A single mode fiber has a zero dispersion wavelength of 1.21?m and a dispersion slope of 0.08 psnm^?2km^?1. What is the total first order dispersion at wavelength 1.26?m.

Question

Quizplus · Accepted Answer

The total first order dispersion at a given wavelength can be calculated using the formula: $D = D_0 + S \cdot (\lambda - \lambda_0)$, where $D_0$ is the dispersion at the zero dispersion wavelength ($\lambda_0$), $S$ is the dispersion slope, and $\lambda$ is the wavelength of interest. Given $D_0 = 0$ at $\lambda_0 = 1.21 \mu m$, $S = 0.08 ps/nm^2/km$, and $\lambda = 1.26 \mu m$, the total dispersion at $1.26 \mu m$ is $0 + 0.08 \cdot (1.26 - 1.21) \times 10^3 = 0.08 \cdot 50 = 4 ps/nm/km$. However, this calculation does not directly match any of the provided options, suggesting a possible misunderstanding in the interpretation of the question or a miscalculation. Given the options, the closest approach to a standard calculation would involve recognizing an error in calculation or interpretation based on the provided options. Without a direct calculation leading to the exact figures given in the options, and considering the potential for a typo or misunderstanding in the original question or answer options, a precise explanation based on the standard formula cannot directly validate any of the provided choices accurately.

A Single Mode Fiber Has a Zero Dispersion Wavelength of 1.21?m