Attari, "A 60[degrees] photonic crystal waveguide bend
with improved transmission characteristics," Optica Applicata, vol.
1) The reflections from the waveguide bend
and the beam tunnel are negligible.
This article describes a waveguide bend
system that preserves amplitude and phase for all polarizations over a very wide frequency range.
The optical arc sensor is attached to a waveguide bend
that is located near the output of the klystron.
Lipson, "On-chip transformation optics for multimode waveguide bends
," Nature Commun., Vol.
Most of the power loss happens during the waveguide bends
, hence wide-angle branching waveguide needs to be designed as small as possible to avoid power loss.
The feeding waveguide bends
contribute to the overall mismatch, so trimming of either side walls or the partition between two waveguides and tuning screw adjusting, all affect the coupling opening resonant frequency, and may significantly compensate the input and output mismatch and result in the performance shown previously.
Salah-Belkhodja, "Improved transmission waveguide bends
in photonic crystal," Journal of Electromagnetic Waves and Applications, Vol.
The junctions can simply be asymmetric junction offsets, if the attenuation band is of interest, or H-plane waveguide bends
designed for the pass-band, if both the pass-band and attenuation bands are of interest.
The researchers are now working to develop highly efficient waveguide bends
for signal routing and optical interconnect applications.