1. Group 2 - Project Update Feb 12. 2004 Tyler Helble

2. Progress Report Continued to learn about the components - Emitter, Detector information - VCSEL Specs - Creating an Optical Link Budget

3. Progress Report (cont) Tested Evaluation Board Revised Gantt Chart Optical Link Budget Rough Draft

4. Eval Board Test Connected test board in lab Familiarized ourselves with lab equipment Looked at eye diagrams and bit-error rate Recorded values with varying attenuation

5. Eval Board Test – Eye Diagrams

6. 40 dB

7. Eval Board Test – Eye Diagrams 50 dB

8. Eval Board Test – Bit-Error rate Sample Data: Attenuation BER 0-36 dB 0 E-9 37 dB.2 E-8 to.8 E-8 40 dB 5.4 E-5 50 dB 1.6E-1

9. Optical Link Budget - Standards Specifications From 802.3 Standard P_max (mW)1.0000 Extinction Ratio (dB)9.0000 P_min (mW)0.1259

10. Optical Link Budget - Variables VCSEL Parameters ParameterMINTYPMAX Threshold Current (mA)1.503.506.00 Slope Efficiency (mW/mA)0.060.150.30 Photodetector Parameters ParameterMINTYPMAX Responsivity (A/W)0.250.300.35 Capacitance (pF)0.35 0.40 Aperture Size (mm)1.20 1.50 Dark Current (nA)1.00 2.00

11. Optical Link Budget - Calculations VCSEL Current Requirements I_th (mA)eta (mW/mA)I_tot,MAX (mA)I_tot,MIN (mA)I_bias (mA)I_mod (mA) 1.500.0618.16673.598210.882414.5685 1.500.304.83331.91963.37652.9137 6.000.0622.66678.098215.382414.5685 6.000.309.33336.41967.87652.9137 Photodetector Output Currents R (A/W)I_o,MAX (mA)I_o, MIN (mA) 0.250.0444569850.005596803 0.350.0622397790.007835524

12. HFE4380-521HFE4384-522 Ith (mA)66 DC bias of laser (mA)7.2 Slope Efficiency (mW/mA)0.040.15 Modulation Current of TX (mA)30 Range of Power Output (mW)0.288 - 1.21.08 - 4.5 Range of Power Output (w/ Loss) (mW)0.144 - 0.60.54 - 2.25 Responsivity of Lasermate PD (A/W)0.4 Responsivity of Hamamatsu PD (A/W)0.47 Range of Current from Lasermate PD (uA)57.6 - 240216 - 900 Range of Current from Hamamatsu PD (uA)67.7 - 282253.8 - 1057.5