A light source is required when an optical power meter is used to measure optical loss or end-to-end fiber performance, but not for measuring absolute optical power alone.
An optical power meter (OPM) can measure the absolute power of a light beam directly using its sensor, which may be a photodiode, thermopile, or pyroelectric detector . In this case, the meter detects the incoming light and converts it into a measurable electrical signal, displaying the power in units such as milliwatts or dBm . No additional light source is needed if the goal is simply to measure the power of an existing light signal.
When the objective is to measure optical loss in a fiber optic link, a light source is required. The light source, often a laser or LED, emits light at a known wavelength and power level into the fiber. The optical power meter is then placed at the other end of the fiber to measure the received power. By comparing the transmitted and received power, the end-to-end loss of the fiber can be calculated . This setup is commonly referred to as an Optical Loss Test Set (OLTS), which combines a stabilized light source with a power meter for accurate loss measurements .
For accurate measurements, the optical power meter must be set to the same wavelength as the light source, because the meter's response is wavelength-dependent . Using a mismatched wavelength or spurious light can result in incorrect readings. Some advanced OLTS systems may include multiple meters or sources to measure additional parameters like Optical Return Loss.
In conclusion, whether a light source is required depends on the measurement purpose: for absolute power, it is optional; for loss or fiber characterization, it is essential .
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