| 摘要 |
<p>A multimode optical fibre comprising an optical core surrounded by an outer optical cladding, the optical core from the centre to the periphery: a central core having a radius (r 1 ) and an alpha-index profile with respect to an outer optical cladding, a depressed trench situated at the periphery of the central core having a width (w t ) and a refractive index difference (”n t ) with respect to the outer optical cladding, in which the diameter of the central core has a value of 50 ± 3 µm, the width (w t ) of the depressed trench is comprised between 0.5 µm and 2 µm, and the refractive index difference (”n t ) of the depressed trench with respect to the outer optical cladding is comprised between - 4×10 -3 and -1 ×10 -3 .</p> |
