Proceedings PaperSampling And Downconverting Avalanche Photodiode Receivers For Future High-Speed Optical Network Applications
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This paper describes the application of avalanche photodiodes (APD's) as frequency downconverters and high-isolation sampling gates. Frequency downconversion or mixing is necessary in subcarrier multiplexed (SCM) optical networks whilst sampling techniques are required in time-division-multiple-access (TDMA) systems. Two novel subscriber access node receiver designs are considered. The first features a Germanium APD in an optoelectronic phase-locked-loop (OPLL) circuit configuration for SCM networks. This design minimises the high-speed component count by performing the phase comparison (mixing) function within the APD. A second circuit technique, described for the first time, illustrates the use of a III-V APD as a high isolation sampling gate. Complex (and expensive) high-speed logic functions are therefore not required for TDMA broadcast optical networks. A prototype OPLL receiver has shown a sensitivity of -35 dBm at 1.3 μm wavelength (100 % optical modulation depth) for 16.5 dB signal-to-noise ratio in 36 MHz bandwidth.