Fiber optic light sources are a low-cost way to analyze and identify accurate fiber optic readings, while certifying optical fiber. Receive the ability to measure fiber optic light continuity, loss, and quality of the signal.


Light sources are an essential element of the fiber optic testing process. They’re used by technicians to stimulate the optical voice, video, and data signals of real-life service applications.


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To keep it simple, a light source – usually laser or LED – is used to initiate electromagnetic radiation to do things like detect faults, breaks, or micro-bends, characterize link-loss, and/or to certify LAN/WANs. Through a light source, needless to say, there’s a lot which can be deciphered about a fiber optic connection.

Flexible in use for short and long-term fiber optic testing needs, equip yourself with what you need to maximize uptime, minimize downtime, and keep a fiber optic network properly maintained and optimized. For simple, fast troubleshooting and verification needs, GAOTek fiber optic light sources are held up as among the best in the industry.

GAOTek has a full range of light sources for testing single-mode and multi-mode fiber networks. Available for sale in the United States, Canada, and globally, you’ll find our light sources serve several functions. Some of GAOTek’s light sources are multi-purpose instruments with numerous automated features, while others are uniquely optimized to perform specific testing such as for fiber loss and continuity.

GAOTek light sources are frequently used in combination with other fiber test equipment, including optical power meters and fiber identifiers. In-the-field testing of fiber optic cables have never been easier, thanks to GAOTek’s light sources. Complete with advanced technology, measurements are always highly precise and accurate. See high output and stability at a competitive price, with a high performance-to-cost ratio. For technicians in need of a versatile and compact measurement tool, check out GAOTek light sources.


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This Optical Light Source with Two Wavelengths provides modulated output in two wavelengths (1310 nm/1550 nm) for measuring the optical loss in a fiber cables.


This Light Source with High Stabilization comes with three wavelength output measurements from a single port with a built-in optic isolator which is useful for measuring insertion-loss on SM fibers.


This hand-held Laser Source with High Stability provides a stable laser signal in many wavelengths and ensures high stability of output power which is useful for testing fiber loss and continuity accurately.


This GAOTek Multi-Wavelength Optical Light Source is a portable device which provides a single button switch operation for the following multi-wavelength output options: 650 nm, 850 nm, 1300 nm, 1310 nm and 1550 nm.


This hand-held Multi-Wavelength Single Laser Light Source provides high stability multi-wavelength output from a single laser source and measures optical loss on both SM and MM fiber cables.


This Optical Light Source with Power Meter provides a modulated light which is used in determining the amount of loss in an optical fiber cable and comes with 1310 nm/1550 nm wavelength options.

ID: GAO-VLS-1072

This Handheld fiber optic light source is an easy-to-use optical light source which offers high accuracy and is used to test single and multi-mode optical fibers by using 1 to 4 output wavelengths.

ID: GAO-VLS-1082

This handheld adjustable light source offers quick and accurate testing and provides 1-4 output wavelength options for single and multi-mode fiber. It is designed for the installation and maintenance of optical fiber networks.

ID: GAO-VLS-1102

This high performance Laser Source supports stable laser signal on many kinds of wavelength, identifies fiber, tests fiber loss and continuity accurately, and aids in evaluatuating transmission quality of fiber chains.