A multi-port passive optical device based on the Faraday rotation effect, its core function is to realize unidirectional transmission of optical signals along a specified path, while exhibiting high isolation in the reverse direction. It can effectively avoid interference from reflected signals and serves as a key component to ensure signal transmission purity in fields such as optical communication and optical sensing.

It has a wide range of applications, including single-fiber bidirectional transmission in optical communication systems, resonator isolation of fiber lasers, interference suppression in optical sensing systems, and directional optical path control in quantum information research. It provides stable and efficient optical path solutions for various optoelectronic systems, helping to improve system performance and reliability.

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