| 摘要 |
A pair of dielectric windows are respectively formed in a side wall of a metallic package of an optical module in an almost U shape on the side wall surface by packing a dielectric substance in the dielectric windows, and each dielectric window is used as a feed through unit through which a high-frequency signal or a voltage signal is transmitted from the outside to an optical semiconductor element of the optical module. An electromagnetic wave can be transmitted through each dielectric window, and a cutoff frequency of the dielectric window for the electromagnetic wave is considerably lowered as compared with that of a rectangular electromagnetic window in which a length of a longer side is the same as that of the dielectric window. Accordingly, unnecessary electromagnetic waves including electromagnetic waves of low frequencies can be reliably discharged from a cavity of the package to the outside through the dielectric windows, and a cavity resonance of the unnecessary electromagnetic waves in the cavity can be reliably weakened.
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