The design of a fibre-optic sensor able to measure high-precision angular displacements is presented. The FU Series offers a wide variety of options including thrubeam, reflective, retro-reflective and definite reflective sensing heads. Two configurations are designed: lens-free configuration and GRIN micro-lens configuration for which the. In this paper, a fiber optic microprobe displacement sensor is proposed considering characteristics of micro-Michelson interference structure and its components.