Parity-time symmetric complex-coupled distributed feedback laser with excellent immunity to external optical feedback
| Autor: | Cheng Ke, Xun Li, Yanping Xi |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Physics
Distributed feedback laser Computer simulation Laser diode business.industry Physics::Optics General Physics and Astronomy Parity (physics) 02 engineering and technology Grating lcsh:QC1-999 law.invention Semiconductor laser theory 020210 optoelectronics & photonics Optics law 0202 electrical engineering electronic engineering information engineering Optoelectronics business Diffraction grating Refractive index lcsh:Physics |
| Zdroj: | AIP Advances, Vol 7, Iss 3, Pp 035010-035010-6 (2017) |
| ISSN: | 2158-3226 |
| Popis: | In this paper, we propose an external optical feedback resistant distributed feedback (DFB) laser diode (LD) by exploiting parity-time symmetric complex coupling. With its complex refractive index followed a parity-time symmetry, the grating shows a strongly asymmetric reflection to the contra-propagating light inside the DFB cavity, which effectively rejects the returning light from one end. Consequently, the DFB LD is much less sensitive to external optical feedback. On the contrary, the transmissivity of such grating is still symmetric so that the output light of the DFB LD is not affected. Numerical simulation result shows that the lasing wavelength drift can be less than 0.2 nm with a SMSR exceeding 45 dB under a coherent external optical feedback as high as -10 dB. |
| Databáze: | OpenAIRE |
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