Thermische Effekte in Einer Integrierten Dfb-Laser-Ea-Modulator-Vorrichtung
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Dieses Buch untersucht das thermische �bersprechen in monolithisch integrierten Distributed Feedback (DFB)-Lasern und Elektroabsorptions (EA)-Modulatoren, die in faseroptischen Kommunikationssystemen mit hoher Kapazit�t eingesetzt werden. W�hrend integrierte DFB-Laser-EA-Modulatorquellen einen Hochgeschwindigkeitsbetrieb bis zu 40 Gb/s erm�glichen, wird ihre Leistung durch Chirp begrenzt, das durch thermische Wechselwirkung zwischen den Laser- und Modulatorabschnitten entsteht. Durch eine Kombination aus experimentellen Untersuchungen und FEM-Simulationen (Finite-Elemente-Methode) werden in dieser Arbeit die Mechanismen der W�rmeerzeugung und -ausbreitung sowie deren Auswirkungen auf die Wellenl�ngenstabilit�t analysiert. Die experimentellen Ergebnisse der in den NTT Laboratories hergestellten Ger�te, die bei 1,55 m arbeiten, zeigen, dass eine erh�hte EA-Modulatorvorspannung zu einer h�heren Verlustleistung, einer lokalen Erw�rmung und einer entsprechenden Wellenl�ngenverschiebung im Laser f�hrt. Die Studie best�tigt, dass die thermische Kopplung zwischen den integrierten Abschnitten die Hauptursache f�r die Chirp-Verschlechterung ist.
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