Design of broadband subwavelength grating couplers with low back reflection

Wang, Yun; Shi, Wei; Wang, Xu; Zheng, Lu; Caverley, Michael; Bojko, Richard; Chrostowski, Lukas; Jaeger, Nicolas A. F.

doi:10.1364/ol.40.004647

Cited by 102 publications

(40 citation statements)

References 20 publications

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“…9. Broadband SWG grating couplers [12] were used to couple the light into and out of the test structures. Identical SWG DCs were used as the power splitter and the combiner in the MZI and were connected by two waveguides with a δL of 250µm.…”

Section: Fabrication and Measurementmentioning

confidence: 99%

“…Sub-wavelength gratings (SWGs) provide the flexibility to engineer both their index profiles and their dispersion properties, and have been used in various silicon-on-insulator (SOI) devices [11], such as power couplers [12] and biosensers [13]. In [14], SWGs were used to engineer the dispersion properties of a conventional DC so that a broad operating bandwidth could be achieved.…”

Section: Introductionmentioning

confidence: 99%

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Compact Broadband Directional Couplers Using Subwavelength Gratings

Wang

Zheng

et al. 2016

IEEE Photonics J.

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We experimentally demonstrate compact, broadband directional couplers using sub-wavelength gratings for silicon-on-insulator wafers with silicon layers of 220nm. The dispersion properties of the optical modes are engineered using sub-wavelength gratings, which allows broadband operation. Finite-difference time-domain based band structure calculations, with significantly reduced simulation time, were used to analyze the design, which included both the structure and the material dispersions. Compact broadband direction couplers, with device lengths shorter than 14µm, which cover a bandwidth of 100nm, for power splitting ratios of 50/50, 40/60, 30/70, and 20/80, are designed and fabricated for the fundamental transverse electric mode with a central operating wavelength of 1550nm.

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Section: Fabrication and Measurementmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Compact Broadband Directional Couplers Using Subwavelength Gratings

Wang

Zheng

et al. 2016

IEEE Photonics J.

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“…Additionally, we extended our method beyond the range of operating parameters in 23 by showing the ability to produce large bandwidth grating couplers at varied incident source angles (Figure 9). Efficiency vs Bandwidth for Varied Source Angle FIG.…”

Section: Methodsmentioning

confidence: 99%

“…Improvements to the broadband properties of grating couplers have been made through rigorous grating diffraction analysis 21,22 and extension of optimization methods to include bandwidth in the figureof-merit. 23,24 . However, these methods tend to add additional constraints on the fabrication and grating parameters, such as requiring multiple device layers or large angle of incidence.…”

Section: Introductionmentioning

confidence: 99%

Inverse Design and Demonstration of Broadband Grating Couplers

Sapra

Vercruysse

et al. 2019

IEEE J. Select. Topics Quantum Electron.

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We present a gradient-based optimization strategy to design broadband grating couplers. Using this method, we are able to reach, and often surpass, a user-specified target bandwidth during optimization. The designs produced for 220 nm silicon-on-insulator are capable of achieving 3 dB bandwidths exceeding 100 nm while maintaining central coupling efficiencies ranging from -3.0 dB to -5.4 dB, depending on partial-etch fraction. We fabricate a subset of these structures and experimentally demonstrate gratings with 3 dB bandwidths exceeding 120 nm. This inverse design approach provides a flexible design paradigm, allowing for the creation of broadband grating couplers without requiring constraints on grating geometry.

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“…Unlike edge couplers, surface grating couplers do not require facet polishing and can be used for wafer-scale testing [8]. However, the radiation angle is strongly wavelength dependent limiting the bandwidth of surface grating couplers [9]. Several alternatives have been proposed to increase surface grating couplers, but generally at the expense of reducing their coupling efficiency.…”

Section: Broadband High-efficiency Zero-order Grating Couplersmentioning

confidence: 99%

Broadband and high-performance devices for the silicon and silicon-nitride platforms

Molina-Fernández

Halir

Ortega‐Moñux

et al. 2017

2017 19th International Conference on Transparent Optical Networks (ICTON)

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Vous avez des questions? Nous pouvons vous aider. Pour communiquer directement avec un auteur, consultez la première page de la revue dans laquelle son article a été publié afin de trouver ses coordonnées. Si vous n'arrivez pas à les repérer, communiquez avec nous à PublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. Questions? Contact the NRC Publications Archive team atPublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. If you wish to email the authors directly, please see the first page of the publication for their contact information. NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. NRC Publications Record / Notice d'Archives des publications de CNRC:http://nparc.cisti-icist.nrc-cnrc.gc.ca/eng/view/object/?id=4d9016ba-d2f8-42be-b035-79ab2a5fa0ff http://nparc.cisti-icist.nrc-cnrc.gc.ca/fra/voir/objet/?id=4d9016ba-d2f8-42be-b035-79ab2a5fa0ff ABSTRACTThe increasing demand for higher data rates and small form factor equipment for optical networks is fuelling research on integrated optical devices with small footprint and broad bandwidth. Here, we present novel design approaches for grating couplers in the silicon and silicon nitride platforms that enable broadband operation and highly efficient coupling. Furthermore, we report experimental findings on compact integrated waveguide splitters that provide virtual perfect performance over more than 300 nm of bandwidth at telecom wavelengths. Keywords: integrated optics, silicon photonics, multimode interference couplers, grating couplers, subwavelength structures INTRODUCTIONOver the last years, the exponential growth of optical networks capacity has increased research in integrated optic technologies beyond the already mature III-V platforms. In this scenario, silicon photonics has emerged as a key technological platform to support the low cost and high performance requirements demanded by telecom and especially datacom networks. Photonic integrated circuits (PICs) with full C band operation are now widespread and there is an increased interest in devices covering several communication bands. Multimode Interference Couplers (MMI) and fiber-to-chip grating couplers are two of the basic building blocks of PICs. Thus improvement in bandwidth, uniformity and efficiency of these devices is a must. In this communication we review several designs of MMIs and grating couplers with improved performance. First, a broadband MMI covering more than 300 nm bandwidth will be presented which is based on a SWG structures to reduce the wavelength dependence of the beat length L π . Then a SWG based zero-order prism-assisted grating coupler will be presented with a 1 dB bandwidth exceeding 125 nm. Finally, we will show how a self-imaging grating can be designed to obtain a highly effi...

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Design of broadband subwavelength grating couplers with low back reflection

Cited by 102 publications

References 20 publications

Compact Broadband Directional Couplers Using Subwavelength Gratings

Compact Broadband Directional Couplers Using Subwavelength Gratings

Inverse Design and Demonstration of Broadband Grating Couplers

Broadband and high-performance devices for the silicon and silicon-nitride platforms

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