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Monte Carlo ray trace simulation for micro-ball-lens-integrated high-speed InGaAs p-i-n photodiodes

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8 Author(s)
Yang, Chih-Chao ; Department of Electrical Engineering, National Tsing Hua University, Hsinchu 300, Taiwan, Republic of China ; Huang, Yun-Hsun ; Peng, Te-Chin ; Meng-Chyi Wu
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To widen the alignment tolerance of a 10 Gbytes/s InGaAs p-i-n photodiode, which typically only has an optical coupling aperture of 30 μm in diameter, we have developed a self-positioning ball-lens-on-chip scheme for enlarging the effective coupling aperture. According to the measured results, the 4.5- and 5.3-fold improvements along the transverse and optical axes, respectively, in alignment tolerance have been demonstrated without sacrificing the diode efficiency as a commercially available ruby micro-ball-lens (MBL) with a 300 μm lens diameter integrated on the high-speed photodiode. To further explore the aperture enlargement capability and optimize the structural design, we have constructed a ray trace model based on the Monte Carlo method for the optical coupling system as well. Using this well-constructed simulation model, we further predict that, by integrating a 250 μm diametric ruby MBL on the photodiode with a 20 μm high lens socket, the alignment tolerance can have 7.1- and 10-fold improvements along the transverse and optical axes, respectively. Such a large alignment tolerance permits the usage of conventional passive scheme for photodiode package.

Published in:

Journal of Applied Physics  (Volume:101 ,  Issue: 3 )

Date of Publication:

Feb 2007

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