A all-optical switching based on highly nolinear photonic crystal fiber Sagnac loop mirror

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Abstract
We designed a novel and low switching-power all-optical fiber switch. The highly nonlinear photonic crystal fiber and the bi-directional pumped Er-doped fiber amplifier are inserted into the Sagnac loop mirror simultaneously. The switching is realized based on cross-phase modulation because the symmetry of the loop is broken. The theoretical analysis shows that the switching-power is inverse proportional to the product of the amplifier gain and the nonlinear coefficient of the photonic crystal fiber. In our experiment, 40 mW switching-power and 15.9 dB switching-extinction are obtained; furthermore, the transmission of signal light is a cosine function of the peak power of the control pulse. All the results of experiment well agree with the theory.

Keywords:
all-optical switching /

high nonlinear photonic crystal fiber /

Sagnac loop mirror /

cross-phase modulation
Authors and contacts
Liu Jian-Guo,

Kai Gui-Yun,

Xue Li-Fang,

Zhang Chun-Shu,

Liu Yan-Ge,

Wang Zhi,

Guo Hong-Lei,

Li Yan,

Sun Ting-Ting,

Yuan Shu-Zhong,

Dong Xiao-Yi

1.
南开大学现代光学研究所，天津 300071
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