An array waveguide multiplexer like that shown in Fig. 5.9 is designed to operate around a center wavelength of 1.55 μm and to have 20 channels spaced 1 nm apart in wavelength. The radius of curvature...

An array waveguide multiplexer like that shown in Fig. 5.9 is designed to operate around a center wavelength of 1.55 μm and to have 20 channels spaced 1 nm

apart in wavelength. The radius of curvature in the focusing slabs is 8 mm. The

input and output waveguide spacing is 125 μm and the array waveguide separation is 7 μm. The index of refraction in the slab regions is 1.67. What is the

required path length difference between adjacent waveguides in the array?