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Direct observations of gravitational waves at frequencies below 10 Hz willplay crucial roles for fully exploiting the potential of gravitational waveastronomy. One approach to pursue this direction is the utilization of laserinterferometers equipped with the Fabry-Perot optical cavities in space.However, a number of challenges lie in this path practically. In particular,the implementation of precision control for the cavity lengths and thesuppression of laser phase noises may prevent a practical detector design. Tocircumvent such difficulties, we propose a new interferometer topology, namedthe back-linked Fabry-Perot interferometer, where the precision length controlsare not required and an offline subtraction scheme for laser phase noises isreadily applicable. This article presents the principle idea and the associatedsensitivity analyses. Despite additional noises, a strain sensitivity of$7\times 10^{-23}$ Hz$^{-1/2}$ may be attainable in the deci-Hertz band.Several technological developments and studies must be carried out to pave theway forward for the implementation.

A back-linked Fabry-Perot interferometer for space-borne gravitational wave observations