Core fields in graded fibres with non-circular index contours
Optical and Quantum Electronics, 11, (6), . (doi:10.1007/BF00620378).
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Fields in the cores of graded noncircular optical fibres are analysed using a new method. It is shown that the scalar wave equation in elliptical co-ordinates can be separated for many realistic noncircular profiles, thus allowing calculation of fields by a double WKB method. The boundaries separating oscillatory and evanescent regions are found by simple analysis of algebraic equations. This method supports and further explains previous analysis which used geometric optics.
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