Vertical cavity surface emitting laser transverse mode and polarization control by elliptical holes photonic crystal |
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Authors: | Cao Tian Xu Chen Xie Yi-Yang Kan Qiang Wei Si-Min Mao Ming-Ming Chen Hong-Da |
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Affiliation: | a Key Laboratory of Optoelectronics Technology (Beijing University of Technology), Ministry of Education, Beijing 100124, China;b State Key Laboratory of Integrated Optoelectronics, Institute of Semiconductor, Chinese Academy of Sciences, Beijing 100083, China |
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Abstract: | The polarization of traditional photonic crystal (PC) vertical cavity surface emitting laser (VCSEL) is uncontrollable, resulting in the bit error increasing easily. Elliptical hole photonic crystal can control the transverse mode and polarization of VCSEL efficiently. We analyze the far field divergence angle, and birefringence of elliptical hole PC VCSEL. When the ratio of minor axis to major axis b/a=0.7, the PC VCSEL can obtain single mode and polarization. According to the simulation results, we fabricate the device successfully. The output power is 1.7 mW, the far field divergence angle is less than 10°, and the side mode suppression ratio is over 30 dB. The output power in the Y direction is 20 times that in the X direction. |
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Keywords: | photonic crystal vertical cavity surface emitting laser (VCSEL) elliptical holes single mode polarization control |
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