Multimode fiber media types for 802.3cd

Transcription

1 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 2 Laser Optimized Multimode Fiber Types Fiber Type EMB at 850 nm (MHz km) EMB at 953 nm (MHz km) OM NA OM NA WBMMF (OM4-W or OM5?) OM3 and OM4 designed for high bandwidth at 850 nm WBMMF designed high bandwidth over wide range of wavelengths

3 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: TR

4 EMB (MHz-km) 4 Range of EMB peak wavelengths for 5 OM4 fibers - EMB wavelength dependence Range of EMB for OM Shortest OM4 Peak l OM4 Fibers Longest OM4 Peak l Wavelength (nm)

5 TIA Presentation: 5 Range of EMB at 850 nm Low EMB at 840 nm Source: TR

6 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 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 OM EMB at 953 nm (MHz km) EMB at 850 nm (MHz km)

7 EMB (MHz km) 953 nm 7 Modeling of OM4 & WBMMF EMB wavelength dependence EMB 850nm & 953nm OM4 EMB 850 nm WBMMF EMB 850 nm EMB (MHz km) 850 nm

8 Number of Lanes (fibers or wavelengths) 8 WBMMF Required for Future higher speed Ethernet using SWDM GbE GbE 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 PAM bs 802.3cd 100Gb/s PAM bs Future PMDs PAM4 Bit rate per lane

9 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

10 BACKUP 10

11 Radius offset, mm OSA Counts 11 Primary cause of BER performance disparity Spectral coupling of VCSEL MMF modes 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 Equal radial Mode Delays Near Perfect DMD + Chrom. Disp n 1000 VCSEL Wavelength (nm) Low-order mode High-order mode Core Cladding H direction relative time, ps/m VCSEL spectral width = 0.425nm

12 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 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

13 Amplitude (arb) Modal-Chromatic Dispersion Interaction Standard Algorithm Output Pulse: No Chromatic Dispersion FWHM = 81.5 ps BW = 6435 MHz km CD BW = 6221 MHz km DMD Measurement, l = 850 nm 3 um 10 um 19 um E E E E E E-10 Time (s) E E E E E Output Pulse: With Chromatic Dispersion FWHM = 56.6 ps BW = 6435 MHz km CD BW = 9184 MHz km Panduit Algorithm E E E E E-10

14 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 = 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 = ps/m

15 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 Rx Power (dbm)

16 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 EMB (MHz km)

17 Center Wavelength (nm) Center Wavelength (nm) Center Wavelength (nm) 17 Three Transmitter spectral radial dependencies Lambda center X Lambda center Y Lambda center X Lambda center Y Lambda center X Lambda center Y Offset (mm) Offset (mm) Offset (mm) BERT XFP JDSU032 SFP+ 2M Dl c (nm) Dl (nm)

18 BER m Transceiver Performance B10 (R-Shifted) 1.0E E E E E E E E-10 10GbE Tx Variation, B10 (RS), 300m Length, 2/7/09 Dl c = 0.72nm BERT TX XFP SFP+ 1.0E E E-13 Dl c = 0.22nm Dl c = 0.53nm 1.0E-14 Rx Power (dbm)

19 19 Correlation Between Dl c and Dl 136 Transceivers (+2 esr4s) N = 136 R² = Dl c vs Dl rms 0.8 Dl c (nm) G esr4: Dl c = 0.10nm 0.28nm Dl rms = 0.15nm 0.20nm Dl rms (nm)

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