PRINTED CIRCUIT BOARD, OPTICAL MODULE, AND OPTICAL TRANSMISSION DEVICE

PROBLEM TO BE SOLVED: To provide a printed circuit board which enables selective inhibition of transmission of a common mode signal component to a differential transmission line, and an optical module and an optical transmission device.SOLUTION: A printed circuit board comprises: a grounded conductor layer; a pair of strip conductors extending in a first direction; first resonant conductor three-dimensionally crossing the pair of strip conductors in a second direction; a pair of first via holes connecting the first resonant conductor and the grounded conductor layer; and a dielectric layer including the resonant conductor therein, and being disposed between the grounded conductor layer and the pair of strip conductors. The grounded conductor layer, the first resonant conductor and the pair of first via holes form a first resonant structure. A distance Hbetween the pair of strip conductors and the grounded conductor layer is equal to or larger than twice as much as a distance Hbetween the pair of strip conductors and the first resonant conductor. A line length L of the first resonant conductor is 0.4 wavelength or more and 0.6 wavelength or less in terms of a frequency corresponding to a bit rate.SELECTED DRAWING: Figure 2 【課題】差動伝送線路へのコモンモード信号成分の伝送伝搬を選択的に阻害することが実現されるプリント回路基板、光モジュール、及び光伝送装置の提供。【解決手段】接地導体層と、第１の方向に延伸する１対のストリップ導体と、第２の方向に沿って１対のストリップ導体と立体的に交差する第１共振体導体と、第１共振体導体と接地導体層を接続する１対の第１バイアホールと、第１共振体導体を内部に含み、接地導体層と前記１対のストリップ導体の間に配置される誘電体層と、を備える、プリント回路基板であって、接地導体層と第１共振体導体と１対の第１バイアホールとにより、第１共振体構造が構成され、１対のストリップ導体と接地導体層との距離Ｈ１は、１対のストリップ導体と第１共振体導体との距離Ｈ２の２倍以上であり、第１共振体導体の線路長Ｌは、ビットレートに対応する周波数において０．４波長以上０．６波長以下である。【選択図】図２