Patent ID: 11888281
Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Field: Optics (Instruments)
Classification: CPC H | IPC H

Claim 1:
2. The multimode optical amplifier according to claim 1, wherein the amplifying fiber is such that
the predetermined plurality of propagation modes of the excitation light is an LP0n mode (n is an integer of 2 or more), an LPmm′ mode (m is an integer of 2 or more, and m′ is an integer of 1 or more), or a part of a mixed mode in which in which they are mixed;
when the predetermined plurality of propagation modes of the excitation light propagates in the core of the amplifying fiber,
in a cross section of the core of the amplifying fiber, a light emitting center doped with erbium in the core of the amplifying fiber is uniformly excited.