National University Corporation Hokkaido University
대리인 / 주소
Renner, Otto, Boisselle & Sklar, LLP
인용정보
피인용 횟수 :
3인용 특허 :
1
초록▼
The present invention causes spatial-mode light emitted from an optical fiber (11), which is a multimode fiber, to pass through a photorefractive medium (13). The photorefractive medium (13) includes holograms for signal separation that are written by irradiation of the photorefractive medium with (
The present invention causes spatial-mode light emitted from an optical fiber (11), which is a multimode fiber, to pass through a photorefractive medium (13). The photorefractive medium (13) includes holograms for signal separation that are written by irradiation of the photorefractive medium with (i) guide light having a wave front identical to the wave front of signal light having a particular spatial mode and (ii) control light. The photorefractive medium includes holograms recorded in a multiplex manner with use of control light having different incidence angles in correspondence with respective spatial modes. For signal separation, irradiating the photorefractive medium (13) with control light (15) having a particular angle separates signal light having a spatial mode corresponding to the incidence angle of the control light (15).
대표청구항▼
1. 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 cor
1. 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; anda 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. 2. The optical communication system according to claim 1, further comprising: a random-phase plate disposed on a side of the multiplex-hologram recording section from which side the signal light enters the multiplex-hologram recording section. 3. The optical communication system according to claim 1, further comprising: a phase conjugator for (i) amplifying light having passed through the multiplex-hologram recording section and (ii) returning the amplified light to the multiplex-hologram recording section. 4. The optical communication system according to claim 1, wherein:the multiplex-hologram recording section is a photorefractive medium. 5. 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; anda 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,with use of the multiplex-hologram recording section, which includes holograms written therein by irradiation of the multiplex-hologram recording section with (i) guide light which has a wave front identical to a wave front of a signal light beam having a particular spatial mode and (ii) the control light, the optical communication system causing holograms to be recorded in a multiplex manner by the control-light emitting section for emitting the control light to the multiplex-hologram recording section at the angles different from one another in correspondence with the respective spatial modes,after the recording, the optical communication system, when the multiplex-hologram recording section separates the signal light for a signal communication, emitting (i) the guide light which has the wave front identical to the wave front of the signal light beam having the particular spatial mode and (ii) the control light to the multiplex-hologram recording section so that the signal light having the spatial modes, the signal light having been multiplexed and inputted to the multiplex hologram recording section, is separated along paths of the control-light emitting section in respective directions of emission of the control light. 6. 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;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; anda phase conjugator for (i) amplifying light having passed through the multiplex-hologram recording section and (ii) returning the amplified light to the multiplex-hologram recording section,with use of the multiplex-hologram recording section, which includes holograms written therein by irradiation of the multiplex-hologram recording section with (i) light from the phase conjugator which light has a wave front identical to a wave front of a signal light beam having a particular spatial mode and (ii) the control light, the optical communication system causing holograms to be recorded in a multiplex manner by the control-light emitting section for emitting the control light to the multiplex-hologram recording section at the angles different from one another in correspondence with the respective spatial modes,after the recording, the optical communication system, when the multiplex-hologram recording section separates the signal light for a signal communication, emitting (i) the light from the phase conjugator which light has the wave front identical to the wave front of the signal light beam having the particular spatial mode and (ii) the control light to the multiplex-hologram recording section so that the signal light having the spatial modes, the signal light having been multiplexed and inputted to the multiplex hologram recording section, is separated along paths of the control-light emitting section in respective directions opposite to directions of emission of the control light. 7. The optical communication system according to claim 5, wherein:the optical communication system, when the multiplex-hologram recording section separates the signal light for a signal communication, first emits (i) the guide light which has the wave front identical to the wave front of the signal light beam having the particular spatial mode and (ii) the control light to the multiplex-hologram recording section so that the signal light having the spatial modes, the signal light having been multiplexed and inputted to the multiplex hologram recording section, is separated along the paths of the control-light emitting section in the respective directions of emission of the control light, and then emits (i) the guide light which has a wave front identical to a wave front of a signal light beam having a spatial mode different from the particular spatial mode and (ii) the control light to the multiplex-hologram recording section so that the signal light having the spatial modes, the signal light having been multiplexed and inputted to the multiplex hologram recording section, is separated along the paths of the control-light emitting section in the respective directions of emission of the control light. 8. The optical communication system according to claim 6, wherein:the optical communication system records, in the phase conjugator, a wave front of guide light which wave front is identical to a wave front of a signal light beam having a particular spatial mode;with use of the multiplex-hologram recording section, which includes holograms written therein by irradiation of the multiplex-hologram recording section with (i) the control light and (ii) the wave front recorded in the phase conjugator, the optical communication system, after the recording, causes holograms to be recorded in a multiplex manner by the control-light emitting section for emitting the control light to the multiplex-hologram recording section at the angles different from one another in correspondence with the respective spatial modes; andthe optical communication system, when the multiplex-hologram recording section separates the signal light for a signal communication, separates the signal light having the spatial modes, the signal light having been multiplexed and inputted to the multiplex hologram recording section, along the paths of the control-light emitting section in the respective directions opposite to the directions of emission of the control light. 9. The optical communication system according to claim 2, further comprising: a phase conjugator for (i) amplifying light having passed through the multiplex-hologram recording section and (ii) returning the amplified light to the multiplex-hologram recording section. 10. The optical communication system according to claim 2, wherein:the multiplex-hologram recording section is a photorefractive medium. 11. The optical communication system according to claim 3, wherein:the multiplex-hologram recording section is a photorefractive medium. 12. The optical communication system according to claim 4, wherein:the multiplex-hologram recording section is a photorefractive medium. 13. The optical communication system according to claim 6, wherein:the optical communication system, when the multiplex-hologram recording section separates the signal light for a signal communication, first emits (i) the guide light which has the wave front identical to the wave front of the signal light beam having the particular spatial mode and (ii) the control light to the multiplex-hologram recording section so that the signal light having the spatial modes, the signal light having been multiplexed and inputted to the multiplex hologram recording section, is separated along the paths of the control-light emitting section in the respective directions of emission of the control light, and then emits (i) the guide light which has a wave front identical to a wave front of a signal light beam having a spatial mode different from the particular spatial mode and (ii) the control light to the multiplex-hologram recording section so that the signal light having the spatial modes, the signal light having been multiplexed and inputted to the multiplex hologram recording section, is separated along the paths of the control-light emitting section in the respective directions of emission of the control light.
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이 특허에 인용된 특허 (1)
Anderson Dana Z. (Boulder CO) Saffman Mark E. (Boulder CO), Fiber optic communication method and apparatus providing mode multiplexing and holographic demultiplexing.
Shah, Aalap Rajendra, Apparatuses and methods for sound recording, manipulation, distribution and pressure wave creation through energy transfer between photons and media particles.
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