Delivering A Fiber Optic Light Source
byon 07-06-2012 at 11:42 AM (179 Views)
"Today low loss fiber optic systems supply virtually unlimited bandwidth and special advantages over all previously created transmission media. The standard optical transmitters convert electrical signals into modulated light for transmission over an optical fiber. The most common devices utilized 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 reasonably big emitting regions and employed for moderate distances. Fiber optic light source prove to be economical.
A fiber optic light supply device is mounted on a package that enables optical fiber to couple as much light as feasible into the fiber. In some cases a tiny spherical lens is also fitted to gather and focus each feasible light onto the fiber. LEDs i.e. light emitting diode and light diodes operate in infrared portion of electromagnetic spectrum. Their operating wavelengths are selected according to the need. Fiber optic light source is dependable and the most widespread wavelengths utilised by fiber optic light source today are 850 to 1300 nanometers or in some situations even 1500 nanometers. Each LEDs and LDs (light diodes) are obtainable in three wavelengths.
There are two techniques by way of which light can be coupled into the fiber optic light source. One is by pig-tailing and the other is putting the fibers tip in really close proximity to an LED or LD. Considering that the only carrier in these systems is light there is no danger of electrical shock to the personnel repairing broken fibers.
Primary function of fiber optic light source is to enable the light pulses move in fiber and works on the principle of total internal reflection, which states that when the angle of incidence exceeds a critical worth light cannot get out of the glass rather it bounces back. The fiber optic light supply functions on this principle as it enables to transmit information down fiber lines in the form of light pulses.
There are several kinds of sources available that act as a fiber optic light source. A fiber optic light source typically comes in a rugged splash proof case and has single switch operation. A fiber optic light source has combination source for showing on or low battery. A single battery in a fiber optic light supply supplies more than 40 hours of operation in case of stable temperature compensated LED with 850 nm and/or 1300 nm fiber optic light supply provide. They provide 40 dB measurement ranges when employed with Fiber OWL or Micro OWL. There are also laser models available in this category.
In case of 1310 nm or 1550 nm output supplies which are temperature compensated, a single battery supplies over 60 hours of operation. It gives 50 dB measurement range when employed with Fiber OWL or Micro OWL. ccna training"