Abstract

A novel shape-adjustable narrowband optical filter utilizing stimulated Brillouin scattering in an optical fiber is proposed and demonstrated. In this scheme, binary-phase-shift-keying modulation is applied to the pump wave to broaden and shape the Brillouin gain spectrum. By choosing an appropriate modulation data pattern, we realized a flat-top steep-cutoff optical bandpass filter with a 3-dB bandwidth of 1.5 GHz and a 10-dB bandwidth of 2 GHz is realized. In addition, a tunable optical notch filter is also realized by deamplification of the anti-Stokes wave.

© 2002 Optical Society of America

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References

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  1. D. Sadot and E. Boimovich, IEEE Commun. Mag. 36(12), 50 (1998).
    [CrossRef]
  2. C. G. Atkins, D. Cotter, D. W. Smith, and R. Wyatt, Electron. Lett. 22, 556 (1986).
    [CrossRef]
  3. A. R. Chraplyvy and R. W. Tkach, Electron. Lett. 22, 1084 (1986).
    [CrossRef]
  4. K. J. Williams and R. D. Esman, Electron. Lett. 30, 1965 (1994).
    [CrossRef]
  5. A. Loayssa, D. Benito, and M. J. Garde, Opt. Lett. 25, 197 (2000).
    [CrossRef]
  6. A. Loayssa, D. Benito, and M. J. Garde, Opt. Lett. 25, 1234 (2000).
    [CrossRef]
  7. N. A. Olsson and J. P. van der Ziel, J. Lightwave Technol. 5, 147 (1987).
    [CrossRef]

2000 (2)

1998 (1)

D. Sadot and E. Boimovich, IEEE Commun. Mag. 36(12), 50 (1998).
[CrossRef]

1994 (1)

K. J. Williams and R. D. Esman, Electron. Lett. 30, 1965 (1994).
[CrossRef]

1987 (1)

N. A. Olsson and J. P. van der Ziel, J. Lightwave Technol. 5, 147 (1987).
[CrossRef]

1986 (2)

C. G. Atkins, D. Cotter, D. W. Smith, and R. Wyatt, Electron. Lett. 22, 556 (1986).
[CrossRef]

A. R. Chraplyvy and R. W. Tkach, Electron. Lett. 22, 1084 (1986).
[CrossRef]

Atkins, C. G.

C. G. Atkins, D. Cotter, D. W. Smith, and R. Wyatt, Electron. Lett. 22, 556 (1986).
[CrossRef]

Benito, D.

Boimovich, E.

D. Sadot and E. Boimovich, IEEE Commun. Mag. 36(12), 50 (1998).
[CrossRef]

Chraplyvy, A. R.

A. R. Chraplyvy and R. W. Tkach, Electron. Lett. 22, 1084 (1986).
[CrossRef]

Cotter, D.

C. G. Atkins, D. Cotter, D. W. Smith, and R. Wyatt, Electron. Lett. 22, 556 (1986).
[CrossRef]

Esman, R. D.

K. J. Williams and R. D. Esman, Electron. Lett. 30, 1965 (1994).
[CrossRef]

Garde, M. J.

Loayssa, A.

Olsson, N. A.

N. A. Olsson and J. P. van der Ziel, J. Lightwave Technol. 5, 147 (1987).
[CrossRef]

Sadot, D.

D. Sadot and E. Boimovich, IEEE Commun. Mag. 36(12), 50 (1998).
[CrossRef]

Smith, D. W.

C. G. Atkins, D. Cotter, D. W. Smith, and R. Wyatt, Electron. Lett. 22, 556 (1986).
[CrossRef]

Tkach, R. W.

A. R. Chraplyvy and R. W. Tkach, Electron. Lett. 22, 1084 (1986).
[CrossRef]

van der Ziel, J. P.

N. A. Olsson and J. P. van der Ziel, J. Lightwave Technol. 5, 147 (1987).
[CrossRef]

Williams, K. J.

K. J. Williams and R. D. Esman, Electron. Lett. 30, 1965 (1994).
[CrossRef]

Wyatt, R.

C. G. Atkins, D. Cotter, D. W. Smith, and R. Wyatt, Electron. Lett. 22, 556 (1986).
[CrossRef]

Electron. Lett. (3)

C. G. Atkins, D. Cotter, D. W. Smith, and R. Wyatt, Electron. Lett. 22, 556 (1986).
[CrossRef]

A. R. Chraplyvy and R. W. Tkach, Electron. Lett. 22, 1084 (1986).
[CrossRef]

K. J. Williams and R. D. Esman, Electron. Lett. 30, 1965 (1994).
[CrossRef]

IEEE Commun. Mag. (1)

D. Sadot and E. Boimovich, IEEE Commun. Mag. 36(12), 50 (1998).
[CrossRef]

J. Lightwave Technol. (1)

N. A. Olsson and J. P. van der Ziel, J. Lightwave Technol. 5, 147 (1987).
[CrossRef]

Opt. Lett. (2)

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Figures (5)

Fig. 1
Fig. 1

Calculated power spectra of BPSK-modulated light with various data patterns.

Fig. 2
Fig. 2

Experimental setup for measuring the Brillouin gain and the phase shift induced by a BPSK-modulated pump. PCs, polarization controllers. Other abbreviations defined in text.

Fig. 3
Fig. 3

Measured gain and phase-shift spectra for various values of p and pump power. The modulation bit rate is 2 Gbits/s.

Fig. 4
Fig. 4

(a)–(c) Eye diagrams of a nonreturn-to-zero signal transmitted through a SBS filter for increasing signal bit rate. The pump is modulated by a 2Gbits/s pattern with p=9/16 and amplified to 20 dBm. (d) Eye diagram of a 2.5Gbit/s signal without the SBS filter for comparison.

Fig. 5
Fig. 5

Measured (a) Stokes gain spectra and (b) anti-Stokes loss spectra for various modulation bit rates B p=71/128.

Equations (2)

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cτ=1-2pn1-2pBτ-n,nBτ<n+1,
Pf=1Bsin2 πfBπf/B2×4p1-p1+1-2p2-21-2pcos2πf/B.

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