  A dynamic temperature compensation method is presented to stabilize the
wavelength of the entangled biphoton source, which is generated via the
spontaneous parametric down-conversion based on a MgO: PPLN waveguide.
Utilizing the dispersive Fourier transformation technique combined with a
digital proportional-integral-differential algorithm, the small amount of
wavelength variation can be instantly identified and then compensated with
active temperature correction. The long-term wavelength stability, assessed
though Allan deviation, shows nearly a hundredfold enhancement, reaching
2.00*10^(-7) at the averaging time of 10000 s. It offers a simple, ready-to-use
solution for precise wavelength control in quantum information processing.
