| Experimental study of nonlinear switching characteristics of conventional 2×2 fused tapered couplers |
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| 引用本文： | 刘峰,叶青,罗爱平,邱建荣,朱从善,瞿荣辉,方祖捷.Experimental study of nonlinear switching characteristics of conventional 2×2 fused tapered couplers[J].Chinese Optics Letters,2005(4). |
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| 作者姓名： | 刘峰 叶青 罗爱平 邱建荣 朱从善 瞿荣辉 方祖捷 |
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| 作者单位： | Laboratory of Information Optics,Laboratory of Information Optics,Laboratory of Information Optics,Photon Craft LaboratoryShanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,Photon Craft LaboratoryShanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,Laboratory of Information Optics,Laboratory of Information Optics |
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| 基金项目： | the pre-research item of "973" Project of China (No. 2001CCA04600)
the Science and Technology Development Fund of Shanghai Science Committee (No. 02dj14001). |
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| 摘 要： | The nonlinear switching characteristics of fused fiber directional couplers were studied experimentally. By using femtosecond laser pulses with pulse width of 100 fs and wavelength of about 1550 nm from a system of Ti:sapphire laser and optical parametric amplifier (OPA), the nonlinear switching properties of a null coupler and a 100% coupler were measured. The experimental results were coincident with the simulations based on nonlinear propagation equations in fiber by using super-mode theory. Nonlinear loss in fiber was also measured to get the injected power at the coupler. After deducting the nonlinear loss and input efficiency, the nonlinear switching critical peak powers for a 100% and a null fused couplers were calculated to be 9410 and 9440 W, respectively. The nonlinear loss parameter PN in an expression of αNL=αP/PN was obtained to be PN = 0.23 W.
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