A 10 Gbit/s, 160 Gchip/s OCDMA coding:decoding system based on superstructured fiber gratings

We present results on upgrading the superstructure grating approach to both far higher data rates (10 Gb/s), far shorter chip-lengths (6.4 ps) and far higher grating reflectivities (up to 50%) than previously demonstrated. We demonstrate the flexibility and precision of our continuous scanning fiber/phase mask technique by fabricating both unipolar and bipolar coding and decoding gratings with close to the theoretically designed spectral response, and time domain performance characteristics. We present the results of BER measurements at 10 Gbit/s on a decoded pulse sequence both before and after transmission through 25km of standard fiber which show there to be no noise-penalty associated with either the coding:decoding process, or the transmission of the coded pulse itself.