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有乘方律折射率分布的多模光纤的脉冲响应宽度与乘方律指数α值有依赖关系。对于恒定的α来说,只有在α=2-(12/5)附近的极小数值范围内,才能得到最佳脉冲宽度。本文表明,如果α沿光纤缓慢地变化,并以相等的数值平均地偏离在其(常数)最佳值的两边时,这种有非最佳α值的光纤才可得到脉冲响应的最佳宽度。
The impulse response width of a multimode fiber with a refractive index profile with a square law depends on the value of the a factor α. For a constant α, the best pulse width is obtained only for the very small values around α = 2- (12/5). This paper shows that if α varies slowly along the fiber and deviates equally from each other on both sides of its (constant) optimum value, such an optima with a non-optimal value of a can obtain the optimum width of the impulse response .