Abstract: Field-configurable optical devices and methods are disclosed. In one example, a field-configurable optical device includes a housing defining an enclosure, an input port located at the housing, a pass-through port located at the housing, a plurality of output ports located at the housing, a splitter disposed within the enclosure, a plurality of couplers within the enclosure, each coupler including an input, a first output, and a second output. Each coupler has a power splitting ratio between the first output and the second output that is different from the other couplers. An input port fiber optic jumper assembly within the enclosure. A pass-through port fiber optic jumper assembly is within the enclosure. Moving the input port fiber optic jumper assembly and the pass-through port fiber optic jumper assembly from a first coupler to a second coupler of the plurality of couplers changes the power splitting ratio of the field-configurable optical device.