I'd like to write this sentence:
In both excitation and emission beam path a Mach-Zehnder interferometer is introduced, both of which exhibiting equal delays.
I don't like the style of the sentence, because I use two times 'both'. I am not even sure it is grammatically correct, as the subordinate clause refers to two interferometers, although I put the 'interferometer' in singular. I was playing around with some other structures, but I wasn't satisfied. Does anybody have any suggestions how to transform the sentence to proper English?
Thanks a lot!