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Chin. Phys. B, 2011, Vol. 20(10): 108503    DOI: 10.1088/1674-1056/20/10/108503
INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY Prev   Next  

Short-wavelength InAlGaAs/AlGaAs quantum dot superluminescent diodes

Liang De-Chun(梁德春), An Qi(安琪), Jin Peng(金鹏), Li Xin-Kun(李新坤), Wei Heng(魏恒), Wu Ju(吴巨), and Wang Zhan-Guo(王占国)
Key Laboratory of Semiconductor Materials Science, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China
Abstract  This paper reports the fabrication of J-shaped bent-waveguide superluminescent diodes utilizing an InAlGaAs/AlGaAs quantum dot active region. The emission spectrum of the device is centred at 884 nm with a full width at half maximum of 37 nm and an output power of 18 mW. By incorporating an Al composition into the quantum dot active region, short-wavelength superluminescent diode devices can be obtained. An intersection was found for the light power-injection current curves measured from the straight-waveguide facet and the bent-waveguide facet, respectively. The result is attributed to the conjunct effects of the gain and the additional loss of the bent waveguide. A numerical simulation is performed to verify the qualitative explanation. It is shown that bent waveguide loss is an important factor that affects the output power of J-shaped superluminescent diode devices.
Keywords:  InAlGaAs quantum dot      superluminescent diode      optical coherence tomography      short wavelength  
Received:  24 March 2011      Revised:  09 May 2011      Accepted manuscript online: 
PACS:  85.60.Jb (Light-emitting devices)  
  78.67.Hc (Quantum dots)  
  81.07.Ta (Quantum dots)  
  81.16.Dn (Self-assembly)  
Fund: Project supported by the National Basic Research Program of China (Grant No. 2006CB604904) and the National Natural Science Foundation of China (Grant Nos. 60876086, 60976057, and 60776037).

Cite this article: 

Liang De-Chun(梁德春), An Qi(安琪), Jin Peng(金鹏), Li Xin-Kun(李新坤), Wei Heng(魏恒), Wu Ju(吴巨), and Wang Zhan-Guo(王占国) Short-wavelength InAlGaAs/AlGaAs quantum dot superluminescent diodes 2011 Chin. Phys. B 20 108503

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