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A new approach to electro‐optical signal modulation is proposed based on the geometrical representation of signal voltages. In the forward biased implementation an assembly consisting of a deposited meander pattern, sinusoidal mask, and microchannel plate (MCP) is shown to perform one‐dimensional Fourier analysis. The sinusoidal mask is shown to modulate a biasing voltage pulse as is traverses the meander pattern. In this paper the MCP gain and signal‐to‐noise models are combined with signal sampling criteria to obtain constraints on the assembly dimensions and biasing voltages. It is shown that a 0.5 mm square meander, coupled with mask wavelengths of order 10 mm, is sufficient to measure about 10 Fourier components of a 400 ps pulse with peak voltage of order 10 V. Experimental issues which have arisen in the course of testing the concept are discussed.