Journal
FRONTIERS OF OPTOELECTRONICS
Volume 9, Issue 3, Pages 450-465Publisher
HIGHER EDUCATION PRESS
DOI: 10.1007/s12200-016-0557-8
Keywords
silicon photonics; asymmetric directional couplers (ADCs); polarization-division multiplexing (PDM); mode-division multiplexing (MDM); polarization beam splitter (PBSs)
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Funding
- National Natural Science Foundation of China (NSFC) [11374263, 6141101056, 61422510]
- Ministry of Education of China [20120101110094]
- Fundamental Research Funds for the Central Universities
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Directional couplers (DCs) have been playing an important role as a basic element for realizing power exchange. Previously most work was focused on symmetric DCs and little work was reported for asymmetric directional couplers (ADCs). In recently years, silicon nanophotonic waveguides with ultra-high index contrast and ultra-small cross section have been developed very well and it has been shown that ADCs based on silicon-on-insulator (SOI) nanophotonic waveguides have some unique ability for polarization-selective coupling as well as mode-selective coupling, which are respectively very important for polarization-related systems and mode-division-mulitplexing systems. In this paper, a review is given for the recent progresses on silicon-based ADCs and the applications for power splitting, polarization beam splitting, as well as mode conversion/(de)multiplexing.
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