(EN) This optical semiconductor device (1) comprises: a plurality of semiconductor lasers (2) that output a first beam of light from a front end side, and output a second beam of light from a rear end side on the opposite side to the front end side; an optical multiplexing circuit (4) that multiplexes the first beams of light outputted from the plurality of semiconductor lasers (2) and outputs an output beam of light (7); a plurality of waveguides (8) that guide each of the second beams of light to one end surface (12) side of the optical semiconductor device (1); and a plurality of photodetectors (9) that receive individual reflected beams of light (11), which are second beams of light that have been guided through the waveguide (8) and reflected by the one end surface (12) or inclined end surfaces (35) of a plurality of recesses (14) formed on the one end surface (12). The photodetectors (9) are disposed between the rear end sides of the semiconductor lasers (2) and either the one end surface (12) or the inclined end surfaces (35), and the second beams of light outputted from the waveguide (8) are outputted obliquely with respect to a normal to the one end surface (12) or the inclined end surfaces (35).
(ZH) 光半导体装置(1)具备：多个半导体激光器(2)，它们从前端侧输出第一光，并且从与前端侧相反的一侧即后端侧输出第二光；光合波电路(4)，其对从多个半导体激光器(2)输出的第一光进行合波并将输出光(7)输出；多个波导路(8)，它们将第二光分别向该光半导体装置(1)的一端面(12)侧导波；以及多个光检测器(9)，它们接收在波导路(8)中进行了导波的第二光分别在一端面(12)或在形成于一端面(12)的多个凹部(14)的倾斜端面(35)反射后的各个反射光(11)。光检测器(9)配置于半导体激光器(2)的后端侧与一端面(12)或倾斜端面(35)之间，从波导路(8)输出的第二光相对于一端面(12)或倾斜端面(35)的垂线倾斜地输出。
