Presentation on theme: "No Dispersion Compensation 2000km NDSF Transmission of a 10Gb/s Signal using Microwave Single-Sideband Multiplexing."— Presentation transcript:
No Dispersion Compensation 2000km NDSF Transmission of a 10Gb/s Signal using Microwave Single-Sideband Multiplexing
2 Motivation No chromatic dispersion compensation Avoids additional loss, cost and penalties No dispersion map issues Residual dispersion Dispersion-nonlinearity interaction No PMD compensation 400psec pulse is four times more tolerant to PMD than 100psec pulse. Frequency stability Tight spacing needs frequency stability Microwave LO’s are 10 times more stable Microwave muxing is cheaper than 4 independent optical Tx
3 Outline Baseband optical duobinary Experimental setup BER performance for distance OSNR requirement Effects of launch power- Nonlinearity Conclusion
Baseband Optical Duobinary 012345 010111 101000 0110000 -VVV 0V0 0E0-E 010111 Data EXOR Data Encoder Out LPF In LPF Out Modulator Out At receiver Differential Encoder Low pass filter Modulator biased at null
20 2000 km Performance <1dB OSNR deviation @ 10 -4 BER
21 OSNR Requirement for 10 -3 BER OSNR requirement is <7dB @1200km Getting high OSNR at short distances is easy.
22 OSNR Requirement for 10 -4 BER OSNR requirement is <11dB @2000km and <9dB for 1200km
23 Effect of launch power on 18 GHz Channel Penalty increase is <1dB from -4.5dBm to -3.5dBm Optimum launch power is ~-3.5dBm
24 Effect of launch power on 6 GHz Channel Penalty increase is <1dB from -4.5dBm to -3.5dBm
25 Spectrum for LP Variation -4.5 dBm LP-2.5 dBm LP 19.3dB 17.2dB After 2000km but spectrum is filtered after 1000km with a 40GHz Demux. Uneven channel spacing helps nonlinearity performance
26 RF Spectrum before Optical Modulator All 4 channels 18 GHz Ch 15 GHz Ch 10dB/div 2dB/div
27 Effect of LPFing on Spectrum LPF is a 1Ghz ~4 th order Bessel filter
28 Conclusion 10Gb/sec 2000km no dispersion compensation transmission demonstrated Flat group delay large bandwidth devices are designed Our microwave techniques enable high spectral efficiency, low cost, high performance optical systems
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