Chapter 20, Problem 20.26P

(a)

Interpretation Introduction

Interpretation:

The quotient power out/power has to be calculated.

Concept introduction:

The quotient power out/power can be calculated using below formula

$\frac{\text{Power}\text{out}}{\text{Power}\text{in}}{\text{=10}}^{\text{-l(dB/m/10)}}$

$\text{dB/m}\text{=}\text{decibel}\text{per}\text{meter}$

$\text{l=}\text{an}\text{optical}\text{fiber}\text{of}\text{length}$

(b)

Interpretation Introduction

Interpretation:

The wavelength of light inside the waveguide and its frequency has to be calculated.

Concept introduction:

The wavelength and frequency is calculated using below the formula

$\begin{array}{l}\text{ Wavelength}\text{=}\frac{{\text{λ}}_{\text{0}}}{\text{n}}\\ \text{where}\\ {\text{λ}}_{\text{0}}\text{=}\text{is}\text{the}\text{wavelength}\text{in}\text{vacuum}\\ \text{n}\text{is}\text{the}\text{rerfactive}\text{index}\end{array}$

Frequency

$\text{υ}\text{=}\frac{\text{c}}{\text{λ}}$