公开(公告)号：JPH02211681A

公开(公告)日：1990-08-22

申请号：JP29379489

申请日：1989-11-10

Applicant: COMP GENERALE ELECTRICITE

Inventor： ERUBE FUEBURIE ,  JIYOJIANU RAMO ,  JIYATSUKU OUJIYU ,  JIYANNFURANSOWA MARUSEROO ,  BERUNAARU JIYATSUKIE ,  JIYANNKUROODO GAKON

IPC: G02B6/00 ,  C03B37/018 ,  C03C4/12 ,  C03C13/04 ,  G02F1/35 ,  H01L27/15 ,  H01S3/06 ,  H01S3/067 ,  H01S3/17

Abstract: PURPOSE: To obtain a fiber-optical laser amplifier which has a large gain at a given pumping output and can yield a larger process efficiency by doping the optical fiber of the amplifier with erbium. CONSTITUTION: An optical signal S having a wavelength λs and a pumping signal P having a wavelength λb at the entrance of an amplifier 1 are introduced to the entrance of a doped fiber 3 for amplification through a coupler 2. At the exit of the amplifier 1, a signal S' having an amplified wavelength λs is obtained. Although the fiber 3 is doped with erbium, the doping amount of the fiber 3 is 5-50ppm and the length of the fiber 3 is adjusted to 250-30m in accordance with the selected doping amount so that substantial conformity can be obtained between the doped zone in the radial direction and the maximum energy of the whole fiber 3 in the propagation mode of the pumping wavelength.