The embodiment of the invention provides an optical correlator based on
modal dispersion, and belongs to the field of
optical fiber communication. The optical correlator based on
modal dispersion is characterized in that a
light source (1) is located at the
focal position of a convergent lens (2), the back of the convergent lens (2) is a light input port (4a) of a
spatial light modulator (4), an electric input port (4b) of the
spatial light modulator (4) is connected with a
signal source (3), the back of a light output port (4c) of the
spatial light modulator is a convergent lens (5), the
focal position of the convergent lens is the input end of a multi-mode
optical fiber (6), and the output end of the multi-mode
optical fiber (6) is connected with a photoelectric
detector (7). The optical correlator based on
modal dispersion is basically characterized in that the
modal dispersion of the multi-mode optical
fiber is used for manufacturing the correlator and has the
advantage of being simple in structure, and the optical
fiber is short, so that the
energy loss in the transmission process of light signals is reduced. The
light source bears the signals to be detected, the use of a high-speed modulator is avoided, and
system cost is avoided. The use of the multi-mode
light source overcomes the defect that an existing optical correlator based on
modal dispersion has a high requirement for the bandwidth of the light source, and the optical correlator based on
modal dispersion has broad application prospects on the aspect of
light signal processing.