1. Optical Gigabit Ethernet Group 4 February 3, 2005 Ronen Adato

2. Progress Overview Tested Evaluation board Continued part research Created an Optical Link Budget Began contacting part vendors

3. Evaluation Board Testing Setup for BER testing; the clock was fed into the BER tester, thus the oscilloscope signal was triggered on itself Setup for viewing eye diagrams; the clock was used to trigger the oscilloscope signal, producing a better eye

4. Evaluation Board Testing Self triggered setup, signal PRBS 7 with 40 db attenuation Clock triggered setup, signal PRBS 7 with 40 db attenuation

5. Evaluation Board Testing Signal quality decreased with attenuation in general BER remained constant 0 db was too little attenuation BERs for signal PRBS 7 AttenuationBER 0 db1.2x10-1 10-70 db10-9 Signal PRBS 7, 0 db attenuation

6. VCSEL and PD Selection 6 possible VCSEL vendors Advanced Optical Components, Lasermate, Roithner Lasertechnik, Appointech, Oepic Inc. and TERAdian Inc. 6 possible PD vendors Optoway Inc., OSI Fibercomm, Appointech, Luxnet, Hamamatsu and OECA

7. VCSEL and PD Selection

9. Equations I = (P/η) + I th I max = (P max /η) + I th I min = (P min /η) + I th I bias = (I max + I min )/2 I mod = I max - I min

10. VCSEL and PD Selection

11. Equations P at PD = (P from VCSEL )(10 -(fiber loss/10) ) I out = R x P at PD

12. VCSEL and PD Selection Optical Link Budget The Limiting Amplifier (MAX3264) takes 5- 1200 mV The TIA (MAX3266) has 2.26 kΩ transimpedence So I out from the PD must be at least 2.212μA to drive the Limiting Amplifier The TIA also cannot take more than 4mA and operate normally

13. VCSEL and PD Selection Optical Link Budget The Laser Driver (MAX3287) can only produce current modulation between 2-30 mA Based on the necessary input current to the TIA we can determine which PDs have adequate responsivity The output of the Laser Driver determines which VCSELs will work

14. VCSEL and PD Selection All the PDs have adequate responsivities and thus worst case output currents The Advanced Optical Components HFE438x-521 VCSEL, with a worst case I mod of 43.705 is outside the range of the Laser Driver

15. Vendor Quotes VCSELs Lasermate: The part is available 1-9 units - $32.00 10 units - $25.00 10,000 units - $7.95 Roithner Lasertechnik: The part is discontinued, they have 10 left 25 Euros/ unit for all of them

16. Vendor Quotes PDs OSI Fibercomm FCI-125G-006HR: 9 are in stock 1-9 units - $10 101-500 units - $5 OSI Fibercomm FCI-125G-010HR: 12 are in stock 1-9 units - $10 101-500 units - $5

17. Vendor Quotes PDs Hamamatsu S5971: none are in stock $6.72 regardless, but a minimum order of $50

18. Additional Concerns The Oepic VCSEL is 10Gbps The company gives samples, so it may fit into our budget For the large scale budget it may be to costly It may not work with the other parts The rise/fall time on the Laser Driver data sheet is a minimum of 250, most of our VCSELs do not meet this requirement The capacitances of some of our PDs are high Lasermate also makes a SC-ROSA PD

19. GANTT Chart

20. Goals for Next Week Complete Optical Link Budget and choose components Build the test board (if the parts have come in) Begin financial budgeting Possibly order our VCSELs and PDs