640KB - 高知工科大学

1100218
1
......................................................................................................................- 1 .1
.................................................................................................................- 1 -
1.2
...................................................................................................................- 1 -
1.3
...................................................................................................................- 1 OFDR
OFDR
2.1 OFDR
........................................................................................- 2 ........................................................................................................- 2 -
2.2
..........................................................................................................................- 2 -
2.3
...................................................................................................................- 2 -
3
...........................................................................................................- 5 -
3.1
...............................................................................................................- 5 -
3.2
...................................................................................................................- 7 ...............................................................................................................- 10 -
4.1
.....................................................................................................................- 10 -
4.2
.................................................................................................................- 10 -
5
...............................................................................................................- 14 .................................................................................................................- 19 -
6-1
.........................................................................................................................- 19 -
6-2
.........................................................................................................................- 19 ...............................................................................................................................- 20 ........................................................................................................................- 21 -
1
.1
(OFDR:Optical
Frequency Domain
Reflectometry )
1.2
10cm
OFDR
10cm
OFDR
OFDR
45μm
[1]
1.3
2
4
OFDR
3
OFDR
5
-1-
OFDR
2.1 OFDR
OFDR
OFDR
OFDR
2.2
OFDR
OFDR
Δlc
(2.1)
lc = c / 2n∆fπ
(2.1)
c
lc
n
Δf
OFDR
2.3
OFDR
-2-
3-1
2-2
υ [m/s]
[m]
T[s]
2-1
T
[Hz]
(2.3)
L
T = 2L /υ
fb =T γ
= γ
2L /υ
(2.2)
L = f bυ / 2 ⋅ γ
(2-3)
γ[Hz/s]
-3-
.
2-2
-4-
3
3.1
(FM)
3-1
3-2
νc = Vc sin ωc t =Vc sin 2π ⋅ f c t
νp = V p cos pt = Vc cos 2π ⋅ f p t
ω c = 2π ⋅ f c ( f c
)
p = 2π ⋅ f p ( f p
)
θm :
Vm
Vm = Vc sin θ m
3-1
-5-
(3.1)
(3.2)
3-2
3-2
[2]
-6-
3.2
DFB-LD
3-3
f s [Hz]
3-3
fs
fs
fs
fb 〉 f s
fb
fs
10
f b 〉 10 f s
f b f s 〉10
3-4
DFB-LD
DFB-LD
-7-
∆f
fb
3-4 DFB
3-5
∆f = C ( f 2 − f1 ) = C (1 λ2 − 1 λ2 )
-8-
= C(λ1 λ1 ⋅ λ2 ) − C(λ2 λ1 ⋅ λ2 )
= C(λ1 − λ2 ) λ1 ⋅ λ2
5.63[GHz]
5mA
∆f I = 5.63GHz 5mA
∆f I =1.12 GHz mA
(3.3)
1mA
1.12GHz
DFB-LD
∆f
154mA
0.17THz
γ = ∆f T
= ∆f ⋅ f s
L
L = fb ⋅ν 2γ
=ν ⋅ fb 2∆ f ⋅ fs
= ( fb fs ) ⋅ν 2∆ f
≒0.867cm
0.9cm
0.9cm
-9-
4.1
4
(DFB)
4-1 OFDR
4.2
① 4-1
2kHZ
0.5m
0.5m
4.5m
4.5m
6
5
2
(2.1)
- 10 -
②
4-1
200MHZ
4-4,
4-5
200MHZ
4-2
4-6
A
B
B
4-2
- 11 -
4-3
4-4
4-5
- 12 -
4-6
- 13 -
5
①
①
5-1
0.5m
8.54[THZ]
5-1
42.7[kHz]
(2.2)
L = f bυ / γ
L
≒
(2.2)
[m]
0.5m
5-2
0.5m 4.5m
5-1
0.5m
0.5m
- 14 -
5-2
0.5m 4.5m
②
5-3
②
5-4
5cm
5cm 10cm
2.2[kHz],10cm
①
5-5
6[THZ/s]
4[kHz]
(4.3)
0.5cm
65cm
- 15 -
5-3
5cm
5-4
10cm
- 16 -
5-5
0.5cm 65cm
A
5.3cm
1.4[kHz]
6.3cm
① ②
1.8[kHz]
(2.2)
5-6
5.3cm
- 17 -
B
5-7
6.3cm
5-8
- 18 -
6-1
6.3cm 9.3cm
1cm
3
1cm
6-2
1cm
3
DFB-LD
0.9cm
L = f b ⋅ν 2 γ
DFB-LD
1cm
154mA
15.7ms
1cm
- 19 -
0.9cm
2010/2/19
- 20 -
(1) 1.2
②
A
(2)
(3)
- 21 -