Fiber Optics and Photonics Devices - Seoul National University · 2019. 3. 18. · Fiber Optics and...
Transcript of Fiber Optics and Photonics Devices - Seoul National University · 2019. 3. 18. · Fiber Optics and...
p
s s B
B
,B p s A p s k k k
2 sin( / 2)B A A A pv v k k
/ 2 2 /B B p A pv n v 11.1GHz @ 1.55p m
2
2 2
( / 2)( )
( ) ( / 2)
BB p
B B
g g
/ 2( ) ( )
/ 2 ( )
p B
c s p p
B s B
gg S d
i
( ) 1p pS d
( ) Re[ ( )]eff
B s c sg g
MHz 17~ GHz, 25.11~
glass silicafor m/W 105~ 11
BB
Bg
)exp( tB
2 2
2
0
4( ) e A
p B B
p p A B
fg g
n c
1E
2E
2
*
1 EE
p
B p s p
sB p s s
dIg I I I
dz
dIg I I I
dz
0p s
dI I
dz
( ) (0) z
p pI z I e
0(0) ( ) exp( / )s s B eff effI I L g P L A L
( ) / 21B B cr eff effg P L A
0
0p s
dI I
dz
p sI I C
( ) ( )exp( )
(0) (0)
s sB
s s
I z C I zg Cz
I C I
(0) (0)p sC I I
0 0
0
(1 )( ) (0)
( )s p
b bI z I
G z b
0 0( ) exp[(1 ) ]G z b g z
0 0(0) / (0), (0)s p B pb I I g g I
( ) / (0)in s pb I L I 0(0) / ( ) /s s s inG I I L b b
0exp( )AG g L
°
0.0 0.5 1.0 1.5 2.0 2.50
50
100
150
200
Tem
pera
ture
[oC
]
Distance, z [m]
1059.6 1059.8 1060.0 1060.2 1060.4
-80
-70
-60
-50
-40
Pow
er
[dB
]
Wavelength [nm]
Rayleigh Brillouin
Nonlinear increase of
Brillouin Stokes
1059.6 1059.8 1060.0 1060.2 1060.4
-80
-70
-60
-50
-40
Pow
er
[dB
]
Wavelength [nm]
~25 dB @T = ~50 K
Rayleigh Brillouin
Brillouin Stokes decrease
with T
99/1
coupler
Cladding-pumped
SM YDF
Fiber DFB
@1060 nm
EO modulator Passive SMF
on the metal bobbin
L = 14 m SBS
monitoring
Heating
Cooling
Signal thruput
Backscattered
signal
Output/Input:
~2 W (peak) T
)()()(
)2/)(())((
)2/)((),( 022
2
zTCzCz
where
gzz
zzg
TB
B
BB
BB
B
of
•
• •
•
•
•
B
1060 1080 1100 1120 1140-80
-60
-40
-20
Pow
er,
dB
Wavelength, nm
MHz7.2~)( maxB
14 16 18 20 22 24 26-0.5
0.0
0.5
1.0
1.5
2.0
2.5
3.0
(
B),
MH
z
Fiber poision, m
P = 0 W
P = 3.1 W
P = 6.5 W
MHz62~B
GHz03.11~B
10.90 10.95 11.00 11.05 11.100.0
0.2
0.4
0.6
0.8
1.0 P = 0 W
P = 3.1 W
P = 6.5 W
z = 20 m
Back s
catt
ere
d p
ow
er,
a.u
.
Frequency shift, GHz
14 16 18 20 22 24 26-0.5
0.0
0.5
1.0
1.5
2.0
2.5
3.0
(
B),
MH
z
Fiber poision, m
P = 0 W
P = 3.1 W
P = 6.5 W
-400 -200 0 200 4000.0
0.2
0.4
0.6
0.8
1.0
Bri
llou
in g
ain
, a
.u.
Frequency deviation, MHz