Characterizing microring resonators using optical frequency domain reflectometry

Xiaopei Zhang; Xiaopei Zhang; Yuexin Yin; Xiaojie Yin; Xiaojie Yin; Yongqiang Wen; Xiaolei Zhang; Xiaoping Liu; Xiaoping Liu; Haibin Lv; Haibin Lv; Haibin Lv

doi:10.1364/OL.425681

Optics Letters
Vol. 46,
Issue 10,
pp. 2400-2403
(2021)
•https://doi.org/10.1364/OL.425681

Characterizing microring resonators using optical frequency domain reflectometry

Xiaopei Zhang, Yuexin Yin, Xiaojie Yin, Yongqiang Wen, Xiaolei Zhang, Xiaoping Liu, and Haibin Lv

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Xiaopei Zhang, Yuexin Yin, Xiaojie Yin, Yongqiang Wen, Xiaolei Zhang, Xiaoping Liu, and Haibin Lv, "Characterizing microring resonators using optical frequency domain reflectometry," Opt. Lett. 46, 2400-2403 (2021)

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Table of Contents Category
- Optical Sensors, Measurements, and Metrology
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About this Article
History
- Original Manuscript: March 23, 2021
- Revised Manuscript: April 17, 2021
- Manuscript Accepted: April 18, 2021
- Published: May 6, 2021

Abstract

A novel, to the best of our knowledge, method to extract optical microring resonators’ loss characteristics is proposed and demonstrated using optical frequency domain reflectometry (OFDR). Compared with the traditional optical transmission measurement method, the spatial-resolved backscattering optical signals obtained from the OFDR can clearly show the resonance mode’s increased optical path length due to its circulation inside the resonator. By further processing the backscattered optical signals, loaded $Q$-factors of several resonators can be accurately determined. A calculation model is proposed to derive the resonance mode’s intrinsic $Q$-factor from OFDR measurements of a series of loaded resonators.

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Data Availability

Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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MRR Number	1	2	3
Coupling gap (µm)	3.9	4.1	4.5
$λ_{0}$ (nm)	1530.78	1530.78	1530.79
Trans. method ( $\times 1 0^{6}$ )	1.34	3.46	5.51
OFDR method ( $\times 1 0^{6}$ )	$1.36 \pm 0.06$	$3.42 \pm 0.12$	$5.59 \pm 0.11$

MRR Number	1	2	3
Intercept (dB)	−98.5	−104.4	−109.7
Trans. method ( $\times 1 0^{6}$ )	7.62	7.64	7.56
Calculated with MRR1 ( $\times 1 0^{6}$ )	—	$7.59 \pm 0.19$	$7.59 \pm 0.25$
Calculated with MRR2 ( $\times 1 0^{6}$ )	$7.59 \pm 0.19$	—	$7.58 \pm 0.22$
Calculated with MRR3 ( $\times 1 0^{6}$ )	$7.59 \pm 0.25$	$7.58 \pm 0.22$	—

MRR Number	1	2	3
Coupling gap (µm)	3.9	4.1	4.5
$λ_{0}$ (nm)	1530.78	1530.78	1530.79
Trans. method ( $\times 1 0^{6}$ )	1.34	3.46	5.51
OFDR method ( $\times 1 0^{6}$ )	$1.36 \pm 0.06$	$3.42 \pm 0.12$	$5.59 \pm 0.11$

MRR Number	1	2	3
Intercept (dB)	−98.5	−104.4	−109.7
Trans. method ( $\times 1 0^{6}$ )	7.62	7.64	7.56
Calculated with MRR1 ( $\times 1 0^{6}$ )	—	$7.59 \pm 0.19$	$7.59 \pm 0.25$
Calculated with MRR2 ( $\times 1 0^{6}$ )	$7.59 \pm 0.19$	—	$7.58 \pm 0.22$
Calculated with MRR3 ( $\times 1 0^{6}$ )	$7.59 \pm 0.25$	$7.58 \pm 0.22$	—

Abstract

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Equations (7)

Optics Letters