????

1
????????????????????????????????????????
????????? CREST??????????A ?????????????A
????

• ????
• ??
• ?????????????
• ????????
• ????????????????????
• ???????
• ????????

2
??
???
WDM (Wavelength Division Multiplexing)
1??????????????????????????????????
????????
0.8nm(100GHz)???????????
????
???????????????????1????????1???????
3
??
??????????????????????
100 GHz????????????????
( 0.4 meV)
????????????
100 GHz
100 GHz
100 GHz
Intensity (a.u.)

0
100
200
300
detuning (GHz)
detuning (GHz)
detuning (GHz)
detuning (GHz)
4
Sampled Grating DBR laser????????
Sampled Grating 1
Sampled Grating 2
Gain
Phase
R1
R2
Beat
?????????????????????? ????????????????????????
?????
???????????????????????? ?????????????????????????
??
5
?????????????
???????
???
?????
??????? ??????(AR coating)???? ??????????????
???????????????? ??????????????????
??????????????????????????? ????
?????????????? ???????????????????
6
????????
?? ????? ???? ??(???????) ?????? ????????
lens
mirror
laser diode
LD
AR coating
?????????
?? ??????????? ??? ???????????? ??????
optical isolator
LD
7
????????
???
??? R
?? A
L
?? c
??? n
???????(Free Spectral Range)
??(finesse)
??? n
????????????
1
FSR
FWHM
???
0.5
0
??? n
8
????????????
1
???
????FSR???? 2???????
0
???
2??????????????
1
???
??? ????? ???
0
???
????????????
1
???
0
???
2??????????????
1
???
0
???
9
????????????????
FSR95 GHz, finesse5.1
FSR100 GHz, finesse36
1
0.1
???
???
0
0
196
196.2
196.4
196.6
195.8
196
196.2
196.4
196.6
195.8
???(THz)
???(THz)
2?????
0.1
???
???6.4 GHz
0
196
196.2
196.4
196.6
195.8
???(THz)
10
??
etalon
angle 66.5 deg 0 deg
FSR 95.0GHz 100GHz
Finesse 5.1 36
polarizing beam splitter (PBS)
l/2 plate
optical isolator
lens
LD
mirror
laser diode
spectrum analyzer
linewidth 50 kHz
11
??
????????????????????
16 ch
100GHz
q (deg)
intensity (a.u.)
6.1
6.2
6.3
6.4
6.5
196
196.5
195
195.5
197
197.5
frequency (THz)
12
??
??????????????????????
1
100GHz
???
0.5
Dq
0
???
1
100GHz
???
0.5
0
???
13
?????????????????????
197.5
197
196.5
????? (THz)
196
195.5
195
5.9
6.0
6.1
6.3
6.2
6.4
6.5
??????? (deg)
14
???
2??FSR???????????????????????????????????????????
1ch(100 GHz)???????????????
2?????????????????????????????????????????????????
??????????
15
?????
??????????????????????????????????????????????????
?FSR?????? ????????????????????
??????????????????? (3040ch??????)
????????????????