Abstract

The characteristics of RF parasitic modes and the methods to suppress leakage phenomena in LiNbO3 optical modulators were studied. The high frequency RF power transmission characteristics were simulated and experimented in the respects of LiNbO3 wafer thickness, the kind of material contacting the back surface of the modulator chip, the gap and width of the CPW (co-planar waveguide) electrodes. An appropriate RF electrode geometry, to minimize coupling efficiency between co-planar waveguide and substrate mode, is proposed. Experimental results prove that the approaches made in this work are effective for broadening of modulation bandwidth.

© 2004 Optical Society of America

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References

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  1. R. A. Becker, "Traveling-wave electro-optic modulator with maximum bandwidth product," Appl. Phys. Lett. 45, 1168-1170 (1984).
    [CrossRef]
  2. G. K. Gopalakrishnan, W. K. Burns, and C. H. Bulmer, "Electrical loss mechanism in traveling wave LiNbO3 Optical Modulator," Electron. Lett. 28, 207-209 (1992).
    [CrossRef]
  3. Jajid riaziat, Reza Majidi-Ahy, and I-Juang Feng, "Propagation modes and dispersion characteristics of coplanar waveguides," IEEE Trans. Microwave Theory and Technol. 38, 245-251 (1990).
  4. Xiang Zhang, and Tanroku Miyoshi, "Optimum design of coplanar waveguide for LiNbO3 optical modulator," IEEE Trans. Microwave Theory Technol. 43, 523-528 (1995)
  5. Jeng-Wen Huang, and Ching-Kuang C. Tzuang, "Mode-coupling-avoidance of shielded conductor-backed coplanar waveguide using dielectric lines compensation," IEEE MTT-S Digest, 149-152 (1994).
  6. Rangaraj Madabhushi, Yukio Uematsu, Mitsuhiro Kitamura, "Wide-band Ti: LiNbO3 optical modulators with reduced microwave attenuation," ECOC 1997, 2, 29-32 (1997).

Appl. Phys. Lett.

R. A. Becker, "Traveling-wave electro-optic modulator with maximum bandwidth product," Appl. Phys. Lett. 45, 1168-1170 (1984).
[CrossRef]

ECOC 1997

Rangaraj Madabhushi, Yukio Uematsu, Mitsuhiro Kitamura, "Wide-band Ti: LiNbO3 optical modulators with reduced microwave attenuation," ECOC 1997, 2, 29-32 (1997).

Electron. Lett.

G. K. Gopalakrishnan, W. K. Burns, and C. H. Bulmer, "Electrical loss mechanism in traveling wave LiNbO3 Optical Modulator," Electron. Lett. 28, 207-209 (1992).
[CrossRef]

IEEE MTT-S Digest

Jeng-Wen Huang, and Ching-Kuang C. Tzuang, "Mode-coupling-avoidance of shielded conductor-backed coplanar waveguide using dielectric lines compensation," IEEE MTT-S Digest, 149-152 (1994).

IEEE Trans. Microwave Theory and Technol

Jajid riaziat, Reza Majidi-Ahy, and I-Juang Feng, "Propagation modes and dispersion characteristics of coplanar waveguides," IEEE Trans. Microwave Theory and Technol. 38, 245-251 (1990).

IEEE Trans. Microwave Theory Technol.

Xiang Zhang, and Tanroku Miyoshi, "Optimum design of coplanar waveguide for LiNbO3 optical modulator," IEEE Trans. Microwave Theory Technol. 43, 523-528 (1995)

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