Fast wavelength-hopping time-spreading encoding/decoding for optical CDMA

Abstract—We demonstrate a new technique for implementation of fast wavelength-hopping incoherent optical code-division multiple-access (CDMA). The output pulse from a mode locked laser is spectrally broadened through supercontinuum generation. This pulse is then encoded into fast wavelength-hopped time-spread waveforms through a wavelength-selective time-delay device. At the receiver, matched-filter decoding is used to recover data. We present a 1-Gb/s digital transmission experiment through a 15-km dispersion-shifted (DS) single-mode fiber link. This technique avoids the need for a fast wavelength tunable optical source. Index Terms—Mode locked laser, optical CDMA, optical processing. I

3D AFM Characterization of the Edge Roughness of Silicon High Q Resonators

International audienceNanophotonic resonators are very sensitive to sidewall roughness. We investigate in detail the sidewall roughness, correlation length and fractal roughness exponent for high Q silicon resonators using a 3D AF