Patent ID: 8581173

Claim:
A fiber optic transceiver (FOT) module comprising: a mounting structure having a mounting structure body and at least a mounting surface, the mounting structure body having a coefficient of thermal expansion (CTE); at least a first active optical device mounted on the mounting surface; a cover secured to the mounting structure and covering said at least one active optical device, the cover comprising a nontransparent molded part having first and second cavities formed therein, the first cavity providing space for at least the first active optical device mounted on the mounting surface of the mounting structure, the nontransparent molded part being nontransparent to a primary wavelength of light used by the FOT module, the nontransparent molded part comprising a material that has a CTE that matches, or substantially matches, the CTE of the mounting structure body, and wherein the cover has an opening formed therein for mechanically coupling an end of an optical waveguide to the cover; and a transparent elastomeric material disposed in the second cavity, the transparent elastomeric material being transparent to the primary wavelength of light used by the FOT module, wherein the transparent elastomeric material has an elasticity that allows it to expand and contract if the second cavity of the cover expands and contracts, and wherein the second cavity filled with the transparent elastomeric material operates as an optical beam transformer for transforming a light beam and coupling the transformed light beam between the active optical device and the end of the optical waveguide.