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Title: Optofluidic planar optical cross-connect using nematic liquid-crystal waveguides
Authors: Li, T 
Chen, Q 
Zhang, X 
Issue Date: Aug-2018
Source: IEEE photonics journal, Aug. 2018, v. 10, no. 4, 6601417
Abstract: This paper proposes a compact planar optofluidic optical cross-connect (OXC) switch based on electro-optic (EO) waveguides in nematic liquid crystal (NLC). In the crossbar fabric, each unit cell of the proposed device consists of two portions: the NLC EO waveguides for 1 x 2 switching and the fixed NLC-core waveguides to support subsequent beam paths of the lead-in/lead-out process or the bending process. With numerical simulations, a sample design of 8 x 8 OXC is analyzed and optimized, which provides the predicted broadband performance as approximately 8.0 dB maximum on-chip insertion loss, -45.9 dB cross-talk and 16 ms switching time in the footprint of 2 mm x 2 mm. The loss reduction and the switching speed-up issues are also discussed, with the expected 5.5 dB maximum on-chip insertion loss and 1 ms switching time. The proposed OXC switch is new in the working principle using both electric-field reconfigurable NLC waveguides and fixed NLC-core waveguides, and can leverage the liquid-crystal on silicon fabrication. It is potential for optical circuit switching in the small-scale data centers, or protection switching in optical communication networks.
Keywords: Liquid-crystal devices
Optical switching
Integrated photonics
Publisher: Institute of Electrical and Electronics Engineers
Journal: IEEE photonics journal 
EISSN: 1943-0655
DOI: 10.1109/JPHOT.2018.2853759
Rights: © 2018 IEEE. Translations and content mining are permitted for academic research only. Personal use is also permitted, but republication/redistribution requires IEEE permission. See http://www.ieee.org/publications_standards/publications/rights/index.html for more information.
Posted with Permission from the publisher.
The following publication T. Li, Q. Chen and X. Zhang, "Optofluidic Planar Optical Cross-Connect Using Nematic Liquid-Crystal Waveguides," in IEEE Photonics Journal, vol. 10, no. 4, pp. 1-17, Aug. 2018, Art no. 6601417 is available at https://dx.doi.org/10.1109/JPHOT.2018.2853759
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