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Frontiers of Optoelectronics

Front. Optoelectron.    2016, Vol. 9 Issue (4) : 571-577     DOI: 10.1007/s12200-016-0495-5
Low dispersion broadband integrated double-slot microring resonators optical buffer
Chuan WANG,Xiaoying LIU(),Minming ZHANG,Peng ZHOU
School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China
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Microring resonator optical buffer is attractive in high-speed optical network system, but ordinary microring resonator use strip waveguide as its basic light guide medium, which cannot provide small footprint, low dispersion and high delay-bandwidth product (DBP) simultaneously. Double-slot waveguide structure was first proposed to construct racetrack-microring resonators. It was found that cascading multiple microrings can increase the delay-bandwidth and lower the dispersion of the resonators by optimizing the structure parameters. Optical buffer cascaded by 8 microrings with flat bandwidth of 20 GHz provided the delay of 150 ps and the dispersion of ~107 ps/nm over 1530−1630 nm, and the footprint of each microring was about 51. This study can provide design methods and theoretical basis support for practical application.

Keywords optical buffer      microring      resonator      delay      slot      waveguide      dispersion     
Corresponding Authors: Xiaoying LIU   
Online First Date: 17 October 2016    Issue Date: 29 November 2016
 Cite this article:   
Chuan WANG,Xiaoying LIU,Minming ZHANG, et al. Low dispersion broadband integrated double-slot microring resonators optical buffer[J]. Front. Optoelectron., 2016, 9(4): 571-577.
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Chuan WANG
Xiaoying LIU
Minming ZHANG
Fig.1  (a) Basic structure and (b) perspective view of racetrack microring resonator; (c) structure of double-slot waveguide made of racetrack microring resonator
Fig.2  Structure of multiple microrings optical buffer
Fig.3  Dispersion spectrum of optimized straight and bent double-slot waveguide
Fig.4  Bend loss of microring with various ring radiuses
Fig.5  Mismatch loss with various ring radiuses
Fig.6  Full-coupling length and index difference with various coupling gap
Fig.7  Optimization results of total delay spectrum
ring index

R / μm


1 0.9547 2.360 2.673 0.189 0.957 -1.56 ´10−6
2 0.9538 2.354 2.773 0.184 0.958 -1.08 ´10−6
3 0.9531 2.350 2.872 0.179 0.959 -6.13 ´10−7
4 0.9528 2.348 2.970 0.175 0.960 -1.47 ´10−7
5 0.9527 2.347 3.069 0.172 0.961 3.11 ´10−7
6 0.9529 2.348 3.166 0.169 0.962 7.56 ´10−7
7 0.9533 2.351 3.263 0.166 0.962 1.19 ´10−6
8 0.9543 2.356 3.359 0.164 0.963 1.60 ´10−6
Tab.1  Structure parameters, loss and dispersion for 8 microrings
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