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Project GabE ECE 135 – Spring 2005 Week 9

Project GabE ECE 135 – Spring 2005 Week 9. Omar Al-Jadda Patrick Crosby Adam Durity. Rahmin Sarabi. Gantt Chart. Progress Report. Posted completed Midterm report to website Tested two Tx’s Tested and verified functioning Rx. Tx Testing. First test yielded non-working circuit

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Project GabE ECE 135 – Spring 2005 Week 9

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  1. Project GabEECE 135 – Spring 2005Week 9 Omar Al-Jadda Patrick Crosby Adam Durity Rahmin Sarabi

  2. Gantt Chart

  3. Progress Report • Posted completed Midterm report to website • Tested two Tx’s • Tested and verified functioning Rx

  4. Tx Testing • First test yielded non-working circuit • Laser driver not powered • PROBLEM: ground pins from power supply not grounded on board • SOLUTION: soldered a connection to ground plane FRONT BACK

  5. Tx Testing • Laser Driver now powered successfully • Signal trace performed to VCSEL INPUT OUTPUT from Laser Driver

  6. Tx Testing • MODSET potentiometer closes and opens eye • We will set to meet modulation current requirements Tx output - high resistance Tx output - low resistance

  7. Tx Testing • VCSEL did not lase on both boards • Connected to pattern generator’s optical receiver • Rx LOS indicator came on - VCSEL off • Dr. Brooke’s approach to determine appropriate POT settings

  8. Rx Testing • Tested with input from pattern generator • Very good eye pattern

  9. Upcoming Week • Address lasing failure • Build second Rx • Revise design and schematic for second board run • Order second board

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