| 摘要 |
There provided a small low-cost optical monitor device. In this optical monitor device, input fibers and output fibers are arranged in an array on one side, first lenses are arranged in an array on the optic axes of input optical signals outputted from the input fibers, and second lenses are arranged in an array on the optic axes of output optical signals inputted to the output fibers. Input optical signals is inputted to a coupler film via the first lenses and optical signals which pass through the coupler film will be detected by front incidence type PD elements. On the other hand, output optical signals reflected from the coupler film are inputted to the second lenses separate from the first lenses, from which the input optical signals were outputted, and are coupled to the corresponding output fibers. As a result, a reflection and loop back structure is realized. In this reflection and loop back structure, a plurality of input optical signals are reflected accurately by a coupler film and are outputted. Therefore, an optical monitor device can be miniaturized. In addition, by using generally available members, the costs of an optical monitor device can be reduced.
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