<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0035-001X</journal-id>
<journal-title><![CDATA[Revista mexicana de física]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. mex. fis.]]></abbrev-journal-title>
<issn>0035-001X</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Mexicana de Física]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0035-001X2002000500008</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Sensor láser de fibra óptica con una cavidad de 8.6 km formada por dos rejillas de Bragg usadas como espejos]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[May-Alarcón]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Kuzin]]></surname>
<given-names><![CDATA[E. A.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vázquez-Sánchez]]></surname>
<given-names><![CDATA[R. A.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Basurto-Pensado]]></surname>
<given-names><![CDATA[M. A.]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Shlyagin]]></surname>
<given-names><![CDATA[M. G.]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Márquez-Borbón]]></surname>
<given-names><![CDATA[I.]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Instituto Nacional de Astrofísica Optica y Electrónica  ]]></institution>
<addr-line><![CDATA[Puebla ]]></addr-line>
<country>México</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad Autónoma del Estado de Morelos  ]]></institution>
<addr-line><![CDATA[Cuernavaca Morelos]]></addr-line>
<country>México</country>
</aff>
<aff id="A03">
<institution><![CDATA[,Centro de Investigación Científica y de Educación Superior de Ensenada  ]]></institution>
<addr-line><![CDATA[Ensenada Baja California]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2002</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2002</year>
</pub-date>
<volume>48</volume>
<numero>5</numero>
<fpage>434</fpage>
<lpage>437</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0035-001X2002000500008&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0035-001X2002000500008&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0035-001X2002000500008&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Se reporta la operación de un sensor láser de fibra (óptica formado por una fibra dopada con erbio bombeada a 980nm, 8,67km de fibra pasiva y dos rejillas de Bragg colocadas en los extremos de la cavidad láser. Bajo condiciones normales, las rejillas tienen distintas longitudes de onda de reflexión y no hay generación de emisión láser. Las dos rejillas pueden ser puestas a la misma longitud de onda de reflexión, sometiendo a tensión a la rejilla con longitud de onda de reflexión menor, la cual se usa como el elemento sensor. La generación láser muestra que la rejilla está bajo tensión. Además nuestra configuración nos da la posibilidad de conocer la distancia entre las rejillas midiendo la frecuencia de espaciamiento entre modos del láser. En este trabajo se demuestra que puede ser alcanzada una distancia mínima de 25m entre rejillas de Bragg consecutivas cuando se analiza el octavo armónico detectado por un analizador de RF.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[We report the operation of a fiber laser sensor made by an Erbium Doped Fiber pumped at 980nm, an 8,67km passive fiber and two fiber Bragg gratings placed at the ends of the laser cavity. Under normal conditions, the Bragg gratings have different reflection wavelengths and laser emission is not generated. The two Bragg gratings can be placed at the same reflection wavelength when the Bragg grating with the lowest reflective wavelength is strained which can be used as a sensor element. The laser generation thus shows that the Bragg grating is under strain. Furthermore, our configuration gives us the possibility for knowing the distance between two Bragg gratings when the laser beating frequency is measured. A measurement precision better than 25m in 8,67Km is shown to be feasible.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Sensores de fibra]]></kwd>
<kwd lng="es"><![CDATA[láseres de fibra]]></kwd>
<kwd lng="es"><![CDATA[amplificadores de fibra dopada con erbio]]></kwd>
<kwd lng="es"><![CDATA[rejillas de Bragg]]></kwd>
<kwd lng="en"><![CDATA[Fiber sensors]]></kwd>
<kwd lng="en"><![CDATA[fiber lasers]]></kwd>
<kwd lng="en"><![CDATA[Erbium doped fiber amplifiers (EDFAs)]]></kwd>
<kwd lng="en"><![CDATA[fiber Bragg gratings]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  	    <p align="justify"><font face="verdana" size="4">Investigaci&oacute;n</font></p>  	    <p>&nbsp;</p>  	    <p align="center"><font face="verdana" size="4"><b>Sensor l&aacute;ser de fibra &oacute;ptica con una cavidad de 8.6 km formada por dos rejillas de</b> <b>Bragg usadas como espejos</b></font></p>  	    <p>&nbsp;</p>  	    <p align="center"><font face="verdana" size="2"><b>M. May&#45;Alarc&oacute;n<sup>1</sup>, E. A. Kuzin<sup>1</sup>, R. A. V&aacute;zquez&#45;S&aacute;nchez<sup>1</sup>, M. A. Basurto&#45;Pensado<sup>2</sup>, M. G. Shlyagin<sup>3</sup>, I. M&aacute;rquez&#45;Borb&oacute;n<sup>3</sup></b></font></p>  	    <p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2"><i><sup>1</sup> Instituto Nacional de Astrof&iacute;sica, &Oacute;ptica y Electr&oacute;nica Apdo. Post. 51 y 216, C.P. 72000 Puebla, Pue., M&eacute;xico.</i></font></p>  	    <p align="justify"><font face="verdana" size="2"><sup>2</sup> <i>Universidad Aut&oacute;noma del Estado de Morelos Av. Universidad </i>&#35;<i> 1001; Col. Chamilpa; C.P. 62210 Cuernavaca, Mor., M&eacute;xico.</i></font></p>      <p align="justify"><font face="verdana" size="2"><sup>3</sup> <i>Centro de Investigaci&oacute;n Cient&iacute;fica y de Ense&ntilde;anza Superior de Ensenada Baja California, C.P. 22860, M&eacute;xico</i>.</font></p>  	    ]]></body>
<body><![CDATA[<p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2">Recibido el 14 de marzo de 2002.    <br> 	Aceptado el 20 de junio de 2002.</font></p>  	    <p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2"><b>Resumen</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Se reporta la operaci&oacute;n de un sensor l&aacute;ser de fibra (&oacute;ptica formado por una fibra dopada con erbio bombeada a 980<i>nm</i>, 8,67<i>km</i> de fibra pasiva y dos rejillas de Bragg colocadas en los extremos de la cavidad l&aacute;ser. Bajo condiciones normales, las rejillas tienen distintas longitudes de onda de reflexi&oacute;n y no hay generaci&oacute;n de emisi&oacute;n l&aacute;ser. Las dos rejillas pueden ser puestas a la misma longitud de onda de reflexi&oacute;n, sometiendo a tensi&oacute;n a la rejilla con longitud de onda de reflexi&oacute;n menor, la cual se usa como el elemento sensor. La generaci&oacute;n l&aacute;ser muestra que la rejilla est&aacute; bajo tensi&oacute;n. Adem&aacute;s nuestra configuraci&oacute;n nos da la posibilidad de conocer la distancia entre las rejillas midiendo la frecuencia de espaciamiento entre modos del l&aacute;ser. En este trabajo se demuestra que puede ser alcanzada una distancia m&iacute;nima de 25<i>m</i> entre rejillas de Bragg consecutivas cuando se analiza el octavo arm&oacute;nico detectado por un analizador de RF.</font></p>      <p align="justify"><font face="verdana" size="2"><b>Descriptores:</b> Sensores de fibra; l&aacute;seres de fibra; amplificadores de fibra dopada con erbio; rejillas de Bragg.</font></p>      <p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2"><b>Abstract</b></font></p>  	    <p align="justify"><font face="verdana" size="2">We report the operation of a fiber laser sensor made by an Erbium Doped Fiber pumped at 980<i>nm</i>, an 8,67<i>km</i> passive fiber and two fiber Bragg gratings placed at the ends of the laser cavity. Under normal conditions, the Bragg gratings have different reflection wavelengths and laser emission is not generated. The two Bragg gratings can be placed at the same reflection wavelength when the Bragg grating with the lowest reflective wavelength is strained which can be used as a sensor element. The laser generation thus shows that the Bragg grating is under strain. Furthermore, our configuration gives us the possibility for knowing the distance between two Bragg gratings when the laser beating frequency is measured. A measurement precision better than 25<i>m</i> in <i>8,67Km</i> is shown to be feasible.</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>Keywords:</b> Fiber sensors; fiber lasers; Erbium doped fiber amplifiers (EDFAs); fiber Bragg gratings.</font></p>  	    <p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2">PACS: 42.55.Wd; 42.60.Da; 42.81.Pa.</font></p>  	    <p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2"><a href="/pdf/rmf/v48n5/v48n5a8.pdf" target="_blank">DESCARGAR ART&Iacute;CULO EN FORMATO PDF</a></font></p>  	    <p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2"><b>Referencias</b></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">1. G.A. Ball, W.W. Morey and P.K. Cheo, <i>IEEE Photon. Technol. 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