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This paper proposes a kind of modulation architecture for wavelength-division-multiplexing passive optical network(WDM-PON)employing optical differential quadrature phase shift keying(DQPSK)downstream signals and two different modu-lation formats of re-modulated upstream signals.At the optical line terminal(OLT),10 Gbit/s signal is modulated with DQPSK.At the optical network unit(ONU),part of the downstream signal is re-modulated with on-off keying(OOK)or inverse-return-to-zero(IRZ).Simulation results show the impact on the system employing NRZ,RZ and carrier-suppressed return-to-zero(CSRZ).The analyses also reflect that the architecture can restrain chromatic dispersion and channel crosstalk,which makes it the best architecture of access network in the future.
This paper proposes a kind of modulation architecture for wavelength-division-multiplexing passive optical networks (WDM-PON) employing optical differential quadrature phase shift keying (DQPSK) downstream signals and two different modu- lation formats of re-modulated upstream signals. At the the optical line terminal (OLT), 10 Gbit / s signal is modulated with DQPSK.At the optical network unit (ONU), part of the downstream signal is re-modulated with on-off keying (OOK) or inverse-return- to- zero (IRZ). Simulation results show the impact on the system employing NRZ, RZ and carrier-suppressed return-to-zero (CSRZ). the analyzes also reflect that the architecture can restrain chromatic dispersion and channel crosstalk, which makes it the best architecture of access network in the future.