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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 12, Iss. 12 — Jun. 14, 2004
  • pp: 2568–2573

Effects of parasitic modes in high-speed LiNbO3 optical modulators

Woo Kyung Kim, Woo-Seok Yang, and Han-Young Lee  »View Author Affiliations


Optics Express, Vol. 12, Issue 12, pp. 2568-2573 (2004)
http://dx.doi.org/10.1364/OPEX.12.002568


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Abstract

The characteristics of RF parasitic modes and the methods to suppress leakage phenomena in LiNbO3 optical modulators were studied. The dominant zero-cutoff CBCPW modes and several undesired parasitic modes were analyzed with two-dimensional FEM. The effect of parasitic modes on 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 electrodes. An appropriate RF electrode geometry, to minimize coupling efficiency between co-planar waveguide and substrate mode, is presented. Experimental results proved that the approaches made in this work are effective for broadening of modulation bandwidth.

© 2004 Optical Society of America

OCIS Codes
(060.4080) Fiber optics and optical communications : Modulation
(130.3120) Integrated optics : Integrated optics devices
(130.3730) Integrated optics : Lithium niobate
(230.2090) Optical devices : Electro-optical devices

ToC Category:
Research Papers

History
Original Manuscript: March 3, 2004
Revised Manuscript: May 21, 2004
Published: June 14, 2004

Citation
Woo Kim, Woo-Seok Yang, and Han-Young Lee, "Effects of parasitic modes in high-speed LiNbO3 optical modulators," Opt. Express 12, 2568-2573 (2004)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-12-12-2568


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References

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

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