It is indeed a very hot topic in optical sciences.
I forgot to attach some links in my previous reply,so i am attaching some links for your reference which might be useful to you.
https://optiwave.com/wp-content/uploads/2015/10/Implementation_of_All-Optical_Logic_Gate.pdf?51da48
https://www.google.co.in/url?sa=t&rct=j&q=&esrc=s&source=web&cd=6&cad=rja&uact=8&ved=0ahUKEwjhlOG476bLAhXJHY4KHV2zCSkQFgg3MAU&url=http%3A%2F%2Fwww.ijltet.org%2Fwp-content%2Fuploads%2F2015%2F01%2F22.pdf&usg=AFQjCNHHaPBBlpDusKo0QhX_bH6Xat4N2g&sig2=_F2A0yugq4h6yXDmGJ9R2A
https://www.google.co.in/url?sa=t&rct=j&q=&esrc=s&source=web&cd=8&cad=rja&uact=8&ved=0ahUKEwjhlOG476bLAhXJHY4KHV2zCSkQFghBMAc&url=http%3A%2F%2Fijiset.com%2Fvol2%2Fv2s2%2FIJISET_V2_I2_53.pdf&usg=AFQjCNEESDQWhvw-tUpLO7B-4UTWJjqxEA&sig2=MQ8iPqXKGVQs70g4I2sKGw