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The left part of the figure displays the input side of the optical fiber. The pulses are shown in the form of narrow rectangular torque sub I and time duration upper T. These pulses in the fiber core, which is in the cylindrical form in the middle, gets broken into different modes. The different modes from left to right are high order mode, low order mode and axial mode. The inner part of the cylinder is labeled core covered with the outer cylinder, labeled cladding. The right part of the figure displays the output of the pulse. The pulse takes the form of sine wave with temporal width, torque and time, T.