Cesar Lugo November 7, 2002 Progress Report (October , 2002) Observed how the eye diagram was affected by changing the bias current of the VCSEL Observed how the eye diagram was affected by changing the modulation current of the VCSEL Prepared both boards for alignment testing Progress:

Cesar Lugo November 7, 2002 Planned Work (October , 2002) Alignment testing for VCSELs Alignment testing for PDs Submit redesign of PCB –Making a shorter path for I mod –Removing some of the ground plane under Pd to reduce capacitance –Removing extra power supply connector –Eliminate cap on POR pin on the laser driver Planned work:

Cesar Lugo November 7, 2002 Gantt Chart

Cesar Lugo November 7, 2002 Eye Diagrams of Various Bias Currents I bias mAI bias 10.0 mA I bias 8.55 mAI bias 7.3 mA

Cesar Lugo November 7, 2002 Eye Diagrams of Various Bias Currents I bias 6.05 mA I bias 3.74 mA I bias 5.03 mA I bias 4.37 mA