Simulation of structural design with high coupling efficiency in external cavity semiconductor laser

Yangjie Zhang; Wentao Guo; Di Xiong; Xiaofeng Guo; Wenyuan Liao; Haifeng Liu; Weihua Liu; Manqing Tan

doi:10.1088/1674-4926/40/10/102302

Journals >Journal of Semiconductors >Volume 40 >Issue 10 >Page 102302 > Article

Journal of Semiconductors
Vol. 40, Issue 10, 102302 (2019)

Simulation of structural design with high coupling efficiency in external cavity semiconductor laser

Yangjie Zhang^1、2, Wentao Guo¹, Di Xiong^1、2, Xiaofeng Guo¹, Wenyuan Liao^1、2, Haifeng Liu^1、2, Weihua Liu^1、2, and Manqing Tan^1、2

Author Affiliations

¹State Key Laboratory of Integrated Optoelectronics, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China

²Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China

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DOI: 10.1088/1674-4926/40/10/102302 Cite this Article

Yangjie Zhang, Wentao Guo, Di Xiong, Xiaofeng Guo, Wenyuan Liao, Haifeng Liu, Weihua Liu, Manqing Tan. Simulation of structural design with high coupling efficiency in external cavity semiconductor laser[J]. Journal of Semiconductors, 2019, 40(10): 102302 Copy Citation Text

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Abstract

For external cavity semiconductor lasers (ECSLs), high coupling efficiency is critical to reducing the linewidth. In this paper, the coupling efficiency between the laser diode and the waveguide grating has been improved, with proposals for its improvement presented, including adding spot-size conversion (SSC) and using a silicon-on-insulator (SOI) waveguide. The results indicate an increase of coupling efficiency from 41.5% to 93.1%, which exhibits an improvement of approximately 51.6% over conventional schemes. The relationship between coupling efficiency and SOI waveguide structures is mainly concerned in this article. These findings provide a new way for the future research of the narrow linewidth of ECSL.

$ \begin{split} {\rm{overlap}} = & \left| {{\rm{Re}}\left[ {\frac{{\left( {\int {{{{E}}_1} \times {{{H}}_2}} \cdot {\rm{d}}{{S}}} \right)\left( {\int {{{{E}}_2}} \times {{{H}}_1} \cdot {\rm{d}}{{S}}} \right)}}{{\int {{{{E}}_1} }\times {{{H}}_1} \cdot {{S}}}}} \right]} \right. \\ & \times \left. {\frac{1}{{{\rm{Re}}\left( {\int {{{{E}}_2}} \times {{{H}}_2} \cdot {\rm{d}}{{S}}} \right)}}} \right|, \end{split}$

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