Journal
OPTICS EXPRESS
Volume 25, Issue 15, Pages 17639-17649Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.25.017639
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Funding
- National Natural Science Foundation of China (NSFC) [61505105, 61675217, 61522510]
- Shanghai Yangfan Program [14YF1401600]
- Strategic Priority Research Program of CAS [XDB16030700]
- Key Research Program of Frontier Science of CAS [QYZDB-SSW-JSC041]
- STCSM Excellent Academic Leader of Shanghai [17XD1403900]
- Open Fund of IPOC (BUPT)
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All-optical phase shifters and switches play an important role for various all-optical applications including all-optical signal processing, sensing and communication. In this paper, we demonstrate a fiber all-optical phase shifter using few-layer 2D material tungsten disulfide (WS2) deposited on a tapered fiber. WS2 absorbs injected 980 nm pump (control light) and generates heat, which changes the refractive index of both WS2 and tapered fiber due to thermo-optic effect and achieves a maximum phase shift of 6.1 pi near 1550 nm. The device has a loss of 3.7 dB. By constructing a Mach-Zehnder interferometer with WS2 based phase shifter in one arm, an all-optical switch is also obtained with an extinction ratio of 15 dB and a rise time of 7.3 ms. This all fiber low-cost and compact optical phase shifter and switch demonstrates the potential of 2D transition metal dichalcogenides for all-optical signal processing devices. (C) 2017 Optical Society of America
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