Patent ID: 11881900
Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Field: Telecommunications (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 6:
7. The spatial light frequency transmission system according to claim 6, wherein the frequency control unit causes the return signal light, to be incident on the photorefractive crystal, obtained by shifting the third frequency of the reference signal light emitted from the photorefractive crystal that is the phase-conjugate light of the guide light by the first double phase conjugate mirror, after reflection to be different from the first frequency of the reference signal light and the second frequency of the guide light, and
the second double phase conjugate mirror is formed in the photorefractive crystal by scattering of the return signal light and the reference signal light incident on the photorefractive crystal, and the return signal light is emitted to the transceiver on the other side from the photorefractive crystal as the phase-conjugate light of the reference signal light by the second double phase conjugate mirror.