Optical Communications Technology and Modulation Formats 16 ...

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Differential Phase Shift Keying (DPSK)LASER43GIΦ3/2ππ1/2π0DPSKPre-Code1 1 0 1 01/2πImLPF• Phase Modulation only• Can be implemented via amplitude modulation only• Simpler than Duo-Binary• Slightly more Complex Transmitter Design• Required data pre-coder• Simpler than Duo-Binary• Optical Spectrum is medium• Can propagate on a 50GHz gridπ-110Re• Higher tolerance to non-linear effects• Higher receiver sensitivity by 3dB• More complex receiverDBPSK3/2πCONFIDENTIAL © 2007 STRATALIGHT COMMUNICATIONS ALL RIGHTS RESERVED. 18
Return to Zero Differential Phase Shift Keying (RZ-DPSK)21.5G Clk• Mainly phase modulation format• Slightly more Complex Transmitter Design• Required additional clock modulation43GIPre-Code21.5G Clk• Pulse train has RZ pulse shape in every slotwith data encode in differentially phase onlyΦ3/2ππ1/2π01 1 0 1 0• Optical Spectrum is wide• Higher tolerance to non-linear effects• Higher receiver sensitivity by 3dBRZ-DPSK1/2πIm-110πReRZ- DBPSK3/2πCONFIDENTIAL © 2007 STRATALIGHT COMMUNICATIONS ALL RIGHTS RESERVED. 19
Page 8 and 9: Optical Impairments• Polarization
Page 10 and 11: From 10 Gbps to 40Gbps• Optics•
Page 12 and 13: Modulation SchemesStrataLight propr
Page 14 and 15: Modulation SchemesModulation Attrib
Page 16 and 17: Carrier Suppressed Return to Zero (
Page 20 and 21: Transmitted SpectraROADM50GHz Profi
Page 22 and 23: Differential Quaternary Phase Shift
Page 24 and 25: Transmitted SpectraROADM50GHz Profi
Page 26 and 27: Transmitter Block DiagramsPSBTI inN
Page 28 and 29: DWDM Filter CompatibilityStrataLigh
Page 34 and 35: Performance at 40GbpsStrataLight pr
Page 36 and 37: DPSK WDM Penalty• 50G grid: at th
Page 38 and 39: Conclusions and Summary• Metro Ap
Page 40 and 41: Technical LeadershipStrataLight pro
Page 42 and 43: High level market requirements• M
Page 44 and 45: Development solution - PM-QPSKTx Bl

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