hi,damian,i’m sorry to reply you late.I will explain what the exact delay want.I want to use a optical switch to control my signal.if the signal have not came to the switch,i will turn off my switch,and if the signal is coming,i wll turn on my switch to pass my signal.however,in optisystem,the signal seems to come to the optical switch simultaneously.so i want to my signal delay some time to being controled by my switch.thanyou!THE PROJECT IS ATTACHED.