50Gb/s Per Lane: The Next Technology Rate. The Rate Debate Technology Exploration Forum 16 October 2014 Santa Clara, CA Chris Cole
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1 50Gb/s Per Lane: The Next Technology Rate The Rate Debate Technology Exploration Forum 16 October 2014 Santa Clara, CA Chris Cole
2 IEEE 400G Ethernet Rate/Modulation Debate 802.3bs today 50G bit rate per λ 100G NRZ PAM-4 PAM-4 DMT modulation modulation 50Gb/s NRZ 50Gb/s PAM-4 100Gb/s PAM-4 100Gb/s DMT 16 October
3 Historical Rate Progressions Data Rates Gb/s: Telecom: /Flex Ethernet / Storage (Fibre Channel) (4x) 64 InfiniBand (4x) Mainstream Technology Lane Rates Gb/s: October
4 Historical IEEE Ethernet SMF λ Rate Debates Ethernet Rate 10G 40G 100G 400G Task Force 802.3ae 802.3ba 802.3ba 802.3bs Project years Existing optics OC192 OC768 OC768 LR4 Existing λ rate 10G/λ 40G/λ 40G/λ 25G/λ Existing I/O rate 2.5G (3G) 10G 10G 25G Predicted next I/O (SerDes) rate λ rate debate 10G 25G 25G 50G 4x3G/λ v. 1x10G/λ 4x10G/λ v. 1x40G/λ 10x10G/λ v. 4x25G/λ 8x50G/λ v. 4x100G/λ Market Winner 10G/λ 10G/λ 25G/λ 50G/λ 16 October
5 802.3 SMF PMD λ Rate Debates Observations λ rate debates were always between rates in existing client optics 802.3bs SMF PMD λ rate debate breaks this precedent by considering rate (100G/λ) not in existing client optics 802.3ae 10G SMF PMD λ rate debates: adopt existing vs. next I/O (SerDes) rate for optics 802.3ba 100G SMF PMD λ rate debates: adopt existing vs. next I/O (SerDes) rate for optics 802.3ba 40G SMF PMD λ rate debate: adopt existing vs. many years out I/O (SerDes) rate 40G/λ argument: 1 laser is low cost & CMOS is free 802.3bs 400G SMF PMD λ rate debate adopt next vs. many years out I/O (SerDes) rate 100G/λ argument: 4 lasers are low cost & CMOS is free 16 October
6 40G Serial Example of Premature Standard 40G Serial Client OC768 and G.693 spec. in late 90s Based on assumption that client interfaces should be serial 156M 622M 2.5G 10G 40G Bleeding edge component limitations drove specifications Ex. -5dBm RX sensitivity limit resulted in bad specs. 1550nm λ 1dB CD Penalty Required changing CD penalty after many years of futile attempts to make production parts Nightmare to design and manufacture modules Transistor ft = 110GHz Interconnect technology: GPPO Packaging technology: gold boxes for optics and ICs Today s 100G/λ technology is similarly bleeding edge 16 October
7 1 st 40G Serial Module on Eval Card c October
8 Next Technology Rate Application Feasibility Application Support Feasibility 50G NRZ or PAM-4 100G PAM-4 or DMT 400G 10km & High-Loss duplex SMF Yes No 400G 2km duplex SMF Yes No 400G 500m PSM4 Yes Yes 400G Next Gen MMF Yes No 100G Next Gen SMF Yes Yes 100G Next Gen MMF Yes No 50G Serial SMF & MMF Yes No 40G Serial SMF & MMF Yes No 64x Fibre Channel Yes No 50G per lane Electrical I/O Yes No 50G per lane Backplane & Cu Cable Yes No 16 October
9 400G (8x50G λ) SMF PMD Example CFP2 400G module 16 October
10 200G (2x 2x50G λ) SMF PMD Example QSFP & CFP4 dual 100G module 16 October
11 40/50G (Serial λ) MMF PMD Example QSFP quad 40/50G (160/200G) module SFP 40/50G single lane module 16 October
12 100G SMF PMD Power Gen 1 LR4 CFP discrete EML: 20W Gen 2 LR4 CFP2 DML or MZ: 6W Gen 3 LR4 CFP4 DML: 4W Gen 4 LR4 QSFP28 DML: 3.5W Gen 4 CWDM4 QSFP28 DML: 3W Next Gen CWDM2 (2x50G/λ) MZ or DML Target: 2W Enables dual 100G (200G) QSFP and CFP4 Current 100G/λ proposals, even w/ advanced CMOS, at best match power of current LR4 or CWDM4 QSFP28 Not compelling 100G/λ Compelling Target: 1W Enables 100G SFP and quad 100G CFP4 and QSFP 16 October
13 Example of Fast Changing Technology Cautionary Note: adopting PAM-8 Baseline Proposal in 802.3bm would have been a serious mistake 16 October
14 100G/400G Standards Today are for >2020 Today Next Gen >2020 2x 50G λ NRZ or PAM-4 Re-Timed 4x 25G λ NRZ Re-Timed 1x 100G λ High volume Architecture 1x 100G λ PAM-4 or DMT Re-Timed Track record of predicting technology many years our is poor 16 October
15 50G/λ is the Right Next Step Same reason that crooks rob banks: It s where the money is Equivalently it s where the volume is Manageable optics technology risk Leverages next high-volume mainstream technology rate Optimally connects to 50G I/O Multiple applications that drive shared volume 400G SMF & MMF 2x density increase duplex SMF and MMF 100G 4x density increase duplex SMF and MMF 40/50G 64xFC Technology is sufficiently understood to standardize 16 October
16 100G/λ is >2020 Solution Standardization today is premature Bleeding-edge optics negate architecture advantage No power advantage over today s approach (4x25G/λ) Skips next high-volume mainstream I/O rate (50G) Niche application and rate for many years (>2020) Standardization will be done in the future when there is: Optics experience Mature components Compelling power (ex. 1W/100G) 100G electrical I/O architecture and volume visibility Multiple application volume to drive down cost Best way to derail promising advanced technology is to lock down today s incomplete understanding into bad specs. 16 October
17 50Gb/s Per Lane: The Next Technology Rate Thank you 16 October
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Features Supports 9.95Gb/s to 11.1Gb/s bit rates Hot-pluggable XFP footprint Maximum link length of 80km with SMF APD ROSA receiver XFP MSA package with duplex LC connector No reference clock required
Highlights: ISO/IEC SC25/WG3 Meeting Berlin: 02-06 06 May 2011. - Customer Premises Cabling -
1 ISO/IEC SC25/WG3 Meeting Berlin: 02-06 06 May 2011 - Customer Premises Cabling - Highlights: 1. ISO/IEC 24764 Data Centre Cabling Am.1 2. ISO/IEC 14763-2 Plan. & Install. final draft 3. ISO/IEC 14763-3
1.25Gbps GBIC Optical Transceiver, 20km Reach
1.25Gbps GBIC Optical Transceiver, 20km Reach Features Dual data-rate of 1.25Gbps/1.0625Gbps operation 1310nm FP laser and PIN photodetector for 20km transmission Duplex SC optical interface Standard serial
LONGLINE QSFP+ SR4. Features. Applications. Description. Page 1 of 13
LONGLINE QSFP+ SR4 Features 4 channels full-duplex transceiver modules Transmission data rate up to 10.5Gbps per channel 4 channels 850nm VCSEL array 4 channels PIN photo detector array Low power consumption
Methode Electronics. DM-317-XXXX 40 Gbps QSFP+ Passive Cable RoHS COMPLIANT. www.methode.com
DM-317-XXXX 40 Gbps QSFP+ Passive Cable RoHS COMPLIANT QSFP+ MSA compliant Hot-pluggable footprint Supports Digital Serial ID and User Memory Robust Die Cast Housing Small footprint to maximize port spacing