Journal
OPTICS EXPRESS
Volume 25, Issue 10, Pages 11200-11209Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.25.011200
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Funding
- National Natural Science Foundation of China (NSFC) [61575064, U1609219]
- Science and Technology Project of Guangdong [2015B090926010]
- Tip-top Scientific and Technical Innovative Youth Talents of Guangdong special support program [2015TQ01X322]
- Fundamental Research Funds for Central Universities [2015ZP019]
- High-level Personnel Special Support Program of Guangdong Province [2014TX01C087]
- National Science Fund for Distinguished Young Scholars of China [61325024]
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A fiber coupler for low-crosstalk orbital angular momentum mode beam splitter is proposed with the structure of two separate and parallel microfibers. By properly setting the center-to-center distance between microfibers, the crosstalk is less than -20 dB, which means that the purity of the needed OAM mode in output port is higher than 99%. For a fixed overlapping length, high coupling efficiency (> 97%) is achieved in 1545-1560 nm. The operating wavelength is tuned to the whole C-band by using the thermosensitive liquid. So the designed coupler can achieve the tunable coupling ratio over the whole C-band, which is a prospective component for the further OAM fiber system. (C) 2017 Optical Society of America
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