490 Mhz spaced optical frequency comb based on an yb fiber-ring laser
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Transcript of 490 Mhz spaced optical frequency comb based on an yb fiber-ring laser
490 MHz spaced optical frequency comb based on an Yb-fiber-ring laser
Peng Li, Aimin Wang and Zhigang ZhangSchool of Electronics Engineering and Computer
Science, Peking [email protected]
CLEO 2012 CTh1J.3
Outline
Introduction
Motivation
Challenge and Solutions
Experimental Schematic
Results and Discussions
Conclusions
Trend low phase noise
high repetition rate
high power
wide spectral coverage
great robustness
N.R.Newbury et al, Nature Photon. 5, 186–188(2011)
Introduction
• Solid state based
High repetition rate capability
Low noise
Lack long term stability
High cost
• Fiber based
Long term stability
High noise
Lack high repetition rate capability
Low cost
Methods
Motivation
Yb-fiber-ring laser
High efficiency
High power
High repetition rate capability
Short pulses generation mechanism
Goal
High repetition rate Yb-fiber-ring laser based optical frequency comb
Challenge and SolutionsChallenge
High repetition rate Yb-fiber-ring laser
Low power pumped octave-span-spectrum generatio
Solutions
Semi-WDM
Highly doped gain fiber
Tapered PCF
Experimental Schematic
PART 1
PART 2
PART 3
Experimental Schematic
Repetition rate: 490 MHz
Output power: 250 mW (800 mW pump)
Output spectrum bandwidth: 38nm
1.7 W, 77 fs
1 W
600 nm – 1300 nm
1 10 1001E-13
1E-12
1E-11
Alla
n D
evia
tio
n
Tau (s)
Allan Deviation
0 200 400 600 800 1000
-60
-40
-20
0
Inte
nsi
ty (
dB
)Frequence (MHz)
RF SpectrumSampled Frequency
0 1000 2000 3000 4000488149269.988
488149270.007
Fre
qu
ency
(H
z)Time (s)
950 1000 1050 1100 1150-90
-80
-70
-60
-50
Po
wer
(d
B)
Wavelength (nm)
Optical Spectrum
1000 1025 1050 1075 1100-80
-70
-60
-50
-40
Inte
nsi
ty (
dB
)
Wavelength (nm)
Optical Spectrum
-900 -600 -300 0 300 600 9000.0
0.2
0.4
0.6
0.8
1.0
Inte
nsi
ty (
a.u
.)
Time Delay (fs)
Autocorrelation
500 750 1000 1250 1500-70
-60
-50
-40
-30
Po
we
r (d
B)
Wavelength (nm)
632 nm 1264 nm
Results and Discussion
500 750 1000 1250 1500-70
-60
-50
-40
-30
Po
we
r (d
B)
Wavelength (nm)
632 nm 1264 nm
22 0 0
2
D
NL
PTLN
L
Soliton order in octave-span-spectrum generation
Un-tapperedTappere
d
T0 (fs) 77 77
P0 (kW) 26 26
β2 (fs2) 2.5 -102
γ (W-1km-1) 11 57
N 26 9
Results and DiscussionPump noise influence on fceo line width
0 1 2 3 4-0.6
-0.4
-0.2
0.0
0.2
0.4
0.6
Vo
ltag
e (V
)
Time (s)0 1 2 3 4
-0.6
-0.4
-0.2
0.0
0.2
0.4
0.6
Vo
ltag
e (V
)
Time (s)
0 100 200 300 400-50-45-40-35-30-25-20-15-10
Po
wer
(d
B)
Frequence (MHz)
RBW 300 kHz
0 100 200 300 400-50-45-40-35-30-25-20-15-10
Po
wer
(d
B)
Frequence (MHz)
RBW 300 kHz
Noisy Pump Silent Pump
PumpIntensity
fceo
Results and DiscussionDispersion influence on fceo line width
0 100 200 300 400-50
-40
-30
-20
-10
Po
wer
(d
B)
Frequency (MHz)0 100 200 300 400
-60
-50
-40
-30
-20
-10
Po
wer
(d
B)
Frequency (MHz)
950 1000 1050 1100 1150
-80
-70
-60
-50
-40
-30
Po
wer
(d
B)
Wavelength (nm)950 1000 1050 1100 1150
-90
-80
-70
-60
-50
Po
wer
(d
B)
Wavelength (nm)
RBW 300 kHz RBW 300 kHz
Spectrum
fceo
Soliton DM Soliton
Conclusions• 490 MHz NPE mode locked Yb-fiber-ring laser
• 1.7 W, 77 fs pulses pumping 600 nm – 1300 nm spectrum
• 33 dB S/N fceo at 100 kHz RBW
• fceo stabilization will be done
400 450 500 550 600-70
-60
-50
-40
-30
-20
-10
Inte
nsi
ty (
dB
)
Frequency (Mhz)
33dB
RBW 100 kHz
Thank you