gigabit ethernet pmd ece135 group 2 – presentation 2 andrew meyerson february 3, 2005
TRANSCRIPT
![Page 1: Gigabit Ethernet PMD ECE135 Group 2 – Presentation 2 Andrew Meyerson February 3, 2005](https://reader030.vdocuments.us/reader030/viewer/2022033106/5697bff21a28abf838cbb90e/html5/thumbnails/1.jpg)
Gigabit Ethernet PMD
ECE135 Group 2 – Presentation 2
Andrew Meyerson February 3, 2005
![Page 2: Gigabit Ethernet PMD ECE135 Group 2 – Presentation 2 Andrew Meyerson February 3, 2005](https://reader030.vdocuments.us/reader030/viewer/2022033106/5697bff21a28abf838cbb90e/html5/thumbnails/2.jpg)
Gigabit Ethernet:Progress Summary
Updated Gantt chart Made initial assignment of
group responsibilities Reviewed IEEE 802.3z
Standard regarding the PMD module
Started researching VCSELs
Test eval board Preliminary optical link
budget
Select VCSELs and PDs/ROSAs
Complete optical link budget Build practice board Revise Gantt chart Order parts?
Completed Tasks Next Week’s Tasks
![Page 3: Gigabit Ethernet PMD ECE135 Group 2 – Presentation 2 Andrew Meyerson February 3, 2005](https://reader030.vdocuments.us/reader030/viewer/2022033106/5697bff21a28abf838cbb90e/html5/thumbnails/3.jpg)
Group Responsibilities
Andrew Meyerson – Administration, ordering, soldering
Clifton Kerr – Layout, design, testing Vinh Nguyen – Webpage, report writing Bryan Justice – Optical link budget, design,
testing, report writing
![Page 4: Gigabit Ethernet PMD ECE135 Group 2 – Presentation 2 Andrew Meyerson February 3, 2005](https://reader030.vdocuments.us/reader030/viewer/2022033106/5697bff21a28abf838cbb90e/html5/thumbnails/4.jpg)
Gantt Chart
![Page 5: Gigabit Ethernet PMD ECE135 Group 2 – Presentation 2 Andrew Meyerson February 3, 2005](https://reader030.vdocuments.us/reader030/viewer/2022033106/5697bff21a28abf838cbb90e/html5/thumbnails/5.jpg)
IEEE 802.3z PMD Initial Research
We will be building a Physical Medium Dependent (PMD) sublayer board
PMD should conform to the IEEE 802.3z specifications for type 1000BASE-SX (Short Wavelength Laser)
![Page 6: Gigabit Ethernet PMD ECE135 Group 2 – Presentation 2 Andrew Meyerson February 3, 2005](https://reader030.vdocuments.us/reader030/viewer/2022033106/5697bff21a28abf838cbb90e/html5/thumbnails/6.jpg)
802.3z Standard
PMD block diagram as found in the 802.3z standard
![Page 7: Gigabit Ethernet PMD ECE135 Group 2 – Presentation 2 Andrew Meyerson February 3, 2005](https://reader030.vdocuments.us/reader030/viewer/2022033106/5697bff21a28abf838cbb90e/html5/thumbnails/7.jpg)
802.3z Cont.
Transmit characteristics (from 802.3z standard)
![Page 8: Gigabit Ethernet PMD ECE135 Group 2 – Presentation 2 Andrew Meyerson February 3, 2005](https://reader030.vdocuments.us/reader030/viewer/2022033106/5697bff21a28abf838cbb90e/html5/thumbnails/8.jpg)
802.3z Cont.
Receive characteristics (from 802.3z Standard)
![Page 9: Gigabit Ethernet PMD ECE135 Group 2 – Presentation 2 Andrew Meyerson February 3, 2005](https://reader030.vdocuments.us/reader030/viewer/2022033106/5697bff21a28abf838cbb90e/html5/thumbnails/9.jpg)
802.3z Cont.
The standard also defines a worst case link power budget and penalties
This will probably be needed for determining the optical link budget
![Page 10: Gigabit Ethernet PMD ECE135 Group 2 – Presentation 2 Andrew Meyerson February 3, 2005](https://reader030.vdocuments.us/reader030/viewer/2022033106/5697bff21a28abf838cbb90e/html5/thumbnails/10.jpg)
802.3z Cont.
The standard also specifies how to test the PMD to ensure compliance
For example, the extinction ratio must be measured with a repeating K28.7 data pattern
The standard also specifies test values corresponding to the minimum level of compliance
For example, maximum high frequency optical jitter is specified
![Page 11: Gigabit Ethernet PMD ECE135 Group 2 – Presentation 2 Andrew Meyerson February 3, 2005](https://reader030.vdocuments.us/reader030/viewer/2022033106/5697bff21a28abf838cbb90e/html5/thumbnails/11.jpg)
VCSEL Research
Started looking at VCSELs Performed 4 Corner Analysis of:
– Advanced Digital Optics– Roithner Lasertechnik– Appointech– ThorLabs
Briefly examined:
![Page 12: Gigabit Ethernet PMD ECE135 Group 2 – Presentation 2 Andrew Meyerson February 3, 2005](https://reader030.vdocuments.us/reader030/viewer/2022033106/5697bff21a28abf838cbb90e/html5/thumbnails/12.jpg)
Four Corners Analysis for Roithner Lasertechnik TTR-D1
![Page 13: Gigabit Ethernet PMD ECE135 Group 2 – Presentation 2 Andrew Meyerson February 3, 2005](https://reader030.vdocuments.us/reader030/viewer/2022033106/5697bff21a28abf838cbb90e/html5/thumbnails/13.jpg)
Four Corners Analysis for Advanced Digital Optics HFE438x-521
Extinction Ratio (dB): 9.00000
Maximum Output Power Pmax (mW): 1.00000
Minimum Output Power Pmin (mW): 0.12589
VCSEL Model: Advanced Digital Optics HFE438x-521Cost:
VCSEL ParametersParameter: Symbol: MIN TYP MAX
Threshold Current (mA): Ith 3.50000 6.00000
Slope Efficiency (mW/mA): η 0.02000 0.04000 0.10000
VCSEL Current RequirementsIth η Imax Imin Ibias Imod
(mA) (mW/mA) (mA) (mA) (mA) (mA)3.50000 0.02000 53.50000 9.79463 31.64731 43.705373.50000 0.10000 13.50000 4.75893 9.12946 8.741076.00000 0.02000 56.00000 12.29463 34.14731 43.705376.00000 0.10000 16.00000 7.25893 11.62946 8.74107
![Page 14: Gigabit Ethernet PMD ECE135 Group 2 – Presentation 2 Andrew Meyerson February 3, 2005](https://reader030.vdocuments.us/reader030/viewer/2022033106/5697bff21a28abf838cbb90e/html5/thumbnails/14.jpg)
Four Corners Analysis for Appointech 850nm VCSEL Module
![Page 15: Gigabit Ethernet PMD ECE135 Group 2 – Presentation 2 Andrew Meyerson February 3, 2005](https://reader030.vdocuments.us/reader030/viewer/2022033106/5697bff21a28abf838cbb90e/html5/thumbnails/15.jpg)
Four Corner Analysis for ThorLabs VCSEL 780
![Page 16: Gigabit Ethernet PMD ECE135 Group 2 – Presentation 2 Andrew Meyerson February 3, 2005](https://reader030.vdocuments.us/reader030/viewer/2022033106/5697bff21a28abf838cbb90e/html5/thumbnails/16.jpg)
Four Corner Analysis for TechLabs VCSEL 850
![Page 17: Gigabit Ethernet PMD ECE135 Group 2 – Presentation 2 Andrew Meyerson February 3, 2005](https://reader030.vdocuments.us/reader030/viewer/2022033106/5697bff21a28abf838cbb90e/html5/thumbnails/17.jpg)
Other VCSEL Vendors
Lasermate– Link to datasheet for VCSEL with SC connector is
dead
Optek– Does not appear to have VCSEL model with SC
connectors
![Page 18: Gigabit Ethernet PMD ECE135 Group 2 – Presentation 2 Andrew Meyerson February 3, 2005](https://reader030.vdocuments.us/reader030/viewer/2022033106/5697bff21a28abf838cbb90e/html5/thumbnails/18.jpg)
Summary of VCSELs
The Roithner Lasertechnik TTR-D1 appears to be the best VCSEL so far in performance terms– Potential problems
Delivery time Currency costs
The most affordable with good performance appears to be the ThorLabs 850 option– Is it connecterized?
![Page 19: Gigabit Ethernet PMD ECE135 Group 2 – Presentation 2 Andrew Meyerson February 3, 2005](https://reader030.vdocuments.us/reader030/viewer/2022033106/5697bff21a28abf838cbb90e/html5/thumbnails/19.jpg)
PDs and ROSAs
Preliminary research has begun for selecting an appropriate PD or ROSA
Delay due to questions regarding which will be used
ROSAs are readily available online and it is just a function of finding a cheap one with the right connecters
![Page 20: Gigabit Ethernet PMD ECE135 Group 2 – Presentation 2 Andrew Meyerson February 3, 2005](https://reader030.vdocuments.us/reader030/viewer/2022033106/5697bff21a28abf838cbb90e/html5/thumbnails/20.jpg)
Evaluation Board Testing
![Page 21: Gigabit Ethernet PMD ECE135 Group 2 – Presentation 2 Andrew Meyerson February 3, 2005](https://reader030.vdocuments.us/reader030/viewer/2022033106/5697bff21a28abf838cbb90e/html5/thumbnails/21.jpg)
Evaluation Board Testing (cont)
Tested both PRBS7 and K285– Using the clock, found the eye diagram of both
signals with and without attenuation– Used the Bit Error Rate tester to find the BER of
the PRBS7 pattern
![Page 22: Gigabit Ethernet PMD ECE135 Group 2 – Presentation 2 Andrew Meyerson February 3, 2005](https://reader030.vdocuments.us/reader030/viewer/2022033106/5697bff21a28abf838cbb90e/html5/thumbnails/22.jpg)
Evaluation Board Testing (cont)
K285 with proper attenuation (above)Triggering itself (below)
PRBS7 with attenuation (above) without (below)
![Page 23: Gigabit Ethernet PMD ECE135 Group 2 – Presentation 2 Andrew Meyerson February 3, 2005](https://reader030.vdocuments.us/reader030/viewer/2022033106/5697bff21a28abf838cbb90e/html5/thumbnails/23.jpg)
Evaluation Board Testing (cont)
With attenuation, the BER of PRBS7 was measured to be 0E-9
With no attenuation, the BER of PRBS7 was measured to be 6.9E-2
![Page 24: Gigabit Ethernet PMD ECE135 Group 2 – Presentation 2 Andrew Meyerson February 3, 2005](https://reader030.vdocuments.us/reader030/viewer/2022033106/5697bff21a28abf838cbb90e/html5/thumbnails/24.jpg)
Next Week
Research and select parts– Look at more VCSELs– Look at PDs/ROSAs– Call vendors for more information about price,
availability, and whether the components are connecterized
Finalize optical link budget Build evaluation board Revise Gantt chart as necessary Order parts?
![Page 25: Gigabit Ethernet PMD ECE135 Group 2 – Presentation 2 Andrew Meyerson February 3, 2005](https://reader030.vdocuments.us/reader030/viewer/2022033106/5697bff21a28abf838cbb90e/html5/thumbnails/25.jpg)
References
IEEE Computer Society (2003). IEEE 802.3 Standard. New York: The Institute of Electrical and Electronics Engineers, Inc. Retrieved Thursday, January 20, 2005, from ECE 164.02 website: http://www.ee.duke.edu/~mbrooke/EE164.02/Spring_2004/group_2/index_files/8023.pdf
ECE164 Group 1 Presentations. (April 26, 2004). ECE164 Group 1 Website. Retrieved January 20, 2005 from http://www.ee.duke.edu/~mbrooke/EE164.02/Spring_2004/group_1/downloads.html
ECE164 Group 2 Presentations. (April 17, 2004). ECE164 Group 2 Website. Retrieved January 20, 2005 from http://www.ee.duke.edu/~mbrooke/EE164.02/Spring_2004/group_2/presentations.html