HI DHANANJAY PATEL,
IF IT WORKS FINE PLEASE SHARE YOU .OSD FILE OR ITS SCREEN SHOT,
for practical perspective there is nothing like delay elememt…but for delay have to be introduced for simulation purposes of bidirectional fibers.
here is link of document you need to set for bidirectional fibers.
https://dru5cjyjifvrg.cloudfront.net/wp-content/uploads/2016/02/OptiSystem_Introductory_Tutorials2.pdf?683531
visit chapter5 of this document
with regards