1 Multimode fiber media types for 802.3cd P802.3cd, Fort Worth, Texas September 12-16, 2016 Rick Pimpinella Jose Castro Brett Lane Panduit Labs, Panduit Corp.
2 Laser Optimized Multimode Fiber Types Fiber Type EMB at 850 nm (MHz km) EMB at 953 nm (MHz km) OM3 2000 NA OM4 4700 NA WBMMF (OM4-W or OM5?) 4700 2470 OM3 and OM4 designed for high bandwidth at 850 nm WBMMF designed high bandwidth over wide range of wavelengths
3 TIA Round Robin Report Used for Specifying WBMMF CD Standard MMF Round Robin Participants 1. Corning 2. OFS 3. Panduit 4. Prysmian 5. J Fiber 6. YOFC Source: TR42.12-2015-06-022
EMB (MHz-km) 4 Range of EMB peak wavelengths for 5 OM4 fibers - EMB wavelength dependence Range of EMB for OM4 15000 14000 13000 12000 11000 10000 9000 8000 Shortest OM4 Peak l OM4 Fibers Longest OM4 Peak l 7000 6000 5000 4000 3000 2000 1000 800 820 840 860 880 900 920 940 960 980 1000 1020 Wavelength (nm)
TIA 42.12 Presentation: 5 Range of EMB at 850 nm Low EMB at 840 nm Source: TR42.12-2015-06-013
6 Modeling of OM4 EMB wavelength dependence Simulation parameters Fibers with both perfect alpha profiles and perturbed refractive index profiles Magnitude of index perturbation normally distributed w/ standard deviation ~10-4 Population of 40000 MMFs per wavelength generated over the range 830 nm to 980 nm Wavelengths varied in 1 nm steps Total fibers-wavelength combination = 6 million Blue dots represent the universe of MMFs including OM3 and OM4 12000 EMB at 953 nm (MHz km) 11000 10000 9000 8000 7000 6000 5000 4000 3000 2000 1000 0 2000 3000 4000 5000 6000 7000 8000 9000 10000 11000 12000 EMB at 850 nm (MHz km)
EMB (MHz km) 953 nm 7 Modeling of OM4 & WBMMF EMB wavelength dependence 10000 9000 8000 7000 6000 5000 4000 3000 2000 EMB 850nm & 953nm OM4 EMB Population @ 850 nm WBMMF EMB Population @ 850 nm 1000 4700 6700 8700 10700 12700 14700 EMB (MHz km) 850 nm
Number of Lanes (fibers or wavelengths) 8 WBMMF Required for Future higher speed Ethernet using SWDM 16 400GbE 10 100GbE 8 4 MMF 40GbE MMF 100GbE 200GbE WBMMF Parallel optics 50 GbE PAM4 x 4 l s = 200GbE per fiber 800GbE 4 fiber pairs 2 Breakout Breakout 100GbE Breakout 400GbE 1 10GbE 25GbE 50GbE Duplex MMF 200GbE 1 fiber pair 10Gb/s 802.3ba 25Gb/s 802.3bm 802.3by 50Gb/s PAM4 802.3bs 802.3cd 100Gb/s PAM4 802.3bs Future PMDs PAM4 Bit rate per lane
9 Conclusions Inclusion of WBMMF as a media type option for P802.3cd depends on which 100G solution is adopted Required for SWDM Not Required for parallel optics (SR2) For SWDM, OM3 & OM4 EMB is not specified for l s 860 nm Only WBMMF can be specified for 100G SWDM-2 PMDs will require different MMF types for different data rates For parallel optics i.e., 100GBASE-SR2 WBMMF provides no benefit (modal and chromatic dispersions are the same as OM4) Concerns Including or excluding MMF media types for 50/200G vs 100G will confuse customers The use of OM4 for SWDM can result in channel failures Premature to specify SWDM or include Wideband MMF in 802.3cd
BACKUP 10
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 Radius offset, mm OSA Counts 11 Primary cause of BER performance disparity Spectral coupling of VCSEL MMF modes 7000 6000 5000 VCSEL Spectrum BER VCSEL Scan 1 Conventional system models assume homogenous fiber coupled spatialspectral distribution versus fiber radius Modal and chromatic dispersion effects remain independent 4000 3000 2000 Equal radial Mode Delays Near Perfect DMD + Chrom. Disp n 1000 VCSEL 0 847.5 847.7 847.9 848.1 848.3 848.5 848.7 848.9 849.1 849.3 849.5 849.7 Wavelength (nm) Low-order mode High-order mode Core Cladding 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0-1 -H direction relative time, ps/m VCSEL spectral width = 0.425nm
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 Radius offset, mm 12 Actual VCSEL spatial-spectral coupling into MMF Radial Spectral Dependency Core Cladding Short wavelengths couple to high-order modes Long wavelengths couple to low-order modes 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0-1 There is a significant fiber coupled spatialspectral distribution Shorter spectral components preferentially coupled to larger fiber radii Interaction of modal and chromatic dispersion -H direction Peak shift (P-shift) Delay between 5 & 19mm relative time, ps/m Resultant DMD due to Modal Chromatic Dispersion
Amplitude (arb) Modal-Chromatic Dispersion Interaction Standard Algorithm 0.40 0.35 0.30 0.25 Output Pulse: No Chromatic Dispersion FWHM = 81.5 ps BW = 6435 MHz km CD BW = 6221 MHz km 1.00 0.90 0.80 0.70 DMD Measurement, l = 850 nm 3 um 10 um 19 um 0.60 0.50 0.40 0.30 0.20 0.10 0.00 3.5E-10 4.0E-10 4.5E-10 5.0E-10 5.5E-10 6.0E-10 Time (s) 0.20 0.15 0.10 0.05 0.00 4.0E-10 4.5E-10 5.0E-10 5.5E-10 6.0E-10 0.07 0.06 0.05 0.04 Output Pulse: With Chromatic Dispersion FWHM = 56.6 ps BW = 6435 MHz km CD BW = 9184 MHz km Panduit Algorithm 0.03 0.02 0.01 0.00 6.000E-10 6.500E-10 7.000E-10 7.500E-10 8.000E-10
14 System Performance versus Fiber Bandwidth Two fibers from same cable with the same EMB (similar DMD) L = 548 m Ti:Sapphire Laser - DMD L-Shifted R-Shifted Blue Fiber EMB = 4540 MHz km DMD inner = 0.12 ps/m DMD outer = 0.15 ps/m DMD sliding = 0.11 ps/m DMD P-Shift = -0.098 ps/m Brown Fiber EMB = 4540 MHz km DMD inner = 0.12 ps/m DMD outer = 0.13 ps/m DMD sliding = 0.13 ps/m DMD P-Shift = +0.096 ps/m
Bit Error Rate 15 Channel Performance Difference Same EMB Two fibers in same cable with the same EMB L = 548 m 1.E-03 1.E-04 1.E-05 1.E-06 Brown 1.E-07 EMB = 4540 MHz km 1.E-08 1.E-09 Blue EMB = 4540 MHz km 1.E-10 1.E-11 1.E-12-13.5-12.5-11.5-10.5-9.5-8.5 Rx Power (dbm)
Bit Error Rate (RX = -11 dbm) 5 Orders System Performance vs. Fiber Bandwidth System Performance (BER) versus Fiber Bandwidth Correlation Bit Error Rate Testing 10GBASE-SR compliant test mainframe Identical TX & RX Same fiber length, 300 m 1.E-03 Fiber Samples: OM3 included OM4 N = 100 Three fiber manufacturers Various cable constructions & bare fiber 16 1.E-04 1.E-05 OM3: EMB 2000MHz*km (Reach 300m) OM4: EMB 4700MHz*km (Reach 550m) 1.E-06 1.E-07 1.E-08 25% Failures N = 100 L = 300 m 1.E-09 1.E-10 1.E-11 1.E-12 1.E-13 1.E-14 1000 2000 3000 4000 5000 6000 7000 8000 EMB (MHz km)
Center Wavelength (nm) Center Wavelength (nm) Center Wavelength (nm) 17 Three Transmitter spectral radial dependencies 848.85 848.75 Lambda center X Lambda center Y 849.85 849.75 Lambda center X Lambda center Y 850.85 850.75 Lambda center X Lambda center Y 848.65 849.65 850.65 848.55 848.45 848.35 848.25 848.15 848.05 847.95 847.85-24 -16-8 0 8 16 24 Offset (mm) 849.55 849.45 849.35 849.25 849.15 849.05 848.95 848.85-24 -16-8 0 8 16 24 Offset (mm) 850.55 850.45 850.35 850.25 850.15 850.05 849.95 849.85-24 -16-8 0 8 16 24 Offset (mm) BERT XFP JDSU032 SFP+ 2M Dl c (nm) 0.72 0.53 0.22 Dl (nm) 0.45 0.34 0.23
-14.5-14.0-13.5-13.0-12.5-12.0-11.5-11.0-10.5-10.0-9.5-9.0-8.5-8.0-7.5-7.0 BER 18 300m Transceiver Performance B10 (R-Shifted) 1.0E-03 1.0E-04 1.0E-05 1.0E-06 1.0E-07 1.0E-08 1.0E-09 1.0E-10 10GbE Tx Variation, B10 (RS), 300m Length, 2/7/09 Dl c = 0.72nm BERT TX XFP SFP+ 1.0E-11 1.0E-12 1.0E-13 Dl c = 0.22nm Dl c = 0.53nm 1.0E-14 Rx Power (dbm)
19 Correlation Between Dl c and Dl 136 Transceivers (+2 esr4s) 1.4 1.2 1.0 N = 136 R² = 0.3056 Dl c vs Dl rms 0.8 Dl c (nm) 0.6 0.4 0.2 40G esr4: Dl c = 0.10nm 0.28nm Dl rms = 0.15nm 0.20nm 0.0-0.2-0.4 0 0.1 0.2 0.3 0.4 0.5 0.6 Dl rms (nm)
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