A wavelength division multiplexed, WDM, passive optical networks, PON, WDM PON comprising: an optical line transmitter, OLT, coupled to a plurality of optical network units, ONU, (110a, 110b) using an optical fibre network, the OLT having one or more WDM transceivers (115a, 115b) each arranged to transmit a received multi-cast or point-to-point channels and a multiplexer configured to multiplex together a respective dedicated wavelength (λa, λb) from each of the one or more WDM transceivers (115a, 115b), wherein each WDM transceiver (115a, 115b) is arranged to transmit said multi-cast or point-to-point channel to a respective ONU (110a, 110b) using the respective dedicated wavelength (λa, λb); the OLT further comprising one or more input channel switches (130a, 130b) each associated with a respective WDM transceiver (115a, 115b) and arranged to selectively couple the input of the respective WDM transceiver to the multi-cast channels or to the point-to-point channels, wherein the one or more input channel switches (130a, 130b) are layer 1 switches; wherein each of the input channel switch (130a, 130b) is arranged to select between the multi-cast or the point-to-point channels in response to a control signal (150a, 150b) from the respective ONU (1 10a, 110b) corresponding to the respective WDM transceiver (115a, 115b); and wherein said multi-cast or point-to-point channel is transmitted over the fibre network to a remote node comprising a demultiplexer, wherein the demultiplexer separates the respective dedicated wavelengths (λa, λb) onto respective fibre links to the respective ONU (110a, 110b), and wherein the selected multi-cast or point-to-point channels are directly converted to the respective dedicated wavelength. an optical line transmitter, OLT, coupled to a plurality of optical network units, ONU, (110a, 110b) using an optical fibre network, the OLT having one or more WDM transceivers (115a, 115b) each arranged to transmit a received multi-cast or point-to-point channels and a multiplexer configured to multiplex together a respective dedicated wavelength (λa, λb) from each of the one or more WDM transceivers (115a, 115b), wherein each WDM transceiver (115a, 115b) is arranged to transmit said multi-cast or point-to-point channel to a respective ONU (110a, 110b) using the respective dedicated wavelength (λa, λb); the OLT further comprising one or more input channel switches (130a, 130b) each associated with a respective WDM transceiver (115a, 115b) and arranged to selectively couple the input of the respective WDM transceiver to the multi-cast channels or to the point-to-point channels, wherein the one or more input channel switches (130a, 130b) are layer 1 switches; wherein each of the input channel switch (130a, 130b) is arranged to select between the multi-cast or the point-to-point channels in response to a control signal (150a, 150b) from the respective ONU (1 10a, 110b) corresponding to the respective WDM transceiver (115a, 115b); and wherein said multi-cast or point-to-point channel is transmitted over the fibre network to a remote node comprising a demultiplexer, wherein the demultiplexer separates the respective dedicated wavelengths (λa, λb) onto respective fibre links to the respective ONU (110a, 110b), and wherein the selected multi-cast or point-to-point channels are directly converted to the respective dedicated wavelength.