Multicore optical fiber for high density cable

A multicore optical fiber comprising:

• a glass fiber, the glass fiber comprising:
• a plurality of core elements, each core element comprising:
• a core region, the core region having an outer radius r1 and a relative refractive index Δ1 with a maximum relative refractive index Δ1 max,
• a dedicated cladding surrounding and directly adjacent to the core region;
• a common cladding surrounding and directly adjacent to the dedicated cladding of each of the core elements of the plurality, the common cladding having an outer radius R4 and a relative refractive index Δ4;
• a primary coating surrounding and directly adjacent to the common cladding, the primary coating having a radius R5, a thickness R5−R4, and an in situ modulus less than or equal to 0.30 MPa;
• a secondary coating surrounding and directly adjacent to the primary coating, the secondary coating having an outer radius R6 less than or equal to 110 μm, a thickness R6−R5, and an in situ modulus greater than or equal to 1400 MPa, and;
• wherein each core element of the plurality of core elements has a mode field diameter in the range from 7.3 μm to 8.2 μm at 1310 nm and a macrobend loss at 1550 nm, as determined by a mandrel wrap test using a mandrel with a diameter of 15 mm, of less than or equal to 0.50 dB/turn;
• wherein the core element spacing is greater than or equal to 25 μm;
• and
• wherein the co-propagating crosstalk between each pair of adjacent core elements is less than or equal to −35 dB/km at a wavelength of 1310 nm;
• and
• wherein the co-propagating crosstalk between each pair of adjacent core elements is less than or equal to −25 dB/km at a wavelength of 1550 nm.