Abstract

We report a novel kind of all-optical dynamic grating based on Brillouin scattering in a polarization maintaining fiber (PMF). A moving acoustic grating is generated by stimulated Brillouin scattering between writing beams in one polarization and used to reflect an orthogonally polarized reading beam at different wavelengths. The center wavelength of the grating is controllable by detuning the writing beams, and the 3dB bandwidth of 80MHz is observed with the tunable reflectance of up to 4% in a 30m PMF.

© 2008 Optical Society of America

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References

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2006 (3)

2005 (1)

1993 (1)

1992 (1)

Agrawal, G. P.

G. P. Agrawal, Nonlinear Fiber Optics, 2nd ed. (Academic, 1995).

DiGiovanni, D. J.

Fan, X.

Fischer, B.

Frisken, S. J.

González Herráez, M.

He, Z.

Hotate, K.

Mizuno, Y.

Song, K. Y.

Sulhoff, J. W.

Thávenaz, L.

Zou, W.

W. Zou, Z. He, and K. Hotate, IEEE Photon. Technol. Lett. 18, 2487 (2006).
[CrossRef]

Zyskind, J. L.

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Figures (5)

Fig. 1
Fig. 1

Experimental setup: LD, laser diode; SSBM, single-sideband modulator; EDFA, Er-doped fiber amplifier; PBC, polarization beam combiner; OSA, optical spectrum analyzer. The inset is the Brillouin gain spectra of the fiber under test in x and y polarizations.

Fig. 2
Fig. 2

Optical spectra monitored by an OSA in the generation of dynamic grating. The gray curve corresponds to the case that one (pump1) of the writing beams is turned off, and the black curve with both writing beams turned on.

Fig. 3
Fig. 3

(a) Reflectance of the dynamic grating as a function of Δ ν , the frequency difference between the pump1 and the probe. (b) Reflectance of the dynamic grating at a fixed Δ ν ( 72.6 GHz ) as a function of the Δ f , the frequency offset between pump1 and pump2. The curve shows the result of a Lorentzian fit.

Fig. 4
Fig. 4

Reflectance of the dynamic grating as a function of pump power in the case of (a) pump1 varied and pump2 fixed to 10 mW , and (b) pump2 varied and pump1 fixed to 200 mW . The line is the result of a linear fit.

Fig. 5
Fig. 5

Optical frequency of the probe as a function of the frequency of pump1 under the condition of the dynamic grating generation. The line is the result of a linear fit.

Equations (5)

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ν B = 2 n V a λ ,
2 n x V a λ x = 2 n y V a λ y ,
n x ν x = n y ν y ,
Δ ν = Δ n n ν .
R = P probe out P probe in Δ P 2 P 1 = P 2 ( e ( g B P 1 L eff A eff ) 1 ) P 1 ,

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