What is the Chopped Light Mode?
- To increase measurement level sensitivity by cutting the high frequency noise
- To detect only the light that the LS emitted, effective for free space measurement. In free space measurement, the detector can also receive ambient light, e.g. sunlight and ceiling light. If the LS emits chopped light, then the OPM measures only the chopped signal at the same frequency
- To remove power measurement error due to the drift of the electrical amplifier's offset, effective for long term measurement. Since the amplifier's offset is temperature dependent, AC detection (CHOP mode) is ideal for long term measurement
- In field testing, chopped light is commonly used for fiber identification
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