Optical Fiber Communications 4th Edition by Gerd Keiser

Exercise 7

For a fiber optic link using a single-longitudinal- mode laser with a 3-dB linewidth of v and having two fiber connectors with reflectivities R 1 and R 2 , the worst-case RIN occurs when the direct and doubly reflected optical fields interfere in quadrature. 51 If is the light-travel time in the fiber, this is described by
where f is the carrier frequency. Show that this expression reduces to
and