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Implementing a 10 Gb/s VCSEL Driven Transmitter for Short Range Applications

Implementing a 10 Gb/s VCSEL Driven Transmitter for Short Range Applications. Irfan N. Ali Michael C. Clowers David S. Fink Sean K. Garrison Jeff A. Magee. March 3, 2008. Georgia Institute of Technology School of Electrical & Computer Engineering. Project Objectives & Parameters.

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Implementing a 10 Gb/s VCSEL Driven Transmitter for Short Range Applications

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  1. Implementing a 10 Gb/s VCSEL Driven Transmitter for Short Range Applications Irfan N. Ali Michael C. Clowers David S. Fink Sean K. Garrison Jeff A. Magee March 3, 2008 Georgia Institute of Technology School of Electrical & Computer Engineering

  2. Project Objectives & Parameters Objective: Design and implement 10 Gb/s VCSEL transmitter for fiber optic Ethernet systems Client: Telecom service providers, server management groups, etc. Projected Unit Cost: Approx. $700

  3. Pattern Generator Laser Driver VCSEL Fiber Optic Cable BERT Technical Objectives • Design and implement a 10 Gb/s optical link • Digital/electrical input • Signal processing via laser driver • Electrical-Optical Signal conversion via VCSEL • Analog/optical output • Fiber optic data transmission • Bit-error-ratio tester (BERT) Driver Board Interface Board

  4. Technical Specifications

  5. IMOD Digital Input Laser Driver VCSEL IBIAS Design Approach • Three parallel approaches: • Modify MAXIM Inc. evaluation board • Populate existing Analog Devices (AD) driver board • Design driver board for TI chip

  6. Analog Devices Board • Pre-designed board • Needs to be populated and tested • Has analog control of output currents Digital Inputs Output to VCSEL Laser Driver

  7. Output to Interface Board Tuning Potentiometers Laser Driver Digital Inputs Maxim Inc. Evaluation Board • Evaluation board designed for laser diode • Interface board designed to deliver limited modulation and bias currents to VCSEL

  8. TI Driver Board Schematic • Driver board designed using PCB Artist • Provides digital control of output currents • Works with an interface board to connect to VCSEL MCU Input Digital Outputs Digital Inputs Power Supply

  9. VCSEL Interface Board Schematic • Interfaces the TI and MAXIM Inc. boards with the VCSEL • Includes resistance networks to limit current to VCSEL Analog VCSEL Output Analog VCSEL Output Digital Inputs Digital Input MAXIM Interface TI Interface

  10. System Configuration Note: SMA connections use coax cables Optical cables use LC connectors

  11. Demonstration Plan • Test by using the transmitter with a pattern generator to a send 10 Gb/s signal to error detector connected to optical receiver • Measure bit-error-ratio (BER) versus optical power at receiver and compare to acceptable value of BER at 10-10 • Capture optical eye diagram using a high-speed oscilloscope

  12. Problems/Issues • Transmission lines for interface board need to be designed for high speeds • SMA pad size on AD board does not match the SMA connector specification • VCSEL connection to AD board may be incompatible with available VCSELs • TI driver chip has 0.5 mm spacing between pins which will be difficult to solder by hand

  13. Budget & Cost Analysis • TI MCUs were bought as general use for the Senior Design Lab and therefore will not come out of the budget • Pre-designed PCB board provided free of charge from Dr. Ralph’s lab • Costs are based on total unit sale of 15000 over 5 years

  14. Projected Schedule Major Events Before Spring Break: • Completing PCB design and fabrication • Populating pre-designed board • Testing at TSRB

  15. Current Status • MAXIM Inc. evaluation board acquired • AD board partially populated • TI and interface boards designed • PCB mounting design initialized

  16. Questions/Comments Thank You

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