How to measure the signal strength of a fiber optic patch cord
Signal strength of a fiber optic patch cord is typically measured using insertion loss (IL) and return loss (RL) tests with specialized equipment like OLTS or OTDR.
Key Methods for Measuring Signal Strength
1. Insertion Loss (IL) Testing Insertion loss measures the amount of optical power lost when a patch cord is inserted into a network. A lower IL indicates better signal transmission. To measure IL:
- Use an Optical Loss Test Set (OLTS), which includes a light source and a power meter.
- Connect the light source to one end of the patch cord and the power meter to the other.
- Record the power difference between the input and output; this is the IL in dB.
- According to TIA standards, acceptable IL for high-quality connectors is typically below 0.75 dB, with top-quality patch cords often achieving 0.3–0.5 dB . 2. Return Loss (RL) Testing Return loss measures the amount of light reflected back toward the source due to discontinuities or imperfections in the fiber. Higher RL values indicate better performance. RL is measured using the same OLTS or specialized RL meters, and it ensures minimal signal reflection that could degrade network performance . 3. Optical Time-Domain Reflectometer (OTDR) An OTDR sends pulses of light through the fiber and measures backscattered light to detect faults, bends, or splice losses. While OTDR is more commonly used for longer fiber links, it can also verify patch cord integrity and detect localized losses . 4. Endface Inspection and 3D Metrology Signal strength can be affected by connector endface quality. Use a fiber inspection microscope or 3D interferometer to check for scratches, pits, contamination, or improper polishing. Proper endface geometry ensures minimal IL and RL . 5. Polarity Verification For multi-fiber patch cords, ensure the transmit (Tx) and receive (Rx) channels are correctly aligned. Misalignment can reduce effective signal strength even if IL and RL are within specifications .
Recommended Testing Sequence
- Pre-polish inspection of connectors.
- Polishing and cleaning of endfaces.
- 3D endface metrology to verify geometry.
- IL and RL measurement using OLTS.
- Optional OTDR testing for fault detection.
- Polarity check for multi-fiber assemblies. Following this sequence ensures accurate measurement of signal strength and overall patch cord performance, helping maintain network reliability and compliance with industry standards .
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