Figure 3
From: Holographic planar lightwave circuit for on-chip spectroscopy
Simulation of integrated light splitter. Optical responses of one directional light coupler for an input wavelength of (a) 662 nm and (b) 805 nm. The light that enters the splitter is guided to different waveguides according to its wavelength. This device is used to bring light to different DPHs and is the main component that allows the integration of multiple holograms and consequent spectral broadening. (c) The splitting efficiency is mapped in function of the wavelength. For some wavelengths, the part of the light is guided to the opposite DPH. Note that this light would not compromise the device performance as it is not reflected back to the output channels. It is dispersed upwards to the cladding by the DPH and transmitted through it. DPH, digital planar hologram.
