Bidirectional 40 Gb/s/λ, 100 km-reach, channel-reuse WDM-PON employing tunable optical transceiver with optical intensity detection-based wavelength management

•We propose an optical intensity detection-based wavelength management method.•We propose a long-reach, bidirectional 40 Gb/s/λ, channel-reuse WDM-PON scheme.•100-km reach, bidirectional 40 Gb/s/λ transmissions is demonstrated.•Transmission performance is measured with different WSs and different OSRBNRs.

We experimentally demonstrate a channel-reuse, bidirectional 40 Gb/s/λ, long-reach wavelength-division-multiplexing passive optical network (WDM-PON) and an optical intensity detection-based wavelength management method for tunable optical transceiver used in colorless optical network unit. A 100 km reach, channel-reuse, 40 Gb/s/λ transmission on a 100 GHz WDM grid is achieved. Transmission performance is also measured with different optical-signal-to-Rayleigh-backscattering-noise ratios (OSRBNRs) and different central wavelength shifts (WSs) between upstream signal and downstream signal in the channel-reuse system. Optimal operating wavelength for the uplink optical signal and effective OSRBNR configurations taking into account AWG pass-band, wavelength instability of the bidirectional optical transmitters are proposed.