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OPTICAL WAVEGUIDES - Coggle Diagram
OPTICAL WAVEGUIDES
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OPTICAL FIBER WAVEGUIDE
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STEP INDEX FIBER
A FIBER IN WHICH THE CORE IS OF A UNIFORM REFRACTIVE INDEX AND THERE IS A SHARP DECREASE IN THE INDEX OF REFRACTION AT THE CLADDING
THE REFRACTIVE INDEX OF THE CORE IS UNIFORM AND STEP OR ABRUPT CHANGE IN REFRACTIVE INDEX TAKES PLACE AT THE INTERFACE OF CORE AND CLADDING IN STEP INDEX FIBERS
THE LIGHT RAYS PROPAGATE IN ZIG-ZAG MANNER INSIDE THE CORE. THE RAYS TRAVEL IN THE FIBER AS MERIDIONAL RAYS AND THEY CROSS THE FIBER AXIS FOR EVERY REFLECTION
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GRADED INDEX FIBER
A TYPE OF FIBER WHERE THE REFRACTIVE INDEX OF THE CORE IS LOWER TOWARD THE OUTSIDE OF THE FIBER. IT BENDS THE RAYS INWARD AND ALSO ALLOWS THEM TO TRAVEL FASTER IN THE LOWER INDEX OF REFRACTION REGION. THIS TYPE OF FIBER PROVIDES HIGH BANDWIDTH CAPABILITIES
THE REFRACTIVE INDEX OF CORE IS NON-UNIFORM , THE REFRACTIVE INDEX OF CORE DECREASES PARABOLICALLY FROM THE AXIS OF THE FIBER TO ITS SURFACE
THE LIGHT RAYS PROPAGATE IN THE FORM OF SKEW RAYS OR HELICAL RAYS. THEY WILL NOT CROSS THE FIBER AXIS
GRADED INDEX FIBER IS OF ONLY ONE TYPE, THAT IS MULTI MODE FIBER
THE REFRACTIVE INDEX OF THE CORE OF THE GRADED INDEX FIBER IS MAXIMUM AT CENTER, CORE AND THEN IT DECREASES TOWARDS CORE-CLADDING INTERFACE
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GRADED INDEX FIBER PROVIDES ZERO DISPERSION AS THE VELOCITY OF MODES IS CHANGED BY CHANGING R.I SUCH THAT TIME TAKEN BY ALL MODES IS SAME
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MERIDIONAL RAY
ENTERS THE FIBER THROUGH THE FIBER AXIS AND HENCE ALSO CROSSES THE FIBER AXIS ON EACH REFLECTION AS IT ZIGZAGS DOWN THE FIBER. IT TRAVELS IN A PLANE THAT CONTAINS THE FIBER AXIS
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