A Tunable Optical Delay Line Based on Cascaded Silicon Nitride Microrings for Ka-Band Beamforming

Lin, Dongdong; Xu, Xuemeng; Zheng, Pengfei; Yang, Huimin; Hu, Guohua; Cui, Yiping

doi:10.1109/jphot.2019.2941510

Cited by 30 publications

(5 citation statements)

References 24 publications

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“…RIVEN by the demand of new-generation communication and large-scale computing, such as big data, cloud computing, the Internet of Things, artificial intelligence and so on, the silicon photonics has become an attractive and promising solution due to its advantages of small size, low cost and high integration. Basic silicon waveguide components have applications in sensors [1], [2], filters [3], [4], optical switches/modulators [5]- [7], [8], delayer [9], [10], polarization/wavelength/mode (de)multiplexer [11]- [13], and so on. Though have been well investigated, silicon photonics still deserves further study to explore its potentials and applications in broader fields.…”

Section: > Replace This Line With Your Manuscript Id Number (Double-c...mentioning

confidence: 99%

Mutual-Coupling in High-Q Silicon Dual-Concentric Micro-Ring/Racetrack Resonator

Liu

et al. 2022

IEEE Photonics J.

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Micro-ring resonator (MRR) is a key element in integrated optics. The mutual-coupling in dual-concentric MRR has great influence on the resonance output. In this work, high-Q silicon dual-concentric MRR and racetrack resonator have been investigated by the coupled mode theory. The theoretical model is built to explain and alleviate the phenomenon of resonance splitting. CMOS fabrication is adopted for the preparation of dualconcentric MRR and racetrack resonators. The highest Q-factors of dual-concentric MRR and racetrack resonator are measured to be ~9.00×10 4 at 1530.783 nm and ~7.32×10 4 at 1536.596 nm, respectively. The notch depth improvement over 20 dB has been demonstrated on the 5-μm-radius double-ring structure. The experimental results prove that the asymmetry of resonance splitting can be tuned by adjusting the distance between the innerring and outer-ring, as well as the waveguide width. The proposed work has potentials in the design and optimization of dualconcentric ring resonators.

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Section: > Replace This Line With Your Manuscript Id Number (Double-c...mentioning

confidence: 99%

Mutual-Coupling in High-Q Silicon Dual-Concentric Micro-Ring/Racetrack Resonator

Liu

et al. 2022

IEEE Photonics J.

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“…To obtain a large delay with wide operation bandwidth, cascaded ORRs have been proposed. However, the tuning of cascaded ORRs become more difficult as well [ 12 , 13 ]. PhCWs have a compact footprint owing to their strong optical confinement and slow-light effect [ 14 , 15 ].…”

Section: Introductionmentioning

confidence: 99%

Integrated contra-directionally coupled chirped Bragg grating waveguide with a linear group delay spectrum

Gao¹,

Xu²,

Zhu³

et al. 2023

Front. Optoelectron.

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Due to the advantages of low propagation loss, wide operation bandwidth, continuous delay tuning, fast tuning speed, and compact footprints, chirped Bragg grating waveguide has great application potential in wideband phased array beamforming systems. However, the disadvantage of large group delay error hinders their practical applications. The nonlinear group delay spectrum is one of the main factors causing large group delay errors. To solve this problem, waveguides with nonlinear gradient widths are adopted in this study to compensate for the nonlinear effect of the grating apodization on the mode effective index. As a result, a linear group delay spectrum is obtained in the experiment, and the group delay error is halved. Graphical Abstract

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“…Optical delay line is a basic building block of silicon photonics, which enables a number of processing functions in communication [1,2], microwave photonics (MWP) [3] and photonic computing [4,5]. Numerous methods have been used to achieve on-chip true time delay [6][7][8][9][10][11][12][13][14][15]. Generally, the realization of ODL can be classified into two major methods: 1) propagation length variation (L) [9,10], 2) group velocity variation (vg) [6-8, 11, 12, 16].…”

Section: Introductionmentioning

confidence: 99%

“…Even though this method has loose fabrication restraints, a large footprint is inevitable. On the other hand, the group velocity variation method utilizes devices such as microring resonators (MRRs) [15], photonic crystal waveguides (PhCWs) [16] and waveguide Bragg gratings [8,11,12,17]. Among them, ODLs based on MRRs benefit from simple structure, easy fabrication and small footprint, while such ODLs suffer from either limited delay or limited bandwidth, and precise control of multiple MRRs might as well be problematic.…”

Section: Introductionmentioning

confidence: 99%

High linearity optical delay line based on cascaded multimode waveguide Bragg gratings

Yuan¹,

Dong²

2022

Thirteenth International Conference on Information Optics and Photonics (CIOP 2022)

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Optical delay lines (ODLs) have been widely used in data synchronization, wave shaping and phased array. Compared to fiber components or bulk optics ODLs, integrated ODLs feature reduced cost, size, weight and power consumption. Practical applications call for continuously tunable ODLs with broad operating bandwidth, low insertion loss and high group delay linearity. In this paper, we propose and experimentally demonstrate an integrated low-loss high-linearity ODL based on cascaded multimode waveguide Bragg gratings (WBGs). By coupling the input fundamental mode into the reflected TE2 mode, the proposed cascaded second-order WBGs achieved 104 ps group delay over a bandwidth of 7 nm, and the insertion loss of each stage of WBG is about 0.65 dB. Moreover, the application of multimode WBGs and mode demultiplexer allows easy separation of forward and backward propagating wave without introduce extra loss. Our design enables further application as a modular on-chip delay line and can be used in various on-chip systems.

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A Tunable Optical Delay Line Based on Cascaded Silicon Nitride Microrings for Ka-Band Beamforming

Cited by 30 publications

References 24 publications

Mutual-Coupling in High-Q Silicon Dual-Concentric Micro-Ring/Racetrack Resonator

Mutual-Coupling in High-Q Silicon Dual-Concentric Micro-Ring/Racetrack Resonator

Integrated contra-directionally coupled chirped Bragg grating waveguide with a linear group delay spectrum

High linearity optical delay line based on cascaded multimode waveguide Bragg gratings

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