A coated optical fiber comprising: a first coated optical fiber segment comprising a first fiber segment and at least one coating (120,130) disposed on the first fiber segment, wherein at least one coating (120,130) has been removed from an end portion of the first fiber segment; a second coated optical fiber segment comprising a second fiber segment and at least one coating (120,130) disposed on the second fiber segment, wherein at least one coating (120,130) has been removed from an end portion of the second fiber segment, and wherein the end portion of the first fiber segment and the end portion of the second fiber segment abut one another end-to-end; and a splice-junction coating that encapsulates the end portion of the first fiber segment and the end portion of the second fiber segment and contacts the at least one coating (120,130) of the first coated optical fiber segment and the at least one coating (120,130) of the second coated optical fiber segment, wherein the splice-junction coating is a cured polymer product of a precursor composition, the precursor composition comprising: from 0 wt% to 1 wt% of total oligomers; at least 90 wt% of total monomers; and from 2 wt% to 10 wt% of an N-vinyl amide monomer, wherein a Young's modulus of the cured polymer product is greater than or equal to 2000 MPa, and wherein the Young's modulus of the cured polymer product is at least 100 MPa greater than the Young's modulus of the at least one coating of the first coated optical fiber segment and the Young's modulus of the at least one coating of the second coated optical fiber segment. a first coated optical fiber segment comprising a first fiber segment and at least one coating (120,130) disposed on the first fiber segment, wherein at least one coating (120,130) has been removed from an end portion of the first fiber segment; a second coated optical fiber segment comprising a second fiber segment and at least one coating (120,130) disposed on the second fiber segment, wherein at least one coating (120,130) has been removed from an end portion of the second fiber segment, and wherein the end portion of the first fiber segment and the end portion of the second fiber segment abut one another end-to-end; and a splice-junction coating that encapsulates the end portion of the first fiber segment and the end portion of the second fiber segment and contacts the at least one coating (120,130) of the first coated optical fiber segment and the at least one coating (120,130) of the second coated optical fiber segment, wherein the splice-junction coating is a cured polymer product of a precursor composition, the precursor composition comprising: from 0 wt% to 1 wt% of total oligomers; at least 90 wt% of total monomers; and from 2 wt% to 10 wt% of an N-vinyl amide monomer, from 0 wt% to 1 wt% of total oligomers; at least 90 wt% of total monomers; and from 2 wt% to 10 wt% of an N-vinyl amide monomer, wherein a Young's modulus of the cured polymer product is greater than or equal to 2000 MPa, and wherein the Young's modulus of the cured polymer product is at least 100 MPa greater than the Young's modulus of the at least one coating of the first coated optical fiber segment and the Young's modulus of the at least one coating of the second coated optical fiber segment.