Optics and Laser

Single mode fibre For a typical step-index fibre (NA = 0.11, Acut-off = 620 nm) operated in the single-mode regime, estimate the portion of the total power of the LP01 mode which travels in the core and cladding, respectively, as a function of the wavelength. How do you focus a free-space Gaussian TEMOO mode onto the fibre end for optimal coupling efficiency? Jo 10:49