A Comprehensive Guide to Properly Testing the Insertion Loss of Fiber Optic Patch Cords

Introduction

Fibre optic patch cords, also known as fibre jumpers or fibre patch cables, are one of the most common components in fibre optic networks. They play a vital role in transmitting data from one device to another, which makes their performance crucial to the overall efficiency of the system. One of the key performance indicators of a fibre optic patch cord is its insertion loss.

Insertion loss refers to the reduction in power density (signal) that occurs when a signal is transmitted through the patch cord. It is measured in decibels (dB), and a lower value indicates a better performance. Therefore, it is essential to test the insertion loss of fibre optic patch cords to ensure optimal network performance. This article will guide you through the process of testing the insertion loss properly.

Equipment Needed

Before starting the testing process, you’ll need to gather the following equipment:

1. Light source: This can be a laser diode or LED source, depending on the type of fibre optic patch cord you’re testing.
2. Power meter: This is used to measure the power of the light signal before and after it passes through the fibre optic patch cord.
3. Reference cables: These are known-good fibre optic cables used to calibrate the testing equipment.
4. Fibre optic patch cord: The cable you’re testing.
5. Cleaning supplies: Fibre optic cleaning solution and lint-free cleaning wipes.

Step-by-Step Guide to Test Insertion Loss

Step 1: Prepare the Equipment

First, you need to ensure that your testing equipment is in good working condition. Clean the connectors of your light source, power meter, and reference cables using the cleaning solution and wipes. This is important because dust and dirt can interfere with the light signal and affect your readings.

Step 2: Set the Reference Power Level

Connect your light source to your power meter using one of the reference cables. Turn on the light source and let it warm up for a few minutes. Then, measure the power level using the power meter. This is your reference power level.

Step 3: Measure the Insertion Loss

Disconnect the reference cable from the power meter and connect the fibre optic patch cord you’re testing. Make sure the other end of the patch cord is connected to the light source. Measure the power level again. The difference between this reading and the reference power level is the insertion loss of the fibre optic patch cord.

Step 4: Repeat the Test

To ensure accuracy, repeat the test several times and take the average of the readings. Additionally, you should test both ends of the fibre optic patch cord as the insertion loss may differ.

Conclusion

Testing the insertion loss of fibre optic patch cords is a critical step in maintaining the performance of your fibre optic network. By following this guide, you can ensure that your patch cords are functioning optimally and contributing to the overall efficiency of your system. Remember, a lower insertion loss means better performance, so aim for the lowest possible reading in your tests.