Abstract:
An optical system comprises an optical apparatus arranged to direct received light to different paths and to provide a first signal and a second signal, said first and second signals having an optical difference therebetween sufficient for distinguishing optical signals, an amplifier in optical communication with the optical apparatus for amplifying the first and second signals, and a discrimination device to receive amplified light and to provide output light responsive to the optical difference.
Abstract:
A pulse conditioning apparatus can comprise a signal splitter for splitting a pulsed input signal into first and second pulsed signals; a spectrally dispersive element configured for subjecting the first pulsed signal to a spectral dispersion for compressing or stretching the first pulsed signal, the first and second pulsed signals being subjected to substantially different spectral dispersion; and a combiner for combining the first and second pulsed signals to an output pulsed signal, the output pulsed signal output comprising pulses having a surge pulse portion and a base pulse portion, at least one of the portions derived at least in part from the spectral dispersion and attendant compression or stretching of the first pulsed signal.