WO2008068842A1 - Répéteur optique pour système de câbles optiques sous-marin et système de câbles optiques sous-marin équipé de celui-ci - Google Patents

Répéteur optique pour système de câbles optiques sous-marin et système de câbles optiques sous-marin équipé de celui-ci Download PDF

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Publication number
WO2008068842A1
WO2008068842A1 PCT/JP2006/324222 JP2006324222W WO2008068842A1 WO 2008068842 A1 WO2008068842 A1 WO 2008068842A1 JP 2006324222 W JP2006324222 W JP 2006324222W WO 2008068842 A1 WO2008068842 A1 WO 2008068842A1
Authority
WO
WIPO (PCT)
Prior art keywords
optical
pump laser
current
submarine cable
repeater
Prior art date
Application number
PCT/JP2006/324222
Other languages
English (en)
Japanese (ja)
Inventor
Koji Ono
Koji Goto
Original Assignee
Kddi Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kddi Corporation filed Critical Kddi Corporation
Priority to JP2008548130A priority Critical patent/JP4983804B2/ja
Priority to PCT/JP2006/324222 priority patent/WO2008068842A1/fr
Publication of WO2008068842A1 publication Critical patent/WO2008068842A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/80—Optical aspects relating to the use of optical transmission for specific applications, not provided for in groups H04B10/03 - H04B10/70, e.g. optical power feeding or optical transmission through water
    • H04B10/806—Arrangements for feeding power
    • H04B10/808—Electrical power feeding of an optical transmission system

Definitions

  • optical repeater of optical submarine cable system and optical submarine Cape Nore system including the optical repeater
  • the present invention relates to an optical repeater of an optical submarine cable system and an optical submarine cable system including the optical repeater. More specifically, the present invention relates to an optical repeater of an optical submarine cable system and a power feeding method of an optical submarine cable system including the optical repeater.
  • An optical submarine cable system includes an optical fiber that propagates an optical signal carrying data, an optical repeater that relays the optical signal, and an internal conductor that energizes a feeding current for driving the optical repeater.
  • the optical signal transmitted from the land transmission device is relayed using the optical repeater, and the digital data is transmitted by receiving it at the opposite land transmission device.
  • an optical repeater feeding system used in an optical submarine cable system generally, a direct-current voltage having a positive or negative polarity is applied to each optical submarine cable from the opposite land station. As a result, a direct current is supplied to the optical submarine cable system.
  • the optical amplifier in the optical repeater is driven using the DC voltage generated across the resistor in the power circuit.
  • FIG. 1 is a conceptual diagram of an optical submarine cable system.
  • a power supply device 3 is installed at each opposing land station, and a direct current is applied to an optical submarine cable system including a plurality of optical repeaters 2.
  • the current circulates in a closed circuit between the inner conductor of the optical submarine cable and seawater.
  • the DC current to be fed is controlled by the potential difference between both feeding devices 3.
  • FIG. 2 is a schematic configuration diagram of the optical repeater 2.
  • the power supply circuit 5 for obtaining a DC voltage from the current applied to the optical submarine cable and one or a plurality of optical amplifiers 4 for amplifying / relaying the optical fiber signal are loaded inside.
  • the optical amplifier 4 is an erbium-doped fiber 8 that directly amplifies signal light transmitted through the optical submarine cable system, and pumps it with pump light to generate an optical amplification effect.
  • the pump laser 7 has a plurality of redundant configurations because the influence on the signal light transmission quality is affected by the design of the system even if a part of the laser element with relatively low reliability of the laser element fails. This is to make it within an allowable range.
  • Non-Patent Document 1 Noboru Oyama / Moji Kuwahara “Optical Submarine Cable Communication”, KDDI Engineering and consulting (1991)
  • Non-Patent Document 2 Akiba / Nishi “Submarine Cable Networks Systems”, N'Ti'Ti Qoris (2001)
  • the present invention provides an optical repeater that is unlikely to be completely disconnected even when the power supply current is reduced due to a cable ground failure or the like, and the communication can be completely disconnected by including the optical repeater.
  • An object is to provide an optical submarine cable system with low performance.
  • an optical repeater of an optical submarine cable system is applied from a plurality of pump lasers for amplifying signal light transmitted from a land transmission device and a station on land.
  • a power supply circuit for supplying current to the pump laser using a direct current supply current as a power source, pump laser power saving means for stopping supply of current to some pump lasers as the power supply current decreases, including.
  • the optical repeater of the optical submarine cable system according to the present invention further includes a plurality of optical amplifiers, each pump laser belongs to one of the optical amplifiers, and the pump laser power saving means includes a reduction in power supply current. Accordingly, it is preferable to stop supplying current to all pump lasers of some optical amplifiers.
  • the power supply circuit further includes a resistor for generating a voltage for supplying a current to the pump laser at both ends, each pump laser is connected to the both ends of the resistor, and the pump laser power saving means includes one It is preferable to cut the resistance of the pump laser of the part.
  • the pump laser power saving means preferably further reduces the resistance value of a resistor that generates a voltage at both ends for supplying a current to the pump laser in the power supply circuit.
  • an optical submarine cable system according to the present invention includes the optical repeater described above.
  • an optical repeater for an optical submarine cable is connected to a part of a plurality of optical amplifiers provided in the optical repeater when a direct current supplied from a land station is reduced.
  • a power supply circuit that stops power supply is provided.
  • Sarako in the same case, in the optical amplifier Are equipped with a power supply circuit that stops power supply to some of the pump lasers. This makes it possible to realize an optical submarine cable system with a low possibility of disrupting some or all communications even when the power supply current to the optical repeater is reduced due to a cable ground fault or the like.
  • FIG. 1 is a conceptual diagram of an optical amplifying submarine cable system.
  • FIG. 2 is a schematic configuration diagram of an optical repeater.
  • FIG. 3 Conceptual diagram of the power feeding method of the optical submarine cable system, (a) is a normal power feeding state, (b) is a state where a cable ground fault has occurred, and (c) is a power feeding device feeding power. The voltage is adjusted.
  • the power feeding device is in a state where the power feeding voltage cannot be adjusted.
  • FIG. 5 is a schematic configuration diagram of an optical repeater in an embodiment in which some pump lasers according to the present invention are stopped.
  • FIG. 6 is a schematic diagram of the configuration of an optical repeater in an embodiment in which some optical amplifiers according to the present invention are stopped.
  • FIG. 7 is a schematic configuration diagram of an optical repeater in an embodiment in which some optical amplifiers according to the present invention are stopped and power feeding resistance is reduced.
  • FIG. 5 is a schematic configuration diagram of the optical repeater according to the first embodiment of the present invention.
  • the optical repeater 2 includes an optical amplifier 4 and a power supply circuit 5. Furthermore, the optical amplifier 4 includes an erbium-doped fiber 8 that directly amplifies signal light, two pump lasers 71 and 72 that generate optical amplification by pumping it with pump light, and an LD for driving the pump laser. The drive circuits 61 and 62 and the force are also configured.
  • the power supply circuit 5 includes resistors 92 and 93 for supplying a DC voltage to the LD drive circuits 61 and 62, a pump laser power saving means 12, and a force.
  • the pump laser power saving means 12 includes a resistor 91 for the relay coil, a relay coil 10, and a relay SW11.
  • the relay SW11 During normal operation, that is, when the necessary feeding current is supplied, the relay SW11 is connected to the a terminal. For this reason, the LD drive circuit 61 drives the pump laser 71 by a DC voltage generated across the resistor 92, and the LD drive circuit 62 drives the pump laser 72 by a DC voltage generated across the resistor 93, and the optical amplifier. 4 generates an optical amplification effect.
  • the pump laser power saving means 12 operates as follows. First, as the voltage of the resistor 91 decreases, the relay coil 10 operates, and the relay SW11 switches the a terminal force to the b terminal and is connected to the b terminal. As a result, the LD drive circuit 62 is disconnected from the resistor 93, and the power supply to the LD drive circuit 62 is stopped. On the other hand, the LD driving circuit 61 receives a DC voltage generated across the resistor 92 and the resistor 93, and the supply voltage to the LD driving circuit 61 is doubled.
  • the LD drive circuit 61 causes the pump laser to be reduced. 71 can be driven. That is, when the pump laser 71 and the pump laser 72 cannot be driven due to a decrease in the supply voltage, the voltage of the LD drive circuit 62 is supplied to the LD drive circuit 61 to maintain the drive of the pump laser 71. ing.
  • the optical amplifier is designed so that the optical output of the optical amplifier is maintained to some extent even if the total input power of the pump laser power is slightly reduced, so that communication is maintained.
  • FIG. 6 is a schematic configuration diagram of an optical repeater according to the second embodiment of the present invention.
  • the optical repeater 2 includes optical amplifiers 41 and 42 and a power supply circuit 5.
  • the optical amplifiers 41 and 42 are erbium-doped fibers (not shown) that directly amplify signal light, respectively, and two pump lasers 71 and 72 that generate optical amplification by pumping it with pump light.
  • LD drive circuits 61 and 62 for driving the pump laser.
  • the power supply circuit 5 also includes resistors 92 and 93 for supplying a direct current voltage to the LD drive circuits 61 and 62, pump laser power saving means 12, and power.
  • the pump laser power saving means 12 includes a resistor 91 for the relay coil, a relay coil 10, and a relay SW 11, and a force.
  • the relay SW11 In a normal state, that is, when a necessary feeding current is supplied, the relay SW11 is connected to the a terminal. For this reason, the LD drive circuit 61 drives the pump laser 71 by a DC voltage generated across the resistor 92, and the LD drive circuit 62 drives the pump laser 72 by a DC voltage generated across the resistor 93, and the optical amplifier. 41 and 42 generate optical amplification.
  • the pump laser power saving means 12 operates as follows. First, as the voltage of the resistor 91 decreases, the relay coil 10 operates, and the relay SW11 switches the a terminal force to the b terminal and is connected to the b terminal. As a result, the LD drive circuit 62 is disconnected from the resistor 93, and the power supply to the LD drive circuit 62 is stopped. On the other hand, the LD driving circuit 61 receives a DC voltage generated across the resistor 92 and the resistor 93, and the supply voltage to the LD driving circuit 61 is doubled.
  • the LD drive circuit 61 causes the pump laser to be reduced. 71 can be driven. At this time, since the optical amplifier 42 cannot drive the pump laser 72, the optical amplification function cannot be performed. However, the optical amplifier 41 is The amplifier laser 71 can be driven, and an optical amplification function can be performed. In other words, when the functions of both the optical amplifier 41 and the optical amplifier 42 are stopped due to a decrease in the supply voltage, the power of the optical amplifier 42 is supplied to the optical amplifier 41 to maintain the function of the optical amplifier 41. Yes. As a result, it is possible to maintain communication of the fiber pair on one side.
  • FIG. 7 is a schematic configuration diagram of an optical repeater according to the third embodiment of the present invention.
  • the optical repeater 2 includes an optical amplifier 4 and a power supply circuit 5.
  • the optical amplifier 4 includes an erbium-doped fiber 8 that directly amplifies signal light, two pump lasers 71 and 72 that generate pumping light by pumping it with pump light, and a pump laser.
  • LD drive circuits 61 and 62 for driving, and force are also configured.
  • the power supply circuit 5 is composed of resistors 92 and 93 for supplying power to the LD drive circuits 61 and 62 and pump laser power saving means 12.
  • the pump laser power saving means 12 includes a resistor 91 for a relay coil, a resistor 94 connected in parallel to the resistor 93, a relay coil 10, and a relay SW11.
  • the pump laser power saving means 12 operates as follows. First, as the voltage of resistor 91 decreases, relay coil 10 operates, and relay SW11 switches the a terminal force to the b terminal, and the c terminal force also switches to the d terminal. Will be connected to. As a result, the LD drive circuit 62 is disconnected from the resistor 93 and the power supply is stopped. On the other hand, the LD drive circuit 61 receives a DC voltage generated across the resistors 92, 93, and 94, and the supply voltage to the LD drive circuit 61 increases.
  • the relay SW11 is connected to the d terminal.
  • the resistor 94 is connected in parallel to the resistor 93 of the power supply path. Since the resistor 94 and the resistor 93 are connected in parallel, the resistance value of the entire power supply path is reduced. As a result, the current of the entire power supply path is slightly recovered, and the possibility that communication can be maintained is increased as compared with the case of the first embodiment.
  • the number of optical amplifiers in the optical repeater, the number of pump lasers in the optical amplifier, and the number of LD drive circuits in this embodiment are merely examples, and the present invention is not limited to this example.
  • a configuration in which four optical amplifiers are provided in the optical repeater or a configuration in which four pump lasers are provided in the optical amplifier is also conceivable.
  • the pump laser power saving means is provided inside the power supply circuit.
  • the pump laser power saving means need not be provided inside the power supply circuit.
  • An embodiment in which the pump laser power saving means is provided inside the optical amplifier and an embodiment in which the pump laser power saving means is provided outside the optical amplifier in addition to the power supply circuit are also conceivable.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optical Communication System (AREA)
  • Lasers (AREA)

Abstract

L'invention concerne un répéteur optique permettant de minimiser le risque de coupure complète des communications en dépit d'une réduction d'un courant d'alimentation. L'invention concerne également un système de câbles optiques sous-marin équipé d'un tel répéteur optique aux fins d'en minimiser le risque de coupure complète des communications. L'invention concerne en particulier un répéteur optique permettant d'empêcher la rupture partielle ou complète des communications en dépit d'une réduction du courant d'alimentation grâce à l'interruption de l'alimentation d'une partie d'une pluralité d'amplificateurs optiques montés dans le répéteur optique et/ou d'une partie d'une pluralité de lasers de pompage montés dans les amplificateurs optiques ; ainsi qu'un système de câbles optiques sous-marin équipé d'un tel répéteur.
PCT/JP2006/324222 2006-12-05 2006-12-05 Répéteur optique pour système de câbles optiques sous-marin et système de câbles optiques sous-marin équipé de celui-ci WO2008068842A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2008548130A JP4983804B2 (ja) 2006-12-05 2006-12-05 光海底ケーブルシステムの光中継器および該光中継器を備える光海底ケーブルシステム
PCT/JP2006/324222 WO2008068842A1 (fr) 2006-12-05 2006-12-05 Répéteur optique pour système de câbles optiques sous-marin et système de câbles optiques sous-marin équipé de celui-ci

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2006/324222 WO2008068842A1 (fr) 2006-12-05 2006-12-05 Répéteur optique pour système de câbles optiques sous-marin et système de câbles optiques sous-marin équipé de celui-ci

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WO2008068842A1 true WO2008068842A1 (fr) 2008-06-12

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JP (1) JP4983804B2 (fr)
WO (1) WO2008068842A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013529037A (ja) * 2010-06-03 2013-07-11 アルカテル−ルーセント 海水下で電力を輸送し、光ファイバ通信を提供するためのシステムおよび方法
CN110383717A (zh) * 2017-03-17 2019-10-25 日本电气株式会社 光海底线缆系统和光海底中继设备
JP2021191020A (ja) * 2020-05-25 2021-12-13 Kddi株式会社 光中継器及び光海底ケーブルシステム

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5742244A (en) * 1980-08-28 1982-03-09 Fujitsu Ltd Optical transmission system
JPH02272834A (ja) * 1989-04-13 1990-11-07 Nec Corp 光海底中継器
JPH0738471A (ja) * 1993-07-23 1995-02-07 Fujitsu Ltd 光アンプ中継器の利得制御方式
WO1999040695A1 (fr) * 1998-02-06 1999-08-12 Fujitsu Limited Amplificateur optique, procede de commande de la source de lumiere d'excitation dans un amplificateur optique et procede de commande de l'amplificateur optique

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69929934T2 (de) * 1998-12-31 2006-08-10 Cisco Systems International B.V. Automatisches Schutzsystem für ein optisches Übertragungssystem

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5742244A (en) * 1980-08-28 1982-03-09 Fujitsu Ltd Optical transmission system
JPH02272834A (ja) * 1989-04-13 1990-11-07 Nec Corp 光海底中継器
JPH0738471A (ja) * 1993-07-23 1995-02-07 Fujitsu Ltd 光アンプ中継器の利得制御方式
WO1999040695A1 (fr) * 1998-02-06 1999-08-12 Fujitsu Limited Amplificateur optique, procede de commande de la source de lumiere d'excitation dans un amplificateur optique et procede de commande de l'amplificateur optique

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013529037A (ja) * 2010-06-03 2013-07-11 アルカテル−ルーセント 海水下で電力を輸送し、光ファイバ通信を提供するためのシステムおよび方法
CN110383717A (zh) * 2017-03-17 2019-10-25 日本电气株式会社 光海底线缆系统和光海底中继设备
US11223427B2 (en) 2017-03-17 2022-01-11 Nec Corporation Optical submarine cable system and optical submarine relay apparatus
CN110383717B (zh) * 2017-03-17 2022-10-25 日本电气株式会社 光海底线缆系统和光海底中继设备
JP2021191020A (ja) * 2020-05-25 2021-12-13 Kddi株式会社 光中継器及び光海底ケーブルシステム
JP7301788B2 (ja) 2020-05-25 2023-07-03 Kddi株式会社 光中継器及び光海底ケーブルシステム

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JP4983804B2 (ja) 2012-07-25
JPWO2008068842A1 (ja) 2010-03-11

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