Abstract

In Brillouin-assisted slow-light the induced delay is always linked to a particular gain; i.e., the delay is directly proportional to the gain expressed in decibels. However, for certain applications this may be restrictive, and techniques to decouple gain and delay are thus of considerable practical interest. We propose a way to effectively decouple these two parameters that, subject to inherent physical constraints, can be used to obtain a delay line capable of providing arbitrary gain (or alternatively an amplifier that can provide arbitrary delay for a fixed gain). The decoupling mechanism relies upon operating the amplifier in the pump-depletion regime. Other advantages of this approach, as well as its limitations in the context of slow-light, are discussed.

© 2007 Optical Society of America

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References

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    [CrossRef]
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    [CrossRef]

2007 (1)

2006 (4)

2005 (4)

Z. Zhu, D. J. Gauthier, Y. Okawachi, J. E. Sharping, A. L. Gaeta, R. W. Boyd, and A. E. Willner, J. Opt. Soc. Am. B 22, 2378 (2005).
[CrossRef]

J. T. Mok and B. J. Eggleton, Nature 433, 811 (2005).
[CrossRef] [PubMed]

M. González Herráez, K. Y. Song, and L. Thévenaz, Appl. Phys. Lett. 87, 081113 (2005).
[CrossRef]

Y. Okawachi, M. S. Bigelow, J. E. Sharping, Z. Zhu, A. Schweinsberg, D. J. Gauthier, R. W. Boyd, and A. L. Gaeta, Phys. Rev. Lett. 94, 153902 (2005).
[CrossRef] [PubMed]

1999 (1)

J. Marangos, Nature 397, 559 (1999).
[CrossRef]

Appl. Phys. Lett. (1)

M. González Herráez, K. Y. Song, and L. Thévenaz, Appl. Phys. Lett. 87, 081113 (2005).
[CrossRef]

J. Lightwave Technol. (1)

J. Opt. Soc. Am. B (1)

Nature (2)

J. T. Mok and B. J. Eggleton, Nature 433, 811 (2005).
[CrossRef] [PubMed]

J. Marangos, Nature 397, 559 (1999).
[CrossRef]

Opt. Express (4)

Phys. Rev. Lett. (1)

Y. Okawachi, M. S. Bigelow, J. E. Sharping, Z. Zhu, A. Schweinsberg, D. J. Gauthier, R. W. Boyd, and A. L. Gaeta, Phys. Rev. Lett. 94, 153902 (2005).
[CrossRef] [PubMed]

Other (1)

Z. Zhu, A. M. C. Dawes, D. J. Gauthier, L. Zhang, and A. E. Willner, in Optical Fiber Communication Conference and Exposition and The National Fiber Optic Engineers Conference, Technical Digest (CD) (Optical Society of America, 2006), paper PDP1.
[PubMed]

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Figures (5)

Fig. 1
Fig. 1

Delay–gain relationship in the linear operational regime (left-hand side of figure) and with pump depletion (right-hand side of figure). The pump depletion regime gives access to the full range of realizable delays with much smaller gain variation than in the normal regime. The shaded region illustrates the area accessible by equalization when operating the amplifier in the normal regime (using only passive attenuating elements).

Fig. 2
Fig. 2

Waveforms in the pump depletion regime for different induced delays. If the delays remain above 0 ns , the distortion induced in the signals is small.

Fig. 3
Fig. 3

Proposed setup for the decoupling of delay and gain in Brillouin-assisted slow light. This system provides an effective decoupling only when working in the pump-depletion regime.

Fig. 4
Fig. 4

Principle of operation of the proposed decoupling technique: by working in the pump-depletion regime and applying increasing attenuation to the output probe, the whole gain–delay space of the system can be swept (gray background).

Fig. 5
Fig. 5

Experimental demonstration of the complete decoupling between delay and gain. It is possible to operate at any arbitrary point within the shaded region.

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