Patent ID: 7130502
Filing Date: 2006-10-31
Classification: G02B

Abstract:
1. A wavelength division multiplexing optical coupler comprising: an input optical fiber for emitting a flux of light multiplexed with a plurality of wavelengths from an end face thereof; a first lens having a first face into which the flux of light emitted from the input optical fiber is input, and a second face from which the flux of light converted into a flux of parallel light is emitted; a first optical filter group comprising a plurality of optical filters through which predetermined wavelength ranges of light are transmitted respectively aligned along a direction of advancing the flux of parallel light so as to be fixed on a side of the second face of the first lens by angles different from each other relative to an optical axis of the first lens such that fluxes of light in predetermined wavelength ranges included in the flux of parallel light are reflected respectively in predetermined directions; a set of output optical fibers, end faces of which are arranged at positions at which fluxes of parallel light arranged by the respective optical filters of the first optical filter group are focused respectively by input into the second face and emitted from the first face of the first lens; a second optical filter group for transmitting the predetermined wavelength ranges arranged between the first face of the first lens and the respective end faces of the set of the output optical fibers for coupling the fluxes of light reflected by the respective optical filters of the first optical filter group; a second lens having a third face from which a flux of light transmitting through all of the optical filters of the first optical filter group is input and a fourth face from which the flux of light is emitted; and at least one further optical fiber, an end face of which is arranged at a position of coupling the focused flux of light from the second lens.