A method for fiber stabilization of optical path differences, the method comprising: radiating, by a laser 105, an optical beam; splitting, by a beam splitter 120, the optical beam into a first optical beam and a second optical beam; circulating, by a first circulator 125, the first optical beam through a first bundle of fiber 130 and a first fiber stretcher 135 to a translation stage 140 of an adjustable optical telescope 145; reflecting, by a first mirror 150 on the translation stage 140 of the adjustable optical telescope 145, the first optical beam; circulating, by a first circulator 125, a first circulated beam comprising the reflected first optical beam and an adjustable optical telescope beam; splitting, by a first dichroic beam splitter 155, the first circulated beam into the first optical beam and the adjustable optical telescope beam; circulating, by a second circulator 160, the second optical beam through a second bundle of fiber 165 and optionally a second fiber stretcher 170 to a reference optical telescope 175; reflecting, by a second mirror 180 associated with the reference optical telescope 175, the second optical beam; circulating, by a second circulator 160, a second circulated beam comprising the reflected second optical beam and a reference optical telescope beam; splitting, by a second dichroic beam splitter 185, the second circulated beam into the second optical beam and the reference optical telescope beam; inputting, into an interferometer 190, the first optical beam and the second optical beam; outputting, from the interferometer 190, an in-phase signal and a quadrature signal, which together form a sinusoidal signal; filtering, by at least one processor 142, the sinusoidal signal to form a high frequency signal and a low frequency signal; controlling, with a stage controller 172, the translation stage by using the low frequency signal; and controlling, with a fiber stretcher controller, the first fiber stretcher 135 by using the high frequency signal. radiating, by a laser 105, an optical beam; splitting, by a beam splitter 120, the optical beam into a first optical beam and a second optical beam; circulating, by a first circulator 125, the first optical beam through a first bundle of fiber 130 and a first fiber stretcher 135 to a translation stage 140 of an adjustable optical telescope 145; reflecting, by a first mirror 150 on the translation stage 140 of the adjustable optical telescope 145, the first optical beam; circulating, by a first circulator 125, a first circulated beam comprising the reflected first optical beam and an adjustable optical telescope beam; splitting, by a first dichroic beam splitter 155, the first circulated beam into the first optical beam and the adjustable optical telescope beam; circulating, by a second circulator 160, the second optical beam through a second bundle of fiber 165 and optionally a second fiber stretcher 170 to a reference optical telescope 175; reflecting, by a second mirror 180 associated with the reference optical telescope 175, the second optical beam; circulating, by a second circulator 160, a second circulated beam comprising the reflected second optical beam and a reference optical telescope beam; splitting, by a second dichroic beam splitter 185, the second circulated beam into the second optical beam and the reference optical telescope beam; inputting, into an interferometer 190, the first optical beam and the second optical beam; outputting, from the interferometer 190, an in-phase signal and a quadrature signal, which together form a sinusoidal signal; filtering, by at least one processor 142, the sinusoidal signal to form a high frequency signal and a low frequency signal; controlling, with a stage controller 172, the translation stage by using the low frequency signal; and controlling, with a fiber stretcher controller, the first fiber stretcher 135 by using the high frequency signal.