Journal
OPTICS EXPRESS
Volume 20, Issue 19, Pages 21749-21757Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.20.021749
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Funding
- Central Research Grant of The Hong Kong Polytechnic University under the Postdoctoral Fellowship [G-YX2D, G-U746]
- Projects of Zhejiang Province [2011C21038, 2010R50007]
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In this paper, we experimentally demonstrated the fabrication and hydrostatic pressure characteristics of a twin-core photonic crystal fiber (TC-PCF). Mode couplings in the TC-PCF for x- and y-polarizations were analyzed simultaneously using group effective index of guiding modes. The output spectrum of the TC-PCF was modulated due to the combined couplings of the two polarizations. To the best of our knowledge, it is the first time to measure hydrostatic pressure through the dual-polarization mode coupling in a TC-PCF. The measured sensitivity of the pressure sensor was -21pm/MPa. The length of the TC-PCF used for pressure measurement was 20cm, which is much shorter than pressure sensor based on PM-PCF, and does not require any external polarizing components, meaning that it is a good candidate for compact pressure sensor. (C) 2012 Optical Society of America
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