Abstract: There is presented an apparatus for use with a Wavelength Division Multiplexed Passive Optical Network (WDM-PON). The apparatus comprises an electronic controller, optical transmitters and a wavelength multiplexer. The electronic controller is configured to receive first input electrical data signals, output electrical data signals on data channels based upon the input electrical data signals and change the data rate of at least a first of the output electrical data signals. The optical transmitters, which receive the electrical data signals, are each configured to receive, respectively on different data channels, electrical data signals output from the electronic controller. The optical transmitters output light signals corresponding to the received electrical data signals from the electronic controller. Respective light signals of each optical transmitter are centred on a different wavelength to the light signals of the other optical transmitters.

Abstract: There is provided a two-stage optical regenerator for regenerating a data signal comprising a series of optical pulses. Each stage of the optical regenerator comprises a modulator for modulating a reference signal with an input signal, and an interferometer for causing the modulated reference signal to interfere with another version of the modulated reference signal delayed by less than one bit period of the data signal to regenerate the input signal. The input signal of the modulator of the first stage of the regenerator comprises the data signal, and the input signal of the modulator of the second stage of the regenerator comprises the output from the first stage of the regenerator.

Abstract: There is provided a two-stage optical regenerator for regenerating a data signal comprising a series of optical pulses. Each stage of the optical regenerator comprises a modulator for modulating a reference signal with an input signal, and an interferometer for causing the modulated reference signal to interfere with another version of the modulated reference signal delayed by less than one bit period of the data signal to regenerate the input signal. The input signal of the modulator of the first stage of the regenerator comprises the data signal, and the input signal of the modulator of the second stage of the regenerator comprises the output from the first stage of the regenerator.