Through a periodic sinc modulation of the refractive index-profile in fibre Bragg gratings we demonstrate gratings with multiple equally spaced and identical wavelength channels. We show 10 cm long gratings with 4, 8 and 16 identical uniform wavelength channels separated by the ITU spacing of 100 GHz and a 22.5 cm long grating with 4 identical dispersion compensating channels with a 200 GHz separation designed to dispersion compensate 80 km data transmission through standard fibre at 1.55 µm.

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The authors present the realisation of high-quality 1 m long continuouslywritten fibre Bragg gratings designed to compensate both 2nd and 3rd order fibre dispersion. These compact devices are ideal for counteracting the effects of fibre dispersion in high bit-rate transmission systems.

We present a pulsed fiber laser system with average power up to 265 W, pulse energy up to 10.6 mJ, pulse duration adjustable in the range 500 ps-500 ns, repetition rate fully controllable from single-shot operation up to 1 MHz, and the ability to control peak power independently of pulse energy. The system has a compact, all-spliced construction. Such a versatile laser will have wide applications in materials processing.

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