Order parameters for class-B lasers with a long time delayed feedback

A local dynamics for class-B laser systems with optoelectronic feedback is considered in the case of a very long time delay. We determine the conditions for the bifurcation of infinite dimension. It is shown that the (ordinary) delay system can be described by a systematically derived complex Ginzburg–Landau equation without delay terms. The complicated quasi-periodic dynamics near equilibrium can be demonstrated analytically on the basis of space–time representation.