Optical interface units are provided for transmitting data and video signals in a deep fiber network. The optical interface units may include a first type which is situated in a central location, such as at a host digital terminal in a central office location, and a second type which is situated near a subscriber location, such as at an optical network unit. The first type of optical interface unit combines downstream video signals at a first wavelength with downstream data signals at a second wavelength and also receives upstream data signals at the second wavelength. The second type of optical interface unit receives the transmissions from the first type of optical interface unit at the first wavelength and transmits the upstream data signals at the second wavelength. Various embodiments of the optical interface units are provided for extending the functionality of the network to provide high speed data and video on demand services.