Erbium doped fiber and highly non-linear fiber based on bismuth oxide glasses

Extend L-band amplification, high gain C + L-band amplification for coarse wavelength division multiplexing and short pulse amplification can be realized using bismuth based erbium doped fiber. On the other hand, step-index type fiber using bismuth based glass whose refractive index of 2.22 at 1.55 μm is fabricated. This fiber exhibits high non-linearity (γ = 1360 W−1 km−1) because of the high non-linearity of the glass material and the small effective core area.