マッハツェンダー型電気光学変調器の波長チャープ評価とゼロチャープ変調の検討 (光エレクトロニクス)  [in Japanese] Evaluation of wavelength-chirp of Mach-Zehnder electro-optic modulators and investigation of zero-chirp modulation  [in Japanese]

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Author(s)

Abstract

ゼロチャープ変調の可能性を検討するためマッハツェンダー型電気光学変調器の波長チャープ特性を解析し,波長チャープを完全に取り除くにはマッハツェンダー干渉計の光分岐比のアンバランスが問題となることを示した.そして,2電極構成のマッハツェンダー型電気光学変調器に,等振幅で逆位相の2つの変調信号を印加するためのラットレース回路と光分岐比の制御電極とを,同一LiNbO_3基板上に直接形成したマイクロ波回路一体型構成の小型光強度変調素子を実際に試作し,その特性を評価した.その結果,10GHzで0.18程度あった小信号動作時のチャープパラメータを,光分岐比を制御することでほぼゼロに補償できることを確認した.

Wavelength-chirp of electro-optic intensity modulators was investigated for zero-chirp modulation. The imbalance in light power splitting ratio between two arms of Mach-Zehnder (MZ) interferometer was found to strongly affect the chirp property. Thereby, we considered a dual-electrode MZ modulator with a microwave rat-race (RR) circuit for the low-chirp modulation. And the electrode for adjusting the light power splitting ratio between two arms of MZ interferometer was prepared on the same substrate to eliminate the residual chirp. The modulator was designed and fabricated on a single LN substrate for around 10 GHz modulation frequencies and 1550 nm light wavelength. The chirp parameter of the modulator was measured to be about 0.08 at 10 GHz. The chirp was reduced to around zero by compensating imbalance of the light power splitting in the waveguide MZ interferometer.

Journal

  • Technical report of IEICE. OPE

    Technical report of IEICE. OPE 114(431), 107-112, 2015-01-29

    The Institute of Electronics, Information and Communication Engineers

Codes

  • NII Article ID (NAID)
    110010008643
  • NII NACSIS-CAT ID (NCID)
    AN10442691
  • Text Lang
    JPN
  • ISSN
    0913-5685
  • NDL Article ID
    026149614
  • NDL Call No.
    Z16-940
  • Data Source
    NDL  NII-ELS 
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