对噪声在光纤中传播后的频谱变化的观察

J. M. Chavez Boggio, S. Tenenbaum, A. Guimaraes, H. Fragnito
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引用次数: 1

摘要

只提供摘要形式。我们报道了由激光(频率/spl ω //sub 1/)引起的光噪声谱下降的观测结果。当输入噪声功率较大时,衰减总是发生在频率/spl omega//sub d/=2/spl omega//sub 0/-/spl omega//sub 1/处,其中/spl omega//sub 0/=2/spl pi/c//spl lambda//sub 0/和/spl lambda//sub 0/为光纤的零色散波长。在这些测量中,我们使用了一个可调谐激光二极管,通过铒放大器放大到17.5 dBm,并使用了一个25离子长色散位移光纤(DSF),测量到/spl λ //sub 0/=1551.3 nm。我们展示了激光调谐到四个不同波长时的输入和输出光谱(激光光谱周围的侧瓣是由于调制不稳定效应)。由于/spl ω //sub - d/反映了相对于/spl ω //sub - 0/的激光频率,即/spl ω //sub - 0/=(/spl ω //sub - d/+/spl ω //sub - 1/)/2,因此可以使用此效应作为确定/spl λ //sub - 0/的快速简便方法。我们观察到噪声谱的下降,并将其解释为涉及噪声中两个输入光子湮灭的FWM过程。这种效应可以作为确定光纤零色散波长的一种简单方法。
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Observation of a dip in the spectrum of noise after propagation in an optical fiber
Summary form only given. We report on the observation of a dip in the optical noise spectrum induced by a laser (frequency /spl omega//sub 1/). The dip occurs always at the frequency /spl omega//sub d/=2/spl omega//sub 0/-/spl omega//sub 1/, where /spl omega//sub 0/=2/spl pi/c//spl lambda//sub 0/ and /spl lambda//sub 0/ is the zero dispersion wavelength of the fiber, whenever the input noise power is high. For these measurements we used a tunable laser diode amplified by an erbium amplifier to 17.5 dBm and a 25 ion long dispersion shifted fiber (DSF) with measured /spl lambda//sub 0/=1551.3 nm. We show the input and output spectra with the laser tuned to four different wavelengths (the side lobes around the laser spectrum are due to the modulation instability effect). Since /spl omega//sub d/ mirrors the laser frequency relative to /spl omega//sub 0/, i.e., /spl omega//sub 0/=(/spl omega//sub d/+/spl omega//sub 1/)/2, one can use this effect as a fast and simple method to determine /spl lambda//sub 0/. We observed a dip in the noise spectrum and explained it as a FWM process involving annihilation of two input photons from noise. This effect can be used as a simple method to determine the zero-dispersion wavelength of optical fibers.
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