Journal
OPTICS LETTERS
Volume 41, Issue 4, Pages 836-839Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.41.000836
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Funding
- National Natural Science Foundation of China (NSFC) [61422510, 61431166001, 91233208]
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A low-loss and broadband silicon thermo-optic switch is proposed and demonstrated experimentally by using a Mach-Zehnder Interferometer with 2 x 2 3 dB power splitters based on bent directional couplers (DCs). The bent DCs are introduced here to replace the traditional 2 x 2 3 dB power splitters based on multimode interferometers or straight DCs, so that one achieves a coupling ratio of similar to 50%: 50%, as well as low excess loss over a broadband. The demonstrated Mach-Zehnder switch (MZS) has a similar to 140 nm bandwidth for an excess loss of <1 dB and an extinction ratio of >20 dB. The present MZS also shows excellent reproducibility and good fabrication tolerance, which makes it promising for realizing N x N optical switches. (C) 2016 Optical Society of America
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