Grating coupler

Off-resonance light incident on the grating behaves almost the same as it would if it was incident in an area where there is no grating. Waveguides are usually made of dielectric and are . In particular we will focus on grating couplers. Both grating couplers and fiber-chip edge couplers are commonly used in integrated optics for coupling light between planar SOI waveguides and optical fibers.

Today we will cover the theory of grating couplers.

Frederik VAN LAERE, Melanie AYRE.

Dries VAN THOURHOUT, Peter BIENSTMAN and Roel BAETS.

Photonics Research Group, Department of Information Technology, Ghent . We observe that the bandwidth behavior is not only determined by the grating coupler intrinsic properties, but also affected by the fiber parameters such as position, beam waist and Numerical . Adding this poly- Silicon layer reshapes the grating structure which changes its diffraction properties. SILICON GRATING COUPLERS FOR LOW LOSS COUPLING BETWEEN. OPTICAL FIBER AND SILICON NANOWIRES. Requirements for the Degree of. Master of Science in Electrical and Computer Engineering.

THEORY, DESIGN, AND FABRICATION OF. A thesis submitted to the faculty of. Brigham Young University in partial fulfillment of the requirements for the degree of. Abstract: We have designed and fabricated an out-of-plane coupler for butt- coupling from fiber to compact planar waveguides.

The coupler is optimized using mode expansion-based simulations. The advantage of this device is that it does not require . It is well known that photoresist gratings can be used for coupling light into and out of optical waveguides. The grating is etched completely through the silicon device layer, thus permitting the fabrication of through-etched . Distributed Bragg reflectors as bottom mirrors are employed to improve the coupling efficiency by reflecting the downward traveling light. The bandwidth of planar waveguide grating couplers is theoretically investigated based on the rigorous grating theory. The peak coupling efficiency obtained is about −2.

The forked grating coupler (FGC) is an optical vortex interface for silicon photonics. Design methodologies are given, as well as measured . Introduction In this 3D example, we use the optimized grating parameters including pitch and duty cycle from the 2D grating coupler simulation, use the circular etch lines to.