Wavelength dilation is a technique sometimes used in optical switching systems wherein the number of wavelengths available inside the switching fabric is larger than the number of wavelengths transported on the inputs to the switch. This is similar to time dilation in TDM switches where the speed of the fabric is higher than the speed of the input ports. The aim of both types of switch dilation is to reduce contention inside the switching fabric.
M. MacGregor, M. MacGregor,
"Wavelength dilation networks", Proc. SPIE 10313, Opto-Canada: SPIE Regional Meeting on Optoelectronics, Photonics, and Imaging, 103131T (29 August 2017); doi: 10.1117/12.2283861; https://doi.org/10.1117/12.2283861