What do you want to monitor ?
If you want to monitor signal strength and such or do you want to monitor that noone connects to the optical link itself and taps out information, or do you want to monitor traffic flows inside of the link.
or do you want to monitor the cable itself with "special" testequipment.
The First and Third options you can get some stuff out of the switch.
The Second uption there are depending on what type of cabeling and wat speed you are in. Do you want to encrypt the information traveling the links ? if so this can be quite expensive.
The fourth one there are some fiber optics test equipment that tells you of cable faults and types and such.
Those range from about 100$ to 10 000$
good luck
