Project GabE ECE 135 – Spring 2005 Week 9

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Presentation transcript:

Project GabE ECE 135 – Spring 2005 Week 9 Rahmin Sarabi Omar Al-Jadda Patrick Crosby Adam Durity

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 Laser driver not powered PROBLEM: ground pins from power supply not grounded on board SOLUTION: soldered a connection to ground plane FRONT BACK

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

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

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

Rx Testing Tested with input from pattern generator Very good eye pattern

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