1 Each WMC is engraved with the item #, serial number, and wavelength range for easy identification. An optical circulator is a three- or four-port optical device designed such that light entering any port exits from the next. This means that if light enters port 1 it is emitted from port 2, but if some of the emitted light is reflected back to the circulator, it does not come out of port 1 but. Thorlabs' Optical Circulators are non-reciprocating, one-directional, three port devices which are great for bidirectional propagation of light in a single fiber. Unlike optical isolators that block reflected light, a circulator routes optical signals in a specific order — typically Port 1 → Port 2 and Port 2 →. Fiber optic circulators act as signal routers, transmitting light from an input fiber to an output fiber, but directing light that returns along that output fiber to a third port. It functions by allowing light to travel in one direction while preventing it from returning to its source. This unidirectional flow is crucial in. Use our unidirectional multi-port couplers to safely separate and manipulate forward (i., receive) signals without crosstalk and with low insertion loss.
