A hollow-core tube layout uses inhibited coupling to cut fundamental-mode loss while filtering higher-order modes for single-mode propagation.
Stress elements placed outside the signal region align all core polarization axes while avoiding pump absorption loss in high-power fiber lasers.
Solid-inclusion cladding enables broadband light delivery with standard connector coupling, low loss, and stronger fiber handling.
A thin dielectric coating inside a smooth metal waveguide enables low-loss HE11 transmission above 300 GHz without corrugated-wall complexity.
Cores arranged along isotherms and housed in isotropic cooling reduce thermal delay mismatch and improve coherent beam recombination.
An annular tube layout uses inhibited coupling to cut fundamental-mode loss while suppressing higher modes across a broad wavelength range.