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You can see optical powers on the kcu1500 with the pykcu command (and pvget), although see below for examples of problems so I have the impression this isn't reliable.  See the timing-system section for an example of how to do thisrun pykcu.  On the hsd's themselves it's not possible because the FPGA (on the hsd pcie carrier card) doesn't have access to the i2c bus (on the data card).  Matt says that In principle the hsd card can see the optical power from the timing system, but that may require firmware changes.

Note: on the kcu1500 running "pykcu -d /dev/datadev_1 -P DAQ:CPO" this problem happens when I unplug the fiber farthest from the mini-usb connector:

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