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WO2006035493A1 - Dispositif d’insertion de branchement de longueur d’onde de lumière - Google Patents

Dispositif d’insertion de branchement de longueur d’onde de lumière Download PDF

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Publication number
WO2006035493A1
WO2006035493A1 PCT/JP2004/014162 JP2004014162W WO2006035493A1 WO 2006035493 A1 WO2006035493 A1 WO 2006035493A1 JP 2004014162 W JP2004014162 W JP 2004014162W WO 2006035493 A1 WO2006035493 A1 WO 2006035493A1
Authority
WO
WIPO (PCT)
Prior art keywords
optical
wavelength
signal
variable
attenuation
Prior art date
Application number
PCT/JP2004/014162
Other languages
English (en)
Japanese (ja)
Inventor
Takashi Sugihara
Katsuhiro Shimizu
Taichi Kogure
Aritomo Uemura
Satoshi Oota
Original Assignee
Mitsubishi Denki Kabushiki Kaisha
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 Mitsubishi Denki Kabushiki Kaisha filed Critical Mitsubishi Denki Kabushiki Kaisha
Priority to JP2006537587A priority Critical patent/JP4545757B2/ja
Priority to PCT/JP2004/014162 priority patent/WO2006035493A1/fr
Publication of WO2006035493A1 publication Critical patent/WO2006035493A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0221—Power control, e.g. to keep the total optical power constant
    • H04J14/02216—Power control, e.g. to keep the total optical power constant by gain equalization

Definitions

  • the present invention relates to an optical wavelength add / drop multiplexer disposed at a node position of an optical communication network.
  • the optical output power control unit 12 displays the optical signal power monitor constant control start threshold as the optical signal power level monitor detection result. If not, it is determined that the operation of the optical add / drop multiplexer connected upstream is not yet stable, and is fixed so that excessive optical signal power is not output downstream to the variable optical attenuator 10. Attenuation can be set.
  • the optical output power control unit 12 changes the variable light regardless of the optical signal level monitor detection result.
  • the attenuation means 10 By setting the attenuation means 10 to the maximum passing loss, it is possible to set so that the optical signal is not transferred downstream regardless of the state of the signal input from the upstream. Such movement By performing the operation, it is possible to prevent the downstream from being adversely affected when an abnormality has occurred upstream. Therefore, the reliability of the entire optical communication network can be improved.
  • the storage means 20 can store a plurality of threshold values for each channel according to the operation to be set as the optical output constant constant control start threshold value, finer operation setting is possible. It becomes. For example, there is a threshold value for detecting the occurrence of excessive output power when the output power exceeds a certain level and the signal quality level may deteriorate due to nonlinear optical effects or crosstalk. According to this, for example, by monitoring the excessive output or the excessive output, it is possible to monitor the optical signal disconnection detection, the control abnormality of the variable optical attenuating means 10, etc., and the optical output is interrupted accordingly. Or, by setting the operation mode such as generating an alarm, the reliability of the optical communication network can be further improved.
  • the amount of attenuation given to the variable optical attenuation means is fixed.
  • the external supervisory control device power can be autonomously operated with a simple configuration without receiving a special signal. It is possible to obtain an optical wavelength add / drop device that can speed up the transition to constant constant control and can easily implement a highly reliable optical communication network at low cost.
  • the optical wavelength add / drop device has a wavelength demultiplexing means 3 as a configuration related to the constant control of the optical output power level to flatten the passing optical signal level.
  • variable optical attenuating means 31 optical signal level monitoring means 32, wavelength multiplexing means 33, and optical output power control unit 12-1 to 12-n.
  • the supervisory control device 35 is a device that supervises the optical wavelength branching / inserting device.
  • the optical output power control unit 12-1-12- For n it has a function to specify the operation mode.
  • the wavelength demultiplexing means 30 demultiplexes the input wavelength multiplexed optical signal into optical wavelength signals (Ch. 1—Ch. N), and applies them to the variable optical attenuation means 31 in parallel.
  • the wavelength multiplexing means 33 combines the optical wavelength signal (Ch. 1-Ch. N) input from the optical branching means of the optical signal level monitoring means 32 with the wavelength multiplexed optical signal and sends it to the downstream optical transmission line. Send it out.
  • optical path switching means 40 is connected to wavelength demultiplexing means 30.
  • an optical wavelength add / drop control function unit 44 1 1 44n is provided.
  • the operation mode setting means 45 determines switching of the optical path according to the operation mode designation content from the supervisory control device 35 in addition to the determination operation of the optical output constant control described in the first embodiment. Based on this, an operation for issuing an instruction to the optical path switch control means 46 is performed.
  • the optical path switch control means 46 controls the corresponding optical path switch in the optical path switching means 40 to the branch operation state and the pass operation state according to the instruction of the operation mode setting means 45.
  • the optical signal level of the insertion channel is adjusted by a variable optical attenuating means or an optical amplifying means (not shown) or multiplexed by the optical multiplexing means 42 so as to be approximately equal to the optical signal level of the passing channel. It is desirable to take measures such as setting the power ratio asymmetrically. As an example of a case where the combined power ratio of the optical combining means 42 is set asymmetrically, for example, when the power of the insertion channel is lower than the power of the passing channel, the insertion loss of the insertion channel becomes small. Set to wave power ratio.
  • FIG. 4 is a flowchart for explaining an example of the control method of the variable attenuation means in the optical wavelength add / drop device shown in FIG.
  • step ST2 when the operation mode designation from the supervisory control device 35 is a designation for setting the branch operation of the optical path switching means (step ST2: Yes), the other channel or the insertion channel is not adversely affected.
  • the variable light attenuating means 31 is kept in the blocking setting so as to block the leaked light passing therethrough (step ST1).
  • FIG. 5 is a block diagram showing a configuration of an optical wavelength add / drop multiplexer according to Embodiment 4 of the present invention.
  • a configuration example in which the optical wavelength add / drop device according to this embodiment is prepared for each channel block is shown.
  • components that are the same as or equivalent to the components shown in FIG. 3 are assigned the same reference numerals.
  • the description will focus on the parts related to the fourth embodiment.
  • a wavelength group demultiplexing unit 50 is provided at the input stage for the optical wavelength add / drop function units 55a and 55b.
  • the wavelength group demultiplexing means 50 has a function of demultiplexing a wavelength-multiplexed optical signal into a plurality of different wavelength groups as one wavelength group.
  • the wavelength multiplexed optical signal is demultiplexed into even channels and odd channels.
  • the optical wavelength add / drop function unit 55a is for even channels
  • the optical wavelength add / drop function unit 55b is odd channels.
  • the output stage is provided with multiplexing means 57 for multiplexing the wavelength-multiplexed optical signals of the optical wavelength add / drop function units 55a and 55b.
  • multiplexing means 57 for multiplexing the wavelength-multiplexed optical signals of the optical wavelength add / drop function units 55a and 55b.
  • a wavelength group multiplexing means having characteristics opposite to those of the wavelength group demultiplexing means 50 may be used in place of the multiplexing means 57.
  • the wavelength group demultiplexing means 50 performs group demultiplexing into an even channel and an odd channel.
  • the optical wavelength add / drop function units 55a and 55b in the subsequent stage need only handle each channel group.
  • Has its own advantages For example, if an optical signal channeled at 100 GHz intervals is demultiplexed into an even channel group and an odd channel group, each becomes a channel group allocated at 200 GHz intervals, so that an optical wavelength add / drop multiplexer is configured. Therefore, the wavelength demultiplexing means 30 and the wavelength multiplexing means 33 to be configured can be easily configured, and the cost can be reduced.
  • FIG. 6 is a block diagram showing a configuration of an optical wavelength add / drop multiplexer according to Embodiment 5 of the present invention.
  • the optical amplifying means is provided in both or one of the input stage and the output stage of the optical wavelength branching and inserting device according to each of the embodiments described above.
  • components that are the same as or equivalent to the components shown in FIG. 4 are assigned the same reference numerals.
  • the description will focus on the parts related to the fifth embodiment.
  • optical amplification means 60 is provided in the input stage, and output stage The optical amplifying means 61 is provided.
  • the optical amplifying means may be provided in one of the input stage and the output stage of the optical wavelength add / drop device.
  • the spontaneous emission light of the optical amplifying means 60 is also input to the optical signal level monitoring means in addition to the signal of the channel, the optical signal level constant control is started. If the threshold value is set too low, a malfunction may occur in which the level of spontaneous emission light is controlled even though the signal of the channel has not yet reached. Therefore, in the fifth embodiment, in order to accurately start control of the optical signal level of the passing channel, an intermediate value between the maximum level of spontaneous emission light and the minimum signal level of the channel is set as a threshold value. I have to. As a result, the optical amplification means Even when used together, it can be identified that the passing channel has reached the optical signal level monitoring means, and erroneous control of the variable optical attenuating means can be avoided.
  • the loss of the transmission line and the optical add / drop multiplexer is compensated by adding the optical amplifying means to the input / output stage of the optical wavelength add / drop multiplexer. This makes it easy to extend the transmission distance, increase the number of connected nodes, increase the number of channels, and so on.
  • the optical amplifying means 60 and 61 have a constant gain control. By simply performing the control, the optical signal level of each channel can be obtained as a flattened state as the output of the optical amplifying means 61, easily extending the transmission distance, increasing the number of connected nodes, and increasing the number of channels. The effect of can be obtained.
  • each optical component for example, the optical signal level monitor means 32-
  • the target value of the optical signal level constant control may be offset for each channel so as to compensate for the loss wavelength characteristic of the optical components arranged up to the optical amplifying means 61. According to this, it is possible to improve the signal level flatness of the output wavelength multiplexed optical signal.
  • An offset may be provided in the threshold so as to compensate for the loss wavelength characteristics of the components (for example, optical components arranged between the optical amplifying means 60 and the optical signal level monitoring means 32). According to this, it is possible to absorb the performance variation of the optical component with an offset, and to effectively use the dynamic range of the variable optical attenuating means with respect to the detection threshold, and to easily increase the controllable range of the variable optical attenuating means. be able to.
  • the optical wavelength add / drop multiplexer according to the present invention is useful for construction of an optical communication network that can extend the transmission distance and increase the number of passing nodes.

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

Abstract

L'invention concerne un dispositif d’insertion de branchement de longueur d’onde de lumière pouvant effectuer une commande permanente de puissance de sortie optique pour lisser le niveau du signal optique de chaque canal en tant que lumière passant, avec une structure simple ne demandant pas un signal de déclenchement spécial et avec une haute fiabilité depuis la mise en route du système à haute vitesse. L’unité de commande permanente de puissance de sortie optique (12) commande un moyen d’atténuation variable de lumière de manière telle qu’une quantité d’atténuation fixe soit donnée à chaque signal de longueur d’onde de lumière dans le signal de lumière multiplex en longueur d’onde entré, jusqu’à ce que le résultat de surveillance du moyen de surveillance de puissance dépasse la valeur de seuil de commande permanente de puissance de sortie optique. Lorsque le résultat de surveillance dépasse la valeur de seuil, l’unité de commande permanente de puissance de sortie optique (12) démarre le moyen d’atténuation variable de lumière de façon à appliquer une quantité d’atténuation requise pour obtenir la valeur cible de la commande permanente de puissance optique de sortie pour lisser le niveau du signal optique transmis au chemin de transmission de lumière aval à chaque signal de longueur d’onde de lumière du signal de lumière multiplex en longueur d’onde entré.
PCT/JP2004/014162 2004-09-28 2004-09-28 Dispositif d’insertion de branchement de longueur d’onde de lumière WO2006035493A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2006537587A JP4545757B2 (ja) 2004-09-28 2004-09-28 光波長分岐挿入装置
PCT/JP2004/014162 WO2006035493A1 (fr) 2004-09-28 2004-09-28 Dispositif d’insertion de branchement de longueur d’onde de lumière

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2004/014162 WO2006035493A1 (fr) 2004-09-28 2004-09-28 Dispositif d’insertion de branchement de longueur d’onde de lumière

Publications (1)

Publication Number Publication Date
WO2006035493A1 true WO2006035493A1 (fr) 2006-04-06

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PCT/JP2004/014162 WO2006035493A1 (fr) 2004-09-28 2004-09-28 Dispositif d’insertion de branchement de longueur d’onde de lumière

Country Status (2)

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JP (1) JP4545757B2 (fr)
WO (1) WO2006035493A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPWO2007138649A1 (ja) * 2006-05-25 2009-10-01 三菱電機株式会社 光中継装置および光中継伝送システム
JP2012504881A (ja) * 2008-10-03 2012-02-23 テレフオンアクチーボラゲット エル エム エリクソン（パブル） 光リンクにおけるチャネルパワーの制御

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000151512A (ja) * 1998-11-04 2000-05-30 Fujitsu Ltd 波長分波器を用いた光波長分割多重システム
JP2003163641A (ja) * 2001-11-28 2003-06-06 Fujitsu Ltd 可変減衰器制御システム
JP2003521829A (ja) * 1998-06-04 2003-07-15 アヴァネックス コーポレイション 光学的かつプログラミング可能な光ファイバ波長アッド／ドロップシステム
JP2003304197A (ja) * 2002-04-09 2003-10-24 Nippon Telegr & Teleph Corp <Ntt> 波長多重分割回路

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003521829A (ja) * 1998-06-04 2003-07-15 アヴァネックス コーポレイション 光学的かつプログラミング可能な光ファイバ波長アッド／ドロップシステム
JP2000151512A (ja) * 1998-11-04 2000-05-30 Fujitsu Ltd 波長分波器を用いた光波長分割多重システム
JP2003163641A (ja) * 2001-11-28 2003-06-06 Fujitsu Ltd 可変減衰器制御システム
JP2003304197A (ja) * 2002-04-09 2003-10-24 Nippon Telegr & Teleph Corp <Ntt> 波長多重分割回路

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPWO2007138649A1 (ja) * 2006-05-25 2009-10-01 三菱電機株式会社 光中継装置および光中継伝送システム
JP4724226B2 (ja) * 2006-05-25 2011-07-13 三菱電機株式会社 光中継装置および光中継伝送システム
US8208812B2 (en) 2006-05-25 2012-06-26 Mitsubishi Electric Corporation Optical relay device and optical relay transmission system
JP2012504881A (ja) * 2008-10-03 2012-02-23 テレフオンアクチーボラゲット エル エム エリクソン（パブル） 光リンクにおけるチャネルパワーの制御

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JPWO2006035493A1 (ja) 2008-05-15
JP4545757B2 (ja) 2010-09-15

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