Soliton Research at the Lightwave Communication Systems Laboratory

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Presentation transcript:

Soliton Research at the Lightwave Communication Systems Laboratory Ken Demarest Department of Electrical Engineering & Computer Science University of Kansas 1 1

Summary Introduction to optical solitons The KU soliton generator The KU recirculating loop Preliminary soliton transmission results Summary and suggestion for future work 2 2

Optical Solitons An optical soliton is a short, high-amplitude an optical pulse that does not spread as it propagates

Linear, Dispersive Fiber 25

Kerr Effect and Chirp 26

Nonlinear, Nondispersive fiber 28

Nonlinear Fiber with Positive Dispersion 27

Fundamental Soliton 29

Soliton-based optical fiber transmission Achieved error free distances in single-channel and WDM 3 3

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 8 5

Mach-Zehnder Soliton Generator 9 6

Amplitude Modulation 10 7

Pulse Compression 16 8

Structure and Operation 18 10

KU Soliton Generator 19 11

Mearsured Pulse Compression Uncompressed pulses Compressed pulses 21 13

Soliton Source: Output Soliton Train Data Encoded Soliton Sequence 20 12

20GHz Time/polarization Division Multiplexed Soliton Train PM fiber Polarization of Incident Light 23 14

Soliton Generator For WDM 24 15

Recirculating Loop 27 16

KU Recirculating Loop Testset 32 20

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 31 19

Measured, Near-Soliton Characteristics 20 ps/div Transmitter 4*35 km 6*35 km Launch power: 8 dBm -2.5 dBm 37 22

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 dispersion- compensated standard fiber link with long amplifier spans. 3. Experimental demonstration of soliton control for all-optical networks. 39 23

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