| 摘要 |
The invention relates to a temperature-compensated optical communication interference device. The interference device includes first and second optical paths (P1, P2) and a beam splitter (123) disposed at ends of both the fist and second paths (P1, P2). A first mirror (124) is disposed at the opposite end of the first path (P1), and a second mirror (125) is disposed at the opposite end of the second path (P2). The beam splitter (123) and the first and second mirrors (124, 125) are placed on a base (126) composed of members (126a, 126b, 126c). The sign of the coefficient of linear expansion of the member (126a) is opposite to those of the other members (126b, 126c). The beam splitter (123) and the first and second mirrors (124, 125) are separately placed on the members (126a, 126b, 126c), which lowers temperature dependence of the difference between the lengths of the first and second paths. <IMAGE>
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