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Impact of losses in the Bragg section on the dynamics of detuned loaded DBR lasers
KTH, Skolan för informations- och kommunikationsteknik (ICT), Mikroelektronik och tillämpad fysik, MAP.
KTH, Skolan för informations- och kommunikationsteknik (ICT), Fotonik och optik, Fotonik.ORCID-id: 0000-0003-3056-4678
2010 (Engelska)Ingår i: IEEE Journal of Quantum Electronics, ISSN 0018-9197, E-ISSN 1558-1713, Vol. 46, nr 9, s. 1360-1367Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The dynamics of a distributed Bragg reflector laser with optical losses in the Bragg section is studied in detail. It is found that the modulation response depends not only on the detuning of the lasing wavelength from the Bragg reflectivity peak but also on the magnitude of the waveguide losses in the Bragg section. Depending on the losses, the damping of the relaxation peak can either increase or decrease when the laser is detuned on the long wavelength flank of the Bragg peak. Hence, in order to achieve maximum modulation bandwidth of the laser, the laser needs not only to have the correct detuning but also an optimized waveguide loss in the Bragg section. The physical reason for this dependence is discussed in terms of a modified rate equation model.

Ort, förlag, år, upplaga, sidor
2010. Vol. 46, nr 9, s. 1360-1367
Nyckelord [en]
Direct modulation, distributed Bragg reflector (DBR) laser, external cavity, semiconductor laser diode
Nationell ämneskategori
Atom- och molekylfysik och optik
Identifikatorer
URN: urn:nbn:se:kth:diva-14005DOI: 10.1109/JQE.2010.2048013ISI: 000282564000005Scopus ID: 2-s2.0-77955133987OAI: oai:DiVA.org:kth-14005DiVA, id: diva2:329054
Anmärkning
QC 20100707. Uppdaterad från manuskript till artikel (20101203).Tillgänglig från: 2010-07-07 Skapad: 2010-07-07 Senast uppdaterad: 2017-12-12Bibliografiskt granskad
Ingår i avhandling
1. Dynamic Characterization of Semiconductor Lasers and Intensity Modulators
Öppna denna publikation i ny flik eller fönster >>Dynamic Characterization of Semiconductor Lasers and Intensity Modulators
2009 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

The research work presented in this thesis deals with characterization ofdynamics of active photonic devices that are based on semiconductormaterials. The thesis contains an introduction and a collection of publishedarticles in peer reviewed international journals and conferences.The introduction starts with the physical background and a review of thesemiconductor material properties which both affects the design andfabrication of the devices and determine their performance in applicationssuch as wavelength, optical power and attenuation, drive current andvoltage, temperature sensitivity and modulation bandwidth.The next chapter of the introduction is dedicated to various kinds ofsemiconductor lasers. It describes the physical principles, steady stateoperation and the dynamical response. The laser is essentially an opticalcavity consisting of a material with optical gain inbetween two reflectivemirrors. Special attention is given to the spectral shape of the mirrorreflectivity and its effect on the laser dynamics and how these effects canbe distinguished from those of the gain material.In order to improve dynamic performance, it is common that the laser,instead of being directly modulated by varying the drive current, isconnected to a separate modulator. The next chapter is therefore devotedto electroabsorption modulators for high speed intensity modulation andtheir integration to lasers. In order to fully take advantage of the highintrinsic modulation bandwidth of these devices it is important to havea good microwave design to avoid electrical parasitics. A segmented paddesign to achieve this is briefly described.The last part of the introduction covers measurements techniques that wereimplemented to experimentally investigate above devices. A description ofthe measurement methods, including practical hints and methods forevaluation of the measured results are provided.

Ort, förlag, år, upplaga, sidor
Stockholm: KTH, 2009. s. xii, 72
Serie
Trita-ICT/MAP AVH, ISSN 1653-7610 ; 2009:8
Nationell ämneskategori
Atom- och molekylfysik och optik
Identifikatorer
urn:nbn:se:kth:diva-11149 (URN)
Disputation
2009-09-30, KTH-Electrum, sal/ hall C2, Isafjordsgatan 26, Kista, 10:00 (Engelska)
Opponent
Handledare
Anmärkning
QC 20100707Tillgänglig från: 2009-09-22 Skapad: 2009-09-22 Senast uppdaterad: 2010-07-21Bibliografiskt granskad

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