| 摘要 |
<p>A photo-diode (20) is mounted to a position offset (23) as viewed in the direction orthogonal to the center of an optical axis (14) of backward light (13) of a laser diode (11) in such a manner that a light receiving plane (21) thereof becomes substantially parallel to the center of the optical axis. Alternatively, the photo-diode (20) is mounted thereto so that the light receiving plane of the photo diode is inclined at angles ranging from about 0 DEG to about 30 DEG to the center of the optical axis of the backward light. Further, the photo-diode whose side face on the laser diode side is inclined, is used to repeatedly reflect the backward light between the photo-diode and a laser diode mounting substrate, after which the backward light is launched on the light receiving plane (21). <??>An optical module equipped with a photo-diode for monitoring optical output power of a laser diode can be applied even to a junction up laser diode which reduces the number of parts, reduces even the number of connections by solder or the like and the number of electrical connections by wire bonding or the like, and makes no use of a base for the photo-diode. Thus, low-cost photo-diode mounting can be realized. <IMAGE></p> |
