Wavelength-independent all-fiber mode converters.
We have used two different photonic crystal fiber (PCF) techniques to make all-fiber mode converters. An LP(01) to LP(11) mode converter was made by the ferrule technique on a drawing tower, and an LP(01) to LP(02) mode converter was made by controlled hole inflation of an existing PCF on a tapering rig. Both devices rely on adiabatic propagation rather than resonant coupling; so high extinction was achieved across a wide wavelength range.
Lai
K
K
Department of Physics, University of Bath, Claverton Down, Bath, UK.
Leon-Saval
S G
SG
Witkowska
A
A
Wadsworth
W J
WJ
Birks
T A
TA