ECE 4006 Presentation on Preliminary Results Group: G3 Member: Karen Cano, Scott Henderson, Di Qian.

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Presentation transcript:

ECE 4006 Presentation on Preliminary Results Group: G3 Member: Karen Cano, Scott Henderson, Di Qian

Overview STEP Procedure Name VCSELPD 1Component PurchaseCompletedMostly Completed 2Circuit Layout DesignCompleted 3 Etched PCB Board DesignCompletedNot Completed 4Circuit Assembly for 1) RadioShack BoardCompletedNot Completed 2) Etched PCB BoardNot Completed 5Circuit Testing for 1) RadioShack BoardCompletedNot Completed 2) Etched PCB BoardNot Completed

Circuit Layout for PD Optical connection on top, (SC - Light In). Electrical connections on left and right (SMA) R=1/(2*pi*f*C DET ), where C DET = 1.5 pF (from spec. sheet). So, R = 53.1Ω.(impedance of PD). Capacitors were chosen based on their frequency response at 1.25 GHz. From Murata’s site: C =.01uF.

Circuit Layout for the VCSEL Electrical connections on the left (SMA - In), optical connections on the right (SC - Light Out). Constraint: Circuit’s R TOT has to be 50Ω, due to equipment requirements. VCSEL’s R TYPICAL =25Ω (from spec.sheet) So, a 25Ω resistor was placed in series with the VCSEL.

Constructing the VCSEL Board Radio Shack purchased “through” boards SMA connectors, SMT components, and VCSELs Impracticalities of initial design Remedy for small holes and lack of a drill Problem: GTS-1250’s outputs are AC- coupled Bias-T applied and shown in new circuit

VCSEL Testing Procedure GTS-1250 New VCSEL board Old opto-board Scope Electrical connections and optical loop

Testing Results IEEE 802.3z standard mask application Bit error rate settings in scope New VCSEL vs. old VCSEL Failure of complete Tx module thus far

VCSEL PCB Design Five components: - SMT Resistor, - LED, - Power Connector, - 2K ohms Resistor, - SMA Connector

VCSEL PCB Design (Con’t) SMT Resistor – 0.1 inch LED – Two Leads 2K Ohms Resistor – 0.5 inch Power Connector – hole 0.2 x 0.1 inch

VCSEL PCB Design (Con’t) SMA Connector Bottom View

Conclusion (Short term goals) Ensure the delivery of the connectorized PD Making and testing the PCB for VCSEL Intergrating with modules from other groups.