The Ultimate Archetype 100 GbE per Lambda Technology Ilya Lyubomirsky and William A. Ling OIDA and Ethernet Alliance 100GbE per Lambda for Data Center Workshop June 12, 2014 Outline Key Messages Archetype 100 GbE per Lambda System Architecture Digital Modulation Techniques 100 GbE per Lambda for WDM Single-Mode Fiber Systems 100 GbE per Lane for Parallel Multi-Mode Fiber Systems Conclusions 100GbE per Lambda for Data Center Workshop 2014 2 100GbE per Lambda System Design Space Key Messages Device Technology: InP, SiP Transmitter: DML, EML, MZM Baud Rate: 25, 50,100 Gbaud Modulation: PAM, DMT, QAM, CAP, etc. Impairments: Thermal Noise, Laser RIN, DAC/ADC Quantization, Nonlinearities, RF Imperfections, Dispersion Equalization: CTLE, FFE/DFE, FFT/IFFT, MLSE FEC: Coding Gain, Latency, Power Engineering Tradeoffs: Cost, Power, Density, Reach How to proceed? 100GbE per Lambda for Data Center Workshop 2014 3 Who Is Your Archetype? Hero Ruler Magician Rebel Sage Source: http://www.soulcraft.co/essays/the_12_common_archetypes.html 100GbE per Lambda for Data Center Workshop 2014 4 Archetype 100 GbE per Lambda System Architecture Complexity in Tx DSP Simple Efficient Optics Complexity in Rx DSP SMF (or MMF) DSP DAC LDD DML PD TIA ADC DSP DFB 1310nm (or VCSEL 850nm) 25.8 Gb/s DFB 28 Gb/s VCSEL 100GbE per Lambda for Data Center Workshop 2014 5 400GbE 4-Lambda SMF Module Concept CDR 5 CDR CDR SerDes DSP/DAC LD DML DSP/DAC LD DML DSP/DAC LD DML DSP/DAC LD DML 4:1 LAN WDM SMF 4:1 LAN WDM SMF TEC 5 SerDes DSP/ADC TIA DSP/ADC TIA PIN DSP/ADC TIA PIN DSP/ADC TIA PIN PIN IEEE 802.3bs SMF CDAUI 8x50G lanes 100GbE per Lambda for Data Center Workshop 2014 6 What is the Best 100G Modulation Format for DML? Pulse Amplitude Modulation (PAM-M) Discrete Multi-Tone Modulation (DMT) Quadrature Amplitude Modulation (QAM) Carrierless Amplitude Phase (CAP) 100GbE per Lambda for Data Center Workshop 2014 7 Discrete Multi-Tone (DMT) Modulation Header Key Messages Message 1 Bullet style Message 2 Bullet style System Response Message 3 RF Bullet style + DML Each subcarrier samples only a small portion of system frequency response Very resilient to amplitude and phase ripples 100GbE per Lambda for Data Center Workshop 2014 8 Quadrature Amplitude Modulation (QAM) Header Key Messages Conventional QAM32 Message 1 Bullet style Message 2 Bullet style Message 3 Bullet style Optimized for DFB Tx Source: W. Ling, I. Lyubomirsky, O. Solgaard, “Digital Quadrature Amplitude Modulation with Optimized Non-Rectangular Constellations for 100 Gb/s Transmission by a Directly-Modulated Laser,” Optics Express, Vol. 22, Issue 9, pp. 10844-10857, 2014 100GbE per Lambda for Data Center Workshop 2014 9 Modulation Comparison Back-to-Back (B2B) 1.E-01 DMT PAM4 QAM32 QAM31 Optimum BER 1.E-02 1.E-03 IEEE 802.3bj PAM4 FEC 1.E-04 1.E-05 -9 -8 -7 -6 -5 -4 -3 -2 -1 0 1 Rx Average Power (dBm) 100GbE per Lambda for Data Center Workshop 2014 10 Modulation Comparison with 10km SMF Dispersion 1.E-01 DMT Dispersion = 10 ps/nm PAM4 QAM32 BER 1.E-02 1.E-03 IEEE 802.3bj PAM4 FEC 1.E-04 1.E-05 -9 -8 -7 -6 -5 -4 -3 -2 -1 0 1 Rx Average Power (dBm) 100GbE per Lambda for Data Center Workshop 2014 11 Modulation Comparison with RF Ripple 1.E-01 f ILripple A cos 2 f p A = 1 dB DMT PAM4 QAM32 fp = 2 GHz BER 1.E-02 1.E-03 IEEE 802.3bj PAM4 FEC 1.E-04 -9 -8 -7 -6 -5 -4 -3 -2 -1 0 1 Rx Average Power (dBm) 100GbE per Lambda for Data Center Workshop 2014 12 Modulation Comparison Summary PAM4 DMT QAM B2B Rx Sensitivity Dispersion RF Imperfections Power Dissipation Latency green = good yellow = ok red = potential trouble 100GbE per Lambda for Data Center Workshop 2014 13 400GbE Parallel MMF Module Concept CDR 5 CDR CDR 5 SerDes SerDes DSP/DAC LD VCSEL DSP/DAC LD VCSEL DSP/DAC LD VCSEL DSP/DAC LD VCSEL DSP/ADC TIA PIN DSP/ADC TIA PIN DSP/ADC TIA PIN DSP/ADC TIA PIN IEEE 802.3bs MMF CDAUI 8x50G lanes 100GbE per Lambda for Data Center Workshop 2014 14 VCSEL DMT Experiment OM3 Fiber Mode Mixer DMT Tx DSP DAC 56 Gs/s DMT Rx DSP ADC 80 Gs/s MM PD + TIA 850nm VCSEL 100 OM3 Transfer Functions CMOS DAC 90 Micram SiGe DAC Bit Rate (Gb/s) 80 70 60 50 40 30 20 0 50 100 150 200 250 300 350 OM3 Distance (m) Source: I. Lyubomirsky, et. al. “56 Gb/s Transmission over 100m OM3 using 25G-class VCSEL and Discrete Multi-Tone Modulation,” OIC, paper TuC2, Coronado, CA, May, 2014 100GbE per Lambda for Data Center Workshop 2014 15 Simulation Study on Feasibility of 100 GbE VCSEL Max. Bit Rate at BER = 10-3 achievable with DMT DAC/ADC ENOB = 6 bits 110 5 Prx = -3 dBm Prx = 0 dBm Response (dB, electrical) 120 VCSEL small signal response 90 80 70 -5 -10 -15 0 5 10 15 20 25 30 Frequency (GHz) 60 -120 50 40 -155 -150 -145 -140 RIN (dB/Hz) -135 -130 -125 Power/frequency (dB/Hz) Bit Rate (Gb/s) 100 0 VCSEL RIN -135 dB/Hz -130 dB/Hz -140 dB/Hz -125 -130 -135 -140 -145 -150 0 5 10 15 20 25 30 Frequency (GHz) 100GbE per Lambda for Data Center Workshop 2014 16 Next Step: Activate your 100GbE Archetype “Are there people in legend, history, mythology or religion that truly inspire you? Study them, and then become them.” - Deepak Chopra 100GbE per Lambda for Data Center Workshop 2014 17
© Copyright 2024 ExpyDoc
