Assuming you mean xe-0/1/3, you can run show chassis hardware to confirm that the installed optic is recognized. If so you'll then want to check the cabling and its polarity as well as that of the end device connected to it.
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Assuming you mean xe-0/1/3, you can run show chassis hardware to confirm that the installed optic is recognized. If so you'll then want to check the cabling and its polarity as well as that of the end device connected to it.