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Enhanced Modulation Bandwidth by Delayed Push–Pull Modulated DFB Lasers

The bandwidth of a distributed feedback (DFB) directly modulated laser (DML) is limited by its carrier–photon resonance (CPR) frequency. A viable approach to break the bottleneck is to introduce a photon–photon resonance (PPR), since the PPR can happen at a much higher frequency than the CPR. Among...

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Autores principales: Chi, Jiewen, Li, Xun, Niu, Chuanning, Zhao, Jia
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10053570/
https://www.ncbi.nlm.nih.gov/pubmed/36985039
http://dx.doi.org/10.3390/mi14030633
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author Chi, Jiewen
Li, Xun
Niu, Chuanning
Zhao, Jia
author_facet Chi, Jiewen
Li, Xun
Niu, Chuanning
Zhao, Jia
author_sort Chi, Jiewen
collection PubMed
description The bandwidth of a distributed feedback (DFB) directly modulated laser (DML) is limited by its carrier–photon resonance (CPR) frequency. A viable approach to break the bottleneck is to introduce a photon–photon resonance (PPR), since the PPR can happen at a much higher frequency than the CPR. Among the many structures that can possibly generate the PPR, the dual-sectional push–pull modulated (PPM) DFB is of particular interest for its fabrication cost-effectiveness as no regrowth is required. The PPR in the PPM DFB, however, usually shows a rapid roll-off on both edges, which brings in an indentation on the lower frequency side of the PPR peak and, consequently, cuts off the bandwidth. To compensate for this dip, we introduce a detuned PPR and restart the CPR response by exploiting a time delay between the differential signals applied to the PPM DFB. Our simulation result shows that the broadened PPR peak and the restarted CPR response indeed mitigate the dip and effectively expand the PPM-DFB’s bandwidth to approximately 50 GHz, a value double that of the conventional (single-sectional) DFB DML.
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spelling pubmed-100535702023-03-30 Enhanced Modulation Bandwidth by Delayed Push–Pull Modulated DFB Lasers Chi, Jiewen Li, Xun Niu, Chuanning Zhao, Jia Micromachines (Basel) Article The bandwidth of a distributed feedback (DFB) directly modulated laser (DML) is limited by its carrier–photon resonance (CPR) frequency. A viable approach to break the bottleneck is to introduce a photon–photon resonance (PPR), since the PPR can happen at a much higher frequency than the CPR. Among the many structures that can possibly generate the PPR, the dual-sectional push–pull modulated (PPM) DFB is of particular interest for its fabrication cost-effectiveness as no regrowth is required. The PPR in the PPM DFB, however, usually shows a rapid roll-off on both edges, which brings in an indentation on the lower frequency side of the PPR peak and, consequently, cuts off the bandwidth. To compensate for this dip, we introduce a detuned PPR and restart the CPR response by exploiting a time delay between the differential signals applied to the PPM DFB. Our simulation result shows that the broadened PPR peak and the restarted CPR response indeed mitigate the dip and effectively expand the PPM-DFB’s bandwidth to approximately 50 GHz, a value double that of the conventional (single-sectional) DFB DML. MDPI 2023-03-10 /pmc/articles/PMC10053570/ /pubmed/36985039 http://dx.doi.org/10.3390/mi14030633 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Chi, Jiewen
Li, Xun
Niu, Chuanning
Zhao, Jia
Enhanced Modulation Bandwidth by Delayed Push–Pull Modulated DFB Lasers
title Enhanced Modulation Bandwidth by Delayed Push–Pull Modulated DFB Lasers
title_full Enhanced Modulation Bandwidth by Delayed Push–Pull Modulated DFB Lasers
title_fullStr Enhanced Modulation Bandwidth by Delayed Push–Pull Modulated DFB Lasers
title_full_unstemmed Enhanced Modulation Bandwidth by Delayed Push–Pull Modulated DFB Lasers
title_short Enhanced Modulation Bandwidth by Delayed Push–Pull Modulated DFB Lasers
title_sort enhanced modulation bandwidth by delayed push–pull modulated dfb lasers
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10053570/
https://www.ncbi.nlm.nih.gov/pubmed/36985039
http://dx.doi.org/10.3390/mi14030633
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