Citation:Scarcella, C., Gradkowski, K., Carroll, L., Lee, J. S., Duperron, M., Fowler, D. and O’Brien, P. (2017) 'Pluggable single-mode fiber-array-to-pic coupling using micro-lenses', IEEE Photonics Technology Letters, 29(22), pp. 1943-1946. doi: 10.1109/LPT.2017.2757082
Single-mode optical coupling between fiber and photonic integrated circuit (PIC) requires precision alignment and bonding, and significantly adds to the cost of photonic packaging. This article describes how a pair of micro-lens arrays-one on the Si-PIC and the other on the fiber-array-can be used to achieve fiber-to-PIC grating-coupling with an insertion-loss of 1.7 dB (i.e., a coupling efficiency of 68%) at 1300 nm, and a 1 dB alignment tolerance of +/- 30 mu m. Such relaxed tolerances allow for a "pluggable" connector to have a make-break insertion-loss reproducibility of 0.2 dB (one standard deviation).
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