Abstract

We propose a simple all-fiber solution for coherent beam combining of Er-doped fiber amplifiers. This method, which we believe to be a new method, employs the effect of refractive index changes in Yb-doped fibers induced at 1.55μm by optical pumping at 980  nm, which is performed for an active phase control in the fiber configuration. An algorithm based on population inversion in a two-level system supports the straightforward implementation of the effect into a feedback loop. Combining two 500 mW Er-doped amplifiers in a single-mode fiber is successfully demonstrated with control by 120  mW laser diode. The method is shown to operate against the acoustic phase noise within the range of π  rad and with a rate of 2.6π  rad/ms that potentially serves combining of at least 50 amplifiers similar to those used in practical work.

© 2009 Optical Society of America

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References

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2009 (2)

2008 (2)

2005 (5)

2004 (1)

Alley, Th. G.

Antipov, O. L.

A. A. Fotiadi, O. L. Antipov, and P. Mégret, Opt. Express 16, 12658 (2008).
[PubMed]

A. A. Fotiadi, N. G. Zakharov, O. L. Antipov, and P. Mégret, in Conference on Lasers and Electro-Optics (Optical Society of America, 2008), paper CWB2.

Augst, S. J.

Bellanger, C.

Book, L. D.

Brignon, A.

Bruesselbach, H.

Calia, D. B.

Cheo, P. K.

Colineau, J.

Fan, T. Y.

Feng, Y.

Fotiadi, A. A.

A. A. Fotiadi, O. L. Antipov, and P. Mégret, Opt. Express 16, 12658 (2008).
[PubMed]

A. A. Fotiadi, N. G. Zakharov, O. L. Antipov, and P. Mégret, in Conference on Lasers and Electro-Optics (Optical Society of America, 2008), paper CWB2.

Goodno, G. D.

Grime, B. W.

Huignard, J. P.

Huo, Y.

Jones, D. C.

Mangir, M.

Mangir, M. S.

Mégret, P.

A. A. Fotiadi, O. L. Antipov, and P. Mégret, Opt. Express 16, 12658 (2008).
[PubMed]

A. A. Fotiadi, N. G. Zakharov, O. L. Antipov, and P. Mégret, in Conference on Lasers and Electro-Optics (Optical Society of America, 2008), paper CWB2.

Minden, M.

Rogers, J. L.

Roh, W. B.

Rothenberg, J. E.

Sanchez, A.

Taylor, L.

Wong, Sh.

Zakharov, N. G.

A. A. Fotiadi, N. G. Zakharov, O. L. Antipov, and P. Mégret, in Conference on Lasers and Electro-Optics (Optical Society of America, 2008), paper CWB2.

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Figures (5)

Fig. 1
Fig. 1

(a) Multichannel laser system with coherent beam combining employing RIC in YDF. (b) Experimental setup.

Fig. 2
Fig. 2

Time series of the typical amplifier phase noise (after 2–3 min of operation with maximal power): (a) temperature noise; (b) acoustic noise: natural (black), caused by a flick given on the amplifier (gray).

Fig. 3
Fig. 3

Experimental (a) steady-state and (b) dynamical phase characteristics. (c) Phase response on a double jump of (d) the diode power: positive (black) and inverted (gray). Curves 1–8 are for pulse amplitudes of 20–120 mW.

Fig. 4
Fig. 4

Simulated feedback loop operation for cases of (a),(b) compensated and (c),(d) uncompensated phase noise: (a),(c) laser diode (gray) and channel 2 (black) powers; (b),(d) the reconstructed phase deviation (gray) and reconstructed error signal (black); P a v 60   mW .

Fig. 5
Fig. 5

Experimental operation of two combined amplifiers against the noise: (a) the photodiode signal; (b) the reconstructed phase (gray) and generated error signals (black); (c) the system power without (gray) and with (black) active phase control averaged over thermal noise.

Equations (1)

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Δ φ ( t ) = K τ s p [ 1 exp ( t τ s p ) ] Δ P ,

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