Gigabit Ethernet PMD OptoLink Inc Status Report 8

Gigabit Ethernet PMD Opto-Link, Inc. – Status Report 8 Clif Kerr March 31, 2005

Gigabit Ethernet: Progress Summary Completed Tasks o o o Partial troubleshooting first board Build and test second board design First report completed and published to our website Next Week’s Tasks o o o Continue troubleshooting boards Design review for next fabrication Order additional parts

Gantt Chart

Board Construction o o o Built common-anode transmitter circuit for Emcore VCSEL Construction done over the weekend, but… No Emcore VCSEL in our possession to use it with until Tuesday.

Board Layout Review

Receiver Board Testing Receiver eye with no attenuation o o Receiver eye with 7 d. B optical attenuation Receiver circuit works, even when transmitter is connected and powered up. No appreciable signal loss with 7 d. B optical attenuation.

Transmitter Board Testing o Tx did nothing on Friday. n n o 5 V over VCSEL leads no signal whatsoever on the output Diagnosis n n VCSEL connected “backwards” or upside down Not blown, as we actually were trying to drive the monitoring photodiode

Transmitter Board Testing (cont. ) o Fixed the VCSEL orientation n n Transmitter signal with 3 d. B optical attenuation o “Eye” changed from complete noise to less random signal Still not an eye Similar for both AOC and Emcore VCSELs 2. 06 V across VCSEL, so in about the right operating range to laze Testing is ongoing

Current Budget Digi-Key BC 1252 CT-ND $ 0. 02900 100 $ 2. 90 Digi-Key RHM 20. 0 HCT-ND $ 0. 07600 10 $ 0. 76 Digi-Key RHM 100 HCT-ND $ 0. 07600 10 $ 0. 76 Digi-Key RHM 115 HCT-ND $ 0. 07600 10 $ 0. 76 Digi-Key 3296 W-102 -ND $ 2. 50000 5 $ 12. 50 Digi-Key 3296 W-253 -ND $ 2. 50000 5 $ 12. 50 Digi-Key 490 -1034 -1 -ND $ 0. 12000 10 $ 59. 00000 2 $ 118. 00 Express PCB $ 1. 20 Advanced Optical Components HFE 419 x-541 $ 14. 50000 4 $ 58. 00 Advanced Optical Components HFD 3180 -103 $ 10. 00000 4 $ 40. 00 Digi-Key CP-002 APJ-ND $ 0. 73000 6 $ Jameco 188525 $ 4. 20000 10 Shipping 4. 38 $ 42. 00 $ 13. 00 Total: $ 302. 26

Current Budget Part Description: Manufacturer: Mfg. Part Number: Vendor Part Number: CAP 10000 PF 50 V CERAMIC X 7 R 0603 BC Components VJ 0603 Y 103 KXACW 1 B C Digi-Key BC 1252 TR-ND 0. 00346 18 0. 06228 RES 30. 0 OHM 1/10 W 1% 0603 SMD Rohm MCR 03 EZPFX 30 R 0 Digi-Key RHM 30. 0 HTRND 0. 00203 1 0. 00203 RES 100 OHM 1/10 W 1% 0603 SMD Rohm MCR 03 EZPFX 1000 Digi-Key RHM 100 HTRND 0. 00203 3 0. 00609 RES 115 OHM 1/10 W 1% 0603 SMD Rohm MCR 03 EZPFX 1150 Digi-Key RHM 115 HTRND 0. 00203 1 0. 00203 RES 3. 00 K OHM 1/10 W 1% 0603 SMD Rohm MCR 03 EZPFX 3001 Digi-Key RHM 3. 00 KHTRND 0. 00203 1 0. 00203 POT 1. 0 K OHM 3/8" SQ CERM SL MT Bourns Inc 3296 W-1 -102 Digi-Key 3296 W-102 -ND 1. 092 1 1. 092 POT 10 K OHM 3/8" SQ CERM SL MT Bourns Inc 3296 W-1 -103 Digi-Key 3296 W-103 -ND 1. 092 1 1. 092 PCB Fabrication Run Express PCB Production Service Express PCB 1. 35438 1 1. 35438 AOC 2. 5 Gbps VCSEL AOC HFE 419 x-541 7. 25 AOC 1. 25/2. 5 Gbps ROSA AOC HFD 3180 -103 5 1 5 Total Per Board: Quantity/ Board: Unit Cost: Total Part Cost: 15. 86284

Next Week o o o Troubleshoot AOC and Emcore VCSEL circuits Order more parts Build aggressive circuit Update design for second fabrication Enjoy this beautiful spring weather