Versatile Link System Status Report Annie Xiang on behalf of WP1.1 Group SMU Physics March, 2010 ____________________________

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

System Study Previously Designed and fabricated house version SFP+ carrier boards, running up to 10Gbps 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 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 ____________________________ 3A. Xiang, SMU PHYSICS oTx oRxoTx oRx In detector P2P

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 ____________________________ 4A. Xiang, SMU PHYSICS

System Level Specification Cross reference to industrial standards IEEE 802.3ae, 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 Electrical parameters are to be emerged with GBT development The following table specifies single mode standard and versatile transceiver optical transmit interface ____________________________ 5A. Xiang, SMU PHYSICS Parameters10GBASE-LR400-SM-LC-M800-SM-LC-IVTRx/TRx-SM Average launch power (max) (dBm) Average launch power (min) (dBm) OMA min (mW/dBm) / / Extinction ratio (min) (dB)3.5- RIN 12 OMA (max) (dB/Hz) Transmitter eye mask definitionSee plot 4GFC scale Transmitter & dispersion penalty (max) (dB) 3.2- (1) Rise/Fall Time (20%-80%) (ps) Total Jitter UIp-p Deterministic Jitter UIp-p-0.26-

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. ____________________________ 6A. Xiang, SMU PHYSICS

Link Budget ____________________________ Three scenarios fit budget, but MM-downlink requires more power, or Use in outer range (>40cm radius) to reduce rad-penalties, or, Pick components to comply with a tighter specification, i.e., Tx OMA ParametersMM-uplinkMM-downlinkSM-uplinkSM-downlink Transmit OMA min-3.8dBm -3.2dBm Receiver sensitivity OMA max-11.1dBm -12.6dBm Power budget7.3 dB 9.4 dB Fiber attenuation0.6dB 0.1dB Connection and splice loss1.5dB 2dB Allocation for penalties5.2 dB 7.3 dB TDP and other penalties1 dB 1.5 dB Tx radiation penalties---- Rx radiation penalties-7dB-5 dB Fiber radiation penalties (cold)1.0dB -- Meet budgetOknot yetOk Safety margin3.2dB-3.8dB5.8dB0.8dB 7A. Xiang, SMU PHYSICS

Link Budget In FC and GbE 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 ____________________________ 8A. Xiang, SMU PHYSICS

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 1.5dB ____________________________ 9A. Xiang, SMU PHYSICS

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 ____________________________ 10J.Ye, A. Xiang, SMU PHYSICS

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 (850nm, 5Gbps, 150 meter) is set to 1dB. Penalties limit for SM link (1310nm, 5Gbps, 150 meter) is set to 1.5dB. ____________________________ 11A. Xiang, SMU PHYSICS MM power penalties vs. power penalties vs. Industrial limit Our appli. Industrial limit

____________________________ questions?