Fiber-to-chip coupler designed using an optical transformation
Department of Electrical Engineering and Computer Science, Vanderbilt University, 37235, USA.Optics Express (Impact Factor: 3.49). 06/2012; 20(13):14705-13. DOI: 10.1364/OE.20.014705
An integrated silicon photonics coupler for fiber to waveguide conversion was designed employing a transformation optics approach. Quasi-conformal mapping was used to obtain achievable material properties, which were realized by a distorted hexagonal lattice of air holes in silicon. The coupler, measuring only 10 μm in length and fabricated with a single-step lithography process, exhibits a peak simulated transmission efficiency of nearly 100% for in-plane mode conversion and a factor of 5 improvement over butt coupling for fiber to waveguide mode conversion in experimental testing.
Conference Paper: High Coupling Efficiency Etched Facet Tapers in Silicon[Show abstract] [Hide abstract]
ABSTRACT: We demonstrate etched facet silicon inverse tapers with coupling loss as low as 0.7dB per facet. This taper can be fabricated on a wafer scale enabling mass-production of silicon photonic devices with broadband, high-efficiency couplers.Lasers and Electro-Optics (CLEO), 2012 Conference on; 01/2012
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ABSTRACT: We show that every linear optical component can be completely described as a device that converts one set of orthogonal input modes, one by one, to a matching set of orthogonal output modes. This result holds for any linear optical structure with any specific variation in space and/or time of its structure. There are therefore preferred orthogonal "mode converter" basis sets of input and output functions for describing any linear optical device, in terms of which the device can be described by a simple diagonal operator. This result should help us understand what linear optical devices we can and cannot make. As illustrations, we use this approach to derive a general expression for the alignment tolerance of an efficient mode coupler and to prove that loss-less combining of orthogonal modes is impossible.Optics Express 10/2012; 20(21):23985-93. DOI:10.1364/OE.20.023985 · 3.49 Impact Factor
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ABSTRACT: We show how to design an optical device that can perform any linear function or coupling between inputs and outputs. This design method is progressive, requiring no global optimization. We also show how the device can configure itself progressively, avoiding design calculations and allowing the device to stabilize itself against drifts in component properties and to continually adjust itself to changing conditions. This self-configuration operates by training with the desired pairs of orthogonal input and output functions, using sets of detectors and local feedback loops to set individual optical elements within the device, with no global feedback or multiparameter optimization required. Simple mappings, such as spatial mode conversions and polarization control, can be implemented using standard planar integrated optics. In the spirit of a universal machine, we show that other linear operations, including frequency and time mappings, as well as non-reciprocal operation, are possible in principle, even if very challenging in practice, thus proving there is at least one constructive design for any conceivable linear optical component; such a universal device can also be self-configuring. This approach is general for linear waves, and could be applied to microwaves, acoustics and quantum mechanical superpositions.Photonics Research 06/2013; 1:1 - 15. DOI:10.1364/PRJ.1.000001
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