A comment on Table 88-7 and 88-8 in Draft 1.0

A comment on Table 88-7 and 88-8 in Draft 1.0IEEE802.3 ba Task Force 9-13 November 2008Hirotaka Oomori Sumitomo ElectricChris Cole FinisarKazuyuki Mori FujitsuMasato Shishikura Opnext1¾¾IntroductionOne of the solutions to reduce the cost of 100GBASE-LR4 is leveraging DML. But some of the parameters in the optical spec (Table. 88-7, 88-8) would be better to be tweaked for DML use.This material shows what the issues are and proposes the remedy of this issue.9-13 November 2008 IEEE802.3 ba Task Force 2Optical specs in 100GBASE-LR4Launch OMA max : 4.0dBmLaunch OMA min : -0.8dBmReceive OMA min : -8.1dBm9-13 November 2008 IEEE802.3 ba Task Force 399Level diagram per lane as per 100GBASE-LR4 baseline Transmitter OMA (max)4.0dBm Receive OMA (max)Launch OMA rangeAllocation for penalties-0.8dBm2.2dBTransmitter OMA per lane (min)-1.8dBmLaunch power in OMA-TDP (min)Channel Insertion Loss6.3dB-8.1dBmSensitivity OMA (max)The Transmitter launch OMA range is from -0.8dBm to 4.0dBmThe range of 4.8dB is 1.66dB less than that in the 40GBASE-LR4.(See appendix)9-13 November 2008 IEEE802.3 ba Task Force 4Very narrow margin in Transmitter launch OMA for 100GBASE – LR44.0dBm Transmitter OMA max2.5dBm1.9dBm1.75dBm1.6dBm1.45dBm1.3dBm0.7dBmTransmitter OMA min-0.8dBmVery narrow margin : 0.3dBAssumptionsPower change over life (+/- 0.5dB)Power change over the operation temp. in TOSA (+/- 1.0dB)Maximum deviation of MUX insertion loss per ...