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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.

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Correspondence to Rui-xing Zeng.

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Project supported by the National Natural Science Foundation of China (No. 60788403) and the Fundamental Research Funds for the Central Universities of China

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Zeng, Rx., Wang, L. & He, Jj. Design and analysis of a mode-hop-free tunable laser based on etched diffraction grating. J. Zhejiang Univ. - Sci. C 11, 793–797 (2010).

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Key words

  • Semiconductor laser
  • Integrated optics
  • Etched diffraction grating

CLC number

  • TN929.11