QCGL: localized dissipative solitons — stable pulses from gain/loss balance
QCGL: ∂A/∂t = δA + (1+iβ)∂²A/∂x² + (ε+i)|A|²A + (μ+iν)|A|⁴A. Dissipative solitons exist as fixed points in function space — gain/loss balance at specific amplitude. Used in fiber lasers, pattern formation.