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

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Presentation transcript:

Group 2 - Project Update Feb Tyler Helble

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

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

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

Eval Board Test – Eye Diagrams

40 dB

Eval Board Test – Eye Diagrams 50 dB

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

Optical Link Budget - Standards Specifications From Standard P_max (mW) Extinction Ratio (dB) P_min (mW)0.1259

Optical Link Budget - Variables VCSEL Parameters ParameterMINTYPMAX Threshold Current (mA) Slope Efficiency (mW/mA) Photodetector Parameters ParameterMINTYPMAX Responsivity (A/W) Capacitance (pF) Aperture Size (mm) Dark Current (nA)

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) Photodetector Output Currents R (A/W)I_o,MAX (mA)I_o, MIN (mA)

HFE HFE Ith (mA)66 DC bias of laser (mA)7.2 Slope Efficiency (mW/mA) Modulation Current of TX (mA)30 Range of Power Output (mW) Range of Power Output (w/ Loss) (mW) Responsivity of Lasermate PD (A/W)0.4 Responsivity of Hamamatsu PD (A/W)0.47 Range of Current from Lasermate PD (uA) Range of Current from Hamamatsu PD (uA)