It has been found that, if a dispersion-free primary wave packet being identical with a material particle in the four-dimensional space is introduced, then the Fourier central component of the primary wave packet has a factor which is the de Broglie wave function. Thus it is infered that the electromagnetic wave is related to the Fourier central component of the photon as a primary wave packet. A light pulse like the Schrodinger wave packet is a secondary wave packet which may be even infinitely short in time, even infinitely small in space and may contain even infinitely small average number of photons.
Wang Guowen, Wang Guowen,
"Ultrashort Light Pulse And The Concept Of The Photon", Proc. SPIE 1032, 18th Intl Congress on High Speed Photography and Photonics, (7 June 1989); doi: 10.1117/12.969139; https://doi.org/10.1117/12.969139