Ti-Diffused Optical Waveguide with Thin LiNbO3 Structure for High-Speed and Low-Drive-Voltage Modulator

Jungo KONDO  Kenji AOKI  Tetsuya EJIRI  Yuichi IWATA  Akira HAMAJIMA  Osamu MITOMI  Makoto MINAKATA  

IEICE TRANSACTIONS on Communications   Vol.E89-B   No.12   pp.3428-3429
Publication Date: 2006/12/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e89-b.12.3428
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Devices/Circuits for Communications
optical modulation,  optical waveguides,  optical communication,  optoelectronic devices,  

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We examined a Ti-diffused optical waveguide formed on a thin X-cut LiNbO3 substrate for a lower-drive-voltage modulator. Under the single-mode condition, optical mode-size decreases with LiNbO3 substrate thickness below 10 µm. A thin-sheet LiNbO3 modulator could achieve a low-drive-voltage of 1.3 V with a bandwidth of 15 GHz by adopting a narrow electrode-gap.