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Optical couplers can achieve
Optical couplers are passive devices that couple light through waveguides or fibers. They play a very important role in the applications of photonic devices and systems. Coupling at optical frequencies presents challenges to achieving high efficiency, compactness, high fabrication tolerance, and ease of integration in photonic integrated circuits. It's primarily employed to combine and split signals in optical networks, and it's also referred to as a directional coupler.