Patent ID: 9739936
Date: 2017-08-22
CPC Classifications: G02B

Claim:
1. A low-loss few-mode fiber, characterized in that: the few-mode fiber includes, from inside to outside, a core layer ( 1 ), a fluorine-doped quartz inner cladding ( 2 ), a fluorine-doped quartz second core layer ( 3 ), a fluorine-doped quartz depressed cladding ( 4 ) and a fluorine-doped quartz outer cladding ( 5 ); the core layer ( the maximum value of difference in relative refractive index between the core layer ( the relative refractive index difference of the fluorine-doped quartz inner cladding ( the difference in relative refractive index between the fluorine-doped quartz second core layer ( the difference in relative refractive index between the fluorine-doped quartz depressed cladding ( the relative refractive index difference of the fluorine-doped quartz outer cladding (