Linden Photonics (Westford, MA) has developed the Strong Tether Fiber Optic Cable (STFOC), a 0.030"diameter cable with a tensile strength in excess of 50 lbs. STFOC is radhard, impervious to moisture and oxygen, chemically stable, and capable of operating at up to 250°C. Custom versions are designed to work over 300°C. Linden has also developed “STFOC Non-Kink” which is virtually unkinkable. This fiber optic cable combines all features of the standard STFOC, while adding a protective secondary non-kinking layer.