What does PD mean in an optical module

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A photodiode is a semiconductor device that converts light into electrical current. Some prescriptions also include OU, short for "oculus uterque," meaning both eyes. The right eye (OD) is almost always listed on the top row, and the left eye (OS) on the bottom. Optical module usually consists of a transmitter assembly (TOSA, containing a laser LD chip), a receiver assembly (ROSA, containing a photodetector PD chip), a driver circuit, an optoelectronic interface, a heat sink (some models), a housing, a pull ring and so on. An optical module is a typically hot-pluggable optical transceiver used in high-bandwidth data communications applications.

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