Figure 1
From: Holographic planar lightwave circuit for on-chip spectroscopy
Schematic of an integrated DPH spectrometer. The spectrometer-on-chip integrates one or multiple digital planar holograms and optical circuitry for coupling and wave-splitting operations. The light is brought to the chip with an optical fiber and coupled through a planar taper; light is guided with low losses by ridge waveguides and split based on its bandwidth by directional couplers; once directed to the hologram operating in the relative band, light is demultiplexed and focused on several different output channels at the edge of the chip. DPH, digital planar hologram.
