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NLC Timing System Optical Fan Out Overview This system is configured as a single width VXI module. The Optical Fan Out module receives an optical input RF signal or Timing Signal, amplifies it and fans it out eight (8) ways. The unit is used for short runs where stabilized links are not required. A semiconductor amplifier and fan-out is used. The input and output power levels are monitored, and the gain of the module is adjustable. Functional Description The module receives the NLC Timing System RF clock on a fiber input. This optical signal is coupled (-10 dB) to an optical power detector which converts the clock and fiducial pulse to an electrical signal. The resulting electrical signal is amplified and fed to a peak detector, whose output is sampled by an Analog To Digital Converter (ADC). The output of the ADC is stored by the local microprocessor. A Semiconductor Amplifier (Gain of 10 dB), drives a one-to-eight (1:8) Fiber Fan Out through a (-10 dB) coupler. The Fiber Fan Out drives the module’s eight outputs through the front panel. The coupled output of the 10 dB coupler drives an optical power detector, whose electrical output is amplified and peak-detected, then sampled by the ADC. The local microprocessor’s program continually compares the input and output optical power levels, and controls the Semiconductor Amplifier’s Bias and Temperature to keep the Optical Fan Out module’s output at a constant level. The microprocessor also interfaces to the VXI backplane through some glue logic, for remote status and commands. OFO.doc 05/10/17 1