A coupler is a device that joins two or more circuits or transmission lines together. Couplers are used in a wide variety of applications, including radio frequency (RF) systems, optical communication, and power transmission. Common types include directional couplers, which sample a portion of the power in a transmission line, and optical couplers, which combine or split optical signals. In plumbing and piping, couplers are fittings used to connect pipes.
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