| 摘要 |
A temperature-compensation optical communication interference device compris es first and second optical paths (P1, P2) and a beam splitter (123) disposed a t one ends of the first and second optical paths (P1, P2). A first mirror (124 ) is disposed at the other end of the first optical path (P1). A second mirror (125) is disposed at the other end of the second optical path (P2). The beam splitter (123) and the first and second mirrors (124, 125) are arranged on a base (126). The base (126) is composed of members (126a, 126b, 126c). The si gn of the coefficient of linear expansion of the member (126a) is opposite to that of the members (126b, 126c). The beam splitter (123) and the first and second mirrors (124, 125) are separately arranged on the members (126a, 126b , 126c), respectively. Therefore, the dependence of the difference between the optical path lengths of the first and second optical paths on temperature ca n be lowered.
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