Keysight Technologies Inc. · NYSE:KEYS
Keysight Technologies — DesignCon 2025
41 slides from Keysight Technologies's conference presentation, Feb 27, 2025
Slide 1: OIF-CEI 112G Linear Pluggable Optics Validation
Linear Pluggable Optics OIF-CEI 112G Linear Pluggable Optics Validation Solutions for the Linear Pluggable Optics (LPO) Ecosystem John Calvin (Presenter) Sr. Datacenter Planner Dr. Hadrien Louchet Network and Datacenter Solutions 1
Slide 2: Agenda
Agenda • Ecosystem Challenges in DataCenter • Test & Validation Challenges • Keysight Solution for Validating and Testing LPO Interfaces • Contacts • Appendix 2
Slide 3: Ecosystem Challenges
Ecosystem Challenges The need to reduce latency and power consumption has made the move to linear interfaces an attractive alternative for data center interconnect. Keysight - Testing LPO Interfaces 3
Slide 4: Adapting Hyperscale DC to AI
Adapting Hyperscale DC to AI Requirements for backend (M2M) networking are changing TRX (SM) Spine switch → 2km Active optical cable (MM) Leaf switch → 100m Copper cable → 4m TOR switch Server Storage server Backend Networking New type of interconnect is required • More bandwidth (AI workloads 400G
Slide 5: Linear Drive Optics Types of 100G Modules
Credits: Semtech Linear Drive Optics Types of 100G Modules Tx Tx Tx Retimer Driver Retimer Driver CTLE Driver E/O E/O E/O Rx Rx Rx Retimer TIA TIA TIA O/E O/E O/E Non-Retimed or Full-Retimed Module Half-Retimed Module LPO/Linear Module (Tx/Rx DSP/CDR) (Tx DSP/CDR ) (Analog Driver + TIA only) • Highe
Slide 6: Linear Drive Optics Standardization
Linear Drive Optics Standardization (Oct’24) LPO MSA spec rev 1.0 expected Feb’26 OIF-CEI 112G linear specs are final OIF-CEI 224G linear project (proposal stage) Keysight - Testing LPO Interfaces 7
Slide 7: A multi-source supply chain strategy requires interoperability
A multi-source supply chain strategy requires interoperability Test and Validation Challenges Keysight - Testing LPO Interfaces 8
Slide 8: High-speed link in the data-center
High-speed link in the data-center C2M / VSR interface What is the module’s PHY chip for? Interoperability between host Optical interface and module (IEEE / OIF) Interoperability between modules (IEEE, MSAs)) MZM Ring EML VCSEL PHY TROSA The module PHY regenerates the signals coming from the client
Slide 9: Linear Pluggable Optics: Multiple challenges
Linear Pluggable Optics Multiple challenges LPO MSA Interoperability with LPO optics MZM Ring EML VCSEL CTLE + DSP driver TROSA TROSA DSP DSP Switch Switch ASIC ASIC no retimer! OIF-CEI IEEE CEI-112G-LINEAR 800GAUI-8 C2M Challenge #1: Validate host independently from module Challenge #2: Validate mo
Slide 10: Validating and Testing LPO interfaces Overview
Validating and Testing LPO interfaces Overview Validating switches & NIC host chips Validating LPO modules • Output and Input test for all ports • Module input for short, medium and long host channel • Standards distinguishes short, medium and long channels • Module output applying a worst-case (str
Slide 11: Linear/LPO System Overview
Validating and Testing LPO interfaces Linear/LPO System Overview 112G Linear/LPO 112G Linear/LPO Module Tx Block Module Rx Block TP0 TP1a TP1PMD TP2EL TP2 TP3EL TP4PMD TP4a TP4 TP1 TP3 TP5 Host Tx VGA Host Rx Tx host channel + Output Module Channel + Connector + Module Driver TIA Connector + Rx Host
Slide 12: TDECQ and EECQ metrics
Validating and Testing LPO interfaces Reference : TDECQ map and interpretation P802.3cd , Jonathan King TDECQ : Established Optical Metrics • TDECQ: TDECQ is a penalty operation that calculates how much noise can be added by an ideal receiver to the signal compared to an ideal (unequalized, noiseles
Slide 13: Host Testing: Host Output Test
5-tap, T-spaced, Sum to 1 Tap 1: 0.9 Max Host Testing Tap2: +/- 0.05 Max/Min Tap3-5: +/- 0.03 Max/Min Ref. Rx (scope) Target SER: 4.0E-4 Host Output Test EECQ Ceq switch VMA ASIC 2 gain stage 4th order BT filter BW: 42 GHz Tx FIR Implement using Channel SIRC. HCB TDECQ equalizer to mimic Tx FIR (e.g
Slide 14: Host Testing: Host Input Test
Host Testing Host Input Test BERT BER switch ASIC Test procedure TP4a HCB • Calibrate stress signal (next slide) • Apply stressed PRBS31Q pattern (resp. FEC encoded scrambled idle) BERT TP4a Host TP5 HCB Rx • Measure BER on the host (resp. FLR or FEC block stats) Keysight - Testing LPO Interfac
Slide 15: Host Input Test - Calibration
Host Testing Host Input Test - Calibration Stress conditioning BERT Pattern generator and interference source calibration channel Sampling scope w/ CDR HCB Amplitude, de- TP4a MCB TP4 EECQ emphasis, SJ+RJ VMA (AWGN) 4th order BT filter 2 gain stage 22-tap FFE 1-tap DFE BW: 40 GHz CTLE Implement
Slide 16: Validating LPO Modules: Module Input Test
Validating LPO Modules Module Input Test BERT MCB Sampling Scope w/ CDR FDA TP2 Ref. Rx (scope) TP0 TP1a TP2 TDECQ OER OMA Test procedure 4th order BT filter n-tap TDECQ BW: Nyquist using equalizer • Calibrate stress signal for short, medium and long host channel Channel SIRC (next slide) • Measu
Slide 17: Module Input Test - Calibration
Validating LPO Modules Module Input Test - Calibration Sampling scope w/ CDR BERT TP1 calibration channel Ref. Rx (scope) EECQ Ceq Amplitude, de- FDA MTF VMA emphasis, SJ, RJ 2 gain stage TP0 4th order BT filter TP1a BW: 42 GHz Tx FIR Calibration procedure Implement using Channel SIRC. TP2 • FDA u
Slide 18: Module output test – TP5 (LPO MSA)
Validating LPO Modules Module output test – TP5 (LPO MSA) Calibrated dstress Reference LPO host signal at TP3 FDA Error detector w/ equalizer TP3 TP4 TP5 Test procedure • Calibrate* stress signal TDECQ, OER, OMA at TP3 (SSPRQ) • Measure BER or FEC-stats at TP5 (PRBS31Q or FEC- scrambled idle) O
Slide 19: Module output test – TP4 (OIF_CEI & LPO MSA)
Validating LPO Modules Module output test – TP4 (OIF_CEI & LPO MSA) Calibrated dstress Sampling scope w/ CDR signal at TP3 TP3 TP4 EECQ VMA Ceq 4th order BT filter 2 gain stage 22-tap FFE 1-tap DFE BW: 40 GHz CTLE Implement using Test procedure Channel SIRC. • Calibrate* stress signal TDECQ, OER,
Slide 20: Testing and Validating LPO interfaces
Testing and Validating LPO interfaces Keysight solution for validating and testing LPO interfaces Keysight - Testing LPO Interfaces 22
Slide 21: Keysight Solution for Validating and Testing LPO Interfaces
Keysight Solution for Validating and Testing LPO Interfaces LPO module N1092x Optical sampling oscilloscope w/ N1060A 64Gbd integrated CDR 85GHz sampling scope w/ integrated 64Gbd CDR Module Module Output Test Input Test SW Description Interface N4917BSCB Optical RX Test for IEEE 802.3bs/cd Module N
Slide 22: Keysight Solution: LPO-capable Host
Keysight Solution for Validating and Testing LPO Interfaces LPO-capable Host N1060A 85GHz sampling scope with integrated 64Gbd CDR switch ASIC Host Output Host Input Test Test SW Description Interface N1010A FlexDCA Host Output Test N109212CA Electrical TX Test for OIF-CEI 112G on roadmap Host Input
Slide 23: FFE & DFE co-optimization
Keysight Solution for Validating and Testing LPO Interfaces FFE & DFE co-optimization 22-tap FFE 1-tap DFE 2 gain stage CTLE; 22-Tap FFE+1 Tap DFE Adjusted for lowest ISI at unity gain (manual optimization) Legacy equalizer • Manual correction for CTLE gain • Independent optimization of FIR and DFE
Slide 24: LPO Module Validation Solution
LPO Module Validation Solution Module Output TP1/TP5 New Tx FIR must be tuned BER or FEC margin M8050A N1060A Linear Optics N1092A (DCA+CDR) New tune driver gain TP1a/TP4 and CTLE gain new EECQ (“electrical TDECQ”) Ceq, SNDR, Jitter, Linearity new reference equalizer structure TP2/TP3 TDECQ, OMA, ER
Slide 25: LPO module – Fully automated functional testing
Keysight solution LPO interfaces LPO module – Fully automated functional testing (MFG) Optical switch 4-port 800G Interconnect Tester (specs) (Keysight or 3rd party) - DAC,ACC, AEC, retimed and LPO modules FlexOTO – solution bundle - PRBS & FEC statistics, eye analysis Automated testing for multiple
Slide 26: LPO Modules Validation Solution Hardware Overview
* According to “LPO MSA” LPO Modules Validation Solution Hardware Overview Model options Conformance* Functional comments TP2 TP4 M8050A -BU2 M8050A Can be replaced by M8040A BERT (tbc) M8009A -061/ -0G3 Opt. A Opt. A - DCA-X M8042A -0G1/-G64/-0G4 Opt. A Opt. A - M8043A -0A1/-A64/-0A3 (x) - BERT at
Slide 27: LPO Host Validation Solution Hardware Overview
LPO Host Validation Solution Hardware Overview * According to OIF-CEI 112G linear Model option Conformance* comment TP1a TP4a M8050A M8009A -061/ -0G3 - X Can be replaced by M8040A BERT (tbc) M8042A -0G1/-G64/-0G1/-0G4 - X DCA-X N1000A -PLK /-STB X X N1060A -050/-EVA/-264/PTB/-JSA X X SW Tx app - X
Slide 28: Appendix
Appendix Keysight - Testing LPO Interfaces 30
Slide 29: Keysight Testing LPO Solutions
Keysight Testing LPO Solutions Keysight participation in industry standards ✓ OIF CEI-112G-Linear project o Technical contributions (EECQ, overview, Tx test ) o Partnering with industry (MACOM, Eoptolink, Innolight, etc.) ✓ LPO MSA member ✓ LPO test dry run at InfiniBand Plugfest’24 Keysight solutio
Slide 30: Keysight Testing LPO Solutions: lab and demos
Keysight Testing LPO Solutions LPO setup in Keysight's lab LPO validation station at IBTA plugfest 24 LPO validation demo at OFC’24 LPO/RTLR validation at OFC’24 OIF-CEI interop demo at OFC’24 (dry run) Keysight MoI for LPO testing Keysight - Testing LPO Interfaces 32
Slide 31: Keysight track record testing LPO
Keysight track record testing LPO Keysight participation in industry standards ✓ OIF CEI-112G-Linear project o Technical contributions (EECQ, overview, Tx test ) o Partnering with industry (MACOM, Eoptolink, Innolight, etc.) ✓ LPO MSA member ✓ LPO test dry run at InfiniBand Plugfest’24 ✓ LPO interop
Slide 32: Keysight Method Of Implementation for LPO MSA and OIF-CEI Linear
Keysight Method Of Implementation for LPO MSA and OIF-CEI Linear (Available on Request) Keysight - Testing LPO Interfaces 34
Slide 33: Keysight LDO demonstration (ECOC'23)
Keysight LDO demonstration Keysight at OIF-CEI-Linear interop demo (ECOC’23) G800GE Traffic Generator Module Module HCB Module Broadcom TH5 switch N1000A DCA-X mainframe N1092x DCA-M Oscilloscope with N1060A “MegaModule” with built-in CDR TP2 TP1a N1092x DCA-M Oscilloscope M8040A/M8050A Pattern Gene
Slide 34: Keysight LDO demonstration (OFC'24)
Keysight LDO demonstration Keysight at OIF-CEI-Linear interop demo (OFC’24) Broadcom TH5 switch Module Multimode (VCSEL) LPO Module N1092x DCA-M Oscilloscope N1077B CDR Keysight - Testing LPO Interfaces 36
Slide 35: Keysight LDO demonstration (OFC'24)
Keysight LDO demonstration Keysight at OIF-CEI-Linear interop demo (OFC’24) N1092x DCA-M Oscilloscope M8040A/M8050A Pattern Generator (PG) with built-in CDR TP1a Wilder Opt Tx LPO eval MCB board TP4 Keysight - Testing LPO Interfaces 37
Slide 36: Keysight LDO layer 1 validation test
Keysight LDO layer 1 validation test IBTA interop plugfest 24 M8050A & DCA-X validation setup Keysight - Testing LPO Interfaces 38
Slide 37: Keysight LDO demonstration: OFC'24 booth
Keysight LDO demonstration Keysight booth at OFC’24 Linear Drive Optics Test Demonstration [click to view demo] Keysight - Testing LPO Interfaces 39
Slide 38: Keysight LDO demonstration: ECOC'24 booth
Keysight LDO demonstration Keysight booth at ECOC’24 TP5 LPO vs RTLR Demonstration TP2 TP4 N1092x G800GE AresOne N1060A [click to view demo] Keysight - Testing LPO Interfaces 40
Slide 39: Power supply for MCB cooling fan
Power supply for MCB cooling fan (48V) set as +24 V and -24 V Laptop running Wilder MCB GUI N1078A DCA-X N1092A G800GE Wilder MCB Keysight - Testing LPO Interfaces Mice: G800 MCB GUI DCA 41
Slide 40: Lab Setup 7/31/23 – 8/3/23
Lab Setup 7/31/23 – 8/3/23 SM Fiber (FC to FC) Monitor – N1000A with N1060A Linux TightVNC: 141.121.85.219 (PW ?) N1092A Samtec Bulls Eye G800GE SW Coax FlexDCA Cable A01/B01 /32 Slot 5 IXIA G800GE N1078A (OSFP+Coax) FlexDCA 141.121.84.142 Slot 6 (browser) A/B Odd A/B Eoptolink /32 Even 800G LPO Coa
Slide 41: LPO validation setup (IBTA plugfest, April 24)
TP2 & TP4 measurements LPO validation setup (IBTA plugfest, April 24) Retimed module for optical input test at TP3 TP2 TP4 DUT (LPO) Host Tx (M8050A PG) TP3 TP0 Keysight - Testing LPO Interfaces 43