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Proceedings Paper

Optimized optical devices for edge-coupling-enabled silicon photonics platform
Author(s): Ching Eng Png; Thomas Y. L. Ang; Jun Rong Ong; Soon Thor Lim; Ezgi Sahin; G. F. R. Chen; D. T. H. Tan; Tina X. Guo; Hong Wang
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Paper Abstract

We present a library of high-performance passive and active silicon photonic devices at the C-band that is specifically designed and optimized for edge-coupling-enabled silicon photonics platform. These devices meet the broadband (100 nm), low-loss (< 2dB per device), high speed (≥ 25 Gb/s), and polarization diversity requirements (TE and TM polarization extinction ratio ≤ 25 dB) for optical communication applications. Ultra-low loss edge couplers, broadband directional couplers, high-extinction ratio polarization beam splitters (PBSs), and high-speed modulators are some of the devices within our library. In particular, we have designed and fabricated inverse taper fiber-to-waveguide edge couplers of tip widths ranging from 120 nm to 200 nm, and we obtained a low coupling loss of 1.80±0.28 dB for 160 nm tip width. To achieve polarization diversity operation for inverse tapers, we have experimentally realized different designs of polarization beam splitters (PBS). Our optimized PBS has a measured extinction ratio of ≤ 25 dB for both the quasiTE modes, and quasi-TM modes. Additionally, a broadband (100 nm) directional coupler with a 50/50 power splitting ratio was experimentally realized on a small footprint of 20×3 μm2 . Last but not least, high-speed silicon modulators with a range of carrier doping concentrations and offset of the PN junction can be used to optimise the modulation efficiency, and insertion losses for operation at 25 GHz.

Paper Details

Date Published: 22 February 2018
PDF: 7 pages
Proc. SPIE 10537, Silicon Photonics XIII, 105371L (22 February 2018); doi: 10.1117/12.2290313
Show Author Affiliations
Ching Eng Png, A*STAR Institute of High Performance Computing (Singapore)
Optic2Connect Pte. Ltd. (Singapore)
Thomas Y. L. Ang, A*STAR Institute of High Performance Computing (Singapore)
Jun Rong Ong, A*STAR Institute of High Performance Computing (Singapore)
Soon Thor Lim, A*STAR Institute of High Performance Computing (Singapore)
Optic2Connect Pte. Ltd. (Singapore)
Ezgi Sahin, A*STAR Institute of High Performance Computing (Singapore)
Singapore Univ. of Technology and Design (Singapore)
G. F. R. Chen, Singapore Univ. of Technology and Design (Singapore)
D. T. H. Tan, Singapore Univ. of Technology and Design (Singapore)
Tina X. Guo, Nanyang Technological Univ. (Singapore)
Hong Wang, Nanyang Technological Univ. (Singapore)


Published in SPIE Proceedings Vol. 10537:
Silicon Photonics XIII
Graham T. Reed; Andrew P. Knights, Editor(s)

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