B

The wavelength region above which, for a certain bend radius, a fiber can no longer effectively guide the fundamental mode (also known as the fundamental mode cut-off). When a significant proportion of the mode field propagates in the cladding, the light is no longer effectively confined, so losses are high. This is often referred to as the bend-edge and is characterized as the point at which the transmission of the fiber turns sharply downwards.

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Related Terms: Bend Edge, Bend Induced Loss, Cladding, Confinement Factor, Light, Macro-Bending loss, Micro-Bending Loss, Wavelength