Patent ID: 6972907

Claim:
A tunable laser module comprising: a laser comprising a gain media directed at a pellicle beam splitter, the beam splitter comprising a frame comprising an opening extending there through, the frame comprising a first material having a first coefficient of thermal expansion (CTE), a membrane comprising a film attached to the frame and covering the opening, the membrane comprising a second material having a second CTE, the first CTE being less than the second CTE, the beam splitter being axially aligned with and disposed between an optical fiber and the gain media, the pellicle beam splitter being disposed at an angle with respect to the gain media with the membrane being directed at a detector, the detector, the gain media and the laser being linked by a control circuitry, and a protective frame with an opening in matching registry with the opening of the frame and being disposed over the membrane to sandwich the membrane between the protective frame and the frame.