Versatile ______________ Report Link System Status Annie Xiang

Versatile ______________ Report Link System Status Annie Xiang on behalf of WP 1. 1 Group SMU Physics March, 2010

Versatile Link Project ______________Description • Optical serial data link front – back end • • • Target data rate ~5 Gbps, link reach ~150 meter Conventional and versatile components in SFP+ package Multi-mode (850 nm) and Single-mode (1310 nm) variants • Point-to-Point architecture studied first • Interface with GBT and FPGA chips A. Xiang, SMU PHYSICS 2

System Study ______________ o. Rx o. Tx • Previously • • • P 2 P Designed and fabricated house version SFP+ carrier boards, running up to 10 Gbps Developed test benches utilizing stand alone Bit Error Rate Tester and Stratix II GX based FPGA Bit Error Rate Tester Characterized physical layer performance in term of transceiver waveforms, system BER scan and fiber link reach o. Tx o. Rx In detector • Current • • • Generate detailed system level specification Collect relevant clauses from industry standards Customize parameters pertain to different interfaces and variants • • Define system power margins Explore link model to extract margins at target data rate and link length Test commercial candidates to refine engineering estimation • A. Xiang, SMU PHYSICS 3

System Level Specification ______________ • Under discussion within versatile link project, emerging • Specify data flow directions and interfaces, distinguish versatile transceiver components and standard transceiver components, include SM and MM flavor A. Xiang, SMU PHYSICS 4

System Level Specification ______________ • Cross reference to industrial standards IEEE 802. 3 ae, MSA SFF-8431, Fiber Channel FC-PI-n and FC-MSQS • Timing and jitter parameters are extracted through data rate scaling with judgmental relax/ constrain • Optical power parameters are modified per link budget page 6 - 9 • Electrical parameters are to be emerged with GBT development • The following table specifies single mode standard and versatile transceiver optical transmit interface Parameters Average launch power (max) (d. Bm) Average launch power (min) (d. Bm) OMA min (m. W/d. Bm) Extinction ratio (min) (d. B) RIN 12 OMA (max) (d. B/Hz) Transmitter eye mask definition Transmitter & dispersion penalty (max) (d. B) Rise/Fall Time (20%-80%) (ps) Total Jitter UIp-p Deterministic Jitter UIp-p 10 GBASE-LR 0. 5 -8. 2 -5. 2 3. 5 -128 See plot 400 -SM-LC-M -1 -11. 2. 15/-8. 2 -120 See plot 800 -SM-LC-I 0. 5 -10. 6. 29/-5. 4 3. 5 -128 See plot VTRx/TRx-SM -1 -8. 2 -5. 2 3. 5 -128 4 GFC scale 3. 2 - 3. 2 (1) - 90 0. 44 0. 26 - 76 0. 44 0. 26 A. Xiang, SMU PHYSICS 5

Link Budget ______________ • Optical power budget is expensed among attenuation, insertion loss, power penalties and margin • Power penalties are allocated for link impairments such as noise and dispersion • Contributors to power penalties include inter-symbol interference, mode partition noise (MM), relative intensity noise, reflection noise (SM), etc. • Irradiation degradations are specific only in our applications. A. Xiang, SMU PHYSICS 6

Link Budget ______________ • Three scenarios fit budget, but MM-downlink requires more power, or • Use in outer range (>40 cm radius) to reduce rad-penalties, or, • Pick components to comply with a tighter specification, i. e. , Tx OMA Parameters MM-uplink MM-downlink SM-uplink SM-downlink Transmit OMA min -3. 8 d. Bm -3. 2 d. Bm Receiver sensitivity OMA max -11. 1 d. Bm -12. 6 d. Bm Power budget 7. 3 d. B 9. 4 d. B Fiber attenuation 0. 6 d. B 0. 1 d. B Connection and splice loss 1. 5 d. B 2 d. B Allocation for penalties 5. 2 d. B 7. 3 d. B TDP and other penalties 1 d. B 1. 5 d. B Tx radiation penalties - - Rx radiation penalties - 7 d. B - 5 d. B 1. 0 d. B - - Ok not yet Ok Ok 3. 2 d. B -3. 8 d. B 5. 8 d. B 0. 8 d. B Fiber radiation penalties (cold) Meet budget Safety margin A. Xiang, SMU PHYSICS 7

Link Budget ______________ • In FC and Gb. E standards, two specifications are developed to assure BER performance, guarding against worst case physical media impairments • Transmitter and Dispersion Penalty test emulates worst case transmitter and fiber plant • Stress test emulates worst case optical input to receiver • Both require advanced equipment that we do not have A. Xiang, SMU PHYSICS 8

Link Budget ______________ • A series of BER sensitivity tests are conducted to evaluate system penalty variation on • • Several commercial transceiver modules Several fiber length, patch cord combinations • System penalty variations are under 1. 5 d. B A. Xiang, SMU PHYSICS 9

Link Model ______________ • • An excel spreadsheet with textbooks engineering equations To be populated with parameter values to represent different link scenarios Model was validated by experiments in multiple labs Generally used for worst case analysis J. Ye, A. Xiang, SMU PHYSICS 10

Link Model ______________ Loss and penalties calculated and plotted against link length Each physical impairment effect can be turned on/off independently Sensitivity against several specifications studied Penalties limit for MM link (850 nm, 5 Gbps, 150 meter) is set to 1 d. B. Penalties limit for SM link (1310 nm, 5 Gbps, 150 meter) is set to 1. 5 d. B. SM power penalties vs. distance @10 G A. Xiang, SMU PHYSICS Industrial limit MM power penalties vs. distance @10 G Our appli. • • • 11

questions? ______________