Today’s optical networks are carrying enormous traffic which is doubling almost every year. The traffic includes voice, data, video and various real time application services like remote monitoring and control, remote surgery etc.The All Optical Network utilizes the low delay in optical fibers by keeping the signal in the optical domain from source to destination. When WDM is used in the AON we obtain the wavelength routed optical network (WRON).WRONs transmit signals entirely in the optical domain, reducing delay, but imposing a new restriction, the wavelength continuity constraint Wavelength conversion has been shown as one of the key techniques that can improve the blocking performance so the success probability in a wavelength-routed all-optical network. Also the wavelength converters are very expensive so to make effective use of the limited number of wavelength converters different techniques are used.It has been observed that wavelength conversion can decrease the blocking probability by a large margin. The p-cycle concept is a recent strategy to recover from network failures.