Few mode optical fiber

A few mode optical fiber (100) comprising:

• a core (102), wherein the core (102) is defined by a region around a central longitudinal axis (112) of the few mode optical fiber (100), wherein the core (102) has a super Gaussian refractive index profile with curve parameter gamma γ comprising:
• a first annular region (104), wherein the first annular region (104) lies between the central longitudinal axis (112) of the few mode optical fiber (100) and a first radius r1, wherein the first annular region (104) has a first relative refractive index Δ1, wherein the first radius r1 is in a range of about 14 microns to 16 microns and the first relative refractive index Δ1 is in a range of about 0.50 to 0.70, wherein the first annular region (104) has a super Gaussian profile with curve parameter gamma γ is in a range of 4 to 8 and rescale factor (a) is in a range of about 6.6 microns to T2 microns;
• a second annular region (106), wherein the second annular region (106) concentrically surrounds the first annular region (104), wherein the second annular region (106) lies in between the first radius r1 and a second radius r2, wherein the second annular region (106) has a second relative refractive Δ2, wherein the second radius r2 is in a range of about 17 microns to 22 microns and the second relative refractive index Δ2 is in a range of about −0.01 to 0.01;
• a third annular region (108), wherein the third annular region (108) concentrically surrounds the second annular region (106), wherein the third annular region (108) lies between the second radius r2 and a third radius r3, wherein the third annular region (108) has a third relative refractive index Δ3, wherein the third radius r3 is in a range of 24 microns to 30 microns, wherein the third relative refractive index Δ3 is in a range of −0.27 to −0.32;
• a cladding (110), wherein the cladding (110) concentrically surrounds the third annular region (108), wherein the cladding (110) lies between the third radius r3 and a fourth radius r4, wherein the cladding (110) has a fourth relative refractive index Δ4, wherein the fourth radius r4 is in a range of about 62.2 microns to 62.8 microns and the fourth relative refractive index Δ4 is zero, wherein relative refractive index and the parameters are optimized to achieve and low differential group delay between LP01 guided mode and LP 11 guided mode.