Patent ID: 8036506

Claim:
A tunable optical filter comprising: an end section of a first single-mode optical fiber having an end surface; an end section of a second single-mode optical fiber longitudinally aligned with said first single-mode optical fiber end section, said second single-mode optical fiber end section having an end surface facing said end surface of said first single-mode optical fiber end section; piezoelectric material controlling the separation between said first single-mode optical fiber end section and said second single-mode optical fiber end section and selecting wavelengths of optical signals carried through said end sections of said first and second single-mode optical fibers; and a collimator fiber section having a first end surface angled from a perpendicular plane to a longitudinal axis common to said at least one single-mode optical fiber end section and said collimator fiber section and joined to said end surface of said at least one single-mode optical fiber end section, said end surface of said at least one single-mode optical fiber end section reciprocally angled to said first end surface of said collimator fiber section.