ASE light source today with low loss systems have nearly unlimited bandwidth, and offer distinct advantages over other previously created transmission media. The fundamental optical transmitters convert electricity to modified light to be transmitted through the optical fiber. The most popular devices used to provide light sources in optical transmitters is a diodes that emit light. Fiber optic light sources can make great use of this because light emitting diodes have significant emitting regions and can be utilized for medium distances. Light sources made of fiber optics are economical.

An optical light source is mounted on a device that allows optical fibers to bring the maximum amount of light to the fiber. In certain cases, a tiny lens spherical is also used to capture and focus every possible light beam onto the fiber. LED's i.e. light emitting diodes or light diodes work in the an infrared spectrum of electromagnetic spectrum. The wavelengths they operate at are selected depending on the requirement. The fiber optic light source is trustworthy and the main wavelengths utilized by fiber optic light sources are 850 - 1300 nanometers and in some cases , even 1500 nanometers. As for LD's, both LED's (light diodes) are available in three different wavelengths.

There are two ways through which light can be incorporated to the fiber optical light source. The first is by pig-tailing. the other method is to place the fiber's tips in the vicinity of an LED. Since the only medium used in these systems is light there is no chance of electrical shock for the people who are repairing damaged fibers.

The primary function of a optical fiber light sources is allow light pulses to travel through fiber and work according to the concept of internal reflection total which means that when an angle of incident is higher than the critical point, light will not leave the glass, instead it bounces back. Fiber optic lights functions according to this principle, as it allows the transmission of information along fiber lines in the form light pulses.

There are numerous types of light sources that function as an optical light source. Fiber optic lights typically is enclosed in a tough splashproof enclosure and comes with one switch for operation. The fiber optic source comes with an integrated source that can show that the battery is full or not. One battery in a fiber-optic light source provides more than 40 hours of power in the event of a stable temperature compensated LEDs that have 850 nm or 1300 nm fiber optical light source. They can provide 40 dB of measurement range when used in conjunction with fiber OWL as well as Micro OWL. There are laser models that are available in this category.