Optical Communications Technology and Modulation Formats 16 ...

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From 10 Gbps to 40Gbps• Optics• OSNR lowered by 6 dB (1/4)• CD tolerance goes down by <strong>16</strong>• PMD tolerance goes down by 4• ROADM tolerance• Nonlinear effects• Electronics• b<strong>and</strong>width increases by 4• power dissipation• footprint • Economics• 40G system price expected to be x2.5-x3 the price of a 10G system CONFIDENTIAL © 2007 STRATALIGHT COMMUNICATIONS ALL RIGHTS RESERVED. 10
Increasing Capacity per Channel10Gbps NRZ + 40Gbps NRZ at 100 GHz Spacing• At 10Gbps 50GHz is o.k. with minor crosstalkpenalty• At 40Gbps even 100GHz grid support is achallenge• 50GHz grid not possible with 40Gbps NRZ• Added spectrum degradation due to ROADMs• Need more spectrally efficient modulation formatI193.100 THz1552.52nm193.200 THz 193.300 THz 193.400 THz 193.500 THz1549.32nm10Gbps NRZ + 40Gbps NRZ at 50 GHz SpacingI193.100 THz1552.52nm193.200 THz 193.300 THz 193.400 THz 193.500 THz1549.32nmCONFIDENTIAL © 2007 STRATALIGHT COMMUNICATIONS ALL RIGHTS RESERVED. 11
Page 8 and 9: Optical Impairments• Polarization
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 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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