Today low loss fiber optic systems offer almost unlimited bandwidth and unique advantages over all previously developed transmission media. The basic optical transmitters convert electrical signals into modulated light for transmission over an optical fiber. The most common devices used as the light source in optical transmitters are light emitting diode. Fiber optic light source make a good use of this, as light emitting diodes have relatively large emitting areas and used for moderate distances. Fiber optic light source prove to be economical.
A fiber optic light source device is mounted on a package that enables optical fiber to couple as much light as possible into the fiber. In some cases a tiny spherical lens is also fitted to collect and focus each possible light onto the fiber. LEDs i.e. light emitting diode and light diodes operate in infrared portion of electromagnetic spectrum. Their operating wavelengths are chosen according to the need. Fiber optic light source is reliable and the most common wavelengths used by fiber optic light source today are 850 to 1300 nanometers or in some cases even 1500 nanometers. Both LEDs and LDs (light diodes) are available in...
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