best all optical logic gate?

hi,i want to study some about all optical logic gate.i am familiar with SOA,MZI,Coupler some,
my question is best all optical logic gate design how much is their speed?
which structure in they is used?
please answer me they can compete with electronic design?yes or no why?
thanks in advance

this article reviewed all thing about all optical gate
https://www.hindawi.com/journals/aot/2014/275083/