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Superposition of Next Generation PON to Existing PON's OOK Signals

Recent research into raising the speed and capacity of optical access networks has focused on converting RF (Radio Frequency) signals into optical signals. One approach to efficient transmission, combining wide spread OOK (ON-OFF Keying) systems with phase modulation, is being actively researched. However, studies to date have considered only the downlink. This paper focuses on the uplink of optical access networks and proposes a method for demodulating superimposed OOK and phase modulation signals.