Nonperiodic oscillation with wavelength of mode guided in a special Ti-diffused LiNbO3 waveguide structure
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review
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Detail(s)
Original language | English |
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Article number | 6557425 |
Journal / Publication | IEEE Photonics Journal |
Volume | 5 |
Issue number | 4 |
Publication status | Published - 2013 |
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DOI | DOI |
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Attachment(s) | Documents
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Link to Scopus | https://www.scopus.com/record/display.uri?eid=2-s2.0-84881056565&origin=recordpage |
Permanent Link | https://scholars.cityu.edu.hk/en/publications/publication(7af549ce-8210-4c14-8666-51a67fe31a46).html |
Abstract
We report an abnormal waveguiding phenomenon that the fundamental mode guided in strip waveguides of a special Ti-diffused LiNbO3 waveguide structure, in which an array of 4- and 6-\mu\hbox{m}-wide strip waveguides is embedded in a planar waveguide, nonperiodically oscillates with the wavelength along the waveguide width direction. The oscillation amplitude reaches \sim2 \mu\hbox{m}. The oscillation results in a comb-like transmission spectrum at 1.5\mu\hbox{m} wavelength region. The phenomenon is abnormal as it displays the features of multimode interference (MMI), but the single-mode pattern was captured from the strip waveguide at the 1.5\mu\hbox{m} wavelength. Further numerical analysis for the waveguiding characteristics shows that the strip waveguide also supports a nearly cutoff higher order mode, in addition to the fundamental mode, allowing to explain the abnormal phenomenon: the MMI may take place in some regions of the strip waveguide and the observed single-mode pattern is because the higher order mode, which takes part in the MMI, is close to the cutoff. © 2009-2012 IEEE.
Research Area(s)
- abnormal waveguiding characteristic, multimode interference (MMI), Ti:LiNbO3 (LN) waveguide
Citation Format(s)
Nonperiodic oscillation with wavelength of mode guided in a special Ti-diffused LiNbO3 waveguide structure. / Hua, Ping-Rang; Pun, Edwin Yue-Bun; Yu, Dao-Yin et al.
In: IEEE Photonics Journal, Vol. 5, No. 4, 6557425, 2013.
In: IEEE Photonics Journal, Vol. 5, No. 4, 6557425, 2013.
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review
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