How about the optical-to-electric module
An optical-to-electrical converter is the main component for designing optical instruments. As an essential component of optical fiber communication, optical modules are optoelectronic devices that facilitate the conversion between optical and electrical signals during the transmission process. The frequency response characterization of these electrical-to-optical (E/O, modulators sometimes integrated with lasers) and optical-to-electrical (O/E, photo detectors and receivers) converters can be important in terms of such parameters as bandwidth, flatness, phase linearity and group delay.
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