JPH02141133A - Optical communication network system - Google Patents
Optical communication network systemInfo
- Publication number
- JPH02141133A JPH02141133A JP63294937A JP29493788A JPH02141133A JP H02141133 A JPH02141133 A JP H02141133A JP 63294937 A JP63294937 A JP 63294937A JP 29493788 A JP29493788 A JP 29493788A JP H02141133 A JPH02141133 A JP H02141133A
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- Prior art keywords
- optical
- wavelength
- optical wavelength
- lan
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- Prior art date
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Links
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- 238000004891 communication Methods 0.000 title claims abstract description 20
- 238000006243 chemical reaction Methods 0.000 claims abstract description 27
- 230000008054 signal transmission Effects 0.000 claims abstract description 10
- 239000013307 optical fiber Substances 0.000 abstract description 10
- 230000005540 biological transmission Effects 0.000 abstract description 8
- 101100048435 Caenorhabditis elegans unc-18 gene Proteins 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 5
- 238000000605 extraction Methods 0.000 description 5
- 230000003321 amplification Effects 0.000 description 4
- 238000003199 nucleic acid amplification method Methods 0.000 description 4
- 238000007493 shaping process Methods 0.000 description 4
- QNRRHYPPQFELSF-CNYIRLTGSA-N Laninamivir Chemical compound OC[C@@H](O)[C@@H](OC)[C@@H]1OC(C(O)=O)=C[C@H](N=C(N)N)[C@H]1NC(C)=O QNRRHYPPQFELSF-CNYIRLTGSA-N 0.000 description 2
- 230000002457 bidirectional effect Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
Landscapes
- Light Guides In General And Applications Therefor (AREA)
- Optical Communication System (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は光通信ネットワークシステムに関し、特に使用
光波長が異なる複数のネットワークを結合してなる光通
信ネットワークシステムに関する。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an optical communication network system, and more particularly to an optical communication network system formed by coupling a plurality of networks using different optical wavelengths.
従来の技術
光ファイバを光信号伝送媒体としたローカルエリアネッ
トワーク（ＬＡＮ）の多くは、使用光波長が０，８５μ
ｍの短波長であったが、近年の技術進歩により、伝送損
失を減らして伝送距離を延長できる１、３μｍの長波長
の光波長を使用したＬＡＮが次第に増えてきている。そ
の結果、現在は使用光波長が異なまたＬＡＮが併存して
いるのが実情である。Conventional technology Most local area networks (LANs) using optical fiber as an optical signal transmission medium use optical wavelengths of 0.85μ.
However, due to recent technological advances, the number of LANs using light wavelengths as long as 1 to 3 μm, which can reduce transmission loss and extend transmission distance, is gradually increasing. As a result, the current situation is that LANs that use different optical wavelengths coexist.
従来、このような使用光波長が異なるＬＡＮを接続した
光通信ネットワークシステムは、第４図に示すように、
短波長（０８５μｍ）のリング状ＬＡＮ４１と長波長（
１，３μｍ）のリング状Ｌ Ａ Ｎ ４２とをゲートウ
ェイ装置４３で接続したような構成であった。ゲートウ
ェイ装置４３は光波長変換のほかネットワーク層あたり
までのプロトコル、通信形態の変換処理を行う。Conventionally, an optical communication network system in which LANs using different wavelengths of light are connected is as shown in Fig. 4.
A ring-shaped LAN 41 with a short wavelength (085 μm) and a long wavelength (085 μm)
The configuration was such that a ring-shaped LAN 42 of 1.3 μm) was connected by a gateway device 43. The gateway device 43 performs not only optical wavelength conversion but also protocol and communication format conversion processing up to the network layer.
発明が解決しようとする課題
しかし、このようなゲートウェイ装置によってＬＡＮを
接続した構成によれば、各ＬＡＮは基本的には独立して
おり、全体として２元的あるいは多元的なネットワーク
システムとなるため、あるＬＡＮのノードと別のＬＡＮ
のノードとの間で通信を行う場合、ゲートウェイ装置の
ソフトウェア制御が必須であり、システム全体の制御が
複雑になるとともに、またゲートウェイ装置も高価にな
るという問題があった。Problems to be Solved by the Invention However, according to the configuration in which LANs are connected by such a gateway device, each LAN is basically independent, resulting in a dual or multidimensional network system as a whole. , a node on one LAN and another LAN
When communicating with nodes, software control of the gateway device is essential, which poses a problem in that control of the entire system becomes complicated and the gateway device also becomes expensive.
本発明は、上述の問題点に鑑みてなされたもので、高価
なゲートウェイ装置を用いずに使用光波長が異なる複数
のネットワークよシ構築された一元的な通信ネットワー
クシステムを提供することを目的とする。The present invention was made in view of the above-mentioned problems, and an object of the present invention is to provide a unified communication network system constructed of multiple networks using different optical wavelengths without using an expensive gateway device. do.
なお、目的は違うが、光信号を電気信号に変換したのち
別の光波長の光信号に変換するとともに、光学的手段を
利用して１本の光ファイバによる双方向伝送を可能にし
た双方向光波長変換装置（特開昭６２−１０４３２８号
）が知られている。Although the purpose is different, bidirectional transmission is a method that converts an optical signal into an electrical signal, and then converts it into an optical signal of a different optical wavelength, and uses optical means to enable bidirectional transmission through a single optical fiber. An optical wavelength conversion device (Japanese Unexamined Patent Publication No. 104328/1983) is known.
課題を解決するだめの手段
本発明は上述の課題を解決するため、複数のネットワー
クの光信号伝送媒体を、光波長変換手段を介してそれぞ
れ直列的に、全体としてリング状に接続したという構成
を備えたものである。Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a configuration in which optical signal transmission media of a plurality of networks are connected in series through optical wavelength conversion means, forming a ring shape as a whole. It is prepared.
作用
本発明は上述の構成によって、各ネットワークの使用光
波長が異なっていても、光波長変換手段により、それぞ
れの光信号伝送媒体上の光信号は接続相手のネットワー
クの光信号伝送媒体へその使用光波長の光信号に変換さ
れて伝達されるため、ネットワーク間の通信が可能であ
る。また、全体としてリング状の一元的なネットワーク
システムとなるため、ゲートウェイ装置を用いる従来の
システムのような複雑なソフトウェイ制御は必要でない
。According to the above-described structure, even if the optical wavelength used by each network is different, the optical signal on each optical signal transmission medium can be transferred to the optical signal transmission medium of the connected network by the optical wavelength conversion means. Communication between networks is possible because it is converted into an optical signal with an optical wavelength and transmitted. Furthermore, since the entire system is a ring-shaped unified network system, complicated software control unlike conventional systems using gateway devices is not required.
実施例
第１図は本発明の一実施例による光通信ネットワークシ
ステムの概略構成を示すもので、１は使用光波長が短波
長（０，８５μｍ）のＬＡＮ、２は使用光波長が長波長
（１，３μｍ）のＬＡＮである。Embodiment FIG. 1 shows a schematic configuration of an optical communication network system according to an embodiment of the present invention. 1 is a LAN in which the optical wavelength used is a short wavelength (0.85 μm), and 2 is a LAN in which the optical wavelength used is a long wavelength (0.85 μm). 1.3 μm) LAN.
この２つのＬＡＮＩ、２の光信号伝送媒体である光フア
イバケーブル３の各端は長波長から短波長への光波長変
換装置４および短波長から長波長への光波長変換装置５
により、それぞれ直列的に接続され、全体としてリング
状の一元的な光通信ネットワークシステムが構築される
。Each end of an optical fiber cable 3, which is an optical signal transmission medium for these two LANIs, is connected to an optical wavelength converter 4 from a long wavelength to a short wavelength and an optical wavelength converter 5 from a short wavelength to a long wavelength.
These are connected in series to form a unified ring-shaped optical communication network system.
光波長変換装置４，５は光波長変換だけを行って各ＬＡ
ＮＩ、２を接続するもので、プロトコルなどの変換処理
は行わない。したがって、光波長変換装置４，５はゲー
トウェイ装置に比べ遥に安価に実現できるものである。The optical wavelength conversion devices 4 and 5 perform only optical wavelength conversion and convert each LA.
This is used to connect NI, 2, and does not perform conversion processing such as protocols. Therefore, the optical wavelength conversion devices 4 and 5 can be realized at a much lower cost than the gateway device.
このような構成において、ＬＡＮＩのノードからＬＡＮ
２のノードへ送信を行う場合、前者ノードより送信され
た短波長の光信号は光波長変換装置５によって長波長の
光信号に変換されてＬＡＮ２へ伝達され、後者ノードに
受信される。ＬＡＮ２のノードからＬＡＮ１のノードへ
の送信の場合、前者ノードから送出された長波長の光信
号は光波長変換装置４により短波長の光信号に変換され
てＬＡＮＩへ伝達され後者ノードに受信される。このよ
うな光通信の際に、各光波長変換装置４，５のソフトウ
ェア制御は不要である。In such a configuration, from the LANI node to the LAN
When transmitting to node No. 2, the short wavelength optical signal transmitted from the former node is converted into a long wavelength optical signal by the optical wavelength conversion device 5, transmitted to the LAN 2, and received by the latter node. In the case of transmission from a node on LAN2 to a node on LAN1, a long wavelength optical signal sent from the former node is converted into a short wavelength optical signal by the optical wavelength conversion device 4, transmitted to the LANI, and received by the latter node. . During such optical communication, software control of each optical wavelength conversion device 4, 5 is not necessary.
第２図は上記光波長変換装置４，５として使用される光
波長変換装置の一例の構成図である。ここに示す光波長
変換装置は、受光素子１１、受光増幅部１２、タイミン
グ抽出／識別部１３、発光駆動部１４、発光素子１５よ
シ構成されている。FIG. 2 is a configuration diagram of an example of an optical wavelength conversion device used as the optical wavelength conversion devices 4 and 5. As shown in FIG. The optical wavelength conversion device shown here includes a light receiving element 11, a light receiving amplification section 12, a timing extraction/identification section 13, a light emission driving section 14, and a light emitting element 15.
受光素子１１は入力側に接続された光フアイバケーブル
３ａから入力する光信号を電気信号に変換するもので、
ここではＡＰＤ （アバランシェホトダイオード）とす
るが、Ｐ工Ｎホトダイオードなどの受光素子でもよい。The light receiving element 11 converts an optical signal input from the optical fiber cable 3a connected to the input side into an electrical signal.
Although an APD (avalanche photodiode) is used here, a light receiving element such as a P/N photodiode may also be used.
発光素子１５は電気信号を光信号に変換して出力側に接
続された光フアイバケーブル３ｂへ出力するもので、こ
こではレーザダイオード（ＬＤ）とするが、他の発光ダ
イオード（ＬＥＤ）でもよい。The light emitting element 15 converts an electrical signal into an optical signal and outputs it to the optical fiber cable 3b connected to the output side, and is a laser diode (LD) here, but may be another light emitting diode (LED).
当然、発光素子１５の発光波長は光ファイバケーフル３
ｂを媒体として使用しているネットワークの使用光波長
に選ばれる。Naturally, the emission wavelength of the light emitting element 15 is the same as that of the optical fiber cable 3.
b is selected as the optical wavelength used by the network using it as a medium.
受光増幅部１２は、受光素子１１による光信号の変換信
号の波形整形を行う部分でｓｂ、前置増幅器１７、ＡＧ
Ｃループ１８、ＡＧＣ増幅器１９、オフセットキャンセ
ラ加、主増幅器２１より構成される。The light receiving amplification unit 12 is a part that performs waveform shaping of the converted optical signal by the light receiving element 11, and includes a sb, a preamplifier 17, and an AG.
It is composed of a C loop 18, an AGC amplifier 19, an offset canceller, and a main amplifier 21.
タイミング抽出／識別部１３は、受光増幅部１２によシ
波形整形後の信号より受信データと受信クロックを再生
する部分であり、受信クロック抽出のだめのミクサｎ１
フィルタ列およびリミッタ５と、抽出された受信クロ
ックを元に受信データを再生するだめのデータ識別再生
回路２６から構成されるいる。再生された受信データお
よび受信クロックの各信号は発光駆動部１４の送信デー
タおよび送信クロックの信号となる。The timing extraction/discrimination unit 13 is a part that reproduces received data and a reception clock from the signal after waveform shaping by the light reception amplification unit 12, and is a part that reproduces reception data and a reception clock from the signal after waveform shaping by the light reception amplification unit 12.
It consists of a filter array, a limiter 5, and a data identification and regeneration circuit 26 for regenerating received data based on the extracted reception clock. The reproduced reception data and reception clock signals become transmission data and transmission clock signals of the light emission driving section 14.
発光駆動部１４は、送信データによって発光素子１５を
発恍させる部分であり、ＮＲＺ／ＲＺ変換回路ｒ、発光
素子駆動回路路、および発光素子１５の光出力レベルを
安定化させるように発光素子駆動回路路を制御する光出
力制御回路四よシ構成されている。The light emitting drive unit 14 is a part that energizes the light emitting element 15 using transmitted data, and drives the light emitting element 15 so as to stabilize the light output level of the NRZ/RZ conversion circuit r, the light emitting element driving circuit path, and the light emitting element 15. It consists of four optical output control circuits that control the circuit paths.
このような構成の光波長変換装置を第１図中の光波長変
換装置４として用いた場合、入力側光フアイバケーブル
３ａから入力する長波長（１，３μｍ）の光信号は、受
光素子１１によって電気信号に変換されて波形整形、タ
イミング補正を施されたのち、発光素子１５で短波長（
０，８５μｍ）の光信号に変換されて出力側光フアイバ
ケーブル３ｂへ出力される。When the optical wavelength converter having such a configuration is used as the optical wavelength converter 4 in FIG. After being converted into an electrical signal, subjected to waveform shaping and timing correction, the light emitting element 15 converts it into a short wavelength (
0.85 μm) and output to the output side optical fiber cable 3b.
なお、タイミング抽出／識別部１３を省いた簡略構成の
光波長変換装置を用いることもできる。また、光波長変
換装置に受信クロックを監視するととによシ受信斯を検
出し警報などの制御を行う回路を設けたり、発光素子の
光出力レベルの異常を検出して警報などの制御を行う回
路を設けてもよい。Note that it is also possible to use an optical wavelength conversion device with a simplified configuration in which the timing extraction/identification section 13 is omitted. In addition, when the optical wavelength conversion device monitors the reception clock, it is necessary to install a circuit that detects the reception clock and controls alarms, etc., or detects an abnormality in the light output level of the light emitting element and controls alarms, etc. A circuit may also be provided.
第３図は本発明の他の実施例による光通信ネットワーク
システムの概略構成図である。このシステムは、使用光
波長がλｌのＬＡＮ３１、使用光波長がλ２のＬＡＮ３
２、使用光波長がλ３のＬＡＮ３３および使用光波長が
λ４のＬＡＮ３４の光信号伝送媒体（光フアイバケーブ
ル）を光波長変換装置３５．３６゜３７、３８により直
列的に接続し、全体としてループ状の一元的な光通信ネ
ットワークシステムを構築したものである。光波長変換
装置３５．３６．３７．３８としては第２図に示したよ
うな装置を用いることができる。FIG. 3 is a schematic configuration diagram of an optical communication network system according to another embodiment of the present invention. This system consists of LAN31 whose optical wavelength is λl, and LAN3 whose optical wavelength is λ2.
2. The optical signal transmission media (optical fiber cables) of the LAN 33 whose optical wavelength is λ3 and the LAN 34 whose optical wavelength is λ4 are connected in series by an optical wavelength converter 35.36° 37, 38, and the whole is looped. This is a unified optical communication network system. As the optical wavelength conversion device 35, 36, 37, 38, a device as shown in FIG. 2 can be used.
なお、少なくとも一部のＬＡＮの使用光波長が同一であ
ってもよい。例えばλ１−λ、の場合、ＬＡＮ３１，３
，１を接続するだめの光波長変換装置間の代わりに光波
長変換を行わない単なる中継装置を用いることができる
。この中継装置としては、例えば第２図中の発光素子１
５の発光波長をλ、に選んだ構成の装置、あるいはさら
にタイミング抽出／識別部１３を省いた構成の装置を用
いることができる。Note that at least some of the LANs may use the same optical wavelength. For example, in the case of λ1-λ, LAN31,3
, 1 can be replaced by a simple relay device that does not perform optical wavelength conversion. As this relay device, for example, the light emitting element 1 in FIG.
It is possible to use an apparatus having a configuration in which the emission wavelength of 5 is selected to be λ, or an apparatus having a configuration in which the timing extraction/identification section 13 is omitted.
発明の効果
以上の説明から明らかなように、本発明は複数のネット
ワークの光信号伝送媒体を、光波長変換手段を介してそ
れぞれ直列的に、全体としてリング状に接続することに
よシ、高価なゲートウェイ装置を用いることなく、使用
光波長が異なる複数のＬＡＮなどの間の光通信が可能な
一元的な光通信ネットワークシステムを構築できるとい
う効果を有するものである。Effects of the Invention As is clear from the above description, the present invention connects the optical signal transmission media of a plurality of networks in series via optical wavelength conversion means, and in a ring shape as a whole, thereby reducing the cost and cost. This has the effect that it is possible to construct a unified optical communication network system capable of optical communication between a plurality of LANs using different optical wavelengths without using a gateway device.
第１図は本発明の一実施例による光通信ネットワークシ
ステムの概略構成図、第２図は光波長変換装置の一例の
ブロック図、第３図は本発明の他の実施例による光通信
ネットワークシステムの概略構成図、第４図は従来の光
通信ネットワークシステムの概略構成図である。
１、 ２． ３１． ３２． ３３． ３４・・・ＬＡ
Ｎ。
３ｂ・・・光フアイバケーブル、４． ５゜あ・・・光
波長変換装置、１１・・・受光素子、幅部、１３・・・
タイミング抽出／識別部、動部、１５・・・発光素子。
代理人の氏名 弁理士 粟 野 重 孝３．３ａ。
３５、 ３６． ３７゜
１２・・・受光増
１４・・・発光型
ほか１名
７ ＝Ｍｌ”ｉｌ長ＬＡＮ
２−ｍ−長波長ＬＡＮ
３−児ファイバ′ケーブル
４．５− 児波長斐撞装置FIG. 1 is a schematic configuration diagram of an optical communication network system according to an embodiment of the present invention, FIG. 2 is a block diagram of an example of an optical wavelength conversion device, and FIG. 3 is an optical communication network system according to another embodiment of the present invention. FIG. 4 is a schematic diagram of a conventional optical communication network system. 1, 2. 31. 32. 33. 34...LA
N. 3b... optical fiber cable, 4. 5゜A... Optical wavelength conversion device, 11... Light receiving element, width portion, 13...
Timing extraction/identification section, moving section, 15... light emitting element. Name of agent: Patent attorney Shige Takashi Awano 3.3a. 35, 36. 37゜12...Light reception increaser 14...Emission type and 1 other 7 = Ml"il long LAN 2-m-long wavelength LAN 3-Long fiber' cable 4.5-Long wavelength control device
Claims (1)
の手段を介してそれぞれ直列的に、全体としてリング状
に接続されたことを特徴とするとする光通信ネットワー
クシステム。1. An optical communication network system, characterized in that optical signal transmission media of a plurality of networks are connected in series to form a ring as a whole via optical wavelength conversion means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63294937A JP2824982B2 (en) | 1988-11-22 | 1988-11-22 | Optical communication network connection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63294937A JP2824982B2 (en) | 1988-11-22 | 1988-11-22 | Optical communication network connection method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02141133A true JPH02141133A (en) | 1990-05-30 |
| JP2824982B2 JP2824982B2 (en) | 1998-11-18 |
Family
ID=17814208
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63294937A Expired - Fee Related JP2824982B2 (en) | 1988-11-22 | 1988-11-22 | Optical communication network connection method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2824982B2 (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04213928A (en) * | 1990-12-12 | 1992-08-05 | Nec Corp | Optical repeater |
| EP0501946A3 (en) * | 1991-03-01 | 1993-02-03 | Alcatel Austria Aktiengesellschaft | Optical communication system for bidirectional transmission between an exchange and a plurality of subscribers |
| JP2001028567A (en) * | 1999-07-14 | 2001-01-30 | Furukawa Electric Co Ltd:The | Optical wavelength conversion device and optical communication system |
| JP2002084259A (en) * | 2000-09-05 | 2002-03-22 | Hitachi Ltd | Optical multiplex transmission method, optical network, and optical transmission device |
| JP2002261697A (en) * | 2001-03-05 | 2002-09-13 | Nippon Telegr & Teleph Corp <Ntt> | Optical transmission system and wavelength converter |
| US7120360B2 (en) | 2005-01-06 | 2006-10-10 | Fujitsu Limited | System and method for protecting traffic in a hubbed optical ring network |
| US7184663B2 (en) | 2002-05-29 | 2007-02-27 | Fujitsu Limited | Optical ring network with hub node and method |
| US7283740B2 (en) | 2002-05-29 | 2007-10-16 | Fujitsu Limited | Optical ring network with optical subnets and method |
| US7283739B2 (en) | 2002-05-29 | 2007-10-16 | Fujitsu Limited | Multiple subnets in an optical ring network and method |
| US7321729B2 (en) | 2003-05-29 | 2008-01-22 | Fujitsu Limited | Optical ring network with selective signal regeneration and wavelength conversion |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55165049A (en) * | 1979-06-11 | 1980-12-23 | Fujitsu Ltd | Loop network system of wavelength multiplex |
| JPS56111336A (en) * | 1980-02-08 | 1981-09-03 | Toshiba Corp | Wavelength multiplex loop communication system |
-
1988
- 1988-11-22 JP JP63294937A patent/JP2824982B2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55165049A (en) * | 1979-06-11 | 1980-12-23 | Fujitsu Ltd | Loop network system of wavelength multiplex |
| JPS56111336A (en) * | 1980-02-08 | 1981-09-03 | Toshiba Corp | Wavelength multiplex loop communication system |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04213928A (en) * | 1990-12-12 | 1992-08-05 | Nec Corp | Optical repeater |
| EP0501946A3 (en) * | 1991-03-01 | 1993-02-03 | Alcatel Austria Aktiengesellschaft | Optical communication system for bidirectional transmission between an exchange and a plurality of subscribers |
| JP2001028567A (en) * | 1999-07-14 | 2001-01-30 | Furukawa Electric Co Ltd:The | Optical wavelength conversion device and optical communication system |
| JP2002084259A (en) * | 2000-09-05 | 2002-03-22 | Hitachi Ltd | Optical multiplex transmission method, optical network, and optical transmission device |
| JP2002261697A (en) * | 2001-03-05 | 2002-09-13 | Nippon Telegr & Teleph Corp <Ntt> | Optical transmission system and wavelength converter |
| US7184663B2 (en) | 2002-05-29 | 2007-02-27 | Fujitsu Limited | Optical ring network with hub node and method |
| US7283740B2 (en) | 2002-05-29 | 2007-10-16 | Fujitsu Limited | Optical ring network with optical subnets and method |
| US7283739B2 (en) | 2002-05-29 | 2007-10-16 | Fujitsu Limited | Multiple subnets in an optical ring network and method |
| US7321729B2 (en) | 2003-05-29 | 2008-01-22 | Fujitsu Limited | Optical ring network with selective signal regeneration and wavelength conversion |
| US7120360B2 (en) | 2005-01-06 | 2006-10-10 | Fujitsu Limited | System and method for protecting traffic in a hubbed optical ring network |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2824982B2 (en) | 1998-11-18 |
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