Abstract
Recently, there has been an increasing interest in developing single
polarization fibers for applications such as polarization splitters, polarizers,
high power lasers, etc. Usually, the polarization maintenance can be achieved
by form birefringence, such as by creating elliptical cores, or material anisotropy,
or by stress-applying parts inside the fiber. However, this results into the
non-Gaussian field distributions due to the distortion of fiber core, therefore
leading to the degradation of beam quality factor $M^{2}$. In this study, we propose a design method for
single-polarization holey fibers with improved beam quality by introducing
the resonant coupling phenomenon between the central depressed core and the
elliptical cores arranged on either side of the central core. The proposed
single-polarization holey fiber with 1-m length has the extinction ratio of
30 dB over 10-nm wavelength range and a good beam quality factor $M^{2}=1.31$.
© 2008 IEEE
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