Fig. 1. Schematic diagram of coordinate system

Fig. 2. Schematic diagram of active cable connection

Fig. 3. Angular velocity of optical axis with or without elastic moment

Fig. 4. Angle with or without cable elastic moment

Fig. 5. Schematic diagram of motional cables trajectory

Fig. 6. Schematic of fixed points selection of motional cables

Fig. 7. Beam splitting diagram of multi-strand cables