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Transcribed Text

Optical signal is propagating along the single-mode 220nm thick silicon-oninsulator rib waveguide at the wavelength of 1550nm. A short area of this device has been implanted with Ge-ions (see image). Ge-ion implantation caused a refractive index change in the silicon slab layer resulting in an increase of the silicon refractive index by Dn=0.5. What happens to the incoming optical signal once it reaches the ion implanted area? Explain your answer.