Soliton Research at the Lightwave Soliton Research at the Lightwave Communication Systems Laboratory Communication Systems Laboratory Ken Demarest Department of Electrical Engineering & Computer Science University of Kansas
Dec 21, 2015
Soliton Research at the Lightwave Soliton Research at the Lightwave Communication Systems Communication Systems
LaboratoryLaboratory
Ken Demarest
Department of Electrical Engineering & Computer ScienceUniversity of Kansas
SummarySummary
• Introduction to optical solitons
• The KU soliton generator
• The KU recirculating loop
• Preliminary soliton transmission results
• Summary and suggestion for future work
Optical SolitonsOptical Solitons
An optical soliton is a short, high-amplitude an optical pulse that does not spread as it propagates
.
t
t
tOrdinary PulesSoliton Pules
t
fiber
fiber
Inpu
t
Inpu
t
Out
put
Out
put
Linear, Dispersive FiberLinear, Dispersive Fiber
.
Inte
nsit
y
Inte
nsit
yTime
Frequency
Lengt
h
Lengt
h
Kerr Effect and ChirpKerr Effect and Chirp
Amplitude Profile Kerr Phase Instantaneous Frequency
Front Back
t
t
t
Nonlinear Fiber with Positive Nonlinear Fiber with Positive DispersionDispersion
.
Frequency
Inte
nsit
y
Inte
nsit
yTime
Soliton-based optical fiber Soliton-based optical fiber transmissiontransmission
Achieved error free distances in single-channel and WDM
Title:soliton1.psCreator:XV Version 3.00 Rev: 3/30/93 - by John BradleyPreview:This EPS picture was not savedwith a preview included in it.Comment:This EPS picture will print to aPostScript printer, but not toother types of printers.
Title:soliton2.psCreator:XV Version 3.00 Rev: 3/30/93 - by John BradleyPreview:This EPS picture was not savedwith a preview included in it.Comment:This EPS picture will print to aPostScript printer, but not toother types of printers.
Three Types of Soliton Three Types of Soliton GeneratorsGenerators
1. Soliton laser based on mode-locking
2. Electroabsorption Modulator-based soliton generators
3. LiNbO3 Mach-Zehnder Modulator-based soliton generators
Structure and OperationStructure and OperationTitle:/tmp/xfig-fig015248Creator:fig2devPreview:This EPS picture was not savedwith a preview included in it.Comment:This EPS picture will print to aPostScript printer, but not toother types of printers.
20GHz Time/polarization 20GHz Time/polarization Division Multiplexed Soliton Division Multiplexed Soliton
TrainTrain
PM fiber
Incident LightPolarization of
OC48 Rate Transmission OC48 Rate Transmission EmulationEmulation
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
20 ps/divTransmitter
4*35 km
6*35 km
Launch power: 8 dBm -2.5 dBm
Measured, Near-Soliton Measured, Near-Soliton CharacteristicsCharacteristics
Future WorkFuture Work
1. Long-distance 10 Gb/s or time/polarization-division-multiplexedsoliton 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.