A compact photonic horizontal spot-size converter realized in silicon-on-insulator

Luyssaert, Bert; Vandersteegen, Peter; Taillaert, Dirk; Dumon, Pieter; Bogaerts, Wim; Bienstman, Peter; Thourhout, Dries Van; Wiaux, Vincent; Beckx, S.; Baets, Roel

doi:10.1109/lpt.2004.838655

Cited by 28 publications

(25 citation statements)

References 9 publications

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“…In Section IV, a short discussion and conclusion follows. have led to an improved efficiency when compared with a linear taper [10]. These structures have been designed using the same method as described in Section II, but with different widths for the input and output waveguide and with the lengths of the various waveguide segments not fixed, but also parameters to be optimized.…”

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confidence: 99%

Efficient nonadiabatic planar waveguide tapers

Luyssaert

Bienstman

Vandersteegen

et al. 2005

J. Lightwave Technol.

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Abstract-We report taper designs with high transmission efficiencies and with lengths shorter than those needed for adiabatic operation. The tapering occurs between rectangular optical waveguides with the same vertical silicon-on-insulator layer structure, but with different horizontal widths, namely 0.5 and 2.0 µm, and for taper lengths between 0.5 and 3.0 µm. After a comparison between two different optimization methods in a two-dimensional calculation scheme, one of these is repeated using three-dimensional calculations. The results show that, also in the length region where conventional linear and parabolic tapers are not yet adiabatic, tapers with a high efficiency can be designed by applying complex taper structures with more degrees of freedom.

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mentioning

confidence: 99%

Efficient nonadiabatic planar waveguide tapers

Luyssaert

Bienstman

Vandersteegen

et al. 2005

J. Lightwave Technol.

Self Cite

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“…This method showed an improvement in coupling efficiency from fiber to a waveguide, but 5-micron mode field diameter is still very large in comparison with mode filed diameters of many integrated optical waveguides. Several configurations have been proposed for improving fiber-to-waveguide coupling efficiency in very small size waveguides such as grating coupler [16][17][18], micro-ring vertical coupler [19], parabolic reflector [20], and tapered waveguides [21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Laser beam shaping and mode conversion in optical fibers

Mayeh

Farahi

2011

Photonic Sens

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A new class of all-fiber beam shaping devices has been realized by inverse etching the end face of single mode and multimode fibers to form a concave cone tip. Concave tip fiber can convert a Gaussian beam profile to a flat top beam profile with a uniform intensity distribution. A flat top beam with intensity variation of approx. 5% and flat top diameter to spot diameter ratio of 67% has been achieved. This device can also change the beam shape from a Gaussian to a donut by moving the observation plane. A flat top multimode fiber beam delivery is attractive for applications which require high power and uniform intensity distribution. In single mode fiber, concave tips could be used to reduce the beam spot size diameter, enabling efficient light coupling from a single mode fiber to an integrated optical waveguide.

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“…We have demonstrated a compact interface from a fiber to a photonic wire, 5 using both a grating couplers, which can be combined with short multimode interferometric tapers. 6,7 In this paper we give an overview of our work in silicon-on-insulator (SOI) nanophotonic waveguide structures. First, we describe some basic properties of nanophotonic waveguides.…”

Section: Introductionmentioning

confidence: 99%

Silicon-on-insulator nanophotonics

et al. 2005

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Nanophotonics promise a dramatic scale reduction compared to contemporary photonic components. This allows the integration of many functions onto a chip. Silicon-on-insulator (SOI) is an ideal material for nanophotonics. It consists of a thin layer of silicon on top of an oxide buffer. In combination with high-resolution lithography, one can define a high refractive index contrast both in horizontally and vertically, resulting in a tight confinement of light. Moreover, SOI can be processed with industrial tools now used for silicon microelectronics. There are two candidates for nanophotonic waveguides. Photonic wires are basically conventional waveguides with reduced dimensions and a high refractive index contrast. These waveguides with submicron dimensions can have bend radii of only a few micrometers. The alternative is to use photonic crystals, which confine light by the photonic band gap effect. Introducing defects in a photonic crystal creates waveguides and other functional components. To make nanophotonics commercially viably, mass-manufacturing technology is needed. While e-beam lithography delivers the required accuracy for nanophotonic structures, it is too slow. We have used deep-UV lithography, used for advanced CMOS fabrication, to make nanophotonic waveguides. The fabrication quality is very good, which translates to low propagation losses. E.g. a 500nm (single-mode) photonic wire has a propagation loss of only 0.24dB/mm. Using these low-loss waveguides, we have implemented a variety of nanophotonic components, including ring resonators and arrayed waveguide gratings.

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A compact photonic horizontal spot-size converter realized in silicon-on-insulator

Cited by 28 publications

References 9 publications

Efficient nonadiabatic planar waveguide tapers

Efficient nonadiabatic planar waveguide tapers

Laser beam shaping and mode conversion in optical fibers

Silicon-on-insulator nanophotonics

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