Patent Number:
6,167,181
Title:
Optical fiber light amplifier
Abstract:
An erbium-doped optical fiber for amplifying a light signal 1 is wound to form a plurality of nearly-closed rings 1a that are arranged in a flat expanded configuration. A light-receiving device 4 receives a spontaneous emission light emitted by the entirety of erbium-doped optical fiber 1 and supplies an electric signal corresponding to the received spontaneous emission light. A laser diode 2 supplies a pumping light to the erbium-doped optical fiber 1 to create a population inversion in the erbium-doped optical fiber. An output-control device 3 controls an output of laser diode 2 in response to the electric signal supplied from the light-receiving device 4. The light-receiving device 4 is located so that the light-receiving device can receive the spontaneous emission light emitted from the entirety of the rings 1a.
Inventors:
Fukaishi; Kosuke (Tokyo, JP)
Assignee:
NEC Corporation
International Classification:
H01S 3/067 (20060101); H01S 3/13 (20060101); H01S 3/06 (20060101); H01S 3/131 (20060101); G02B 006/02 ()
Expiration Date:
12/26/2017