Optical: systems and elements – Optical amplifier – Optical fiber
Patent
1994-07-14
1995-07-25
Moskowitz, Nelson
Optical: systems and elements
Optical amplifier
Optical fiber
359132, 359589, H04B 1017, G02F 135, H01S 300
Patent
active
054367603
ABSTRACT:
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.
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patent: 5214494 (1993-05-01), Inaba et al.
patent: 5225922 (1993-07-01), Chraplyvy et al.
patent: 5231529 (1993-07-01), Kaede
patent: 5276543 (1994-01-01), Olshansky
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"A 100-Channel Optical FDM Six-Stage In-Line Amplifier System Employing Tunable Gain Equalizers" by Hiromu Toba et al., IEEE Photonics Technology Letters, vol. 5, No. 2, Feb. 1993 pp. 248-251.
"Impact of the Er-doped fiber amplifier on optical communication by the Er-doped fiber amplifier" by S. Shimada, O plus E, 113, Apr. 1989, pp. 75-81.
"A 212 km Non-Repeated Transmission Experiment at 1.8 Gb/s Using LD Pumped ER.sup.3 +Doped Fiber Amplifiers in a IM/Direct Detection Repeater System", by K. Hagimoto et al., NTT Transmission Systems Laboratories, PD15-1-PD.ident.-4.
Moskowitz Nelson
NEC Corporation
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