In this paper, we propose a new polarization splitter constructed from a circular core fiber (fiber1) and an elliptical core fiber (fiber2). The polarization splitters are designed so that the
x-polarization and the
y-polarization are derived from the fiber2 and the fiber1, respectively. The device length
Lm and the bandwidth
BW-15 at
R≤-15dB (
R: the extinction ratio) are discussed by adjusting mainly the ellipticity
e2 of the core in the fiber2 and the relative index difference
Δ2 of the fiber2. When
e2 and
Δ2 are varied in the range 0.60≤
e2≤0.85 and 0.5%≤
Δ2≤1.0%, respectively, it is found that: (1)
Lm takes its minimum value 18.96mm at
Δ2=1.0% and
e2=0.79; (2)
BW-15 takes its maximum value 4.98nm at
Δ2=1.0% and
e2=0.85.
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