490 mhz spaced optical frequency comb based on an yb fiber-ring laser
TRANSCRIPT
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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
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Outline
Introduction
Motivation
Challenge and Solutions
Experimental Schematic
Results and Discussions
Conclusions
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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
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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
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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
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Experimental Schematic
PART 1
PART 2
PART 3
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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
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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
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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
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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
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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
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Thank you