All-optical method of developing parity generator and checker with polarization encoded light signal

The use of optical signal in logic and data processing is not new. Lots of optical systems are already implemented using light as the data signal. In this context polarization based encoding of data is an important method. Again to avoid any unwanted error in data signal sometimes it becomes essential to check the data signal, especially during transmission of data through large distance. Checking the parity of the data signal during transmission and reception is one way to ensure errorless transmission of data. In this communication the authors propose a method to implement an all-optical parity generator and checker using polarization encoded light signal. The scheme uses the switching capacity of isotropic nonlinear material, where the 1st order nonlinearity is absent but the 2nd order nonlinearity is present. This scheme can be used to check whether any error has occurred during transmission of optical data signal. As parity checking is an essential component in any communication system and it ensures the correctness of sending data at the receiving point, so the proposed all- optical system can exhibit a strong application in optical communication as well as in computation.