hi ankita sharma,,,
i think i got your problem .
you might be facing the problem of using optiacal delay component, as no signal is shown in the uplink after delay component..
you need to add few sweep iterations and simulate your .osdfile…
then check any visvalizer (optical spectrum analyzer)after the delay component in the uplink… there is the provision to change the signal index in visualizer…
change the index you will get the signal
with regards