| 摘要 |
PROBLEM TO BE SOLVED: To solve the following problems in a conventional optical signal processor: since a confocal optical system is constituted having a condenser lens at a nearly intermediate point in a spatial optical path, the distance of a spatial optical system is long; consequently it is difficult to make the whole optical signal processor compact and adjustment processing during manufacture of the optical signal processor requires high accuracy, and costs for the optical signal processor and a manufacturing method therefor are high. SOLUTION: The optical signal processor has greatly shortened length of the spatial optical system by devising a lens arrangement different from that of the confocal optical system. The optical signal processor includes a first condenser lens disposed very nearby a signal processing element and a second condenser lens disposed nearby a spectroscopic element, the distance between the spectroscopic element and the signal processing element is nearly equal to the focal length of the first condenser lens. An optical path length can be shortened to a half of that of a conventional technique. A function of the second condenser lens can be included in an AWG having light condensing operation. COPYRIGHT: (C)2009,JPO&INPIT |
