| 摘要 |
<p>It is proposed a multimode optical fibre comprising:
- a core region with a first radius (R1) and a profile alpha with a maximum optical core index,
- an inner depressed cladding extending radially from the first radius (R1) to a second radius (R2),
- a trench extending from the second radius (R2) to a third radius (R3),
- an outer depressed cladding extending radially from the third radius (R3) to a fourth radius (R4),
- an external cladding extending radially from the fourth radius (R4), wherein:
- the volume of the trench is comprised between 1650 x 10 -3 µm 2 and 4500 x 10 -3 µm 2 ,
- the difference in distance between the second radius (R2) and the first radius (R1) is comprised between 0.6 µm and 3.5 µm,
- the fourth radius (R4) is comprised between 30 µm and 47 µm.
The multimode fibre enables to reduce the down-doped cladding to be deposited without increasing the leakage losses of the modes.</p> |
