Patent ID: 6963432

Claim:
An exposure system for forming a grating on a photosensitive fiber, the exposure system comprising: a light source, for generating a light beam; a rotating reflection mirror, for rotating around a pre-determined position as to enable the light beam to be reflected into a first direction after irradiating the rotating reflection mirror; a beam splitter, for splitting the light beam with a pre-determined incident angle into a first split light beam and a second split light beam, both of which share the same intensity; a first fixed reflection mirror, fixed on a first pre-determined position so that the first split light beam is reflected into a second direction after it is irradiated on the first fixed reflection mirror; a second fixed reflection mirror, fixed on a second pre-determined position so that the second split light beam is reflected into a third direction after it is irradiated on the second fixed reflection mirror; and a half-wave plate module, installed facing the third direction as to convert the second split light beam into a light beam with pre-determined polarization; wherein an interference fringe appears where the first split light beam and the light beam with pre-determined polarization intersect such that the grating is formed in the photosensitive fiber according to the interference fringe.