How to Test Fiber optic Cable?

How to Test Fiber optic Cable?

Fiber optic networks are an essential aspect of the construction and continuing maintenance of the fiber optic system. Following core fiber testing best practices, fiber deployments and network activation will become safer, more efficient, and more confident.

Best Practices Fiber Optic Cable Testing

The necessity of cleanliness cannot be exaggerated in fiber installation and testing. The fiber optics microscope can be used to check the core’s cleanliness and connect ferrule as a fiber optic testing device. For standard fiber connections such as PON and MPO, automatic inspection tools can be employed. For the proper cleaning of fiber optic cables, specialized cleaning products are recommended. The same attention should also be paid to cleanliness for reference cables and connections to test equipment.

When employing a fault location VFL (Visual Fault Locator) fiber testing device, eye security is crucial. Because a VFL uses a high-intensity laser light source, it is unnecessary to examine either the head of the fiber core illuminated by the VFL directly with the naked eye.

The use of an optical light source and power meter or a fiber test set (OLTS) for confirming that optical power budgets are in line with the design parameters is considered a suitable fiber testing procedure. In combination with an Optical Power Meter (OPM), a calibrated optical light source (OLS) can assess the connection’s insertion loss before turning.

An OTDR is the suggested fiber optic tool for baseline and complete recording of the “characteristics” of the fiber link.

An OTDR is intended to detect, locate and quantify events everywhere on a fiber network. Information is generated on locations for localized losses and reflective events to give technicians an image and permanent record of fiber characteristics.

Use launch cables to certify the front-end and far-end connectors when utilizing an OTDR. A starter cable is linked to the test fiber between a test tester, and the receiving cable is attached at the far end of the fiber connection. The yarn used in the launch and receipt of wires should match the test fiber (type, core size, etc.)

Test process automation (TPA) principles effective on the manufacturing floor can also be extended to installing the fiber network. Certification and processing may be accomplished with confidence and predictability by lowering manual testing and reducing mistake opportunities and training times.

Finally, good planning and preparation are basic best practices for any organized effort, including fiber testing. For the most successful and precise fiber-optic tests, it is vital to assemble and manage a pre-cleaned, measured, and complete testing tool kit.

Fiber testing and construction of fiber optic cables

In its simplicity, the application of fiber optic communication can seem elegant. Yet, fiber optic cable testing demands a clear understanding of several basic principles that distinguish fiber testing from its analog wire testing precursor.

The optical fiber consists of a skinny glass rod surrounded by protection against plastics. Due to the total inner reflection of light between the core and the cladding, light injected into the glass fiber’s heart will follow that fiber’s physical path.

Testing of fiber

In fiber testing, the fundamental constituents of an optical fiber frequently refer to as the “three c’s”:

Core: The center of the fiber cable is composed of glass or plastic adequately treated. This is the light transmission medium throughout the line, so that it needs to be as clean and clear as feasible.

Cladding: a further layer of material, identical to the core but with a lower refractive index, enables the light source to be continually reflected into the body.

Coating: external cable coating that covers, shields, and insulates the core and reinforcement.

Fiber types are categorized into many types (multimode or single-mode) based on how light passes through them. The type of fiber is directly linked to the core diameter and the cladding. Multimode fiber has a wider core diameter that permits several light modes to travel through it simultaneously.


The main advantages of multimode fiber are easy connection with light sources and other threads, cheaper light sources (transmitters), and easier joining and splicing processes. Its significant attenuation (optical lowering) and limited bandwidth, however, limit light transmission to small distances using multimode fiber.

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