Multimode Optical Fiber and Methods of Manufacturing Thereof

A multimode optical fiber (MMF) for operating within a spectral window, said MMF comprising:

• a cladding;
• and
• a core, said core having a radius a and a refractive index profile, said core comprising at least one dopant, a concentration of said at least one dopant varying between a center or said core and a,
• wherein said spectral windows is defined by an overlapping range of wavelengths (1) at which said MMF has an effective modal bandwidth (EMB) equal to or above a predefined minimum with one of a peak EMB or a minimum EMB occurring at wavelength λp which is less than a maximum wavelength of said spectral window and (2) at which a differential mode delay (DMD) plot of said MMF exhibits a shift to the left of its higher order modes relative to its lower order modes,
• wherein said DMD plot is measured by launching a plurality of optical pulses into one end of said core at various radial distances r and observing an arrival of said optical pulses at another end of said core at said various radial distances r to determine a velocity of any one of said plurality of optical pulses launched into said core at some radial distance r relative to any other of said plurality of optical pulses launched into said core at some other radial distance r, and
• wherein said shift to the left is characterized by some of said plurality of optical pulses having a faster velocity relative to at least one other optical pulse having a slower velocity, said at least one other optical pulse having a slower velocity being launched into said core at a lower radial distance r than any of said some of said plurality of optical pulses having a faster velocity.