An optical power meter with an FC connector measures the optical signal strength in fiber optic cables, providing readings in dBm or mW for both single-mode and multimode fibers.

Overview of Measurement

An optical power meter (OPM) is used to measure the absolute optical power or relative power loss in fiber optic networks. When using an FC connector, the meter connects directly to the fiber, ensuring accurate alignment and minimal signal loss. FC connectors are commonly used in single-mode fiber networks due to their threaded design, which provides stable and repeatable connections .

Key Features

• Measurement Range: Typical OPMs measure from +10 dBm to -70 dBm, covering most field applications .
• Wavelength Support: Many meters support multiple wavelengths, e.g., 850 nm, 1310 nm, 1490 nm, 1550 nm, up to 1700 nm, allowing testing of both single-mode (SM) and multimode (MM) fibers .
• Units: Readings are displayed in dBm (logarithmic) or mW (linear), with some meters providing both simultaneously .
• Relative Power Measurement: OPMs can compare the measured power to a reference level to calculate insertion loss or fiber attenuation .

Measurement Procedure

1. Connect the FC Adapter: Attach the FC connector from the fiber under test to the OPM's FC port.
2. Select Wavelength: Set the meter to the wavelength of the optical source or the network signal.
3. Zero/Reference Calibration: If measuring relative power, set a reference level using a known source.
4. Read Power: The meter displays the optical power in dBm or mW. For insertion loss, subtract the measured power from the reference power.
5. Record Data: Many meters allow memory storage for multiple readings, useful for network documentation .

Applications

• FTTH/FTTx Testing: Ensures proper signal levels in fiber-to-the-home or fiber-to-the-building deployments .
• Network Maintenance: Detects fiber degradation or connector issues.
• Certification and Troubleshooting: Confirms compliance with optical power specifications and identifies losses in splices or connectors .

Recommended Devices

• GAOTek Optical Power Meter: Supports FC, SC, ST connectors, multiple wavelengths, and both SM/MM fibers .
• Jonard Fiber Optic Power Meter: Measures absolute and relative power with FC adapters, range +10 to -70 dBm .
• 567XL TEMPO: Silicon diode-based meter for 635, 780, 850 nm, with FC snap-on connectors and reference storage . Using an FC-compatible optical power meter ensures precise, repeatable measurements, critical for maintaining high-performance fiber optic networks.