| 摘要 |
PROBLEM TO BE SOLVED: To obtain a package which effectively prevents deterioration in the transmission characteristics for high frequency signals, which avoids increase in the back height of a photosemiconductor package, which effectively prevents decrease in the coupling efficiency of light in the environment test, and thereby, to control the operating property of a photosemiconductor device to be normal and stable for a long time. SOLUTION: The package has an electrode pad 6 for electric connection between a photosemiconductor device 3 and the outside and a cap 2 attached to the upper face of the base body 1 to seal the photosemiconductor device 3. The electrode pad is formed along two side lines which are opposing to each other on the lower face of a base body 1 and which are almost parallel to an optical fiber 5. A connection pad 8 is formed in the region extended from the region just under a mounting substrate 4 on the lower face and along the optical axis of the optical fiber 5, with the connection pad 8 possessing >=60% of the area of the extended region.
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