinusoidal gratings
| Autor: | I. E. Zaldivar Huerta, A. Vera Marquina, A. Garcia Juarez, A L Leal Cruz, R Gómez Colín, L. A. Garcia Delgado, R Gómez Fuentes |
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| Rok vydání: | 2016 |
| Předmět: |
Physics
business.industry ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION Optical communication Physics::Optics Visible light communication 02 engineering and technology Laser 01 natural sciences Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials law.invention 010309 optics 020210 optoelectronics & photonics Optics law Optical Carrier transmission rates Modulation 0103 physical sciences 0202 electrical engineering electronic engineering information engineering Spatial frequency Photonics business Diffraction grating |
| Zdroj: | Journal of Optics. 18:035701 |
| ISSN: | 2040-8986 2040-8978 |
| DOI: | 10.1088/2040-8978/18/3/035701 |
| Popis: | In this paper we propose a photonic architecture as an alternative tool to distribute point to multipoint analog and digital information over a hybrid wireless visible optical communication system. The experimental set-up is composed of a red laser pointer, an acousto-optic modulator, a sinusoidal grating and a photo-detector array. By using a simple and variable interferometric system, diffraction gratings with different spatial frequencies are generated and recorded on a photoemulsion which is composed of vanilla with dichromate gelatin. Analog video and digital information are first transmitted and recovered over a wireless communication system using a microwave carrier at 4.52 GHz which is generated by distributed feedback lasers operating in the low laser threshold current region. Separately, the recovered video information and digital data are combined with a radio frequency signal of 80 MHz, obtaining a subcarrier of information that is imposed on the optical carrier of the pointer laser using an acousto-optic modulator which is operated with an angle of incident light that satisfies the Bragg condition. The modulated optical carrier is sent to a sinusoidal grating, the diffraction pattern is photo-detected using an array of PIN photo-detectors. The use of sinusoidal gratings with acousto-optic modulators allows that number of channels to be increased when both components are placed in cascade. |
| Databáze: | OpenAIRE |
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