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Question
What is a Module?
Answer
A module is a Unit that combines several elements (devices) and has one function.
Optical Transmission Module
An Optical Transmission Module has a built-in transmission circuit and LED and converts electrical signals to light.
Optical Reception Module
An Optical Reception Module has a built-in reception circuit and PD and converts light to electrical signals.
Optical Transmission and Reception Module
An Optical Transmission and Reception Module contains a transmission circuit and LED and a reception circuit and PD in one case.