WO2006009133A1 - Cable de transmission optique pour communication optique, procede de fabrication de celui-ci et dispositif de transmission de communication optique - Google Patents

Cable de transmission optique pour communication optique, procede de fabrication de celui-ci et dispositif de transmission de communication optique Download PDF

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Publication number
WO2006009133A1
WO2006009133A1 PCT/JP2005/013232 JP2005013232W WO2006009133A1 WO 2006009133 A1 WO2006009133 A1 WO 2006009133A1 JP 2005013232 W JP2005013232 W JP 2005013232W WO 2006009133 A1 WO2006009133 A1 WO 2006009133A1
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WO
WIPO (PCT)
Prior art keywords
optical
transmission line
signal light
optical fiber
transmission
Prior art date
Application number
PCT/JP2005/013232
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English (en)
Japanese (ja)
Inventor
Toshiharu Ito
Original Assignee
Nec 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 Nec Corporation filed Critical Nec Corporation
Priority to JP2006529217A priority Critical patent/JP4894516B2/ja
Publication of WO2006009133A1 publication Critical patent/WO2006009133A1/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
    • H04B10/29—Repeaters
    • H04B10/291—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form
    • H04B10/298—Two-way repeaters, i.e. repeaters amplifying separate upward and downward lines
    • 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
    • H04B10/25—Arrangements specific to fibre transmission
    • H04B10/2589—Bidirectional transmission

Definitions

  • Optical transmission cable for optical communication method for manufacturing the same, and optical communication transmission apparatus
  • the present invention relates to an optical transmission line for optical communication and an optical communication transmission apparatus, and more particularly to an optical transmission cable and an optical communication transmission apparatus suitable for long-distance and large-capacity transmission.
  • the chromatic dispersion and dispersion slope having the opposite characteristics are realized in the form of an optical fiber that can also be used as a transmission line optical fiber, and can be used in combination with a basic transmission line optical fiber.
  • a transmission line that enables management of accumulated dispersion over the wavelength band is called a “dispersion flat transmission line” or “dispersion management transmission line”.
  • Non-Patent Document 1 Since the publication of Non-Patent Document 1, the distributed flat transmission line is considered to be one of the most important technologies in a long-distance large-capacity wavelength division multiplexing optical transmission system.
  • a dispersion flat transmission line is basically as shown in Fig. 2, in which each span (between each relay amplifier) is connected by a pair of positive dispersion optical fiber and negative dispersion optical fiber. Each time, the amount of accumulated dispersion that remains is at or near zero.
  • a nonlinear effect in which the signal light intensity is high is high.
  • a low nonlinearity, positive dispersion optical fiber 10 is provided in the first half of the span.
  • the signal light intensity is low due to attenuation when passing through the positive dispersion fiber.
  • a negative dispersion optical fiber 11 with relatively high nonlinearity is arranged in the second half.
  • the chromatic dispersion power of the negative dispersion optical fiber is 20 [psZnm. Km]
  • the same distance is required for each of the positive dispersion and the negative dispersion optical fiber in order to make the accumulated dispersion amount zero in each span. If the span length is 60km, it will be 30km each.
  • the optical transmission cable 15 needs to accommodate two types of transmission lines 30 and 31 having different directivities for an uplink (rightward in the figure) and a downlink (leftward in the figure).
  • the right direction and the left direction refer to directions in the drawing.
  • the amplifiers 21 and 22 in both directions are accommodated in the same housing 25. Therefore, if a distributed flat transmission line is used, the optical transmission cable 15 has
  • the optical transmission cable • a cable that accommodates only positive dispersion optical fiber
  • the transmission path has directionality like the cable in Fig. 3.
  • the configuration shown in Fig. 4 that can handle this signal transmission has great operational advantages.
  • Non-Patent Document 1 M. Murakami, T. Matsuda and T. Imai; Quarter terabit (25 X 10Gbit / s) over9, 288km WDM transmission experiment using non-linear supported RZinstall e inhigher order fiber dispersion managed line, Proceeding of ECOC'98 (1998), Vol. 3- P77.
  • Non-Patent Document 2 Itsuro Morita, Keiji Tanaka, Noboru Edagawa, Masatoshi SUZU U 40Gbit x 16 WDM transmission over 2000km using dispersion managed low—nonlinea r fiber span, 26th European Conference on Optical Communication (ECOC2000), paper- 10.1.5, vol.4, pp.25- 28.
  • ECOC2000 European Conference on Optical Communication
  • Patent Document 1 JP-A-6-204949 (Fig. 1)
  • an object of the present invention is to provide an optical transmission line, an optical communication transmission apparatus, and an optical transmission cable manufacturing method using a distributed flat transmission line capable of transmitting a large capacity signal per core. .
  • An optical transmission line accommodates a signal light transmission line having a transmission direction in a first direction and a second direction opposite to the first direction.
  • An optical transmission cable that contains one type of transmission line optical fiber and two types of transmission line optical fibers that have different characteristics. Transmission cables are alternately connected via a casing that houses the repeater optical amplifier, and the first casing is disposed on one end side of the one kind of transmission line optical fiber with respect to the first direction.
  • the signal light transmission line in the first direction has a repeater optical amplifier, and the signal light transmission line in the second direction is formed by directly connecting transmission line optical fibers to each other in the first direction.
  • the signal light transmission path in the second direction has a repeater optical amplifier, and the transmission light fibers are directly connected to the signal light transmission path in the first direction.
  • an optical transmission line In an optical transmission line according to another aspect of the present invention, two types of transmission line optical fibers having different characteristics are alternately arranged via a housing that accommodates a repeater optical amplifier.
  • a positive dispersion optical fiber having positive dispersion and a negative dispersion optical fiber having negative dispersion are used. Comparing the nonlinearity of both fibers, the negative dispersion optical fiber is generally higher. Therefore, in a case that accommodates a repeater optical amplifier that is disposed on one side (for example, the right side) of an optical transmission cable that accommodates only a negative dispersion optical fiber, transmission of signal light in one direction (for example, right direction) is possible.
  • the transmission path connects a positive dispersion optical fiber and a negative dispersion optical fiber via a repeater optical amplifier.
  • the transmission path for signal light in the opposite direction to that of the positive dispersion optical fiber and the negative distribution optical fiber without amplification. Connect the diffuse fiber.
  • the signal light transmission path in the opposite direction is A positive dispersion optical fiber and a negative dispersion optical fiber are connected via a repeater optical amplifier, and a positive dispersion optical fiber and a negative dispersion optical fiber are connected without amplifying the signal light transmission line in one direction.
  • the optical transmission line of the present invention includes an optical transmission cable that accommodates only a positive dispersion optical fiber and an optical transmission cable that accommodates only a negative dispersion optical fiber via a casing that accommodates a repeater optical amplifier. Place them alternately.
  • a part of the output light of this relay optical amplifier or a part of the return light directed to this relay optical amplifier from the subsequent transmission path is taken out and
  • a configuration may be provided that includes a first loopback circuit that can be inserted so as to propagate in the transmission path for the second direction signal light.
  • the loopback circuit includes an optical filter that passes only light of a specific wavelength assigned to monitor the transmission path for signal light in the first direction and removes light of other wavelengths.
  • the optical isolator is configured so that light can only pass through one side.
  • a part of the output light of this relay optical amplifier, or a subsequent transmission path force is output to the relay optical amplifier for the second direction signal light.
  • a part of the return light is directed to this relay optical amplifier.
  • This is a configuration with a second loopback circuit that can be taken out and inserted into the first direction signal light transmission line so as to propagate in the first direction.
  • This loopback circuit has a filter function that allows only light of a specific wavelength assigned to monitor the transmission path for signal light to pass and removes light of other wavelengths.
  • a configuration including an optical isolator that allows light to pass through only one side may be used.
  • the optical transmission line of the present invention is characterized in that each fiber length is adjusted so that the dispersion maps in both directions have the same shape.
  • the entire optical transmission cable is configured by connecting transmission cables (two types) that accommodate a single type of optical fiber, whereby a transmission line using a conventional distributed flat transmission line is provided.
  • a complicated configuration in which a plurality of types of optical fibers are accommodated in the optical transmission cable can be avoided, and the difficult work of connecting different types of fibers in the optical cable is eliminated.
  • the present invention only one direction of optical amplifier is accommodated in the casing that accommodates the repeater optical amplifier, and therefore, when the same size casing is used, the number is twice that of the conventional method.
  • the size of the housing accommodating the repeater optical amplifier can be halved.
  • the present invention provides a loopback transmission line that can detect a disconnection / failure at an arbitrary point even when the bidirectional optical amplifiers are not present at the same location. For this reason, it is possible to detect a disconnection 'failure using an existing monitoring device as it is.
  • FIG. 1 is a diagram showing a configuration of an embodiment of the present invention.
  • FIG. 2 is a diagram showing a configuration of a conventional distributed flat transmission line.
  • FIG. 3 is a diagram showing a configuration of a conventional optical transmission cable using a distributed flat transmission line.
  • FIG. 4 is a diagram showing a configuration of a distributed flat transmission line that is easy to manufacture.
  • FIG. 5 is a diagram showing an example of a conventional transmission line monitoring loopback configuration.
  • FIG. 6 is a diagram showing a configuration when a loopback circuit is added for a transmission line in an embodiment of the present invention.
  • FIG. 7 shows the path of the transmission line monitoring signal when a disconnection occurs in the positive dispersion optical fiber cable.
  • (B) shows the transmission line monitoring when a disconnection occurs in the negative dispersion optical fiber cable.
  • (c) is the figure which shows the course of the transmission line monitoring signal when a failure occurs in the repeater optical amplifier.
  • FIG. 8 (a) is a diagram showing an example of a dispersion map not suitable for the transmission line of the present invention, and (b) is the present invention. It is a figure which shows an example of the dispersion
  • optical transmission cable according to the best mode for carrying out the present invention will be described in detail with reference to the drawings.
  • optical transmission cable multiple units for right-facing and left-facing are accommodated.
  • FIG. 1 is a diagram showing a configuration of the first exemplary embodiment of the present invention.
  • housings 26 and 27 for accommodating repeater optical amplifiers are connected to each connection point of the optical transmission cable 16 that accommodates the positive dispersion optical fiber and the optical transmission cable 17 that accommodates the negative dispersion optical fiber. Each is arranged.
  • the right-facing repeater optical amplifier 21 is disposed in a casing 26 disposed at the right end of each negative dispersion optical fiber cable 17.
  • the left-facing transmission line optical fiber 31 is connected in this case 26 without performing optical amplification. If the right-facing transmission line optical fiber 30 is an uplink, for example, the left-facing transmission line optical fiber 31 is a downlink.
  • the left-facing repeater optical amplifier 22 is disposed in a casing 27 disposed at the left end of each positive dispersion optical fiber cable 17.
  • the right-facing transmission line optical fiber 30 is disposed in the casing 27. In this case, the connection is made without performing optical amplification.
  • a pair of positive dispersion optical fibers and negative dispersion optical fibers are connected between the repeater optical amplifiers, as in the conventional dispersion flat transmission line.
  • the present invention is not limited to a powerful configuration.
  • a relay optical amplifier is inserted in both cases in a casing that accommodates each relay optical amplifier, and a structure including a pump light source for Raman amplification is provided.
  • An optical transmission cable is required to have a function of detecting a point from a remote terminal station when a disconnection or a repeater failure occurs.
  • the outputs of the right signal amplifier 113 and the left signal amplifier 114 are used as means for obtaining signals necessary for constantly monitoring the state of the transmission line.
  • a part is taken out by the couplers 115 and 117, and is combined and propagated through the loopback circuit to the transmission line on the opposite side.
  • the configuration of the loopback circuit Basically, it is performed before and after a pair of bidirectional amplifiers in the housing 112 in which the central unit is accommodated.
  • the second embodiment of the present invention is an optical transmission cable provided with a loopback transmission line that enables the use of this method.
  • FIG. 6 is a diagram showing a configuration of the second exemplary embodiment of the present invention.
  • An optical power bra 55 for extracting a part of the return light is arranged at the output of the relay optical amplifier 21 for signal light directed to the right.
  • the return light extracted by the optical power bra 55 passes through the optical filter 52 that passes only the signal light wavelength ⁇ a for monitoring the rightward transmission path 30, and then accommodates the rightward signal light relay optical amplifier. In the casing 26, the light is transmitted by the optical power bra 56 so as to propagate leftward to the leftward transmission path 31.
  • an optical power bra 57 that extracts a part of the return light is arranged at the output of the relay optical amplifier 22 for left signal light.
  • the return light extracted by the optical power bra 57 passes through the optical filter 53 that passes only the signal light wavelength ⁇ b for monitoring the left-facing transmission path, and then the left-handed signal light repeater optical amplifier housing 27 To the right transmission line 30 with light power bra 58 Combined to propagate right.
  • this configuration force is effective in detecting the location of the transmission line cable at an arbitrary point or the location of the fault relay amplifier.
  • Fig. 7 (a) shows the signal light for transmission line monitoring when there is a break in the positive dispersion optical fiber cable connecting the case 26 containing the repeater optical amplifier and the case 27-b. This shows the state of propagation.
  • the propagation path of the monitoring signal for the right-handed transmission line is indicated by 60
  • the propagation path of the monitoring signal for the left-handed transmission line is indicated by 61.
  • the monitoring signal light generates a large reflection component at the point where the disconnection occurs.
  • the signal light for monitoring the transmission line to the right is reflected at the disconnection point, and then inserted into the transmission line 31 to the left by the loopback circuit (consisting of a force bra, optical filter, and force bra) in the repeater optical amplifier housing 26. It is transmitted to the left end station.
  • the signal light for monitoring the left-facing transmission line is reflected by the loopback circuit (consisting of a force bra, an optical filter, and a force bra) of the repeater optical amplifier housing 27-b after being reflected at the disconnection point. It is inserted into the rightward transmission line 30 and transmitted to the right end station.
  • Figure 7 (b) shows the propagation of the signal light for transmission line monitoring when there is a break in the negative dispersion optical fiber cable connecting the repeater optical amplifier casings 27-a and 26-b. This shows the state.
  • the propagation path of the monitoring signal for the right-handed transmission line is indicated by 60
  • the propagation path of the monitoring signal for the left-handed transmission line is indicated by 61.
  • the casing 27—a that houses the repeater optical amplifier (the optical filter (b in the loopback circuit of the repeater optical amplifier housing 27—a) Is inserted into the transmission line 31 to the left by the loop-back circuit of the repeater optical amplifier housing 26-a (the optical filter only transmits ⁇ a).
  • the signal light for monitoring the left-facing transmission path is reflected at the disconnection point, passes through the repeater optical amplifier housing 26-b, and loops back in the repeater optical amplifier housing 27-b (The optical filter is inserted into the rightward transmission path 30 by transmitting only ⁇ b).
  • Fig. 7 (c) shows the propagation of the signal light for transmission line monitoring when the right optical transmission line optical amplifier in the relay optical amplifier housing 26-b fails and no output is produced. What showed the situation It is.
  • the point that distinguishes between failure and disconnection of the repeater is the amount of reflection component detected at the end point when observed with OTDR (Optical Time Domain Refrectometry).
  • OTDR Optical Time Domain Refrectometry
  • the feature in the case of disconnection is that a large amount of reflection component is generated by Fresnel reflection, and such a reflection component does not occur in the case of a repeater failure.
  • the transmission path monitoring signal light component returned to the leftmost transmission path monitoring device is the relay optical amplifier. This is a Rayleigh scattering component generated in the transmission line on the left side of the housing case 26-b.
  • the transmission path monitoring signal light component itself reaches the left end, but the transmission path monitoring signal light component that attempts to return to the right end transmission path monitoring apparatus via the loopback circuit is relayed.
  • the return light component generated on the left side of the optical amplifier housing case 27-a is blocked by the failed relay optical amplifier for the rightward transmission path in the repeater optical amplifier housing case 26-b.
  • the dispersion map is a plot of the amount of chromatic dispersion accumulated in the signal light in the long direction of the transmission line.
  • the optical transmission cable! / Because the optical transmission cable! /, The length of the positive dispersion optical fiber and the length of the negative dispersion optical fiber are shared in both directions, it is perfectly optimal for signal light in both directions. It is difficult to design a dispersion map. [0062] In order to give priority to the optimization of the dispersion map for the signal light in both directions, an optical fiber for dispersion adjustment or a dispersion adjustment device is slightly installed in the housing that accommodates the optical amplifier. There is a technique of inserting. However, this method is not necessarily preferable in terms of transmission characteristics because it causes an increase in total transmission distance or an increase in span loss.
  • a transmission path is designed so that desired transmission characteristics can be obtained for a signal in one traveling direction. At this time, design should be performed with the following two points in mind.
  • the length of each span should be as uniform as possible, and when a slight variation in the span length is required, the length of one type of fiber (positive dispersion optical fiber or negative dispersion optical fiber) is required. This should be as uniform as possible over the neighboring spans.
  • the dispersion map of the configured transmission path is formed into an odd function when the center point in the distance direction of the transmission path is zero (being point-symmetric at the center point).
  • Figure 8 (a) shows a dispersion map designed for a 40-span system with a monotone increase for the first 20 spans and a monotone decrease for the second 20 spans for right-point signal light.
  • the dispersion map which the signal light of each direction feels when the optical transmission cable is constructed based on the construction method of the optical transmission cable according to the present invention is shown.
  • the dispersion map for the rightward signal light is as designed, but for the leftward signal light, the first 20 spans monotonically decreases and the second 20 spans monotonically increase.
  • the signal light in both directions has a completely different dispersion map. This is because the designed dispersion map has the shape of an even function when the center of the transmission line (that is, the end point of 20 spans) is zero.
  • the optical transmission cable was constructed based on the construction method of the optical transmission cable according to the present invention.
  • distribution map which the signal light of each direction senses is shown.
  • the signal light in both directions has substantially the same dispersion map. This is because the designed dispersion map has an odd function shape when the center of the transmission line (that is, the end point of 50 spans) is zero.
  • the optical transmission cable is a simple connection of two optical cables, that is, only the positive dispersion optical fiber and only the negative dispersion optical fiber, respectively. Eliminates the difficult task of connecting different types of fibers in the cable, and simplifies the production of optical transmission cables using distributed flat transmission lines that are highly effective for large-capacity long-distance transmission! .
  • each housing accommodating repeaters only one-way repeater optical amplifier is accommodated in each housing accommodating repeaters, so that it can be accommodated in an optical transmission cable as compared with the conventional configuration.
  • the number of transmission lines can be easily doubled, and the size of the repeater optical amplifier housing required for housing the same number of transmission lines can be reduced.
  • the loopback transmission line provides the same function as the conventional system, the bidirectional optical amplifiers are not present at the same place, but any arbitrary number in the transmission line can be obtained. It is possible to use the conventional equipment configuration for detecting disconnection / failure at the point as it is.

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

Abstract

Chemin de transmission optique à grande distance et dispositif de transmission de communication optique susceptibles de transmettre un signal de grande capacité par âme. Un câble de chemin de transmission contenant seulement des fibres optiques de distribution positive et un câble de chemin de transmission contenant seulement des fibres optiques de distribution négative sont branchés alternativement par l’intermédiaire d’un boîtier contenant un amplificateur optique de relais. Dans un boîtier contenant un amplificateur optique de relais (26) agencé d’un côté de la fibre optique de distribution négative, un amplificateur optique de relais (21) est agencé seulement pour le chemin de transmission de lumière de signal d’une première direction et le chemin de transmission de lumière de signal de l’autre direction est branché directement. Dans un boîtier contenant un amplificateur optique de relais (27) agencé de l’autre côté de la fibre optique de distribution négative, un amplificateur optique de relais (22) est agencé seulement pour le chemin de transmission de lumière de signal d’une seconde direction et le chemin de transmission de lumière de signal de la première direction est branché directement.
PCT/JP2005/013232 2004-07-22 2005-07-19 Cable de transmission optique pour communication optique, procede de fabrication de celui-ci et dispositif de transmission de communication optique WO2006009133A1 (fr)

Priority Applications (1)

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JP2006529217A JP4894516B2 (ja) 2004-07-22 2005-07-19 光通信向け光伝送ケーブルとその製造方法および光通信伝送装置

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JP2004-214549 2004-07-22
JP2004214549 2004-07-22

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WO2006009133A1 true WO2006009133A1 (fr) 2006-01-26

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11266205A (ja) * 1998-03-17 1999-09-28 Nec Corp 光増幅中継器およびその監視方法

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CA2068926C (fr) * 1991-09-03 1997-08-26 Cleo D. Anderson Dispositif de detection de defauts dans un systeme optique
JP3567782B2 (ja) * 1999-03-09 2004-09-22 Ｋｄｄｉ株式会社 分散補償光伝送路及びシステム
JP4372330B2 (ja) * 2000-10-30 2009-11-25 富士通株式会社 分布型光増幅装置、光通信用の局および光通信システム
JP4523188B2 (ja) * 2001-03-16 2010-08-11 富士通株式会社 光増幅伝送システム
JP4001782B2 (ja) * 2002-06-13 2007-10-31 三菱電機株式会社 利得形状調節方法及びシステム

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JPH11266205A (ja) * 1998-03-17 1999-09-28 Nec Corp 光増幅中継器およびその監視方法

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MINO K. ET AL: "EDFA Hikari Chukeiki oyobi Bunsan Managed Fiber ni yoru 40Gb/s Hacho Taju Denso System. (40Gb/s-based WDM transmision system using EDFA and DMF)", THE INSTITUTE OF ELECTRONICS, INFORMATION AND COMMUNICATION ENGINEERS GIJUTSU KENKYU HOKOKU., vol. 104, no. 126, 18 June 2004 (2004-06-18), pages 55 - 60, XP002998924 *
MORITA ITSURO ET AL: "40Gbit/sx16 WDM transmission over 200km using dispersion managed low-nonlinear fiber span.", 20TH EUROPEAN CONFERENCE ON OPTICAL COMMUNICATION., vol. 4, 3 September 2000 (2000-09-03) - 7 September 2000 (2000-09-07), pages 25 - 27, XP001079833 *
MURAKAMI M ET AL: "Quarter terabit (25x10Gb/s) over 9288km WDM transmission experiment using nonlinear supported RZ pulse in higher order fiber dispersion managed line.", 24TH EUROPEAN CONFERENCE ON OPTICAL COMMUNICATION (ECOC'98)., vol. 3, 20 September 1998 (1998-09-20) - 24 September 1998 (1998-09-24), pages 79 - 81, XP002345951 *

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