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ECE 4370_HW7

# ECE 4370_HW7 - HomeworkAssignment#7...

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ECE 4370 – Fiber and Integrated Optics Homework Assignment #7 Due: Monday, April 19th, 2010 at 5:00pm 1. Bent Wave Guide Consider the waveguide shown with a=3 m, n core = 1.5, n clad =1.498, and R=5mm at =1.33 m. Plot n(r) and and n’(r) on the same graph for = 0, 45, and 90 o . Are these results expected? If the waveguide in carries 2 modes with 1 =70848.8 cm -1 and 2 =70834.7 cm -1 , do you expect significant loss for either or both of these modes? Why? In practice, wrapping fiber around a small mandrel the size of one’s finger is a way to strip higher order modes in a lab-based application. 2. Using the attached example and suggested reading, construct a BPM simulation of a coupler. Use the same indices and core dimensions as in the attached example. Print your code and plot Nave-index profile, aperture profile, starting beam profile, and the beam profile once significant coupling to the second waveguide (not just noise) has occurred. State the approximate propagation distance represented by the latter graph. Hint:

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ECE 4370_HW7 - HomeworkAssignment#7...

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