Publication: Fuente de luz multilambda para aplicaciones de sensado y comunicaciones ópticas
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2014-09
Defense date
2014-10-02
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Abstract
El objetivo de este trabajo final de grado es dar solución a la actual demanda de fuentes de luz sintonizables y de múltiples longitudes debido al gran interés que despiertan en diferentes campos como los sistemas de multiplexación por división en longitud de onda (WDM), las redes de sensores, la calibración de instrumentos ópticos o la espectroscopia de alta definición.
En la primera parte, se propone el desarrollo experimental de una fuente de luz multilambda en configuración de anillo. Esta configuración está basada en multiplexores y demultiplexor (MUX/DEMUX) y emplea redes de difracción de Bragg (FBGs) para seleccionar las longitudes de onda de operación. Se han obtenido dos líneas de emisión simultáneas con una OSNR (Optical Signal to Noise Ratio) de 20dB. Además, se ha logrado una buena estabilidad del sistema obteniendo fluctuaciones de potencia de 0.1dB.
La segunda parte del proyecto se basa en incorporar a la fuente de luz multilambda un sistema de sintonización que ofrezca una mayor libertad a la hora de ajustar la fuente de luz. Existen numerosos dispositivos comerciales destinados al sensado óptico que trabajan fuera del rango estandarizado de trabajo de los sistemas WDM. Por este motivo, una fuente multilambda sintonizable resulta de especial importancia. El sistema diseñado utiliza los desplazamientos que experimenta la longitud de onda central de la FBG con la temperatura. El desarrollo que se plantea se caracteriza por su bajo coste y por tanto, el rango de sintonización no se puede comparar con sistemas comerciales. El sistema de control de la temperatura permite rangos de sintonización de 3.6 nm a partir de la longitud de onda central a temperatura ambiente.
The aim of this bachelor thesis is to provide a solution to the current demand for tunable and multi-wavelengths light sources, which are of great importance in different applications such as WDM (Wavelength-Division Multiplexing) systems, sensor networks, calibration of optical instruments or high definition spectroscopy. In the first part of the thesis, the experimental development of a multi-wavelength ring light source configuration is proposed. This configuration is based on multiplexers and demultiplexers and employs fiber Bragg gratings (FBGs) to select desired operation wavelengths. Two emission lines have been obtained simultaneously showing an OSNR value of 20dB. Besides, good stability has been managed demonstrating power variations of 0.1dB. The second part of the thesis is based on incorporating a tunable system that provides greater freedom adjusting the light source into the multiwavelength light source developed in the first part. There are many commercial devices used in optical sensing that work out of the standardized working range of the WDM systems. For this reason, a tunable multi-wavelength light source is especially important. The designed system is based on the shift in the Bragg wavelength due to temperature changes. The presented development is characterized by its low cost and therefore, the tuning range can’t be compared with the ones offered by commercial systems. The temperature control system allows tuning ranges of 3.6 nm from the central wavelength at room temperature.
The aim of this bachelor thesis is to provide a solution to the current demand for tunable and multi-wavelengths light sources, which are of great importance in different applications such as WDM (Wavelength-Division Multiplexing) systems, sensor networks, calibration of optical instruments or high definition spectroscopy. In the first part of the thesis, the experimental development of a multi-wavelength ring light source configuration is proposed. This configuration is based on multiplexers and demultiplexers and employs fiber Bragg gratings (FBGs) to select desired operation wavelengths. Two emission lines have been obtained simultaneously showing an OSNR value of 20dB. Besides, good stability has been managed demonstrating power variations of 0.1dB. The second part of the thesis is based on incorporating a tunable system that provides greater freedom adjusting the light source into the multiwavelength light source developed in the first part. There are many commercial devices used in optical sensing that work out of the standardized working range of the WDM systems. For this reason, a tunable multi-wavelength light source is especially important. The designed system is based on the shift in the Bragg wavelength due to temperature changes. The presented development is characterized by its low cost and therefore, the tuning range can’t be compared with the ones offered by commercial systems. The temperature control system allows tuning ranges of 3.6 nm from the central wavelength at room temperature.
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Keywords
Emisión multilambda, Configuración en anillo, Redes de difracción de Bragg, Estabilidad, Sintonización