Finite-difference time-domain analysis and experimental examination of the performance of a coupled-cavity MQW laser/active waveguide at 1.54 μm
| Autor: | Y. Yuan, R. Jambunathan, Jasprit Singh, P. K. Bhattacharya |
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| Rok vydání: | 1997 |
| Předmět: |
Materials science
Extinction ratio business.industry Finite-difference time-domain method Condensed Matter Physics Laser Atomic and Molecular Physics and Optics Semiconductor laser theory law.invention Gallium arsenide chemistry.chemical_compound Optics chemistry law Electrical and Electronic Engineering Reactive-ion etching business Waveguide DC bias |
| Zdroj: | IEEE Journal of Quantum Electronics. 33:408-415 |
| ISSN: | 0018-9197 |
| DOI: | 10.1109/3.556010 |
| Popis: | The performance characteristics of a coupled cavity InGaAsP-InP MQW laser/active waveguide made by one-step epitaxy and well-controlled reactive ion etching (RIE) have been theoretically analyzed and experimentally determined. A theoretical model based on a finite-difference time-domain (FDTD) technique was used to simulate the propagation of an optical wave launched in the coupled system and determine the reflectivity of the facets created by RIE. The calculated effective reflectivity of the coupling region consisting of two facets and an air gap is between 0.45 and 0.55, which is in good agreement with the experimentally measured value of 0.5. The reflectivity of a single etched mirror derived from this value is estimated to be 0.3. A 120-/spl mu/m-long monolithically integrated active waveguide when biased as a modulator and excited by the laser shows a maximum extinction ratio of 8 dB and a modulation bandwidth /spl ges/14 GHz at a dc bias of -0.5 V with a bias swing of 2 V. |
| Databáze: | OpenAIRE |
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