Now showing items 1-8 of 8
Vertical coupling for silicon nitride waveguides using silicon grating couplers and transitions
Fiber to silicon nitride waveguides coupling is achieved using silicon grating coupler with a transition. Two optimized couplers are designed for TE and TM mode excitation, achieving over 55% efficiency. Fabrication issues ...
Tolerant wideband high-efficiency grating coupler for TM mode excitation
An optimized grating coupler featuring both ultra-broad bandwidth and high-efficiency has been achieved for the first time for the +1 diffraction order at a central operating wavelength 1.55 μm for TM polarization in ...
Design for broadband high-efficiency grating couplers
In this Letter, we propose general optimization methods to design broadband high-efficiency grating couplers for planar waveguides. We attribute the coupling bandwidth to the mismatch of effective indices between the ...
Long period grating cascaded to photonic crystal fiber modal interferometer for simultaneous measurement of temperature and refractive index
We propose and demonstrate a novel and simple dual-parameter measurement scheme based on a cascaded optical fiber device of long-period grating (LPG) and photonic crystal fiber (PCF) modal interferometer. The temperature ...
Highly compact ultra-low loss polarization insensitive 1-to-2 multimode interference splitter
We experimentally demonstrated a highly compact 1-to-2 multimode interference splitter to achieve polarization insensitive ultra-low loss behavior. The excess loss is 0.112 dB and 0.184 dB for TE and TM mode, respectively.
Mode control in planar waveguide grating couplers with double surface corrugation
Grating couplers with double surface corrugation are proposed to adjust the resonance behavior of both TE and TM modes simultaneously. Through proper selection of parameters, we designed a polarization-independent grating ...
Radially graded index whispering gallery mode resonator for penetration enhancement
This paper theoretically analyzes a hollow cylindrical whispering gallery mode resonator with radially inhomogeneous cladding. We propose an index profile of n(r) = b/r to enhance field penetration towards the resonator ...
Whispering gallery mode excitation and collection using fused-tapered fiber tips
In this paper, we investigated whispering gallery mode (WGM) coupling in fused silica microspheres using fused-tapered fiber tips (FTFT). FTFT couplers are fabricated from single mode fibers using a standard splicing ...