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Frontiers of Optoelectronics

Front. Optoelectron.    2016, Vol. 9 Issue (1) : 106-111     DOI: 10.1007/s12200-015-0472-4
Dispersion of double-slot microring resonators in optical buffer
Chuan WANG,Xiaoying LIU(),Peng ZHOU,Peng LI,Jia DU
School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China
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In the optical packet switching network, optical buffer is an important device. Microring resonator optical buffers provide good delay performance and flexibility in design. By cascading multiple microring resonators, higher delay-bandwidth product is obtained, but the requirements of high integration and low dispersion are hard to satisfy simultaneously. Double-slot waveguide was proposed to construct highly integrated racetrack microring resonators in this study. Based on dispersion analysis of the thickness of each layer of a waveguide, the structure of waveguide was optimized to reach flat and low dispersion. Average dispersions of straight and 3 μm bend waveguides were 5.1 ps/(nm?km) and 4.4 ps/(nm?km), respectively. Besides, the additional loss from coupling was greatly reduced when applying proper relative displacement between straight and bend waveguides. Theoretical and design basis provided in this paper will help to develop multi-microring optical buffers in the future.

Keywords microring      optical buffer      double-slot waveguide     
Corresponding Authors: Xiaoying LIU   
Just Accepted Date: 26 January 2015   Online First Date: 13 February 2015    Issue Date: 18 March 2016
 Cite this article:   
Chuan WANG,Xiaoying LIU,Peng ZHOU, et al. Dispersion of double-slot microring resonators in optical buffer[J]. Front. Optoelectron., 2016, 9(1): 106-111.
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Chuan WANG
Xiaoying LIU
Peng LI
Jia DU
Fig.1  (a) Structure and (b) space diagram of microring resonator; (c) structure of double-slot waveguide
Fig.2  Dispersion tailored by thickness (nm) of upper waveguide
Fig.3  Dispersion tailored by thickness (nm) of upper slot
Fig.4  Dispersion tailored by thickness (nm) of lower slot
Fig.5  Dispersion tailored by thickness (nm) of lower slot
Fig.6  Dispersion tailored by thickness (nm) of lower slot
Fig.7  Dispersion tailored by radius (μm) of bend waveguide
Fig.8  Dispersion of straight double-slot waveguide
Fig.9  Keep the middle layer unchanged of (a) straight and (b) bend waveguide structure
Fig.10  Dispersion of bend waveguide before and after optimization
Fig.11  Mode distributions at 1.55 μm of (a) straight and (b) bend waveguide
Fig.12  Schematic of waveguide offset
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