Optical power meters OLS and OPM

An Optical Light Source (OLS) generates a controlled light signal, while an Optical Power Meter (OPM) measures the power of that light, and together they are used to test fiber optic links.Optical Power Meter (OPM)An Optical Power Meter is a device designed to measure the power of an optical signal, typically in fiber optic systems. It consists of a calibrated photodiode sensor, a measuring amplifier, and a display that shows the optical power in units such as watts or decibel-milliwatts (dBm) . OPMs can be handheld or bench instruments and are often combined with other tools like Visual Fault Locators (VFL) or Optical Light Sources (OLS) . Modern OPMs, such as AFL's OPM5, can store reference measurements, support multiple wavelengths simultaneously, and transfer results to PC software for analysis and reporting .Optical Light Source (OLS)An Optical Light Source is a device that emits a stable, known optical signal at a specific wavelength into a fiber. It is used to provide a reference signal for testing fiber links. The OLS ensures that the light injected into the fiber has minimal insertion loss and is suitable for accurate measurement at the far end . Common wavelengths for testing include 850 nm, 1310 nm, and 1550 nm for single-mode and multimode fibers.Combined Use: Optical Loss Test Set (OLTS)When combined, an OLS and OPM form an Optical Loss Test Set (OLTS), which measures the optical loss or attenuation of a fiber link. The OLS injects light into the fiber, and the OPM measures the received power at the far end. The attenuation is calculated as the difference between the known transmitted power and the measured received power . This method is critical for verifying fiber installation quality and ensuring compliance with industry standards.Key Features and Practical ConsiderationsWaveID Functionality: Some OPMs can detect multiple wavelengths simultaneously, reducing test time and errors when paired with compatible OLS devices .Calibration: OPMs are calibrated using traceable standards to ensure accurate measurements across different wavelengths .Portability and Durability: Field OPMs are designed to withstand drops, have splash-resistant controls, and use long-lasting batteries for outdoor testing .Data Management: Modern OPMs can store test results, generate Pass/Fail reports, and interface with software for documentation . In summary, OLS provides the light signal, OPM measures it, and together they allow technicians to assess fiber optic link quality accurately, making them essential tools in telecommunications, FTTH deployments, and optical network maintenance.