53-11Optical Loss
53.3.3 Intrinsic Fiber Losses
Intrinsic ber losses are those associated with the ber-optic material itself and are considered the pri-
mary
sou
rce
of at
tenuation
. e
re
is no wa
y
to el
iminate
al
l
im
purities
in b
er
op
tics
ev
en
wi
th
a pr
ecise
ma
nufacturing
pr
ocess
. e to
tal
lo
ss
is pr
oportional
to th
e
b
er
le
ngth
L an
d
th
e
at
tenuation
co
ecient
α is ex
pressed
in dec
ibels
pe
r
ki
lometer
of b
er
. In
trinsic
b
er
lo
sses
ar
e
ma
inly
ca
used
by ab
sorption
an
d
sc
attering
bec
ause
sc
attering
an
d
ab
sorption
oc
cur
wh
en
li
ght
wa
ve
sig
nals
in
teract
wi
th
im
purities
in the ber.
53
.3.3.1
Ma
terial
Abs
orption Losses
Absorption
is th
e
ma
in
sou
rce
of in
trinsic
lo
ss
in op
tical
b
ers,
wh
ich
ca
uses
at
tenuation
by co
nverting
op
tical
po
wer
in
to
vi
bration ...