EP0409012A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Unit for amplifying light signals in optical fiber transmission lines
Assignee: Cisco Systems International BV
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Filing: 1990-07-06
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Granted: —
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Expires: 2010-07-06
Abstract
Abstract It is disclosed a unit for amplifying light signals in optical fiber transmission lines, comprising a fiber optical amplifier (2) to which light signals are transmitted through an input optical fiber line (3), and from which said signals, after having been amplified, are introduced into an output optical fiber line (5), first and second optical insulators (7, 8) being interposed between the fiber optical amplifier (2) and the input and output lines (3, 5) to prevent the transmission of noise optical signals from the input and output lines to the amplifier.
Inventors
- 👤 Giorgio Grasso
- 👤 Aldo Righetti
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 12:21
CPC Classifications
H; H04; H04B; H04B10/00; H04B10/29; H04B10/291; H04B10/2912; G; G02; G02B; G02B6/00; G02B6/24; G02B6/42; G02B6/4201; G02B6/4204; G02B6/4207; G02B6/4208; H01; H01S; H01S3/00; H01S3/005; H01S3/0064; H01S3/05; H01S3/06; H01S3/063; H01S3/067; H01S3/06754; H01S2301/00; H01S2301/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
185 words
Unit for amplifying light signals in optical fiber transmission lines, comprising a fiber optical amplifier (2) arranged to be connected in use to at least an input optical fiber line (3) through which light signals are transmitted to the amplifier and to at least an output optical fiber line (5) into which the light signals amplified by said fiber optical amplifier are introduced, characterised by the fact of comprising first means for unidirectional selection (7) interposed between said amplifier (2) and the output optical fiber line (5) to prevent the transmission of optical signals of noise from said output line to the amplifier, and second means for unidirectional selection (8) interposed between the amplifier (2) and the input line (3) to prevent the transmission of noise signals from the amplifier to said input line, said first and second selection means (7, 8) comprising at least a first optical insulator and at least a second optical insulator, respectively, said optical insulators (7, 8) having a reflectivity lower of at least 10 dB than the Rayleigh scattering of the optical fibres forming said input and output lines.
Claim 2
Dependent Claim
185 words
Unit for amplifying light signals in optical fiber transmission lines, comprising a fiber optical amplifier (2) arranged to be connected in use to at least an input optical fiber line (3) through which light signals are transmitted to the amplifier and to at least an output optical fiber line (5) into which the light signals amplified by said fiber optical amplifier are introduced, characterised by the fact of comprising first means for unidirectional selection (7) interposed between said amplifier (2) and the output optical fiber line (5) to prevent the transmission of optical signals of noise from said output line to the amplifier, and second means for unidirectional selection (8) interposed between the amplifier (2) and the input line (3) to prevent the transmission of noise signals from the amplifier to said input line, said first and second selection means (7, 8) comprising at least a first optical insulator and at least a second optical insulator, respectively, said optical insulators (7, 8) having a reflectivity lower of at least 10 dB than the Rayleigh scattering of the optical fibres forming said input and output lines.
References Cited (Backward Citations)
EP0112090A2
Cited
WO1986007221A1
Cited
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