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10/10 and 10/1 budgets

10/10 and 10/1 budgets. Edited by Frank Effenberger Huawei Technologies May 2007. Supporters. Name Affiliation. 10 Gb/s components. NOTE: All values here use the ITU formalism, which assumes an ER~9 dB 10 Gb/s receivers (CW mode) PIN-based: sensitivity around -16 ~ -18 dBm

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10/10 and 10/1 budgets

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  1. 10/10 and 10/1 budgets Edited by Frank Effenberger Huawei Technologies May 2007

  2. Supporters • Name Affiliation

  3. 10 Gb/s components • NOTE: All values here use the ITU formalism, which assumes an ER~9 dB • 10 Gb/s receivers (CW mode) • PIN-based: sensitivity around -16 ~ -18 dBm • APD-based: sensitivity around -24 dBm • FEC • A pretty safe swag at FEC optical gain: 4 dB • So, with FEC, the receivers can give us • PIN-based: sensitivity around -20 ~ -22 dBm • APD-based: sensitivity around -28 dBm

  4. Budget, Loss, and Penalties • Here, we use the following definition: • Budget = Loss + Penalty = Tx(min) – Sensitiv. • Estimates of 10G penalty: • Upstream: 1 dB, assuming DM laser at 1310nm • Downstream: 1 dB, assuming EM laser at 1570nm • Straw polls indicated an interest in defining three budgets: • “PX10” : 20 dB loss • “PX20” : 24 dB loss • “B++” : 29 dB loss • Let’s assume a dynamic loss range of 15 dB

  5. Our blessed single data point • The 1GE-PON OLT sensitivity is -29.7 dBm (at an ER of 10 dB) • Let’s call it -30 dBm, between friends? • The following slide shows a best-effort at trying to reconstruct the whole budget(!) • From the dual-rate burst mode analysis • Simple ‘parallel’ receiver will have a sensitivity delta of ~7 dB between 1.25G and 10G • So, 10G sensitivity of -23 dBm is what we need • With FEC, that gives us -27 dBm

  6. 1 2 3 3 0 0 Upstream 1G Budgets (no FEC) 4 5

  7. 5 4 0 0 4 0 4 0 1 Upstream 10G Budgets 5 4 0 5 1 0

  8. 5 4 0 0 4 0 5 Downstream 10G Budgets 5 0 5 0

  9. Important simplifications • The design approach was to reduce the number of distinct optic types • PX10 and PX20 PMD are identical • We use FEC to take the PX10 budget the extra 4 dB to reach the PX20 budget • B++ budget defines only 1 new optic • We improve only one side to get the 4~5 dB to reach the B++ budget • Other approaches are possible, but • It is unclear if they reduce device and system cost significantly • They will certainly result in more optic types, and this could reduce volumes and cause uncertainty in the market

  10. The big B++ questions • Upstream • Option a: APD at OLT (receiver constant) • Keeps OLT constant across all classes • Requires a High power ONT for B++ • Option b: Pre-amplified OLT (transmitter constant) • Keeps ONT constant across all classes • Requires a Super sensitive OLT for B++ • Downstream • Option 1: PIN at ONT (receiver constant) • Keeps ONT constant across all classes • Requires a High power OLT for B++ • Option 2: APD at ONT (transmitter constant) • Keeps OLT constant across all classes • Requires a Super sensitive ONT for B++

  11. Possible Choices Downstream PIN at ONT (Option 1) APD at ONT (Option 2) 1a: Both Rx constant Symmetric system: 2 ONT, 2 OLT Asymmetric system: 1 ONT, 3 OLT 2a: OLT Constant (kinda) Symmetric system: 2 ONT, 1 OLT Asymmetric system: 2 ONT, 3 OLT APD at OLT (Option a) Upstream 1b: ONT constant Symmetric system: 1 ONT, 2 OLT Asymmetric system: 1 ONT, 3 OLT 2b: Both Tx constant Symmetric system: 2 ONT, 2 OLT Asymmetric system: 2 ONT, 3 OLT SOA at OLT (Option b)

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