EP0440276A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Optical fibre telecommunications line with separate service channels
Assignee: Pirelli and C SpA
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Filing: 1991-01-15
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Granted: —
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Expires: 2011-01-15
Abstract
Abstract The invention refers to an optical fibre transmission line which comprises means (9, 10) for injecting and means (9, 10) for extracting optical service signals from the line' s optical fibre (3), where said means comprise emission and/or reception units (10) of optical service signals, suitable for receiving from the optical line (3) and/or emitting towards the line itself service signals in the form of optical signals having a wavelength which is substantially different from the wavelength of the telecommunications signals, each of which units (10) is associated with a corresponding optical coupler (9) inserted along the line (3), suitable for coupling within the line fibre and/or for extracting from it the optical service signals.
Inventors
- 👤 Giorgio Grasso
- 👤 Mario Tamburello
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 00:14
CPC Classifications
H; H04; H04B; H04B10/00; H04B10/25; H04B10/29; H04B10/291; H04B10/07; H04B10/075; H04B10/077; H04B10/0777; H04J; H04J14/00; H04J14/02; H04J14/0226; H04J14/0227; H04J14/0241; H04J14/0242; H04J14/0245; H04J14/0246; H04J14/0249; H04J14/025; H04J14/0278; H04J14/028; H04B2210/00; H04B2210/07; H04B2210/078
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
178 words
Optical fibre transmission line, comprising at least one emission station (1) and one reception station (4) of telecommunications signals and at least one optical amplifier (6, 8), characterized in that it comprises means (9, 10) for injecting and means (9, 10) for extracting optical service signals from the line' s optical fibre (3), where said means comprise at least one emission and/or reception unit (10) of optical service signals, suitable for receiving from the optical line and/or emitting towards the same service signals, constituted by communication or control signals electrically supplied by or taken from the unit itself, in the form of optical signals having a wavelength which is substantially different from the wavelength of the telecommunications signals, where said unit (10) is associated with a corresponding optical coupler (9) inserted along the line, suitable for coupling within the line fibre (3) and/or for extracting from it the optical service signals, with the optical amplifier (6, 8) or with each optical amplifier there being associated at least one means (9, 10) for injecting or extracting optical service signals.
Claim 2
Dependent Claim
55 words
Optical fibre transmission line according to claim 1, characterized in that the optical amplifier (6, 8) or each optical amplifier is associated with a means (9, 10) for injecting and with a means (9, 10) for extracting optical service signals, suitable for switching the service signals themselves along a path external to the amplifier (8).
Claim 3
Dependent Claim
48 words
Optical fibre transmission line according to claim 1, characterized in that the wavelength of the service signals is substantially equal to or differs only slightly from the wavelength corresponding to a minimum of the attenuation curve of the light in the optical fibre in relation to the wavelength.
Claim 4
Dependent Claim
50 words
Optical fibre transmission line according to claim 1, characterized in that the wavelength of the telecommunications signals ranges substantially from 1500 to 1600 nm and the wavelength of the service signals ranges from 1200 to 1400 nm, said service signals being transmitted at a rate substantially lower than 300 Kbit/sec.
Claim 5
Dependent Claim
22 words
Optical fibre transmission line according to claim 1, characterized in that the optical couplers (9) are constituted by by dichroic fibre couplers.
Claim 6
Dependent Claim
114 words
Optical fibre transmission line according to claim 2, characterized in that the line optical amplifier (6, 8) or amplifiers are constituted by sections of active fibre (12), doped with fluorescent substances and by means (14) for injecting into the sections of active fibre (12) luminous pumping energy, having a wavelength different from the telecommunications wavelength, generated by respective pumping lasers (13), there being present at at least one amplifier a reception unit (10) and an emission unit (10) of service optical signals and corresponding optical couplers (9) inserted along the line fibre (3), upstream and downstream from the optical amplifier (8), respectively, in the direction in which the service signals are to be sent.
Claim 7
Dependent Claim
78 words
Optical fibre transmission line according to claim 6, characterized in that the reception and emission units (10) are connected together electrically, with the possible interposition of electronic amplification means (11), said units being suitable for receiving optical service signals from the line (3), for transforming them into electrical signals, for amplifying them electronically and respectively for receiving the amplified electrical signals, for converting them into optical signals at the service wavelength and for sending them along the line.
Claim 8
Dependent Claim
42 words
Optical fibre transmission line according to claim 6, characterized in that the reception and emission units (10) of the service signals comprise means for the control and command of the amplifier' s pumping laser or lasers (13), driven by the service signals.
Claim 9
Dependent Claim
51 words
Optical fibre transmission line according to claim 6, characterized in that the means (15) for injecting luminous pumping energy into the active fibre sections of at least one optical amplifier and one optical coupler of the service signals at the amplifier itself are constituted by a single three-wavelength optical coupler (15).
References Cited (Backward Citations)
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