Optical transmission system comprising at least one optical fiber link and at least one optical line terminal, OLT, for transmitting signals in a downstream direction and receiving signals in an upstream direction via the least one optical fiber link, wherein said OLT comprises primary optical pumping means and secondary optical pumping means for providing optical pump power to said at least one optical fiber link, wherein said secondary optical pumping means comprise a pump light source that is configured to emit pump power at a wavelength which effects a second Raman gain characteristic of a Raman amplifier which is integrated within said optical fiber link, wherein the OLT comprises optical amplifying means (244; 264) for optically amplifying at least one signal received via said optical fiber link and/or optically amplifying at least one signal to be transmitted via said optical fiber link,wherein said optical amplifying means (244; 264) comprise a first amplifier which is configured to amplify DWDM downstream signals, wherein said first amplifier is an EDFA-type amplifier, wherein said first amplifier is configured to effect a first EDFA gain characteristic, wherein said first EDFA gain characteristic covers a second wavelength range, wherein said optical amplifying means (244; 264) are integrated into said OLT, and wherein said primary optical pumping means and said secondary optical pumping means are integrated into said OLT, and wherein - said primary optical pumping means comprise a pump light source that is configured to emit pump power at a wavelength which effects a first Raman gain characteristic of a Raman amplifier which is integrated within said optical fiber link, - said OLT comprises receiving means (202a; 202z) configured to receive dense wavelength division multiplexing, DWDM, signals from said optical fiber link in the upstream direction, - said OLT comprises transmitting means (202a; 202z) configured to transmit dense wave division multiplexing, DWDM, signals to said optical fiber link in the downstream direction, - said amplifying means (244; 264) comprise a second amplifier, which is configured to amplify DWDM upstream signals, wherein said second amplifier is an EDFA-type amplifier, - said first Raman gain characteristic covers a first wavelength range for the DWDM signals in the upstream direction, - said second Raman gain characteristic covers the second wavelength range for the DWDM downstream signals in the downstream direction, - said second amplifier is configured to effect a second EDFA gain characteristic, wherein said second EDFA gain characteristic covers the first wavelength range, - said first EDFA gain characteristic and said second Raman gain characteristic overlap in the second wavelength range to amplify the DWDM downstream signals in the downstream direction, - said second EDFA gain characteristic and said first Raman gain characteristic overlap in the first wavelength range to amplify the DWDM upstream signals in the upstream direction; and wherein the optical transmission system comprises a further network element (300; 400), which comprises no local optical pumping means. - said primary optical pumping means comprise a pump light source that is configured to emit pump power at a wavelength which effects a first Raman gain characteristic of a Raman amplifier which is integrated within said optical fiber link, - said OLT comprises receiving means (202a; 202z) configured to receive dense wavelength division multiplexing, DWDM, signals from said optical fiber link in the upstream direction, - said OLT comprises transmitting means (202a; 202z) configured to transmit dense wave division multiplexing, DWDM, signals to said optical fiber link in the downstream direction, - said amplifying means (244; 264) comprise a second amplifier, which is configured to amplify DWDM upstream signals, wherein said second amplifier is an EDFA-type amplifier, - said first Raman gain characteristic covers a first wavelength range for the DWDM signals in the upstream direction, - said second Raman gain characteristic covers the second wavelength range for the DWDM downstream signals in the downstream direction, - said second amplifier is configured to effect a second EDFA gain characteristic, wherein said second EDFA gain characteristic covers the first wavelength range, - said first EDFA gain characteristic and said second Raman gain characteristic overlap in the second wavelength range to amplify the DWDM downstream signals in the downstream direction, - said second EDFA gain characteristic and said first Raman gain characteristic overlap in the first wavelength range to amplify the DWDM upstream signals in the upstream direction; and wherein the optical transmission system comprises a further network element (300; 400), which comprises no local optical pumping means.