Just in case if you want to simulate a fiber cut, you can enter a command from the FPC shell that cuts the power to the laser of an interface.
start shell pfe network fpcX
test xfp <index> laser off
You can find the XFP index by doing "show xfp list" from the shell prompt. Not sure if there is any another method that works for SFP interfaces.
For sonet interfaces, this hidden configuration is also an option:
set interfaces so-x/y/z sonet-options insert-los
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