Abstract

The phase-matching condition required for efficient acousto-optic polarization coupling limits the operation of some types of fiber-optic frequency shifters to relatively low frequencies (1–2 MHz). Collinear phase matching can occur at higher frequencies if the acoustically induced coupling is made spatially periodic. Using this technique, a frequency shifter operating at 5.6 MHz (2.8 times the usual collinear phase-matching frequency) has been demonstrated. A maximum coupling efficiency of 26% was achieved using 32 W of electrical input power. A 3-dB modulation bandwidth of 110 kHz resulted for the design described here. Unwanted spectral components were suppressed by 24 dB.

© 1986 Optical Society of America

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References

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  1. W. P. Risk, R. C. Youngquist, G. S. Kino, H. J. Shaw, Opt. Lett. 9, 309 (1984).
    [CrossRef] [PubMed]
  2. S. S. Tarng, I. C. Chang, in Proceedings of the Ultrasonics Symposium (Institute of Electrical and Electronics Engineers, New York, 1985), paper EE-5.
  3. W. P. Risk, G. S. Kino, H. J. Shaw, Opt. Lett. 11, 115 (1986).
    [CrossRef] [PubMed]
  4. S. E. Miller, Bell Syst. Tech. J. 33, 661, (1954).
  5. C. Lardat, P. Defranould, Proc. IEEE 64, 627 (1976).
    [CrossRef]

1986 (1)

1984 (1)

1976 (1)

C. Lardat, P. Defranould, Proc. IEEE 64, 627 (1976).
[CrossRef]

1954 (1)

S. E. Miller, Bell Syst. Tech. J. 33, 661, (1954).

Chang, I. C.

S. S. Tarng, I. C. Chang, in Proceedings of the Ultrasonics Symposium (Institute of Electrical and Electronics Engineers, New York, 1985), paper EE-5.

Defranould, P.

C. Lardat, P. Defranould, Proc. IEEE 64, 627 (1976).
[CrossRef]

Kino, G. S.

Lardat, C.

C. Lardat, P. Defranould, Proc. IEEE 64, 627 (1976).
[CrossRef]

Miller, S. E.

S. E. Miller, Bell Syst. Tech. J. 33, 661, (1954).

Risk, W. P.

Shaw, H. J.

Tarng, S. S.

S. S. Tarng, I. C. Chang, in Proceedings of the Ultrasonics Symposium (Institute of Electrical and Electronics Engineers, New York, 1985), paper EE-5.

Youngquist, R. C.

Bell Syst. Tech. J. (1)

S. E. Miller, Bell Syst. Tech. J. 33, 661, (1954).

Opt. Lett. (2)

Proc. IEEE (1)

C. Lardat, P. Defranould, Proc. IEEE 64, 627 (1976).
[CrossRef]

Other (1)

S. S. Tarng, I. C. Chang, in Proceedings of the Ultrasonics Symposium (Institute of Electrical and Electronics Engineers, New York, 1985), paper EE-5.

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Figures (5)

Fig. 1
Fig. 1

An edge-bonded PZT transducer is used to launch a Rayleigh wave on the surface of fused-quartz block. A birefringent fiber is pressed against the surface by using a polished silicon block into which has been cut a series of grooves.

Fig. 2
Fig. 2

Measurement system used to evaluate the frequency shifter. The portion in the dashed box was used for measurements of the coupling efficiency as a function of input power and frequency. The remaining components were added to make interferometric measurements of the spectral purity. QWP’s, quarter-wave plates; BS, beam splitter; DET, detector; M’s, mirrors.

Fig. 3
Fig. 3

Coupling efficiency as a function of the electrical input power.

Fig. 4
Fig. 4

Coupling efficiency as a function of the frequency shift.

Fig. 5
Fig. 5

Sideband suppression in the frequency shifter. (a) Production of the upper sideband (horizontal, 2 MHz/division; vertical, 10 dB/division; 300-kHz resolution, 1-sec/division sweep). (b) Production of the lower sideband (horizontal, 2 MHz/division; vertical, 10 dB/division; 300-kHz resolution, 1-sec/division sweep).

Equations (6)

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Δ k = k 2 - k 1 - k a + k g = 0 ,
Λ g = ( 1 Λ a - 1 L b ) - 1 ,
d a 1 d z = - κ ( z ) * a 2 exp [ - j ( k 2 - k 1 ) z ] , d a 2 d z = κ ( z ) a 1 exp [ j ( k 2 - k 1 ) z ] .
κ ( z ) = κ 0 exp ( - j k a z ) acoustic wave { 1 2 + 1 j π n odd 1 n exp ( j n k g z ) } square - wave contact .
P 2 ( L ) P 1 ( 0 ) = 4 κ 0 2 / π 2 4 κ 0 2 / π 2 + Δ κ 2 sin 2 [ 1 2 ( 4 κ 0 2 / π 2 + Δ k 2 ) 1 / 2 L ] ,
η = P / P 0 P / P 0 + 4 N a 2 ( Δ f / f 0 ) 2 × sin 2 { π 2 [ P P 0 + 4 N a 2 ( Δ f f 0 ) 2 ] 1 / 2 } ,

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