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Optical Engineering

Experimental demonstration and analysis of compact silicon-nanowire-based couplers
Author(s): Hongqiang Li; Xiaye Dong; Yaoting Bai; Enbang Li; Yang Li; Yu Liu; Wenqian Zhou
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Paper Abstract

Compact 2×2 couplers based on silicon nanowires are fabricated and tested. They include a directional (X) coupler, a cross-gap coupler (CGC), and a multimode interference (MMI) coupler. The length of the X coupler’s parallel film waveguide is 1 μm. The theoretical minimum excess loss of the X coupler is 0.73 dB, whereas its experimental value is 1.0817 dB. CGC has a coupling region length of 24 μm. The minimum excess loss of CGC, which is 0.6 dB in theory, is experimentally determined to be 0.6737 dB. Taper waveguides are used as input/output waveguides for the MMI coupler. The footprint of the MMI region is only 6×57  μm 2 . The excess loss of the MMI coupler is theoretically 0.46 dB, but its experimental value is 0.5423 dB. The experimental nonuniformity of the MMI coupler is 0.0063 dB when the center wavelength is 1.55 μm. The maximum excess loss of the MMI coupler is 0.8233 dB in the wavelength range of 1.52 to 1.58 μm. The simulated and experimental results show that a small 2×2 MMI coupler that is suitable for optoelectronic integration exhibits lower excess loss, wider bandwidth, and better uniformity.

Paper Details

Date Published: 19 June 2013
PDF: 7 pages
Opt. Eng. 52(6) 064003 doi: 10.1117/1.OE.52.6.064003
Published in: Optical Engineering Volume 52, Issue 6
Show Author Affiliations
Hongqiang Li, Tianjin Polytechnic Univ. (China)
Xiaye Dong, Tianjin Polytechnic Univ. (China)
Yaoting Bai, Tianjin Polytechnic Univ. (China)
Enbang Li, The Univ. of Sydney (Australia)
Yang Li, Tianjin Polytechnic Univ. (China)
Yu Liu, Tianjin Polytechnic Univ. (China)
Wenqian Zhou, Tianjin Polytechnic Univ. (China)

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