Soliton Research at the Lightwave Communication Systems Laboratory

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Soliton Research at the Lightwave Communication
Systems Laboratory
Ken Demarest
Department of Electrical Engineering Computer
Science
University of Kansas
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Summary

• Introduction to optical solitons
• The KU soliton generator
• The KU recirculating loop
• Preliminary soliton transmission results
• Summary and suggestion for future work

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Optical Solitons
An optical soliton is a short, high-amplitude an
optical pulse that does not spread as it
propagates
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Linear, Dispersive Fiber
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Kerr Effect and Chirp
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Nonlinear, Nondispersive fiber
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Nonlinear Fiber with Positive Dispersion
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Fundamental Soliton
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Soliton-based optical fiber transmission
Achieved error free distances in single-channel
and WDM
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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
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Mach-Zehnder Soliton Generator
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Amplitude Modulation
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Pulse Compression
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Structure and Operation
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KU Soliton Generator
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Mearsured Pulse Compression
Compressed pulses
Uncompressed pulses
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Soliton Source Output
Data Encoded Soliton Sequence
Soliton Train
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20GHz Time/polarization Division Multiplexed
Soliton Train
PM fiber
Incident Light
Polarization of
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Soliton Generator For WDM
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Recirculating Loop
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KU Recirculating Loop Testset
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OC48 Rate Transmission Emulation
Standard Fiber
75 km Error Free
600 km Error Free (BERlt210-13)
1050 km BER210-10
1350 km BER310-7
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Measured, Near-Soliton Characteristics
20 ps/div
Transmitter
435 km
635 km
Launch power 8 dBm
-2.5 dBm
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Future Work
1. Long-distance 10 Gb/s or time/polarization-div
ision-multiplexed soliton transmission in
alternating positive and negative dispersion
fiber links.
2. 10 Gb/s or 20 Gb/s WDM transmission in
dispersion- compensated standard fiber link with
long amplifier spans.
3. Experimental demonstration of soliton control
for all-optical networks.