Now showing items 1-10 of 12
Bandwidth analysis of waveguide grating coupler
The bandwidth of planar waveguide grating couplers is theoretically investigated based on the rigorous grating theory. We observe that the bandwidth behavior is not only determined by the grating coupler intrinsic ...
Raman-assisted wavelength conversion in chalcogenide waveguides
We propose and theoretically investigate chalcogenide waveguide as a more energy-efficient platform than silicon waveguide for coherent anti-Stokes Raman scattering (CARS)-based wavelength conversion. 5.5-dB Stokes to ...
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 ...
Novel miniaturized fabry-perot refractometer based on a simplified hollow-core fiber with a hollow silica sphere tip
In this paper, we report and demonstrate a novel miniaturized intrinsic Fabry-Perot interferometer (IFPI) based on a simplified hollow core fiber ended with a hollow silica sphere tip. The hollow core fiber is spliced to ...
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 ...
Simple and compact reflective refractometer based on tilted fiber Bragg grating inscribed in thin-core fiber
A simple and compact reflective refractometer based on a tilted fiber Bragg grating (TFBG) inscribed in an ultra-high photon-sensitive thin-core fiber is proposed and experimentally demonstrated. The reflective refractometer ...