An optical network is a high-speed communication network, which makes use of light to transmit its data. The routing in optical networks also has an additional consideration for wavelength assignment. The presence of wavelength converters in an optical network elevates the wavelength - continuity constraint. But these devices are expensive to use and the need for full - conversion capability may not be entirely required. It is quite obvious that if we can determine the optimal value for the conversion degree for a given network, we shall be able to reduce the complexity and the cost of our network. The goal of this research is to determine the value of the conversion degree and determine the performance of the network when using this value in a network with sparse placement of wavelength converters (WC).