Design and optimization of subwavelength silicon photonics edge coupler for cleaved fibers

Moura, Uiara Celine de; Bustamante, Yesica R. R.; Farias, Giovanni B. de; Snyder, Bradley; Miller, Andy; Campenhout, Joris Van; Absil, P.

doi:10.1109/sbfoton-iopc.2018.8610893

Cited by 5 publications

(4 citation statements)

References 16 publications

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“…SWG is a kind of grating structure with the pitch is much smaller than the wavelength, and its pitch is small enough to suppress the diffraction effect arising from the periodicity of the structure [47]. It has been widely demonstrated that SWG structure can be used to enhance coupling efficiency [39,42,[47][48][49]. Yaqian Li et al demonstrated an integrated edge coupler embedded with both SWG waveguide and suspended structure based on the Si-SiN hybrid photonic platform, and the corresponding coupling loss of the TE/TM mode is 0.86 dB/0.94 dB [39].…”

Section: ⅲ Further Increasing Coupling Efficiency With Sin Swg Edge C...mentioning

confidence: 99%

Broadband Polarization-Independent Edge Couplers With High Efficiency Based on SiN-Si Dual-Stage Structure

Jiang,

Zhang,

Liu

2024

IEEE Photonics J.

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Silicon nitride (SiN) plays a critical role in silicon photonics because of its lower refractive index, low waveguide loss, broad operating bandwidth and compatibility with complementary metal oxide semiconductor (CMOS) fabrication process. Here, we propose a polarization-independent subwavelength grating (SWG) edge coupler with high efficiency based on SiN-Si dual-stage structure with a length of only 315.8 μm. Such a structure can be fabricated on 8-inch silicon photonics pilot lines and doesn't require special fabrication processes for making it suspended. We simulate the minimum TE/TM light coupling loss from a standard SMF-28 fiber to be 0.61 dB/0.95 dB with polarization dependent loss (PDL) less than 0.4 dB in the whole band between 1500 nm and 1600 nm.

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Section: ⅲ Further Increasing Coupling Efficiency With Sin Swg Edge C...mentioning

confidence: 99%

Broadband Polarization-Independent Edge Couplers With High Efficiency Based on SiN-Si Dual-Stage Structure

Jiang,

Zhang,

Liu

2024

IEEE Photonics J.

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“…Robust edge couplers are desired for high-volume production. An SWG-based edge coupler for coupling to high-numerical-aperture optical fibers was proposed theoretically with high tolerance to fiber misalignment (±1.5 μm for a 1-dB excess loss) [107]. Subwavelength grating mode converters are also used for optical chip-to-chip connections.…”

Section: Swg Couplers For Fiber-chip Interconnectsmentioning

confidence: 99%

Subwavelength structured silicon waveguides and photonic devices

Sun

Zhang

et al. 2020

Nanophotonics

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AbstractSubwavelength structures such as subwavelength gratings (SWGs) and subwavelength metamaterials are capable of tailoring the optical properties of materials and controlling the flow of light at the nanoscale. The effective indices of the subwavelength structured strip and slab waveguides can be changed in a wide range by choosing an appropriate duty cycle or a filling factor of silicon, which provides an effective method to manipulate the optical field and achieve effective index matching for functional devices. Recent advances in nanofabrication techniques have made it possible to implement subwavelength structures in silicon strip and slab waveguides. Here we review various approaches used to design subwavelength structures and achieve exotic optical responses and discuss how these structures can be used to realize high-performance silicon photonic devices. Both one-dimensional SWG devices and two-dimensional subwavelength metamaterial devices are covered in this review, including subwavelength structure–based polarization handling devices, mode manipulation devices, and building blocks for integrated optical interconnects. Perspectives on subwavelength structured silicon photonic devices are also discussed.

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“…Among all the light-coupling approaches, unlike to the edge couplers, surface grating couplers (GCs) were considered as the fundamental passive components, and have been widely explored for highly-efficient interfacing optical fiber to waveguide, especially for the increasing applications of optical waveguide devices and circuits [4][5][6][7]. For the existing researches focused on the waveguide sub-wavelength structures such as the common structures of long-period diffraction gratings, Bragg gratings and short-period subwavelength gratings (SWG), the dispersion relation between frequency (f) and wavenumber () for respective gratings waveguide in the optical integrated devices had been investigated [8][9][10]. It was reported that waveguide SWG can be considered as a low-loss homogeneous medium when the effective wavelength is larger than the period of waveguide SWG [11].…”

Section: Introductionmentioning

confidence: 99%

Highly-efficient thin film LiNbO3 surface couplers connected by ridge-waveguide subwavelength gratings

Yang

et al. 2021

J Mater Sci: Mater Electron

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The ridge waveguide integrated grating couplers (GCs) in lithium niobate on insulator (LiNbO 3 , LNOI) were designed, fabricated and characterized. Two ends of the gratings structures were connected through the middle photonic rib-waveguide of a sub-micrometric-diameter, which was nanostructured with the geometry of side-wall corrugated subwavelength gratings structure. A high coupling efficiency of -5.1 dB for the best thin film LiNbO 3 (TFLN) grating coupler was measured at the telecommunication wavelength of 1561 nm for quasi-transverse-electric (TE) polarized signals, with a broad 3-dB optical bandwidth of wider than 95 nm. All the devices structure patterns for the integrated LNOI GCs could be simultaneously defined by one step of electron-beam lithography, and then easily fabricated by the dry-etching processes. This compact component exhibited magnificent performance, and might show the potential functionalities for the TFLN-based integrated optical waveguide devices.

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Design and optimization of subwavelength silicon photonics edge coupler for cleaved fibers

Cited by 5 publications

References 16 publications

Broadband Polarization-Independent Edge Couplers With High Efficiency Based on SiN-Si Dual-Stage Structure

Broadband Polarization-Independent Edge Couplers With High Efficiency Based on SiN-Si Dual-Stage Structure

Subwavelength structured silicon waveguides and photonic devices

Highly-efficient thin film LiNbO3 surface couplers connected by ridge-waveguide subwavelength gratings

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