Novel spot size converter for coupling standard single mode fibers to SOI waveguides

Sisto, Marco Michele; Fisette, Bruno; Paultre, Jacques-Edmond; Paquet, Alex; Desroches, Yan

doi:10.1117/12.2230739

Cited by 9 publications

(7 citation statements)

References 28 publications

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“…As for the vertical structural transformation of fiber-to-chip edge couplers, the main aim is to enlarge the effective modal area in the vertical direction to achieve a high modal match between the fiber core and the coupler facet. Figure 10 shows an approach to obtain a large effective modal area where multiple waveguides are placed above the Si inverse taper [74,75]. Upper assisting waveguides are usually made of materials with a lower refractive index than silicon such as silicon nitride (SiN) and silicon oxynitride (SiON), which are also well compatible with the typical silicon photonic platform and CMOS fabrication process.…”

Section: Edge Couplers Assisted With Multiple Upper Waveguidesmentioning

confidence: 99%

“…Specifically, a novel spot size converter assisted with multiple upper SiON waveguides for coupling with standard SMF is demonstrated in [75]. Simulations are comprehensively run including detailed discussion about fiber alignment tolerance, robustness to fabrication tolerances, and compatibility with standard microfabrication processes.…”

Section: Appl Sci 2020 10 X For Peer Review 11 Of 29mentioning

confidence: 99%

“…When light propagates in the cascaded multi-stage tapers and arrives at the first taper tip where the toplayer taper ends, light cannot be confined well in the top layer due to a too small cross-section area, and it inclines to transmit into the successive layer below, which has a higher refractive index than the surrounding SiO2 cladding. Likewise, light propagates in the second layer taper for a certain Specifically, a novel spot size converter assisted with multiple upper SiON waveguides for coupling with standard SMF is demonstrated in [75]. Simulations are comprehensively run including detailed discussion about fiber alignment tolerance, robustness to fabrication tolerances, and compatibility with standard microfabrication processes.…”

Section: Edge Couplers Based On Cascaded Multi-stage Tapersmentioning

confidence: 99%

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Edge Couplers in Silicon Photonic Integrated Circuits: A Review

Cheng

et al. 2020

Applied Sciences

163

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Silicon photonics has drawn increasing attention in the past few decades and is a promising key technology for future daily applications due to its various merits including ultra-low cost, high integration density owing to the high refractive index of silicon, and compatibility with current semiconductor fabrication process. Optical interconnects is an important issue in silicon photonic integrated circuits for transmitting light, and fiber-to-chip optical interconnects is vital in application scenarios such as data centers and optical transmission systems. There are mainly two categories of fiber-to-chip optical coupling: off-plane coupling and in-plane coupling. Grating couplers work under the former category, while edge couplers function as in-plane coupling. In this paper, we mainly focus on edge couplers in silicon photonic integrated circuits. We deliver an introduction to the research background, operation mechanisms, and design principles of silicon photonic edge couplers. The state-of-the-art of edge couplers is reviewed according to the different structural configurations of the device, while identifying the performance, fabrication feasibility, and applications. In addition, a brief comparison between edge couplers and grating couplers is conducted. Packaging issues are also discussed, and several prospective techniques for further improvements of edge couplers are proposed.

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Section: Edge Couplers Assisted With Multiple Upper Waveguidesmentioning

confidence: 99%

Section: Appl Sci 2020 10 X For Peer Review 11 Of 29mentioning

confidence: 99%

Section: Edge Couplers Based On Cascaded Multi-stage Tapersmentioning

confidence: 99%

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Edge Couplers in Silicon Photonic Integrated Circuits: A Review

Cheng

et al. 2020

Applied Sciences

163

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“…Recently, explosive growth in data analytics applications such as cloud computing, video streaming and online gaming are leading to a convergence between datacenters and high-performance computing (HPC) systems [1][2][3]. To satisfy such demands, large-scale studies have been developed towards intra-datacenter optical interconnects based on the silicon photonics platform via single mode fibers (SMF) in the last one kilometer [4,5]. The silicon photonics attracts intense interests due to its ultra-compact and low-cost characteristics.…”

Section: Introductionmentioning

confidence: 99%

“…Nevertheless, the device is too long and the fabrication tolerance of Si 3 N 4 layer thickness is low, which make it troublesomely in practice. In order to reduce the edge coupler length, Sisto et al [4] presented a sort of edge coupler based on a cross-like arrangement of SiO x N y waveguides inserted in a SiO 2 cladding region. The device will exhibit 0.7 dB overall loss with a total length of 450 µm, but this is at the expense of high fabrication complexity such as the uniform SiO x N y material growth which is inconveniently available [10,16,17].…”

Section: Introductionmentioning

confidence: 99%

Novel Low-Loss Fiber-Chip Edge Coupler for Coupling Standard Single Mode Fibers to Silicon Photonic Wire Waveguides

et al. 2021

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Fiber-to-chip optical interconnects is a big challenge in silicon photonics application scenarios such as data centers and optical transmission systems. An edge coupler, compared to optical grating, is appealing to in the application of silicon photonics due to the high coupling efficiency between standard optical fibers (SMF-28) and the sub-micron silicon wire waveguides. In this work, we proposed a novel fiber–chip edge coupler approach with a large mode size for silicon photonic wire waveguides. The edge coupler consists of a multiple structure which was fulfilled by multiple silicon nitride layers embedded in SiO2 upper cladding, curved waveguides and two adiabatic spot size converter (SSC) sections. The multiple structure can allow light directly coupling from large mode size fiber-to-chip coupler, and then the curved waveguides and SSCs transmit the evanescent field to a 220 nm-thick silicon wire waveguide based on the silicon-on-insulator (SOI) platform. The edge coupler, designed for a standard SMF-28 fiber with 8.2 μm mode field diameter (MFD) at a wavelength of 1550 nm, exhibits a mode overlap efficiency exceeding 95% at the chip facet and the overall coupling exceeding 90%. The proposed edge coupler is fully compatible with standard microfabrication processes.

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Improved design for SOI based evanescently coupled multilayer spot-size converter

2017

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This is the accepted version of the paper.This version of the publication may differ from the final published version. Permanent repository link AbstractWe report an improved version of a spot size converter (SSC) consisting of a silicon nanowire evanescently coupled to a phase matched Poly Si multilayer structure. With wider transversal dimensions the multilayer structure expands the mode significantly thus increasing the coupling efficiency with the conventional single mode fiber. Detailed optimization process of a 17 layer based SSC is discussed and its coupling efficiency with a high NA fiber of radius 2 μm is obtained as 98% providing only 0.087 dB loss. Vertical alignment tolerance between the optimized SSC and a high NA fiber of radius 2 μm is also shown. This novel design does not consist of a taper and can be fabricated by using CMOS compatible process. It has a short device length and more relaxed alignment tolerances with the fiber. Full vectorial and computationally efficient finite element method and the least squares boundary residual method have been used for the analysis and optimization of the proposed structure.

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Novel spot size converter for coupling standard single mode fibers to SOI waveguides

Cited by 9 publications

References 28 publications

Edge Couplers in Silicon Photonic Integrated Circuits: A Review

Edge Couplers in Silicon Photonic Integrated Circuits: A Review

Novel Low-Loss Fiber-Chip Edge Coupler for Coupling Standard Single Mode Fibers to Silicon Photonic Wire Waveguides

Improved design for SOI based evanescently coupled multilayer spot-size converter

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