TROUBLESHOOTING
sent into the detector will produce little or no output voltage.
Note also that if the fiber types are not compatible (single-mode
with multi-mode, and vice-versa), this can also be the cause of a
very low output voltage.
To clean the fiber:
1. Turn off the module.
2. Blow filtered air or another inert gas (such as nitrogen) into the
input fiber connector. This will help to remove any dust or dirt
particles that might be blocking the input light.
If more cleaning is needed, proceed with steps 3-8.
3. Wear a grounding strap.
4. Remove the two screws on the back panel with a Phillips
screwdriver. Remove the back panel.
5. Remove the two screws on the bottom of the detector using
an Allen key (1/16” or 1.5-mm), and carefully slide the detector
housing off.
Steps 6-8: Be extremely careful not to pull on the fiber. Stress
applied to the fiber where it attaches to the microwave hous-
ing can cause the fiber to misalign from the photodiode,
resulting in degraded detector performance.
6. Carefully disconnect the fiber connector from the fiber
receptacle attached to the front panel of the detector.
7. The front surface of the fiber can be cleaned using acetone
or alcohol and lens tissue.
8. Carefully reconnect the fiber to the front panel receptacle,
re-install the detector housing (be careful not to pinch or
damage the fiber), and re-install the back panel.
15
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