We devised an approach for realizing add-drop filters. This approach uses strip waveguides to couple light into photonic crystal based resonators. We used silicon on insulator substrate with a 240 nm thick Si layer. Theoretical analysis, simulation and experiments were conducted. We compared the new device to a ring-based add-drop filter and found that for rings with radii smaller than 1.414 µm, our device has significant advantages.
Two concepts of performing All-Optical Wavelength conversion are presented and discussed. The novelty of this
manuscript is in presenting a configuration providing increased extinction ratio of conversion. Both concepts are based
on the <i>photorefractive</i> effect in crystals. By generating diffractive photo refractive pattern we improve the conversion
extinction ratio. In the first concept two beam pairs are used to create two index gratings in the medium and by that
receive wavelength conversion. In the second concept, the fanning effect in the photorefractive medium is used to
perform wavelength conversion using only one beam pair. Proof-of-Principle experiments results are presented.
The paper presents techniques for information coding and optical bandwidth reduction that leads to decrease in chromatic dispersion in the optical signal and thus results with an increase in the possible transmission ranges of transceivers.