Nested microring resonator with a doubled free spectral range for sensing application

doi:10.1007/s12200-017-0670-3

Front. Optoelectron.

2017, Vol. 10

Issue (2) : 144-150 https://doi.org/10.1007/s12200-017-0670-3

RESEARCH ARTICLE

Nested microring resonator with a doubled free spectral range for sensing application

Xin ZHANG(

), Jiawen JIAN, Han JIN, Peipeng XU

Faculty of Electrical Engineering and Computer Science, Ningbo University, Ningbo 315211, China

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Abstract

The microring resonator has received increasing attention in the optical sensing application because of its micro-size, optical property, and high sensitivity. An additional waveguide is commonly used to change the output spectra in the early research on microring resonators. In this study, we proposed a nested microring resonator that doubles the free spectral range (FSR) compared with the conventional single microring. This structure improved the sensing property as the FSR in the filter output spectra could be considered as a measurement range in the microring sensor. Moreover, the parameters including the coupling coefficient of the three coupling sections, length of the U-bend waveguide, and effective index of a waveguide were tested and carefully selected to optimize the sensing properties. The relationship between these parameters and the output spectra was demonstrated. With linear sensitivity, the structure has a good potential in sensing application.

Keywords microring resonator double free spectral range (FSR) sensing application large measurement range

Corresponding Author(s): Xin ZHANG

Just Accepted Date: 12 January 2017 Issue Date: 05 July 2017

Cite this article:

Xin ZHANG,Jiawen JIAN,Han JIN, et al. Nested microring resonator with a doubled free spectral range for sensing application[J]. Front. Optoelectron., 2017, 10(2): 144-150.

URL:

https://academic.hep.com.cn/foe/EN/10.1007/s12200-017-0670-3
https://academic.hep.com.cn/foe/EN/Y2017/V10/I2/144

Fig.1 Schematic of (a) the nested microring and (b) the cross-section of its waveguide

Fig.2 Output spectra of Port Through and Port Out for the proposed structure (a) and (b) and the conventional structure (c) and (d)

Fig.3 Output spectra of the proposed structure with different positions for communication: port In and port Through (a) and (d) in different waveguides; (b) and (c) in same waveguide

Fig.4 Output spectra of the proposed structure (a) in different phase shifts (b)

Fig.5 Output spectra of the proposed structure in the different coupling coefficients. (a) shows the output spectra when the coupling coefficients of the waveguide-to-waveguide section are selected at 0.5, 0.2, and 0.05, respectively, and the coupling coefficient of the ring-to-waveguide sections is maintained at k = 0.2; (b) represents the output spectra of Port Through. The coupling coefficient of the waveguide-to-waveguide section is maintained at 0.2, and the coupling coefficients of the ring-to-waveguide are 0.5, 0.2, and 0.05

Fig.6 Redshift of the resonant notch in the output spectrum with increasing n

Fig.7 Sensitivity curve of the sensor

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