Dynamic pump-wavelength selection for optical packet switch with recursive parametric wavelength conversion

This paper proposes a scheme for pump wavelengths selection in an optical packet switch (OPS) with parametric wavelength converters (PWCs), where the pump wavelengths are dynamically changed for all time slots and more than one PWC are allowed to convert a wavelength in a recursive manner. This scheme is called a dynamic pump-wavelength selection with recursive parametric wavelength conversion (DPS-R). A PWC, which has an advantage of multiple wavelength conversion, uses a pump wavelength that can be flexibly chosen to define which wavelengths can be converted from/to, called wavelength conversion pairs. The OPS allows each wavelength to be converted using combination of available conversion pairs from more than one PWC. A conventional scheme, pump wavelengths are statically preassigned, so that the conversion pairs are fixed for all time slots. Requests may remain since the pump wavelengths are not able to be reconfigured. The available conversion pairs may not support those requests. DPS-R is used to select the pump wavelength for each PWC to maximize the number of wavelength conversion pairs supported, in both recursive and non-recursive manners. Numerical results via simulation show that DPS-R outperforms the conventional scheme in term of packet loss rate.