Optical line terminal and optical fiber access system with increased capacity

An optical line terminal for a passive optical network, comprising

• at least one transmitter at the optical line terminal of the passive optical network, the transmitter configured to generate a time division multiplexed (TDM) downstream optical data signal comprising a number of channels that are separated in time t with separation Δt,
• a first time lens optical signal processor at the optical line terminal, the first time lens optical signal processor comprising two phase modulation stages with chirp rate K=1/D separated by a dispersive medium with dispersion D=β2L in a K-D-K configuration, wherein β2 is the 2nd order dispersion and L is the length of the dispersive medium, such that the first time lens optical signal processor is configured to convert the downstream TDM optical data signal to a downstream wavelength division multiplexed (WDM) optical data signal by means of optical Fourier transformation such that the temporal profile of the downstream TDM optical data signal is transferred into the frequency domain of the downstream WDM optical data signal, said downstream WDM optical data signal for distribution to a plurality of users via passive demultiplexing in the passive optical network, wherein a scaling factor between the downstream TDM optical data signal in the time domain and the downstream WDM optical data signal in the frequency domain is determined by the chirp rate K of the phase modulation stages according to Δt=2πΔf/K such that the downstream WDM optical data signal, converted by the first time lens optical signal processor, comprises at least the same number of channels as the downstream TDM optical data signal, but the channels of the downstream WDM optical data signal are separated in frequency f with separation Δf=Δt·K/2π, and
• at least one receiver at the optical line terminal for receiving and processing an upstream signal from said users, said upstream signal distributed over the passive optical network.