Abstract: An optical switch of high performance excellent in insertion loss, the reproducibility of return loss and the temperature property and easily mechanically driven is provided by forming the end faces of optical fibers to be small, the optical fibers are mounted in the optical switch used for switching and cutting off optical transmission lines in optical fiber communications. In the optical switch in the invention, the optical fiber is configured in which the outer diameter of an end part continued to a transmission part for transmitting light is smaller than the outer diameter of the transmission part and greater than the diameter of a core.

Abstract: There is disclosed an optical switch consisting of a support substrate, a movable raw optical fiber, a fixed raw optical fiber, a magnetic member for the movable raw optical fiber, and a leaf spring. The fibers are disposed in a V-shaped groove formed in the substrate. The magnetic member is actuated by an electromagnet disposed above the substrate. The leaf spring pushes the movable raw optical fiber into the V-shaped groove. The structure of the switch is relatively simple. Since the movable raw optical fiber is pushed using the leaf spring, the switch is less affected by the assembly accuracy than conventional. It is easy to make adjustments during assembly. Consequently, high-performance, low-cost, optical switch that can be mass-produced can be offered.

Abstract: When constituting an optical device using an optical fiber having end face slanted with respect to a vertical plane of a core axis, the optical fiber is simply rotation-positioned such that a direction of the end face becomes constant, thereby inexpensively producing the optical device and realizing a miniaturization of the optical device. In the optical fiber having the end face formed at an angle slanted with respect to a plane perpendicular to a core, a plane structure or a concave structure is formed in the optical fiber itself at a predetermined position with respect to a slant direction of the end face, or a holding structure is provided in the optical fiber.