An optical signal processor employing an optical threshold device for reducing wideband optical noise and a method therefor

摘要

An optical signal processor for use with an optical input signal dispersed over a spectrum of frequencies containing wideband optical noise is disclosed. The processor comprises a first prism for translating the spectrum of optical input signals into the spatial domain, an optical threshold device for transmitting optical signals whose combined intensities exceed a threshold level which is greater than the level of the noise, and a second prism for translating the optical signals from the spatial domain to the frequency domain, such that the optical output signals correspond to the optical input signals with the noise below the threshold level removed. A method for removing wideband optical noise is also disclosed. Alternatively, optical signal translators in the form of an arrayed waveguide or a grating may be employed.