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Arbitrary-bandwidth Brillouin slow light in optical fibers

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Abstract

Brillouin slow light in optical fibers is a promising technique for the development of all-optical buffers to be used in optical routers. The main drawback of this technique up to now has been its narrow bandwidth, normally restricted to 35 MHz in conventional single-mode optical fibers. In this paper we demonstrate experimentally that Brillouin slow light with an arbitrary large bandwidth can be readily obtained in conventional optical fibers using a simple and inexpensive pump spectral broadening technique. In our experiments, we show the delaying of 2.7 ns pulses over slightly more than one pulse length with only some residual broadening (<25%) of the pulse width. We see no limit to extend this technique to the delaying of GHz-bandwidth signals.

©2006 Optical Society of America

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Figures (4)

Fig. 1.
Fig. 1. Experimental setup. DFB, distributed feedback laser diode; VOA, variable optical attenuator; EOM, electro-optic modulator; EDFA, erbium-doped fiber amplifier.
Fig. 2.
Fig. 2. Pump-probe beating spectrum as recorded in the electrical spectrum analyzer
Fig. 3.
Fig. 3. Pulse waveforms at the fiber output for different gain values.
Fig. 4.
Fig. 4. Delay as a function of the gain achieved in the fiber.

Equations (2)

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g ( Δ ν ) = P ( Δ ν ) g B ( Δ ν )
g B ( Δ ν ) = g B 1 1 2 j ( Δ ν / Δ ν B )
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