Efficient planar fiber-to-chip coupler based on two-stage adiabatic evolution

Khilo, Anatol; Popović, Miloš A.; Araghchini, Mohammad; Kärtner, Franz X.

doi:10.1364/oe.18.015790

Cited by 63 publications

(22 citation statements)

References 33 publications

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“…An error of only 1 nm in the average waveguide width produces indeed a shift of the ring resonance of about 125 GHz [65]. Moreover, with state-of-theart SOI technology, silicon nanometric waveguides exhibit propagation losses of about 1-2 dB/cm [117] and a challenging fiber-to-waveguide coupling that can be reduced down to 1-2 dB/facet only by means of complex mode-adapting structures [118][119][120].…”

Section: Soi Technologymentioning

confidence: 99%

The first decade of coupled resonator optical waveguides: bringing slow light to applications

Morichetti

Ferrari

Canciamilla

et al. 2011

Laser & Photonics Reviews

156

125

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A century after the first optical cavity, coupled resonator optical waveguides (CROWs) were conceived as a new way to guide light on a photonic chip. Controlling chains of coupled resonators to let light propagate through, with a reduced speed and enhanced intensity, boosting light-matter interaction while keeping information undistorted: this was the fascinating promise of CROWs, but also one of the most ambitious challenges ever set for integrated optics. The first decade of the history of CROWs is discussed in this review, from the original idea to recent applications, panning through the technological platforms that have been employed to realize these structures. Design criteria and management issues, fundamental limits, and sensitivity to fabrication tolerances are discussed to make the reader aware of the performance of state-of-the-art CROWs and to provide a realistic perspective of future applicative horizons.

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Section: Soi Technologymentioning

confidence: 99%

The first decade of coupled resonator optical waveguides: bringing slow light to applications

Morichetti

Ferrari

Canciamilla

et al. 2011

Laser & Photonics Reviews

156

125

View full text Add to dashboard Cite

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“…The injector waveguide comprises a 3.5-µm-thick layer of siliconrich oxide with a specific refractive index by controlling the amount of silicon nanocrystals. Khilo et al 15 reported a coupler based on combination of rib and inverse tapers. First, the light is coupled into a low-index rib waveguide.…”

Section: Introductionmentioning

confidence: 99%

Fiber-chip edge coupler with large mode size for silicon photonic wire waveguides

Pápeš

Cheben

et al. 2015

SPIE Proceedings

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Fiber-chip edge couplers are extensively used in integrated optics as one of the key structures for coupling of light between planar waveguide circuits and optical fibers. In this work, a new fiber-chip edge coupler concept with large mode size for coupling to submicrometer silicon photonic wire waveguides is presented. The coupler allows direct coupling to conventional SMF-28 optical fiber and circumvents the need for lensed fibers. We demonstrate by simulations a 95% mode overlap between the mode at the chip facet and a high numerical aperture single mode optical fiber with 6 µm mode field diameter (MFD). We also demonstrate a modified design with 89% overlap between the mode at the chip facet and a standard SMF-28 fiber with 10.4 µm MFD. The coupler is designed for 220 nm silicon-oninsulator (SOI) platform. An important advantage of our coupler is that large mode size is obtained without the need to increase buried oxide (BOX) thickness, which in our design is set to 3 µm. This remarkable feature is achieved by implementing in the SiO 2 upper cladding two thin high-index Si 3 N 4 layers. The high-index layers increase the effective refractive index of the upper cladding layer near the facet and are gradually tapered out along the coupler to provide adiabatic mode transformation to the silicon wire waveguide. Simultaneously, the Si-wire waveguide is inversely tapered along the coupler. The mode overlap at the chip facet is studied using a vectorial 2D mode solver and the mode transformation along the coupler is studied by 3D Finite-Difference Time-Domain simulations. The couplers are optimized for operating with transverse electric (TE) polarization and the operating wavelength is centered at 1.55 µm.

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“…First, its compliant aspect mechanically decouples the chip optical interface from cycling strains in the package, which is expected to significantly improve long-term reliability when compared to solutions employing rigid interfaces or direct fiber to chip [3][4]. Second, its optical bandwidth can be very large.…”

Section: Introductionmentioning

confidence: 99%

Optical Demonstration of a Compliant Polymer Interface between Standard Fibers and Nanophotonic Waveguides

Barwicz

Taira

Takenobu

et al. 2015

Optical Fiber Communication Conference

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Efficient planar fiber-to-chip coupler based on two-stage adiabatic evolution

Cited by 63 publications

References 33 publications

The first decade of coupled resonator optical waveguides: bringing slow light to applications

The first decade of coupled resonator optical waveguides: bringing slow light to applications

Fiber-chip edge coupler with large mode size for silicon photonic wire waveguides

Optical Demonstration of a Compliant Polymer Interface between Standard Fibers and Nanophotonic Waveguides

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