Patent ID: 8649680

Claim:
An optical communication system for carrying out a communication, the optical communication system comprising: an optical fiber for transmitting signal light having a plurality of spatial modes; a multiplex-hologram recording section including holograms recorded therein in a multiplex manner in correspondence with the respective spatial modes of the signal light; a lens for condensing the signal light emitted from an end of the optical fiber and causing the condensed signal light to enter the multiplex-hologram recording section; and a control-light emitting section for emitting control light to the multiplex-hologram recording section at angles different from one another in correspondence with the respective spatial modes, the multiplex-hologram recording section including multiplex holograms recorded therein by irradiation of the multiplex-hologram recording section with (i) guide light which has a wave front identical to a wave front of the signal light and (ii) the control light, the signal light having the spatial modes, the signal light having been multiplexed and inputted to the multiplex-hologram recording section when the multiplex-hologram recording section separates the signal light, being separated along paths of the control-light emitting section in respective directions of emission of the control light.