05436760 is referenced by 84 patents and cites 7 patents.

An optical fiber amplifier includes an optical amplifying section having an Er-doped fiber. A gain equalizing section is provided at secondary stage of the optical amplifying section and has an optical filter unit for compensating for wavelength dependency characteristics of a signal gain at the optical amplifying section. The gain equalizing section has a filter rotating device and the optical filter unit has et least two optical filters of transparent multi-layer film in which a layer of high refractive index and a layer of low refractive index are alternately and repeatedly stacked. The optical filter is rotated by the filter rotating device such that the wavelength transmission characteristics of the optical filter are set by changing an angle of incidence of the signal light with respect to the optical filter and the wavelength dependency characteristics of the signal gain are compensated for. The optical filter which is of the multi-layer film and which is rotatably arranged improves wavelength tunability.

Title
Optical fiber amplifier with gain equalizing circuit
Application Number
8/273137
Publication Number
5436760
Application Date
July 14, 1994
Publication Date
July 25, 1995
Inventor
Yukinobu Nakabayashi
Tokyo
JP
Agent
Sughrue Mion Zinn Macpeak & Seas
Assignee
NEC Corporation
JP
IPC
H01S 3/00
G02F 1/35
H04B 10/17
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