<s>
Fiber-optic	B-Device
filter	I-Device
is	O
an	O
optical	B-Architecture
fiber	I-Architecture
instrument	O
used	O
for	O
wavelength	O
selection	O
,	O
which	O
can	O
select	O
desired	O
wavelengths	O
to	O
pass	O
and	O
reject	O
the	O
others	O
.	O
</s>
<s>
Optical	O
multiplexers	O
(	O
couplers	O
)	O
makes	O
different	O
wavelength	O
coupling	O
into	O
an	O
optical	B-Architecture
fiber	I-Architecture
and	O
different	O
wavelength	O
carries	O
different	O
information	O
.	O
</s>
<s>
At	O
the	O
receiving	O
end	O
,	O
if	O
you	O
want	O
to	O
separate	O
desired	O
wavelengths	O
from	O
optical	B-Architecture
fiber	I-Architecture
,	O
it	O
is	O
necessary	O
to	O
use	O
optical	O
filter	O
.	O
</s>
<s>
FTTX	B-Architecture
optical	B-Architecture
fiber	I-Architecture
communication	O
systems	O
,	O
WDM	B-Architecture
system	O
,	O
LAN	B-General_Concept
,	O
CATV	B-Protocol
,	O
fiber	B-Architecture
optic	I-Architecture
sensing	O
,	O
fiber	O
amplifiers	O
,	O
fiber	B-Device
laser	I-Device
,	O
measuring	O
instruments	O
,	O
medical	O
equipment	O
.	O
</s>
<s>
Mixed	O
wavelengths（λ1、λ2、λ3）from	O
optical	B-Architecture
fiber	I-Architecture
,	O
After	O
the	O
collimating	O
lens	O
(	O
L1	O
)	O
post-directed	O
to	O
the	O
grating，the	O
optical	O
signals	O
of	O
different	O
wavelengths	O
due	O
to	O
the	O
different	O
diffraction	O
angle	O
,	O
is	O
focused	O
to	O
different	O
position	O
through	O
the	O
lens	O
(	O
L2	O
)	O
,	O
then	O
the	O
optical	O
signal	O
is	O
coupled	O
into	O
different	O
optical	B-Architecture
fiber	I-Architecture
for	O
output	O
.	O
</s>
<s>
Prism	O
spectroscopic	O
principle	O
as	O
shown	O
in	O
drawings	O
,	O
Its	O
working	O
principle	O
is	O
:	O
Contains	O
more	O
than	O
one	O
optical	O
signal	O
wavelength	O
of	O
light	O
,	O
As	O
a	O
result	O
of	O
Lens	O
collimator	O
,	O
separated	O
the	O
light	O
through	O
the	O
prism	O
,	O
After	O
the	O
separation	O
of	O
light	O
through	O
another	O
lens	O
is	O
focused	O
and	O
coupled	O
into	O
the	O
corresponding	O
optical	B-Architecture
fiber	I-Architecture
in	O
the	O
spread	O
.	O
</s>
