Optical fiber device having mode stripper thermally protecting structural adhesive

An optical fiber device includes a first optical element 105 for transmitting light. An output fiber 115 includes an output fiber core 111 having a light receiving end 111a optically aligned to receive light from the first optical element, and includes at least a first outer cladding 120 on a clad portion. The output fiber 115 includes a mode stripper adhesive 225a with a first adhesive composition and a structural adhesive 225b with a second adhesive composition thereon. The mode stripper adhesive 225a is positioned closer to the first optical element 105 than the structural adhesive 225b to strip a majority of power of cladding guided modes of the light before reaching the structural adhesive. The mode stripper adhesive 225a has a lower hardness as compared to the structural adhesive 225b, and is substantially index matched to an outermost layer of the output fiber that it is in direct contact with.