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Transmitted SpectraROADM50GHz ProfileNRZ10GbpsPSBTA narrow spectrum (i.e longer pulses) improves tolerance to CD, PMD, <strong>and</strong> ROADM tolerance.CONFIDENTIAL © 2007 STRATALIGHT COMMUNICATIONS ALL RIGHTS RESERVED. 20
Quadrature Phase Shift Keying (QPSK)IΦ3/2ππ1/2π021.5G21.5G1/2πPre-CodePre-Code1 1 0 1 0 0 1 0• Four Level Phase <strong>Modulation</strong>• Complex Transmitter Design• Two phase modulators nested within phase shift• Decrease line rate by ½• Increased PMD tolerance• Increased chromatic dispersion tolerance• Increased spectral efficiency• Decreased receiver sensitive with respect toDSPK but increase w.r.t. NRZDuo Binary1/2πImπ-1√210RePSBT3/2πCONFIDENTIAL © 2007 STRATALIGHT COMMUNICATIONS ALL RIGHTS RESERVED. 21
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 18 and 19: Differential Phase Shift Keying (DP
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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