Selective mode excitation in hollow-core photonic crystal fiber.
Modes are selectively excited by launching light through the cladding from the side into a hollow-core photonic crystal fiber. Measuring the total output power at the end of the fiber as a function of the angle of incidence of the exciting laser beam provides a powerful diagnostic for characterizing the cladding bandgap. Furthermore, various types of modes on either side of the bandgap are excited individually, and their near-field images are obtained.
Galea
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Blazephotonics, Ltd., University of Bath Campus, Claverton Down, Bath BA2 7AY, UK.
Couny
F
F
Coupland
S
S
Roberts
P J
PJ
Sabert
H
H
Knight
J C
JC
Birks
T A
TA
Russell
P St J
PS