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EP0408905A2
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Optical fiber telecommunication line comprising amplifiers of the transmitted signals and amplifiers for said line
Assignee: Pirelli and C SpA
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Filing: 1990-06-18
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Granted: —
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Expires: 2010-06-18
Abstract
Abstract An optical fiber telecommunication line according to the invention comprises active core optical fiber amplifiers of the transmitted signals. Two laser sources (19, 20) of pumping optical radiation are connected to each active core optical fiber present in the amplifiers of the line, one for each end of a single active core optical fiber. Of these two laser sources (19, 20) of pumping optical radiation the first one (19) is put into service and the second one (20) is kept as reserve to be put into service when the first one fails. Moreover the two pumping optical radiation sources (19, 20) are associated to a microprocessing circuit (29) able to oblige them to send alarm signals about the state of the amplifier to the terminal stations of the line and to received from these latter the control signals for the exchange of functioning between the two pumping optical radiation sources (19, 20).
Inventors
- 👤 Giorgio Grasso
- 👤 Aldo Righetti
- 👤 Flavio Fontana
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 17:41
CPC Classifications
H; H04; H04B; H04B10/00; H04B10/29; H04B10/291; H04B10/293; H04B10/2931; H04B10/03; H04B10/032; H04B10/07; H04B10/075; H04B10/077; H04B10/0775; H04B10/0777; H04B10/2912; H01; H01S; H01S3/00; H01S3/05; H01S3/06; H01S3/063; H01S3/067; H01S3/06754; H01S3/09; H01S3/091; H01S3/094; H01S3/09408; H04B2210/00; H04B2210/07; H04B2210/071; H04B2210/074; H04B2210/075
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
257 words
Optical fiber telecommunication line comprising at least a first and a second optical fiber cable (1, 2) arranged in series and connected together by means of an amplifier (6) for the transmitted signals, said amplifier (6) comprising, inside a tight envelope (12) which is connected to the facing ends of the optical fiber cables (1, 2), at least an active core optical fiber portion (16) whose ends are optically connected, to an optical fiber (13) of the first cable (1) and to an optical fiber (14) of the second cable (2) respectively, a first pumping optical radiation source (19), being connected to one of the two ends of the active core optical fiber portion (16), said line being characterized by the fact of providing at least at one of its ends a low frequency modulator of the optical radiation for the transmission of the signals, and by the fact that inside the amplifier (6) there are a second pumping optical radiation source (20), connected to the other end of the active core optical fiber portion (16), a microprocessing circuit (29) connected to the two ends of the active core optical fiber portion (16) which monitors the variations of intensity of the pumping optical radiation inside the active core optical fiber portion (16) and transmits signals which are function of said variations to a control circuit of at least a low frequency modulator (37) of the pumping optical sources (19, 20) and a working commutator (35) between the first (19) and the second (20) pumping optical radiation source.
Claim 2
Dependent Claim
257 words
Optical fiber telecommunication line comprising at least a first and a second optical fiber cable (1, 2) arranged in series and connected together by means of an amplifier (6) for the transmitted signals, said amplifier (6) comprising, inside a tight envelope (12) which is connected to the facing ends of the optical fiber cables (1, 2), at least an active core optical fiber portion (16) whose ends are optically connected, to an optical fiber (13) of the first cable (1) and to an optical fiber (14) of the second cable (2) respectively, a first pumping optical radiation source (19), being connected to one of the two ends of the active core optical fiber portion (16), said line being characterized by the fact of providing at least at one of its ends a low frequency modulator of the optical radiation for the transmission of the signals, and by the fact that inside the amplifier (6) there are a second pumping optical radiation source (20), connected to the other end of the active core optical fiber portion (16), a microprocessing circuit (29) connected to the two ends of the active core optical fiber portion (16) which monitors the variations of intensity of the pumping optical radiation inside the active core optical fiber portion (16) and transmits signals which are function of said variations to a control circuit of at least a low frequency modulator (37) of the pumping optical sources (19, 20) and a working commutator (35) between the first (19) and the second (20) pumping optical radiation source.
Claim 3
Dependent Claim
72 words
Line according to claim 1, characterized by the fact that inside the amplifier (6) at each end of the active core optical fiber portion (16) the connection of this latter with an optical fiber (13) of the cable (1), with the pumping optical radiation source (19) and with the circuit connected at the two ends of the active core optical fiber portion (16) is made by means of a dichroic coupler (17).
Claim 4
Dependent Claim
93 words
Line according to claim 1, formed by a plurality of optical fiber cables (1, 2, 3, 4, 5) arranged in series and connected together in pairs by amplifiers (6, 7, 8 and 9) of transmitted signals, characterized by the fact that the low frequency modulators (37, 37′) of the single amplifiers (6, 7, 8 and 9) cause low frequency modulations of the pumping energy different from one another and different from the low frequency modulation carried out at the end of the line of the optical source for the transmission of the signal.
Claim 5
Dependent Claim
199 words
Amplifier (6) for optical telecommunication lines comprising inside a tight envelope (12), which is connected to the ends of a first and a second optical fiber cable (1, 2), at least a portion (16) of active core optical fiber whose ends are optically connected to an optical fiber (13) of the first cable (1) and to an optical fiber (14) of the second cable (2), a first source (19) of pumping optical radiations being connected to one of the two ends of the active core optical fiber portion (16), said amplifier (6) being characterized by the fact of comprising a second source (20) of pumping optical radiation connected to the other end of the active core optical fiber portion (16), a microprocessing circuit (29) connected to the two ends of the active core optical fiber portion (16) which monitors the variations of intensity of the pumping optical radiations inside the active core optical fiber portion (16) and sends signals which are function of said variations to a control circuit of at least a low frequency modulator (37) of the pumping optical sources and a working commutator (35) between the first and the second pumping optical radiation source (19, 20).
Claim 6
Dependent Claim
199 words
Amplifier (6) for optical telecommunication lines comprising inside a tight envelope (12), which is connected to the ends of a first and a second optical fiber cable (1, 2), at least a portion (16) of active core optical fiber whose ends are optically connected to an optical fiber (13) of the first cable (1) and to an optical fiber (14) of the second cable (2), a first source (19) of pumping optical radiations being connected to one of the two ends of the active core optical fiber portion (16), said amplifier (6) being characterized by the fact of comprising a second source (20) of pumping optical radiation connected to the other end of the active core optical fiber portion (16), a microprocessing circuit (29) connected to the two ends of the active core optical fiber portion (16) which monitors the variations of intensity of the pumping optical radiations inside the active core optical fiber portion (16) and sends signals which are function of said variations to a control circuit of at least a low frequency modulator (37) of the pumping optical sources and a working commutator (35) between the first and the second pumping optical radiation source (19, 20).
Claim 7
Dependent Claim
74 words
Amplifier (6) according to claim 4, characterized by the fact that at each end of the active core optical fiber portion (16) the connection of this latter with an optical fiber (13, 14) of the cable (3, 2), with the pumping optical radiation source (19, 20) and with the circuit connected to the two ends of the active core optical fiber portion (16) is carried out by means of a dichroic coupler (17, 18).
References Cited (Backward Citations)
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