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