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

Claim 0:
1. A transceiver comprising:
a guide light source configured to emit guide light;
a photorefractive crystal where a first double phase conjugate mirror is formed by scattering of reference signal light and the guide light, the reference signal light having a first frequency different from a second frequency of the guide light and being incident on the photorefractive crystal via space after being transmitted from a transceiver on another side, the guide light being incident on the photorefractive crystal in a reverse direction to a direction of the reference signal light; and
a frequency control unit configured to couple the reference signal light being phase-conjugate light of the guide light by the first double phase conjugate mirror emitted from the photorefractive crystal, to an optical fiber.