Variable optical attenuator

摘要

A variable optical attenuator comprises an incoming fiber for propagating an incoming light beam, a mirror (40) for reflecting the incoming light beam as a reflected light beam and an outgoing fiber for propagating as an outgoing light beam at least one part of the reflected light beam. The light intensity of the outgoing light beam is determined by the angle of reflection at the mirror (40). The angle of reflection at the mirror (40) are adjusted by an actuator (60) for rotating the mirror (40). The actuator (60) comprises a plate (61), a coil (64), a housing (63) and permanents magnets (65). The mirror (40) and the coil (64) are fixed on the plate (61). The housing (63) supports the plate (61) so that the plate (61) is able to rotate around a rotation axis (61a), which is included on a predetermined plane. The permanent magnets (65) are fixed on the housing (63) and generate predetermined magnetic flux density along the predetermined plane. When a driving current is supplied to the coil (64) under the predetermined magnetic flux density, a Lorentz force occurs at the coil (64) so as to rotate the coil (64). Together with the coil (64), the mirror (40) rotates so that the light intensity of the outgoing light beam can be adjusted. <IMAGE>