Low dispersion broadband integrated double-slot microring resonators optical buffer

doi:10.1007/s12200-016-0495-5

Front. Optoelectron.

2016, Vol. 9

Issue (4) : 571-577 https://doi.org/10.1007/s12200-016-0495-5

RESEARCH ARTICLE

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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Abstract

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 ~ $10 − 7$ 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 Author(s): 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.

URL:

https://academic.hep.com.cn/foe/EN/10.1007/s12200-016-0495-5
https://academic.hep.com.cn/foe/EN/Y2016/V9/I4/571

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	$t$	$l c / μm$	$R / μm$	$L / dB$	$α$	$D / （ ps ? nm -1 ）$
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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