<?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>S0035-001X2021000200238</article-id>
<article-id pub-id-type="doi">10.31349/revmexfis.67.238</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Detección intradina en comunicaciones ópticas con modulación de fase binaria empleando un lazo de Costas en el dominio del procesamiento digital de señales]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Domínguez Retamoza]]></surname>
<given-names><![CDATA[E. A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Arvizu Mondragón]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rojas Iñiguez]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mendieta Jiménez]]></surname>
<given-names><![CDATA[F.J.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Santos Aguilar]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Centro de Investigación Científica y de Educación Superior de Ensenada  ]]></institution>
<addr-line><![CDATA[Ensenada B.C.]]></addr-line>
<country>México</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional Autónoma de México Centro de Nanociencias y Nanotecnología ]]></institution>
<addr-line><![CDATA[Ensenada B.C.]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2021</year>
</pub-date>
<volume>67</volume>
<numero>2</numero>
<fpage>238</fpage>
<lpage>248</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0035-001X2021000200238&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0035-001X2021000200238&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0035-001X2021000200238&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Reportamos un lazo de Costas para demodulación de un campo óptico con modulación de fase binaria (BPSK). El lazo opera en el dominio del procesamiento digital de señales (DSP) como parte de un receptor digital coherente intradino. Generalmente, la implementación práctica de demodulación BPSK en el dominio óptico no es factible. Por ello, empleamos técnicas basadas en la digitalización a alta velocidad del observable eléctrico post-fotodetección y el lazo de Costas en DSP actúa sobre la señal digitalizada. Elegimos este lazo por ser una estructura óptima tanto de demodulación BPSK como de sincronización de portadora. Normalmente, los lazos de Costas para demodulación BPSK operan con una portadora con frecuencia mayor que la velocidad del bit. Sin embargo, como demostramos en este trabajo, este lazo también puede operar adecuadamente para una velocidad de bit mayor que la frecuencia de portadora (detección intradina). A lo mejor de nuestro conocimiento, el lazo de Costas en DSP para demodulación BPSK intradina se reporta por primera vez en este trabajo. Para el diseño del lazo de Costas intradino nos basamos en el modelo PLL equivalente de un lazo de Costas convencional. Con fines de comparación y evaluación del desempeño, primero implementamos en simulación, un lazo de Costas tradicional y posteriormente, uno intradino. Para nuestras simulaciones, empleamos señales del mundo real (datos binarios y ruido aditivo) adquiridas mediante digitalización. Finalmente, se realizó la caracterización del lazo de Costas intradino empleando una señal eléctrica post-fotodetección digitalizada obtenida a la salida de nuestro receptor digital coherente. Se observó un desempeño muy cercano al obtenido mediante simulación.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract We report a Costas loop for demodulation of an optical field with binary phase modulation (BPSK). The loop operates in the domain of digital signal processing (DSP) as part of an intradyne coherent digital receiver. The practical implementation of BPSK demodulation in the optical domain is generally not feasible. For this reason, we use techniques based on high-speed digitization of the post-photodetection electrical observable, and the Costas loop in DSP acts on the digitized signal. We chose this loop because it is an optimal structure for both BPSK demodulation and carrier synchronization. Typically, Costas loops for BPSK demodulation operate on a carrier with a frequency higher than the bit rate. However, as we demonstrate in this work, this loop can also perform adequately for a bit rate higher than the carrier frequency (intradyne detection). To the best of our knowledge, the Costas loop in DSP for intradyne BPSK demodulation is reported for the first time in this work. To design the intradyne Costas loop, we used the PLL-equivalent model of a conventional Costas loop. For comparison and performance evaluation, we implemented in simulation, first, a traditional Costas loop and later an intradyne one. We use real-world signals (binary data and additive noise) acquired by digitization for our simulations. Finally, we performed the intradyne Costas loop&#8217;s characterization using a digitized post-photodetection electrical signal obtained at the output of our digital coherent receiver. We observe a performance very close to that obtained by simulation.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Detección óptica coherente]]></kwd>
<kwd lng="es"><![CDATA[lazo de costas]]></kwd>
<kwd lng="es"><![CDATA[detección intradina]]></kwd>
<kwd lng="en"><![CDATA[Optical coherent detection]]></kwd>
<kwd lng="en"><![CDATA[costas loop]]></kwd>
<kwd lng="en"><![CDATA[intradyne detection]]></kwd>
</kwd-group>
</article-meta>
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