D. Barrow

Publications (2)0 Total impact

• Conference Proceeding: Gigabits in the home with plugless plastic optical fiber (POF) interconnects

  T. Wipiejewski, T. Moriarty, V. Hung, P. Doyle, G. Duggan, D. Barrow, B. McGarvey, M. O'Gorman, T. Calvert, M. Maute, V. Gerhardt, J.D. Lambkin
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  ABSTRACT: We have developed plugless optical transceivers for low cost optical networking with plastic optical fiber (POF). The transmission speed is 125 Mb/s for Ethernet applications and 1.25 Gb/s for Gigabit Ethernet and other high speed applications. The high speed modules for Gigabit transmission are based on a red VCSEL light source for the transmitter that matches the optical attenuation minimum of the plastic fiber media. The devices have demonstrated excellent reliability with more than 850,000 hours of mean-time-to-failure operating life time at elevated temperatures of 40degC. Automotive qualified, rugged resonant cavity LEDs (RCLEDs) are used for the lower speed modules. The plugless transceiver design enables the direct optical connection between the active components and standard POF without the need for special termination of the fiber. Only a simple cutting action is required. This enables low cost field installations.
  Electronics System-Integration Technology Conference, 2008. ESTC 2008. 2nd; 10/2008
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  Available from: firecoms.com

  Conference Proceeding: Red VCSELs for POF Data Transmission and Optical Sensing Applications

  T. Wipiejewski, G. Duggan, D. Barrow, B. McGarvey, V. Hung, T. Calvert, M. Maute, J. Lambkin
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  ABSTRACT: We have fabricated VCSELs in the visible red spectrum. The emission wavelength ranges from approximately 650 nm to 690 nm depending on application. The devices are grown on GaAs substrates by MOVPE and processed using standard VCSEL processing technology. The active layer consists of three InGaP quantum wells. The Bragg mirrors are AlGaAs/AlAs multilayer structures. The bottom mirror is n-doped, the top mirror is p-type doped. The threshold current of the devices is less than 2 mA. The maximum operating temperature is beyond 60degC. The optical output power is limited by eye-safety conditions to a maximum of 390 muW. The modulation bandwidth of the devices is in excess of 3 GHz even for low operating currents below 5 mA. This enables IEEE1394b S800 and Gigabit Ethernet transmission speed over POF as well as higher speed applications such as optical links for high definition TV. Any real application requires highly reliable devices and hence intensive life time testing of these red VCSELs has been undertaken. From aging test results applying various operating temperatures and currents we have inferred a conservative estimate for the activation energy of 0.6 eV. The 1%-time-to-failure (1%TTF) of the devices is over 100,000 hrs at use conditions. Continuous testing of more devices over thousands of operating hours is poised to improve reliability data further.
  Electronic Components and Technology Conference, 2007. ECTC '07. Proceedings. 57th;