Abstract

A dual-polarization technique for reducing intermodulation distortion in integrated-optic interferometric modulators is described. While this technique results in a decrease in modulator sensitivity, the intermodulation distortion can be significantly reduced for a given depth of optical modulation by adjusting the relative amounts of TE and TM optical power. Reductions in intermodulation distortion as high as 21 dB were demonstrated by means of this technique with a Ti:LiNbO3 device.

© 1988 Optical Society of America

Full Article  |  PDF Article

References

  • View by:
  • |
  • |
  • |

  1. W. E. Stephens, T. R. Joseph, IEEE J. Lightwave Technol. LT-5, 380 (1987).
    [CrossRef]
  2. P. R. Ashley, W. S. C. Chang, in Digest of Topical Meeting on Integrated and Guided-Wave Optics (Optical Society of America, Washington, D.C., 1986), p. 36.

1987

W. E. Stephens, T. R. Joseph, IEEE J. Lightwave Technol. LT-5, 380 (1987).
[CrossRef]

Ashley, P. R.

P. R. Ashley, W. S. C. Chang, in Digest of Topical Meeting on Integrated and Guided-Wave Optics (Optical Society of America, Washington, D.C., 1986), p. 36.

Chang, W. S. C.

P. R. Ashley, W. S. C. Chang, in Digest of Topical Meeting on Integrated and Guided-Wave Optics (Optical Society of America, Washington, D.C., 1986), p. 36.

Joseph, T. R.

W. E. Stephens, T. R. Joseph, IEEE J. Lightwave Technol. LT-5, 380 (1987).
[CrossRef]

Stephens, W. E.

W. E. Stephens, T. R. Joseph, IEEE J. Lightwave Technol. LT-5, 380 (1987).
[CrossRef]

IEEE J. Lightwave Technol.

W. E. Stephens, T. R. Joseph, IEEE J. Lightwave Technol. LT-5, 380 (1987).
[CrossRef]

Other

P. R. Ashley, W. S. C. Chang, in Digest of Topical Meeting on Integrated and Guided-Wave Optics (Optical Society of America, Washington, D.C., 1986), p. 36.

Cited By

OSA participates in CrossRef's Cited-By Linking service. Citing articles from OSA journals and other participating publishers are listed here.

Alert me when this article is cited.


Figures (3)

Fig. 1
Fig. 1

Analog optical communication link consisting of a constant-power optical source, a polarizer, an interferometric modulator, and a detector, DET.

Fig. 2
Fig. 2

Plot of detector electrical output power level, 20 log(|Pk1TE + Pk1TM|/Pin), for the fundamental, P1,0, and third-order IM product, P1,2, as a function of modulator electrical drive power, 20 log(2ϕmTE/π). The dashed lines indicate single-polarization operation. The solid lines indicate optimized dual-polarization operation with γ = 3.

Fig. 3
Fig. 3

Spectrum analyzer data for (a) single-polarization and (b) dual-polarization operation showing reduction in IM distortion from −46 to −67 dB. The fundamental signals are at 50 and 52 kHz, and the IM signals are at 48 and 54 kHz. For TE polarization, the interferometer phase modulation was ϕmTE = 0.22 rad. The electrical drive power was increased by 10 dB for dual-polarization operation to maintain constant fundamental output power.

Tables (1)

Tables Icon

Table 1 Summary of Experimental and Theoretical Results

Equations (9)

Equations on this page are rendered with MathJax. Learn more.

P out ( t ) = P in 2 { 1 + cos [ ϕ ( t ) + θ ] } ,
ϕ ( t ) = ϕ m ( sin ω 1 t + sin ω 2 t ) .
P out ( t ) = P 0 , 0 + P 1 , 0 ( sin ω 1 t + sin ω 2 t ) + k = 2 P k , 0 ( sin k ω 1 t + sin k ω 2 t ) + k = 1 1 = 1 P k , 1 sin ( k ω 1 + 1 ω 2 ) t + k = 1 1 = 1 P k , 1 sin ( k ω 1 - 1 ω 2 ) t .
P 1 , 0 = P in J 0 ( ϕ m ) J 1 ( ϕ m ) sin θ , P 1 , 2 = P in J 1 ( ϕ m ) J 2 ( ϕ m ) sin θ ,
P 1 , 0 = - P in ϕ m sin θ + higher - order terms , P 1 , 2 = - 1 16 P in ( ϕ m ) 3 sin ϕ + higher - order terms .
ϕ m TE = γ ϕ m TM .
P in TE ( ϕ m TE ) 3 sin θ TE = - P in TM ( ϕ m TM ) 3 sin θ TM .
θ TM = - π 2 ,             θ TE = π 2 ,
P in TM = γ 3 P in TE .

Metrics