: This paper reports the effect of various geometries of fibres in the Fiber Optic Displacement Sensors (FODS). Basically three geometries are studied. i) Two Fiber Sensor; with different offset, separation and inclination. ii) Fiber Optic Bundle Displacement Sensor (FOBDS) Configurations; Concentric Configuration (CC), FOBDS Random Configuration (RC), FOBDS Hemi Circular Configuration (HC). iii) Linear Array; here different type FODS consisting of one transmitting fiber and two non-identical receiving groups are studied. Linear array FODS with weighted sum (FODSWS) is also studied for the performance improvisation. The mathematical replica for the study of intensity modulated fibers, inclined with some angle is developed. It is found the performance parameters of the developed sensor are controlled by different geometrical parameters of the sensor. The model is obtained for sensor consisting of group of fibers, termed as fiber optic bundle displacement sensor (FOBDS) using a ray tracing method. The sensor performance for different geometries like, concentric, random and hemispherical fiber bundle configurations is simulated by means of the generated model. The experimental and simulated results of fiber optic bundle displacement sensor (FOBDS) shows that hemispherical configuration is best for FODS and it shows improvement in sensor performance with respect to two fiber sensor. A scheme of linear array based self-referenced fiber optic displacement sensor with weighted sum (FODSWS) is reported for simultaneous improvement on both linear displacement range and sensitivity. Simulations for linear array based self-referenced FODSWS was carried out. An effect of weight factors applied to each receiving fiber in second receiving group on sensor performance is investigated. Experimentation for linear array based self-referenced FODSWS was also carried out. Sensitivity is increased 5.2 times in comparison with simple self-referenced FODS. Linear displacement range also increased 1.05 times.