Optical Filter Design Based on Cascaded Double-Ring-Assisted Mach-Zehnder Interferometers with Bandwidth Tuning Capability

Mingbin Lai; Minming Geng; Yixuan Tan; Yao Feng; Wancai He; Jia Jiang; Qiang Liu; Zhenrong Zhang

doi:10.3788/AOS230431

Acta Optica Sinica, Volume. 43, Issue 11, 1113003(2023)

Optical Filter Design Based on Cascaded Double-Ring-Assisted Mach-Zehnder Interferometers with Bandwidth Tuning Capability

Mingbin Lai^1,2, Minming Geng^1,2,3,4、*, Yixuan Tan^1,2, Yao Feng^1,2, Wancai He^1,2, Jia Jiang^1,2, Qiang Liu^1,2, and Zhenrong Zhang^1,2

Author Affiliations

¹School of Computer, Electronics and Information, Guangxi University, Nanning 530004, Guangxi, China

²Guangxi Key Laboratory of Multimedia Communications and Network Technology, Nanning 530004, Guangxi, China

³Key Laboratory of Multimedia Communications and Information Processing of Guangxi Higher Education Institutes, Nanning 530004, Guangxi, China

⁴Guangxi Experiment Center of Information Science, Guilin 541004, Guangxi, China

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Figures & Tables(16)

Fig. 1. Schematic of proposed filter consisting of cascaded double-ring-assisted MZI

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Fig. 2. Influence of the initial phase of $L_{1}$ on the performance of the unit filter

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Fig. 3. Influence of initial phase of $L_{3}$ on the performance of optical filter

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Fig. 4. Influence of $c_{3}$ and $c_{4}$ on output performance of one-stage microring-assisted MZI and cascaded microring-assisted MZI. (a) Passband loss; (b) stopband extinction ratio; (c) shape factor; (d) bandwidth tuning range of cascaded filters

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Fig. 5. Numerical analysis results of one-stage double-ring-assisted MZI filter. (a) Spectral response; (b) zero-pole plot

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Fig. 6. Numerical analysis results of cascaded double-ring-assisted MZI filter. (a) Spectral response; (b) zero-pole plot

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Fig. 7. Influence of the relationship between $θ_{5}$ and $θ_{6}$ on center wavelength tuning

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Fig. 8. Normalized center frequency shifted with phase change of microring resonators

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Fig. 9. Structure of race-track microring resonator

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Fig. 10. Relationship between initial phase of big ring and $Δ n$

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$Filter bandwidth tunning results. (a) Output bandwidth of filter changed with refractive index of microring; (b) stopband extinction ratio, passband loss, and shape factor under different output bandwidths$

Fig. 11. Filter bandwidth tunning results. (a) Output bandwidth of filter changed with refractive index of microring; (b) stopband extinction ratio, passband loss, and shape factor under different output bandwidths

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Fig. 12. Center wavelength tuning results of cascaded double-ring-assisted MZI filter. (a) Spectral response; (b) changes in shape factor and 3 dB bandwidth

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Fig. 13. Output results of filter with deviation in waveguide width $W_{i d t h}$ of microring and its corresponding coupling arm

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Fig. 14. Output results of the filter with deviation in the coupling gap $G_{a p}$

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Table 1. Parameters of cascaded double-ring-assisted MZI filter

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Table 1. Parameters of cascaded double-ring-assisted MZI filter

Item	Value	Item	Value
Waveguide type	Channel	$R_{B}$ / $μ m$	10
Waveguide height / $μ m$	0.22	$R_{S}$ / $μ m$	5
Refractive index of silicon	3.477	$W_{i d t h}$ / $μ m$	0.4
Refractive index of silica	1.444	$G_{a p}$ / $μ m$	0.13
Polarization	TE	$l_{B}$ / $μ m$	15.34
$L_{B}$ / $μ m$	2.1	$l_{S}$ / $μ m$	3.92
$L_{S}$ / $μ m$	4.8

Table 2. Performance comparison of bandwidth-adjustable filters with different structures

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Table 2. Performance comparison of bandwidth-adjustable filters with different structures

Scheme	Max bandwidth /nm	FSR /nm	Tunable bandwidth /nm	SER /dB	Ref.
Two-stage cascaded MRR-MZI	5	11.55	1.5-5	22.7-37	This work
Three-stage MRR- MZI（six rings）	0.113 （simulation）	0.2336 （simulation）	0.011-0.114 （simulation）	23-54 （simulation）	［24］
Second-order micro-ring	0.824	1.73	0.072-0.824	10-18	［25］
Multiple micro-ring based Vernier filter	1.2	>40	0.3-1.2	17-21	［26］
MRR-MZI	1.35	9	0.3-1.35	>20	［27］

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Mingbin Lai, Minming Geng, Yixuan Tan, Yao Feng, Wancai He, Jia Jiang, Qiang Liu, Zhenrong Zhang. Optical Filter Design Based on Cascaded Double-Ring-Assisted Mach-Zehnder Interferometers with Bandwidth Tuning Capability[J]. Acta Optica Sinica, 2023, 43(11): 1113003

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Paper Information

Category: Integrated Optics

Received: Jan. 2, 2023

Accepted: Feb. 20, 2023

Published Online: Jun. 13, 2023

The Author Email: Geng Minming (gengmm@gxu.edu.cn)

DOI:10.3788/AOS230431

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology