Circular-Birefringence Fiber for Nonlinear Optical Signal Processing
Circular-Birefringence Fiber for Nonlinear Optical Signal Processing
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DOI：
10.1109/jlt.2006.883641
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发表时间：
2006-11
影响因子：
4.7
通讯作者：
Takuo Tanemura;K. Kikuchi
中科院分区：
文献类型：
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作者：
Takuo Tanemura;K. Kikuchi
圆双折射光纤（CBF）或所谓的扭曲光纤为全光信号处理应用提供了新的吸引人的潜力。与标准的非保偏（non-PM）光纤不同，在标准的非保偏（non-PM）光纤中，χ（3）非线性的偏振依赖性被剩余双折射平均化，CBF在非线性波传播方面表现为完全各向同性光纤。因此，CBF允许利用χ（3）非线性的固有绝对偏振依赖性来实现用非PM光纤永远无法获得的新功能。几种类型的CBF成功地制造了扭转商业非PM纤维在15圈/米，其独特的潜力实验证明。首先，利用CBF的椭圆旋转效应实现了一种新型的全光强度调制，这在非保偏光纤中是不存在的。该器件可直接应用于光纤激光器的全光数据整形、脉冲压缩、阶跃抑制和增强锁模。接下来，一个160 Gb/s的偏振不敏感的波长转换演示通过使用交叉相位调制CBF与圆偏振探测波。该方案不仅简单、鲁棒，而且易于实现偏振不敏感的全光数据再生
The circular-birefringence fiber (CBF) or the so-called twisted fiber provides novel attractive potential for all-optical signal-processing applications. Unlike a standard nonpolarization-maintaining (non-PM) fiber, where the polarization dependence of chi(3) nonlinearity is averaged out by the residual birefringence, the CBF behaves as a perfectly isotropic fiber in terms of nonlinear wave propagation. The CBF, therefore, allows the utilization of the intrinsic absolute polarization dependence of chi (3) nonlinearity in realizing novel functions that can never be obtained with a non-PM fiber. Several types of CBF are successfully fabricated by twisting commercial non-PM fibers at 15 turns/m, and their unique potential is experimentally demonstrated. First, a novel type of all-optical intensity discriminator is realized using the effect of ellipse rotation in CBF, which is absent in a non-PM fiber. The demonstrated device is directly applicable to all-optical data reshaping, pulse compression, pedestral suppression, and enhanced mode-locking of fiber lasers. Next, a 160-Gb/s polarization-insensitive wavelength conversion is demonstrated by using cross-phase modulation in CBF with a circularly polarized probe wave. In addition to its simplicity and robustness, the scheme is readily upgradable to polarization-insensitive all-optical data regeneration