
53-21Optical Loss
In addition to acceptance tests, bers undergo other tests such as pull strength, breaking, humid-
ity
re
sistance,
pr
olonged
te
nsion,
an
d
be
nd
te
sts
. Co
nnectors,
sp
litters,
co
mbiners,
an
d
b
er
am
pliers
ne
ed
to b
e
t
ested
f
requently
to m
inimize
p
ower
t
ransmission
l
osses
.
In al
most
al
l
b
er
opt
ics,
lo
w
no
ise
an
d
ve
ry
se
nsitive
ph
otodetectors
ar
e
us
ed
in me
asurements
.
Se
miconductor
ph
otodiodes
ma
de
fr
om
sil
icon
ar
e
su
itable
fo
r
me
asurements
wi
th
wa
velengths
be
low
1μm. Fo
r
la
rger
wa
velengths,
ot
her
de
tectors
ar
e
us
ed,
su
ch
as th
ose
ma
de
of ge
rmanium
. Se
miconductor
ph
otodiodes
wo
rk
vi
a
th
e
in
ternal
ph
otoelectric
e
ect;
th
at
is
,