Few mode optical fiber

A few mode optical fiber comprising:

• a core region, defined by a region around a central longitudinal axis of the few mode optical fiber, wherein the core region further comprises:
• a first annular region with an updopant and having a first refractive index, defined by the central longitudinal axis and a first radius,
• a second annular region having a second refractive index, between the first radius and a second radius,
• a third annular region with a downdopant and having a third refractive index, between the second radius and a third radius,
• a fourth annular region having a fourth refractive index, wherein the fourth annular region is between the third radius and a fourth radius, and
• a fifth annular region with an updopant and having a fifth refractive index, wherein the fifth annular region is between the fourth radius and a fifth radius;
• and
• a cladding region that is a sixth annular region between the fifth radius and a sixth radius, having a sixth refractive index;
• wherein the few mode optical fiber is operated in six modes including two degenerate Lp01 modes and four degenerate Lp11 modes.