<s>
For	O
an	O
optical	B-Architecture
fiber	I-Architecture
or	O
waveguide	O
,	O
a	O
radiation	B-Device
mode	I-Device
or	O
unbound	B-Device
mode	I-Device
is	O
a	O
mode	O
which	O
is	O
not	O
confined	O
by	O
the	O
fiber	O
core	O
.	O
</s>
<s>
Radiation	B-Device
modes	I-Device
correspond	O
to	O
refracted	O
rays	O
in	O
the	O
terminology	O
of	O
geometric	O
optics	O
.	O
</s>
