Optical Fiber Communications 4th Edition by Gerd Keiser

Exercise 11

A distributed-feedback laser has a Bragg wavelength of 1570 nm, a second-order grating with A = 460 nm, and a 300- µ m cavity length. Assuming a perfectly symmetrical DFB laser, find the zeroth-, first-, and second-order lasing wavelengths to a tenth of a nanometer. Draw a relative amplitude-versus-wavelength plot.