Abstract

We demonstrate, via simulation and experiment, slowing down of a phase-modulated optical signal. A 10.7-Gb/s NRZ-DPSK signal can be delayed by as much as 42 ps while still achieving error free via broadband SBS-based slow light. We further analyze the impact of slow-light-induced data-pattern dependence on both constructive and destructive demodulated ports. By detuning the SBS gain profile, we achieve 3-dB Q-factor improvement by the reduction of pattern dependence. Performance comparison between NRZ-DPSK and RZ-DPSK shows that robustness to slow-light-induced pattern dependence is modulation format dependent.

© 2007 Optical Society of America

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References

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  1. R. W. Boyd and D. J. Gauthier, "Slow and fast light," in Progress in Optics, E.Wolf, ed. (Elsevier, Amsterdam, 2002), Vol. 43, chap. 6, pp. 497-530.
  2. L. Zhang, T. Luo, W. Zhang, C. Yu, Y. Wang and A. E. Willner, "Optimizing operating conditions to reduce data pattern dependence induced by slow light elements," in proceedings of OFC 2006, Anaheim, CA, 2006, paper OFP7.
  3. Z. Zhu, A. M. C. Dawes, D. J. Gauthier, L. Zhang, and A. E. Willner, "12-GHz-Bandwidth SBS slow light in optical fibers," J. Lightwave Technol. to be published in issue 1, 2007.
  4. Y. Okawachi et al, "All-optical slow-light on a photonic chip," Opt. Express 14, 2317-2322 (2006),
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  6. Z. Chen, B. Pesala, and C. J. Chang-Hasnain, "Experimental demonstration of slow light via four wave mixing in semiconductor optical amplifiers," in proceedings of OFC 2006, Anaheim, CA, 2006, paper OWS1.
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    [CrossRef]
  8. G. P. Agrawal, "Nonlinear Fiber Optics," 3rd edition, (Elsevier Science, USA, 2001), Chap. 3.
  9. E. Shumakher, N. Orbach, A. Nevet, D. Dahan and G. Eisenstein, "On the balance between delay, bandwidth and signal distortion in slow light systems based on stimulated Brillouin scattering in optical fibers," Opt. Express 14, 5877-5884 (2006).
    [CrossRef] [PubMed]
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    [CrossRef] [PubMed]

2006

2005

Blit, R.

Dahan, D.

Eisenstein, G.

Gnauck, A. H.

Nevet, A.

Okawachi, Y.

Orbach, N.

Shumakher, E.

Willinger, A.

Winzer, P. J.

J. Lightwave Technol.

Opt. Express

Other

Y. Su, L. Yi, and W. Hu, "System performance of a slow-light delay line for 10-Gb/s data packets," in proceedings of Slow and fast light topical meeting, Washington D.C., 2006, paper WB4.

Z. Chen, B. Pesala, and C. J. Chang-Hasnain, "Experimental demonstration of slow light via four wave mixing in semiconductor optical amplifiers," in proceedings of OFC 2006, Anaheim, CA, 2006, paper OWS1.

R. W. Boyd and D. J. Gauthier, "Slow and fast light," in Progress in Optics, E.Wolf, ed. (Elsevier, Amsterdam, 2002), Vol. 43, chap. 6, pp. 497-530.

L. Zhang, T. Luo, W. Zhang, C. Yu, Y. Wang and A. E. Willner, "Optimizing operating conditions to reduce data pattern dependence induced by slow light elements," in proceedings of OFC 2006, Anaheim, CA, 2006, paper OFP7.

Z. Zhu, A. M. C. Dawes, D. J. Gauthier, L. Zhang, and A. E. Willner, "12-GHz-Bandwidth SBS slow light in optical fibers," J. Lightwave Technol. to be published in issue 1, 2007.

G. P. Agrawal, "Nonlinear Fiber Optics," 3rd edition, (Elsevier Science, USA, 2001), Chap. 3.

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Figures (6)

Fig. 1.
Fig. 1.

Left: A) Concept of slow light on phase-modulated optical signals. B) Slow-light-induced data-pattern dependence on demodulated two output ports. Right: Simulation result of phase patterns of a 10-Gb/s DPSK signal before and after 8GHz BW slow light element. Phase is preserved and delayed by 46 ps.

Fig. 2.
Fig. 2.

Left: Experimental Setup for DPSK slow-light based on broadband SBS. Right: Observation of DPSK slow-light: continuous delay of up to 42 ps for a 10.7Gb/s DPSK signal.

Fig. 3.
Fig. 3.

Slow-light-induced data-pattern dependence: 10.7-Gb/s NRZ-DPSK through an 8-GHz slow light element. Bit patterns before (NRZ-DPSK) and after (DB and AMI) demodulation are shown before and after slow light.

Fig. 4.
Fig. 4.

Left: BER measurement of DB port from 10.7-Gb/s DPSK signals after SBS slow light element. Data-pattern dependence and Rayleigh crosstalk (shown in the spectrum) are the two main reasons for DPSK signal degradation. Right: Power penalty comparison between 2.5-Gb/s and 10-Gb/s NRZ-DPSK shows that data-pattern dependence is bit-rate specific.

Fig. 5.
Fig. 5.

Reduction of DPSK data-pattern dependence by detuning the SBS gain peak: 3-dB Q factor improvement on the AMI port demodulated from 10.7-Gb/s DPSK signals is achieved.

Fig. 6.
Fig. 6.

Left: Delay for 2.5-Gb/s NRZ and RZ-DPSK with the same 5-GHz SBS BW. The fractional delays for both NRZ and RZ-DPSK are comparable. Right: RZ-DPSK outperforms NRZ-DPSK by as much as 2dB, which shows its robustness to data-pattern dependence.

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