Enhancement of asymmetry in light output from front/rear facets in resonance-shifted DFB-LDs
| Autor: | Shogo Ito, Kei-ichiro Ichikawa, Takahiro Numai |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Materials science
business.industry media_common.quotation_subject Mode (statistics) Front (oceanography) Resonance 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Asymmetry Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials law.invention 010309 optics Longitudinal mode Optics law Optical cavity 0103 physical sciences Electrical and Electronic Engineering 0210 nano-technology business Lasing threshold Diffraction grating media_common |
| Zdroj: | Optik. 127:12078-12084 |
| ISSN: | 0030-4026 |
| DOI: | 10.1016/j.ijleo.2016.10.009 |
| Popis: | To enhance asymmetry in light output from front/rear facets in a resonance-shifted DFB-LD maintaining single longitudinal mode (SLM) operation, lasing characteristics of resonance-shifted DFB-LDs with asymmetric regions are simulated. The laser cavity of the resonance-shifted DFB-LD is divided into two regions. Each region has uniform diffraction gratings; a corrugation pitch in Region 1 is different from a corrugation pitch in Region 2; length L 1 of Region 1 is different from length L 2 of Region 2. By adjusting the corrugation pitches of the two regions, a resonance mode in Region 1 and a resonance mode in Region 2 are overlapped. At the overlapped resonance mode, SLM operation is obtained. When a corrugation pitch difference is 0.2 nm with κL 1 = 2 κL 2 = 3 where κ is a grating coupling coefficient, a normalized threshold gain difference is 0.413, which is large enough for SLM operation. Under this condition, the light output ratio from the front/rear facets is 67.6, which is larger than the reported highest value of 51 with SLM operations. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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