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Performance improvement by metal–dielectric HR coating in laterally coupled DFB laser with metal surface gratings

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Abstract

We report the device characteristics of the metal–dielectric high-reflectivity (HR) coated 1.55 μm laterally coupled distributed feedback (DFB) laser with metal surface gratings by using holographic lithography. The HR coating films are composed of Au/Ti/SiO2. It provides a variety of advantages compared to the uncoated DFB laser on the same processed wafer while there is no degradation on current–voltage characteristics. For 3 μm wide and 300 μm long HR coated DFB laser, it exhibits a maximum output power of ∼17 mW and a threshold current of 14.2 mA at 20°C under continuous-wave mode. It is clear that the threshold current and slope efficiency are improved by 36% and 96%, respectively, due to the reduction of mirror loss. The metal–dielectric HR coating on one facet of DFB laser is found to have significantly increased characteristic temperature (i.e., T 0∼88 K). Furthermore, the stable single-mode operation with an increased single-mode suppression ratio was achieved.

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Authors and Affiliations

  1. Department of Information and Communications, Gwangju Institute of Science and Technology, 1 Oryong-dong, Buk-gu, Gwangju, 500-712, South Korea

    S. J. Jang, C. I. Yeo & Y. T. Lee

  2. Department of Electronic Engineering, Kyung Hee University, 1 Seocheon-dong, Giheung-gu, Yongin, 446-701, South Korea

    J. S. Yu

  3. School of Photon Science and Technology, Gwangju Institute of Science and Technology, 1 Oryong-dong, Buk-gu, 500-712, Gwangju, South Korea

    Y. T. Lee

  4. Department of Nanobio Materials and Electronics, Gwangju Institute of Science and Technology, 1 Oryong-dong, Buk-gu, 500-712, Gwangju, South Korea

    Y. T. Lee

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  1. S. J. Jang
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  2. C. I. Yeo
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  3. J. S. Yu
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  4. Y. T. Lee
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Correspondence to Y. T. Lee.

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Jang, S.J., Yeo, C.I., Yu, J.S. et al. Performance improvement by metal–dielectric HR coating in laterally coupled DFB laser with metal surface gratings. Appl. Phys. B 100, 553–558 (2010). https://doi.org/10.1007/s00340-010-4104-9

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  • DOI: https://doi.org/10.1007/s00340-010-4104-9

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