Crosstalk reduction in multiplexers/demultiplexers by correction of optical paths of waveguide arrays

The issues of development of waveguide optical systems of multiplexing/demultiplexing based on waveguide phased arrays are considered with the aim of increasing the number of channels of fiberoptics communication lines and creation of systems with dense and superdense channel multiplexing. The factors that limit the increase in the channel number are determined. The role of the phase and amplitude errors resulting from the fluctuations of parameters of waveguide matrices in the course of their manufacture is demonstrated. Ways of solving the problem of reducing the phase errors by correcting the optical path of the array elements are considered. An analytical survey of correction methods based on various physical effects is carried out.