Low-Driving-Voltage Electro-Optic Modulator With Novel KTa1-xNbxO3 Crystal Waveguides

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概要

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• We have successfully demonstrated a low-driving-voltage electro-optic (EO) modulator using newly developed KTa1-xNbxO3 (KTN) buried waveguides. We prepared high-quality and large KTN crystals. The crystals exhibited a large quadratic EO coefficient of $4.8\times 10^{-15}$ m2/V2 at 1.55 μm. The KTN crystals also exhibited a very large linear EO effect, for example 600 pm/V at a biased potential of 60 V/mm, which is twenty times larger than the $r_{33}$ of LiNbO3. The waveguide layers for the core and cladding were formed by liquid phase epitaxy techniques on the KTN crystals. The propagation loss was less than 0.5 dB/cm and the polarization dependent loss was less than 0.1 dB/cm. The EO modulators had a low $V_{\pi}$ of ${<}2.5$ V (4.0-V biased potential, $l=6$ mm) and a fast response of 3 GHz.

• 2004-08-15

著者

• Toyoda Seiji

  Ntt Photonics Laboratories Ntt Corporation

• Imai Tadayuki

  Ntt Photonics Laboratories

• Matsuura Tohru

  Ntt Photonics Laboratories Ntt Corporation

• ENBUTSU Koji

  NTT Photonics Laboratories

• TATE Akiyuki

  NTT Photonics Laboratories

• Fujiura Kazuo

  Ntt Photonics Laboratories Ntt Corporation

• SHIMOKOZONO Makoto

  NTT Photonics Laboratories, NTT Corporation

• FUSHIMI Hiroshi

  Sendai National College of Technology

• Manabe Katsue

  Ntt Photonics Laboratories Ntt Corporation

• Sasaura Masahiro

  Ntt Photonics Laboratories Ntt Corporation

• Kurihara Takashi

  NTT Photonics Laboratories

• Manabe Katsue

  NTT Photonics Laboratories, NTT Corporation, 3-1 Morinosato, Atsugi, Kanagawa 243-0198, Japan

• Tate Akiyuki

  NTT Photonics Laboratories, NTT Corporation, 3-1 Morinosato, Atsugi, Kanagawa 243-0198, Japan

• Matsuura Tohru

  NTT Photonics Laboratories, NTT Corporation, 3-1 Morinosato, Atsugi, Kanagawa 243-0198, Japan

• Shimokozono Makoto

  NTT Photonics Laboratories, NTT Corporation, 3-1 Morinosato, Atsugi, Kanagawa 243-0198, Japan

• Imai Tadayuki

  NTT Photonics Laboratories, NTT Corporation, 3-1 Morinosato, Atsugi, Kanagawa 243-0198, Japan

• Kurihara Takashi

  NTT Photonics Laboratories, NTT Corporation, 3-1 Morinosato, Atsugi, Kanagawa 243-0198, Japan

• Sasaura Masahiro

  NTT Photonics Laboratories, NTT Corporation, 3-1 Morinosato, Atsugi, Kanagawa 243-0198, Japan

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