Transcript Linear, Dispersive Fiber

Soliton Research at the Lightwave
Communication Systems Laboratory
Ken Demarest
Department of Electrical Engineering & Computer Science
University of Kansas
Summary
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Introduction to optical solitons
The KU soliton generator
The KU recirculating loop
Preliminary soliton transmission results
Summary and suggestion for future work
Optical Solitons
.
Output
Output
An optical soliton is a short, high-amplitude an optical pulse
that does not spread as it propagates
t
t
Ordinary Pules
r
r
e
fib
Input
Input
e
fib
t
Soliton Pules
t
Linear, Dispersive Fiber
Time
Le
n
gt
h
Intensity
Le
n
gt
h
Intensity
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Freq
uenc
y
Kerr Effect and Chirp
Amplitude Profile
Kerr Phase
Instantaneous Frequency
t
Front
Back
t
t
Nonlinear, Nondispersive fiber
Time
Le
ng
th
Intensity
Le
ng
th
Intensity
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Freq
u
ency
Nonlinear Fiber with Positive
Dispersion
Time
Le
ng
th
Intensity
Le
ng
th
Intensity
.
Freq
uenc
y
Fundamental Soliton
Time
Le
ng
th
Intensity
Le
ng
th
Intensity
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Freq
ue
ncy
Soliton-based optical fiber
transmission
Ti t l e :
s o l i to n 1 .p s
Cre a to r :
XV Ve rs i o n 3 .0 0 Re v : 3 /3 0 /9 3 - b y J o h n Br a d l e y
Pre v i e w:
Th i s EP S p i c tu re wa s n o t s a v e d
wi t h a p re v i e w i n c l u d e d i n i t.
Co m m e n t:
Th i s EP S p i c tu re wi l l p ri n t to a
Po s tSc ri p t p ri n te r, b u t n o t to
o th e r ty p e s o f p r i n te r s .
T it l e :
s ol i ton 2.p s
C re a to r:
X V V e rs io n 3 . 0 0 Re v : 3 /3 0 /9 3 - b y J o h n Bra d l e y
P re v ie w :
T h i s E P S p ic t u re wa s n o t s a v e d
w it h a p re v ie w i n c l u d e d i n it .
Com m e nt:
T h i s E P S p ic t u re wi l l p ri n t t o a
P o s t Sc rip t p ri n t e r, b u t n o t t o
o th e r t y p e s o f p ri n t e rs .
Achieved error free distances in single-channel and WDM
Three Types of Soliton Generators
1. Soliton laser based on mode-locking
2. Electroabsorption Modulator-based soliton generators
3. LiNbO3 Mach-Zehnder Modulator-based soliton
generators
Mach-Zehnder Soliton Generator
Amplitude Modulation
Pulse Compression
Structure and Operation
T itle:
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KU Soliton Generator
Mearsured Pulse Compression
Uncompressed
pulses
Compressed pulses
Soliton Source: Output
Soliton Train
Data Encoded Soliton Sequence
20GHz Time/polarization Division
Multiplexed Soliton Train
PM fiber
Polarization of Incident Light
Soliton Generator For WDM
Recirculating Loop
KU Recirculating Loop Testset
OC48 Rate Transmission
Emulation
Standard Fiber
75 km: Error Free
600 km: Error Free
(BER<2*10-13)
1050 km: BER=2*10-10
1350 km: BER=3*10-7
Measured, Near-Soliton
Characteristics
Transmitter
20 ps/div
4*35 km
6*35 km
Launch power: 8 dBm
-2.5 dBm
Future Work
1. Long-distance 10 Gb/s or time/polarization-division-multiplexed
soliton transmission in alternating positive and negative dispersion
fiber links.
2. 10 Gb/s or 20 Gb/s WDM transmission in dispersioncompensated standard fiber link with long amplifier spans.
3. Experimental demonstration of soliton control for all-optical
networks.