Abstract
The broadband access, the passive optical access in particular, can provide television channels in the order of 100, which has a huge impact on the consumer electronics industry. We can increase the capacity and speed of optical access networks if OOK(On-Off Keying) signal and PSK(Phase Shift Keying) signal can co-exist in the digital software PON(Passive Optical Network), where OOK is used in existing PON and PSK in the next generation system. The BER(Bit Error Rate) of co-existing PSK or QAM(Quadrature amplitude modulation) signals falls when the OOK signal extinction ratio is large. This problem can be offset by signal shaping. This paper focuses on a clipped signal sending scheme for low power optical access networks. The method removes the negative components from the modulated signal prior to optical signal conversion. This paper shows the received power vs BER performance can be improved by signal shaping even with clipped signals.
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