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Bandwidth enhancement and chirp reduction in DBR lasers by strong optical injection
KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT. (Photonics)
KTH, School of Information and Communication Technology (ICT), Microelectronics and Applied Physics, MAP. KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT. (Photonics)ORCID iD: 0000-0003-3056-4678
2000 (English)In: Lasers and Electro-Optics, 2000. (CLEO 2000). Conference on, 2000, 99-100 p.Conference paper, Published paper (Refereed)
Abstract [en]

We have observed modulation bandwidth enhancement to 28 GHz and evidence of reduced chirp, beyond the optimally tuned free running case, in strongly injection-locked DBR lasers. Bandwidth enhancement occurs because the total modal photon density depends on the phase between the master and slave fields, which varies during modulation due to the dependence of index on carrier density. This results in an increased coupling between the carriers and photons, giving an effectively higher differential gain. This effect appears to be stronger than the similar amplitude-phase coupling that occurs with detuned loading. Chirp reduction occurs only for very strong injection, which can be explained by the fact that chirp reduction can only be achieved for modulation frequencies less than the locking range, which increases with injected power. For higher frequencies, the chirp reduction due to detuned loading dominates

Place, publisher, year, edition, pages
2000. 99-100 p.
Keyword [en]
DBR lasers;bandwidth enhancement;chirp reduction;detuned loading;dynamic chirp;higher differential gain;increased carrier-photon coupling;phase dependence;strong optical injection;total modal photon density;chirp modulation;distributed Bragg reflector lasers;laser tuning;optical modulation;phase modulation;semiconductor lasers;
National Category
Telecommunications Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:kth:diva-89307DOI: 10.1109/CLEO.2000.906775OAI: oai:DiVA.org:kth-89307DiVA: diva2:502976
Conference
Conference on Lasers and Electro-Optics
Note
NR 20140805Available from: 2012-02-14 Created: 2012-02-14 Last updated: 2012-02-14Bibliographically approved

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Schatz, Richard

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