Abstract: A micro-optic fiber device is provided with independent counter-bore tubes and coupling tubes serving as couplers for coupling the optical processing elements, micro lenses and the fiber pigtails. The micro-optic fiber device can be built using direct coupling manner, wherein the optical processing element is firstly inserted and fixed in the step groove of the counter-bore tube by applying bonding agent between the outer periphery of the optical processing element and the inner surface of the step groove, and then the counter-bore tube is coupled with the coupling tubes, thus eliminating the need of using bonding agent between the optical processing element and the micro lenses and preventing the bonding agent from diffusing and spreading over the optical path.

Abstract: A micro-optic fiber device is provided with independent counter-bore tubes and coupling tubes served as couplers for coupling the optical processing elements, micro lenses and the fiber pigtails. The micro-optic fiber device can be built using direct coupling manner. Wherein the optical processing element is firstly inserted in the step groove of the counter-bore tube using bonding agent, and then coupled with the coupling tubes, such as to prevent the bonding agent from diffusing and spreading over the optical path of the optical processing element as well as the micro lenses.

Abstract: An optical filter assembly is provided which includes a first optical filter and a first counteracting ring. The first optical filter is of a filter material that transmits a selected transmission range within a wider range of wavelength of light, and reflects another selected reflection range of the wavelengths. The filter material has a refractory index, whereby heating of the first optical filter tends to cause an increase in refractory index with a corresponding increase in the transmission range in a first direction. The counteracting ring is attached to the first optical filter so that at least some of the light transmits through an aperture in the counteracting ring. Heating of the first counteracting ring causes enlargement of the first counteracting ring, which stretches the first optical filter. The selected transmission range is thereby at least partially stabilized.