What does OPM-B mean in an optical power meter

OPM-B refers to a Type-B optical power meter, designed to measure moderate optical power levels in fiber optic systems.

Definition and Classification

An OPM-B is a specific classification of optical power meter, often referred to as a Type-B power meter. According to technical standards, Type-B meters are intended to measure optical power levels greater than or equal to +3 dBm, making them suitable for testing the output of active optical devices and measuring insertion loss or attenuation in optical links . This contrasts with Type-A meters, which are designed for high optical power measurements (≥ +28 dBm) .

Typical Specifications

For example, the OPM-B from Beijing Rofea Optoelectronics has the following characteristics :

• Power Measurement Range: -90 dBm to +16 dBm
• Wavelength Range: 300 nm to 1100 nm
• Calibrated Wavelengths: 780 nm to 850 nm These specifications make OPM-B meters suitable for fiber optic installation, maintenance, and testing, including measuring optical power in single-mode and multimode fibers.

Applications

OPM-B meters are commonly used to:

• Measure the output power of active optical devices such as lasers or LEDs
• Evaluate insertion loss or attenuation in passive optical components and fiber links
• Test Passive Optical Networks (PONs) for FTTH applications at standard wavelengths (1310 nm, 1490 nm, 1550 nm)
• Perform routine installation and maintenance checks in optical communication networks

How It Works

Like other optical power meters, an OPM-B uses a photodiode sensor to convert incoming light into an electrical signal, which is then displayed in dBm or watts. The meter is calibrated for specific wavelengths to ensure accurate readings, and the user must select the correct wavelength corresponding to the fiber system being tested .

Summary

In short, OPM-B identifies a Type-B optical power meter optimized for moderate power measurements in fiber optic systems. It is widely used in telecommunications, data centers, and FTTH networks to ensure proper optical signal levels and link performance. Its classification distinguishes it from Type-A meters, which handle higher power levels.