Intermodal coupling of supermodes in a twincore photonic crystal fiber and its application as a pressure sensor

Zhengyong Liu, Ming Leung Vincent Tse, Chuang Wu, Daru Chen, Chao Lu, Hwa Yaw Tam

Research output: Journal article publicationJournal articleAcademic researchpeer-review

65 Citations (Scopus)


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.
Original languageEnglish
Pages (from-to)21749-21757
Number of pages9
JournalOptics Express
Issue number19
Publication statusPublished - 10 Sep 2012

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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