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Front. Inform. Technol. Electron. Eng.  2010, Vol. 11 Issue (10): 793-797    DOI: 10.1631/jzus.C0910622
    
Design and analysis of a mode-hop-free tunable laser based on etched diffraction grating
Rui-xing Zeng*, Lei Wang, Jian-jun He
Center for Integrated Optoelectronics, State Key Lab of Modern Optical Instrumentation, Zhejiang University, Hangzhou 310027, China
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Abstract  A novel semiconductor laser which can achieve mode-hop-free tuning is proposed. The device consists of an etched diffraction grating (EDG) as a dispersive element to provide the mode selection function and an active waveguide to provide optical gain for the laser. The slab waveguide region of the EDG contains a tuning section covered by an electrode to inject a tuning current, and thus changes the refractive index. Mode-hop-free tuning is achieved by specially designing the shape of the tuning section, so that the tuning rate of the central wavelength reflected by the EDG and the tuning rate of the resonant wavelength of the laser cavity are equal. An optimized tuning section shape is designed to obtain the largest tuning range within a limited current range. Numerical simulation is presented to demonstrate the mode-hop-free tuning operation.

Key wordsSemiconductor laser      Integrated optics      Etched diffraction grating     
Received: 17 October 2009      Published: 30 September 2010
CLC:  TN929.11  
Fund:  Project  supported  by  the  National  Natural  Science  Foundation  of China (No. 60788403) and the Fundamental Research Funds for the
Central Universities of China
Cite this article:

Rui-xing Zeng, Lei Wang, Jian-jun He. Design and analysis of a mode-hop-free tunable laser based on etched diffraction grating. Front. Inform. Technol. Electron. Eng., 2010, 11(10): 793-797.

URL:

http://www.zjujournals.com/xueshu/fitee/10.1631/jzus.C0910622     OR     http://www.zjujournals.com/xueshu/fitee/Y2010/V11/I10/793


Design and analysis of a mode-hop-free tunable laser based on etched diffraction grating

A novel semiconductor laser which can achieve mode-hop-free tuning is proposed. The device consists of an etched diffraction grating (EDG) as a dispersive element to provide the mode selection function and an active waveguide to provide optical gain for the laser. The slab waveguide region of the EDG contains a tuning section covered by an electrode to inject a tuning current, and thus changes the refractive index. Mode-hop-free tuning is achieved by specially designing the shape of the tuning section, so that the tuning rate of the central wavelength reflected by the EDG and the tuning rate of the resonant wavelength of the laser cavity are equal. An optimized tuning section shape is designed to obtain the largest tuning range within a limited current range. Numerical simulation is presented to demonstrate the mode-hop-free tuning operation.

关键词: Semiconductor laser,  Integrated optics,  Etched diffraction grating 
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