OPTICAL TRANSMISSION MODULE

PROBLEM TO BE SOLVED: To provide an optical transmission module capable of suppressing deformation due to heat and deterioration in optical coupling efficiency.SOLUTION: An optical transmission module comprises: a main substrate 1 including a surface and a rear surface; an optical connector 5 including a resin substrate 50; a first transparent substrate 2 arranged between the resin substrate 50 and the main substrate; a heat source element 3 arranged between the resin substrate 50 and the rear surface of the main substrate 1 and electrically connected to the main substrate 1; one or a plurality of wirings for electrically connecting the heat source element 3 and the main substrate 1 and for propagating the heat generated by the heat source element 3 and the first transparent substrate 2 to the main substrate 1; a first space 6 formed between the resin substrate 50 and the first transparent substrate 2 and for propagating the heat generated by the heat source element 3 and the first transparent substrate 2; and a second space 7 formed between the heat source element 3 and the rear surface of the main substrate 1 and for propagating the heat generated by the heat source element 3 and the first transparent substrate 2. 【課題】熱による変形や光結合効率の悪化を抑制できる光伝送モジュールを提供する。【解決手段】表面および裏面を有する本体基板１と、樹脂基板５０を有する光コネクタ５と、樹脂基板５０と本体基板との間に配置された第１の透明基板２と、樹脂基板５０と本体基板１の裏面との間に配置され、本体基板１に電気的に接続された熱源素子３と、熱源素子３と本体基板１とを電気的に接続し、かつ熱源素子３および第１の透明基板２が発する熱を本体基板１に伝搬させる１または複数の配線と、樹脂基板５０と第１の透明基板２との間に形成され、熱源素子３および第１の透明基板２が発する熱を伝搬させる第１の空間６と、熱源素子３と本体基板１の裏面との間に形成され、熱源素子３および第１の透明基板２が発する熱を伝搬させる第２の空間７とを備える。【選択図】図１