Definition of cutoff wavelength

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Photonics Dictionary

cutoff wavelength: 1. In detector technology, the long wavelength at which detector response falls to a set percentage (usually 20 or 50 percent). 2. In fiber optics, the shortest wavelength at which a fiber transmits in single mode. Below the cutoff several modes will propagate and the fiber is no longer single-, but multimode. 3. In filter terminology, that wavelength where the filter transmission falls below 5 percent.

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