| 摘要 |
An optical waveguide modulator with an output light monitor hardly restricte d in dimension, having a high reliability, produced at low production cost, an d comprising an optical waveguide element (including surface waveguide parts formed on a dielectric substrate, a coupling part for convergently coupling them, and an output light output waveguide part continuous with the coupling part), an output light optical fiber connected to the output end of the outp ut light output waveguide part of the optical waveguide element, a reinforcing capillary for reinforcing the connection part between the optical waveguide element and the output light optical fiber, and monitor light light-receivin g means, wherein the reinforcing capillary has a through hole or groove accommodating and holding the output light optical fiber, a joined surface joined to the end face on the output side of the substrate of the optical waveguide element, and a fore end face opposite to the joined surface, the reinforcing capillary receives the monitor light outputted from the optical waveguide element by means of at least one of the reinforcing capillary itse lf and the monitor light optical fiber disposed therein, propagates the monitor light, and outputs it outside the reinforcing capillary, and the monitor lig ht light-receiving means is disposed in a position where it receives the monito r light outputted from the reinforcing capillary and has a photo-electric transducing element.
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