Providing A Fiber Optic Light Source
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Providing a Fiber Optic Light Source
Overview
Low-loss fiber optic systems today offer almost unlimited bandwidth and unique advantages over previous transmission media. At the heart of these systems, optical transmitters convert electrical signals into modulated light, sent through optical fibers. Light-emitting diodes (LEDs) are commonly used as the light source due to their larger emitting areas and suitability for moderate distances, making fiber optic light sources both efficient and economical.
How Fiber Optic Light Sources Work
Fiber optic light source devices are designed to maximize light coupling into the fiber. They might include a tiny spherical lens to focus the light efficiently. LEDs and laser diodes (LDs) typically operate in the infrared spectrum, with wavelengths ranging from 850 to 1500 nanometers, making them reliable choices for fiber optic applications.
Light Coupling Methods
There are two primary methods for coupling light into a fiber optic light source: pig-tailing and positioning the fiber tip near an LED or LD. Since these systems use light as the only carrier, there is no risk of electrical shock during maintenance.
Principles and Functionality
The main purpose of a fiber optic light source is to facilitate the transmission of light pulses through fibers, a process that relies on total internal reflection. This principle states that when the angle of incidence exceeds a critical value, light is reflected rather than escaping, allowing efficient data transfer via light pulses.
Features of Fiber Optic Light Sources
Fiber optic light sources generally come in rugged, splash-proof cases with simple switch operation. They often feature an indicator for power or low battery levels. A single battery can provide over 40 hours of operation for temperature-compensated LED sources at 850 nm or 1300 nm, offering a 40 dB measurement range with devices like Fiber OWL or Micro OWL. Laser models and sources with 1310 nm or 1550 nm output can offer over 60 hours of usage and a 50 dB measurement range.
In summary, fiber optic light sources are essential for efficient data transmission in fiber optic systems, offering reliable performance with several operational advantages.
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