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Variable-field aspect-ratio transformer with cascaded graded-index oval-core fibers
Kazuo Shiraishi1, Akira Ogura, Hidehiko Yoda
17-1-2 Yoto, Utsunomiya University, Utsunomiya 321-8585, Japan. kazuos@cc.utsunomiya-u.ac.jp
Optics Letters
|September 30, 2003
Abstract:
A new configuration is proposed for continuously transforming aspect ratios of field-intensity distributions in optical fibers. The field aspect ratio varies in proportion to the angle between the principal axes of two cascaded graded-index oval-core fibers. The highest aspect-ratio conversion is obtained at an angle of 90 degrees. The conversion effect is numerically and experimentally confirmed, showing that a circular field is successfully transformed into an elliptical one with an aspect ratio as high as 9 at a wavelength of 0.98 microm.