Narrow-linewidth 1.5μm quantum dot distributed feedback lasers
| Autor: | Bernd Witzigmann, Gadi Eisenstein, Johann Peter Reithmaier, Vitalii Sichkovskyi, Annette Becker, Philipp Baum, Florian Schnabel, Ori Eyal, Anna Rippien, Marko Bjelica |
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| Rok vydání: | 2016 |
| Předmět: |
Physics
business.industry Local oscillator Phase (waves) 02 engineering and technology 021001 nanoscience & nanotechnology Laser Signal law.invention Laser linewidth 020210 optoelectronics & photonics Amplitude Optics law Quantum dot laser Quantum dot 0202 electrical engineering electronic engineering information engineering Optoelectronics Physics::Atomic Physics 0210 nano-technology business |
| Zdroj: | SPIE Proceedings. |
| ISSN: | 0277-786X |
| DOI: | 10.1117/12.2209088 |
| Popis: | The ever-growing need for higher data rates is a driving force for the implementation of higher order coherent communication formats. A key element in coherent detection is the local oscillator (LO) of the decoding unit. This device has to provide coherent light with a narrow linewidth in order to distinguish between different phase and amplitude states of the incoming signal. As predicted by theory, a drastic linewidth reduction is expected from quantum dot (QD) laser materials by the quasi zero-dimensional nature of the gain function. The impact of different gain materials consisting of different numbers of QD layers on the linewidth of distributed feedback (DFB) lasers was investigated and shows an unambiguous dependence on the layer design. Intrinsic linewidths as low as 110 kHz could be determined. |
| Databáze: | OpenAIRE |
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