H - Electricity – 01 – L
Patent
H - Electricity
01
L
345/26
H01L 31/00 (2006.01) H01L 27/144 (2006.01) H01L 31/105 (2006.01) H04B 10/158 (2006.01)
Patent
CA 2026861
ABSTRACT OF THE DISCLOSURE Most optical communication systems have a function of detecting the presence/absence of a light input. In such an optical communication system, an output optical current generated by a light-receiving element is also consumed by the monitor function. For this reason, when a light input is very weak, a disturbance occurs in an output is very weak, a disturbance occurs in an output electrical signal for information transmission. This invention has its object to provide a light-receiving element which can monitor a light signal input without causing a disturbance in an output electrical signal. For this purpose, according to this invention, a light- receiving element has the first active area irradiated with a light signal, and the second light-receiving element irradiated with a leakage light component of the light signal. An output optical current for information transmission is generated by the light signal radiated on the first active area, and a monitor light output current is generated by the leakage light component of the light signal radiated on the second active area. Therefore, even if an incident light signal is very weak, a monitor output optical signal can be independently generated. For this reason, no disturbance occurs in an output electrical signal for information transmission.
Marks & Clerk
Sumitomo Electric Industries Ltd.
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