JP5387311B2 - Wavelength multiplexed optical network system and wavelength multiplexed optical transmission / reception method - Google Patents
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本発明は波長多重光ネットワークシステム及び波長多重光の送受信方法に係り、特に、３局以上の複数局を含む波長多重光ネットワークシステムの各々の局において、当該局用の波長（または波長帯）以外の波長（または波長帯）の信号は受信できないようにする機能（即ち、波長セキュリティ機能）を高めた波長多重光ネットワークシステム及び波長多重光の送受信方法に関する。 The present invention relates to a wavelength multiplexing optical network system and a wavelength multiplexing optical transmission / reception method, and in particular, in each station of a wavelength multiplexing optical network system including a plurality of stations of three or more stations, other than the wavelength (or wavelength band) for the station. The present invention relates to a wavelength division multiplexed optical network system and a wavelength division multiplexed light transmission / reception method in which a function (that is, a wavelength security function) that prevents reception of a signal of a wavelength (or wavelength band) of the wavelength is increased.
近年、波長多重光伝送を担う波長多重光ネットワークシステムの分野では、局数が３局以上の複数局である場合の光ネットワークシステムとして、光のＡｄｄ／Ｄｒｏｐ機能（ＯＡＤＭ）を有する波長分岐装置を使用する光ネットワークシステムが提案されている。
しかしながら、既成の波長多重光ネットワークシステムでは、これを用いて海底ケーブルシステムのような多国間を結ぶ通信を行う場合において、盗聴防止等のセキャリティ対策上の課題が残されている。
2. Description of the Related Art In recent years, in the field of wavelength division multiplexing optical network systems that handle wavelength division multiplexing optical transmission, a wavelength branching device having an optical Add / Drop function (OADM) is used as an optical network system when there are a plurality of stations having three or more stations. An optical network system to be used has been proposed.
However, in the existing wavelength division multiplexing optical network system, there are still problems in security measures such as eavesdropping prevention when performing communication connecting multiple countries such as a submarine cable system.
海底ケーブルシステムのような多国籍のコンソーシアムからなる巨大プロジェクトにおいては、互いに友好関係にない国同士が参加するプロジェクトも存在するので、通信情報の漏話は大問題となる。これまでのファイバ分岐型の分岐装置では、実際の伝送路が異なるものであったために特に問題は生じていなかったが、これからの波長分岐機能を有する分岐装置を備えた波長多重光信号の受信装置を含む波長多重光ネットワークシステムでは、通信情報の漏話が危惧され、重大な問題点として浮上してきているので、この点の解決を含むセキュリティ対策が重要な課題となっている。 In a huge project consisting of a multinational consortium such as a submarine cable system, there are also projects in which countries that are not friendly to each other participate, so crosstalk of communication information becomes a big problem. In the conventional fiber branching type branching device, there was no particular problem because the actual transmission path was different, but the wavelength multiplexed optical signal receiving device provided with a branching device having a future wavelength branching function In the wavelength division multiplexing optical network system including, crosstalk of communication information is feared and has emerged as a serious problem, and security measures including the solution of this point is an important issue.
この分野の既成技術として、例えば、特許文献１には、ＡＳＥ光源から出力された広帯域波長成分を含む自然光を、光カプセラに入力してｎ個の自然光に分岐すると共に、この分岐された自然光を狭帯域バンドパスフィルターを介して得られる光を、必要に応じて光増幅器で光増幅する技術、及びＡＯＴＦに波長λ１〜λｎの波長多重光信号を入力し、８種類の波長の光信号にアッド／ドロップすると共に各波長の光信号を電気ＡＤＭ（光信号受信器）に送出する技術が提案されている。
また、特許文献２には、光信号を光アンプによって増幅した後、波長選択フィルタを備えた光カプセラを用いて、ドロップされてきた光信号を波長の数だけ分岐する技術が開示されている。
As an existing technology in this field, for example, Patent Document 1 discloses that natural light including a broadband wavelength component output from an ASE light source is input to an optical Capsera and branched into n natural lights. A technology that amplifies the light obtained through the narrow band pass filter with an optical amplifier as needed, and a wavelength multiplexed optical signal with wavelengths λ1 to λn is input to the AOTF, and added to optical signals of 8 types of wavelengths. A technique for transmitting / dropping an optical signal of each wavelength to an electric ADM (optical signal receiver) has been proposed.
また、特許文献３には、ＥＤＦＡ増幅器回路に入力するパワー信号のレベルを監視する構成において、ダミーレーザの出力を前記のＥＤＦＡ増幅器回路することと、このダミーレーザの出力パワーが所定の利得またはパワーレベルになるように制御することと、分岐ポートから出力された信号光は、各々対応する受信器で受信処理することが開示されている。
さらに、特許文献４には、信号光を、光分岐部の光アンプに送出し、所要のパワーまで増幅した後、カプラに送出してＭ個の信号光に分岐し、波長選択用ＡＯＴＦに送出する技術が開示されている。
Further, in Patent Document 3, in the configuration in which the level of the power signal input to the EDFA amplifier circuit is monitored, the output of the dummy laser is the EDFA amplifier circuit, and the output power of the dummy laser is a predetermined gain or power. It is disclosed that the signal level is controlled to be level and that the signal light output from the branch port is received and processed by the corresponding receiver.
Further, in Patent Document 4, signal light is sent to an optical amplifier in an optical branching unit, amplified to a required power, then sent to a coupler, branched into M signal lights, and sent to a wavelength selection AOTF. Techniques to do this are disclosed.
しかしながら、上記背景技術で述べた従来の波長多重光ネットワークシステム及び波長多重光信号の受信装置並びに光信号の波長多重化方法にあっては、前述のとおり、波長多重光伝送の多波長化に伴い、３局以上の複数局を含む光ネットワークシステムにおいて、光信号のＡｄｄ／Ｄｒｏｐ機能（ＯＡＤＭ）を有する波長分岐装置を使用する光ネットワークシステムが提案されてはいるが、これまでのファイバ分岐装置とは異なり、複数波長を有する光信号のＡｄｄ／Ｄｒｏｐであるため、本来は送信する必要の無い他局用の波長帯の信号までもが各端局装置に伝送されてしまうことによる漏話の危険性を有しており、セキュリティ対策上の問題点が有る。
特に、海底ケーブルシステムのような多国間を結ぶ通信の場合、盗聴の危険性が有り、国家の安全対策上からも好ましくない。
However, in the conventional wavelength multiplexing optical network system, wavelength multiplexing optical signal receiving apparatus, and optical signal wavelength multiplexing method described in the above background art, as described above, with the increase of wavelength multiplexing of wavelength multiplexing optical transmission, In an optical network system including three or more stations, an optical network system using a wavelength branching device having an Add / Drop function (OADM) of an optical signal has been proposed. In contrast, because it is an Add / Drop of an optical signal having a plurality of wavelengths, there is a risk of crosstalk due to transmission of signals in a wavelength band for other stations that are not originally required to be transmitted to each terminal device. There are problems with security measures.
In particular, in the case of communication between multiple countries such as a submarine cable system, there is a risk of eavesdropping, which is not preferable in terms of national safety measures.
この分野における既成の技術と本発明の技術とを比較すると、まず、本発明は、
（１） 複数の端局装置を相互に接続する波長多重光ネットワークシステムにおいて、入力信号を分岐する分岐装置と、分岐装置と端局との間に設置される増幅器と、増幅器から端局装置までの間に、他の経路の信号を遮断するフィルタと、を備える構成とし、
（２） 前記の（１）に示す構成において、増幅器に入力されるトータルパワーが一定になるように、各端局装置は未使用の通信波長帯でダミー信号を送信する、
ことを骨子としている。
When comparing the existing technology in this field with the technology of the present invention, first, the present invention
(1) In a wavelength multiplexing optical network system in which a plurality of terminal devices are connected to each other, a branching device that branches an input signal, an amplifier installed between the branching device and the terminal station, and from the amplifier to the terminal device And a filter that cuts off signals of other paths,
(2) In the configuration shown in (1) above, each terminal device transmits a dummy signal in an unused communication wavelength band so that the total power input to the amplifier is constant.
The point is that.
これに対し、前述の特許文献２及び特許文献４には、各々、（１）に示す入力信号を分岐する分岐装置、及び他の経路の信号を遮断するフィルタと、同様の構成要素の記載が有る。但し、ここでは、用語の対応として、これらの文献に記載の「受信器」を、発明の「端局装置」に置き換え、さらに「増幅器の配置」を、（１）に示す「光分岐器と端局との間に設置された増幅器」に置き換えて類似性を判断している。
On the other hand, in the above-mentioned
また、前述の特許文献１には、（１）に示す入力信号を分岐する分岐装置、及び他の経路の信号を遮断するフィルタの記載が有り、また、分岐装置と端局装置との間に設置される増幅器と同様の記載が有る。但し、ここでは、用語の対応として、特許文献１に記載の「増幅器の配置」を、（１）に示す分岐装置と端局との間に設置される増幅器要素ｃに置き換えて類似性を判断している。また、特許文献１には、「伝送路による光の伝送先に端局を設ける」ことを示す具体的な記載はないが、（１）に示す発明の構成と実質的には同一であると見なせる。さらに、特許文献３には、前記の（２）と同様の記載が有る。
しかしながら、上記の類似性は、部分的かつ断片的なものに過ぎず、全体を通した組み合わせでは、本発明内容と同一とは言えない。
Further, the above-mentioned Patent Document 1 includes a description of a branching device that branches the input signal shown in (1) and a filter that cuts off signals of other paths, and between the branching device and the terminal device. There is a description similar to the installed amplifier. However, here, as the correspondence of terms, the similarity is determined by replacing the “arrangement of amplifiers” described in Patent Document 1 with the amplifier element c installed between the branching device and the terminal station shown in (1). doing. Further, Patent Document 1 does not have a specific description indicating that “a terminal station is provided at a transmission destination of light by a transmission path”, but is substantially the same as the configuration of the invention shown in (1). Can be considered. Further, Patent Document 3 has the same description as (2) above.
However, the above-mentioned similarity is only partial and fragmentary, and it cannot be said that the whole combination is the same as the content of the present invention.
本発明は、上記既成の波長多重光ネットワークシステムの問題点に鑑みてなされたものであって、ケーブル区間に、必要のない波長を遮断するフィルタを具備することを可能にして、信号波長のセキュリティ機能を有する波長多重光ネットワークシステム及び波長多重光の送受信方法を提供することを目的としている。 The present invention has been made in view of the problems of the above-described existing wavelength division multiplexing optical network system, and it is possible to provide a filter for blocking unnecessary wavelengths in a cable section, thereby providing signal wavelength security. It is an object of the present invention to provide a wavelength division multiplexing optical network system having a function and a wavelength division multiplexed light transmission / reception method.
上記課題を解決するために、本発明に係る波長多重光ネットワークシステムは、第１の端局装置と、前記端局装置に接続された分岐装置と、前記端局装置と前記分岐装置を介して接続された複数の第２の端局装置と、前記第１及び第２の端局装置の各々の前段に配置された中継器とを有する波長多重光ネットワークシステムであって、前記複数の第２の端局装置の各々と前記中継器との間に遮断器を備え、さらに、前記第１の端局装置からは、前記複数の第２の端局装置の各々に対応した波長帯全ての送信信号を重ねた送信信号を送信する手段と、前記複数の第２の端局装置の各々からは、自局に対応した波長帯の送信信号と、自局を除く他の前記複数の第２の端局装置の各々に対応した波長帯全てのダミーの送信信号とを重ねた送信信号を送信する手段と、を備えたことを特徴とする。 In order to solve the above problems, a wavelength division multiplexing optical network system according to the present invention includes a first terminal device, a branch device connected to the terminal device, the terminal device and the branch device. A wavelength division multiplexing optical network system comprising a plurality of second terminal devices connected to each other and a repeater disposed in a preceding stage of each of the first and second terminal devices, wherein the plurality of second terminal devices A circuit breaker is provided between each of the terminal devices and the repeater, and the first terminal device transmits all of the wavelength bands corresponding to each of the plurality of second terminal devices. Means for transmitting a transmission signal in which signals are superimposed, and a transmission signal in a wavelength band corresponding to the own station from each of the plurality of second terminal devices, and the plurality of second terminals other than the own station. A transmission signal in which dummy transmission signals in all wavelength bands corresponding to each terminal device are superimposed Characterized by comprising means for signal, a.
また、本発明に係る波長多重光の送受信方法は、第１の端局装置と、前記端局装置に接続された分岐装置と、前記端局装置と前記分岐装置を介して接続された複数の第２の端局装置と、前記第１及び第２の端局装置の各々の前段に配置された中継器とを有する波長多重光ネットワークシステムにおける波長多重光の送受信方法であって、前記複数の第２の端局装置の各々と前記中継器との間に遮断器を設置するステップと、前記第１の端局装置からは、前記複数の第２の端局装置の各々に対応した波長帯全ての送信信号を重ねた送信信号を送信するステップと、前記複数の第２の端局装置の各々からは、自局に対応した波長帯の送信信号と、自局を除く他の前記複数の第２の端局装置の各々に対応した波長帯全てのダミーの送信信号とを重ねた送信信号を送信するステップと、を有することを特徴とする。 In addition, the wavelength division multiplexed light transmission / reception method according to the present invention includes a first terminal device, a branch device connected to the terminal device, and a plurality of devices connected to the terminal device via the branch device. A wavelength-multiplexed light transmission / reception method in a wavelength-multiplexed optical network system, comprising: a second terminal device; and a repeater disposed in front of each of the first and second terminal devices, A step of installing a circuit breaker between each of the second terminal devices and the repeater; and a wavelength band corresponding to each of the plurality of second terminal devices from the first terminal device. A step of transmitting a transmission signal in which all transmission signals are superimposed; and from each of the plurality of second terminal devices, a transmission signal of a wavelength band corresponding to the own station, and the plurality of other than the own station Overlapping dummy transmission signals in all wavelength bands corresponding to each of the second terminal devices And having the steps of: transmitting a transmit signal.
以上説明したように、本発明の波長多重光ネットワークシステムによれば、分岐装置により分岐された伝送路に接続される端局装置と中継器との間に当該端局装置用の波長帯の信号のみをパスさせる遮断機を設け、分岐前の伝送路に接続された端局装置からは全波長帯の信号を送信し、分岐後の伝送路に接続された端局装置からは自局に対応した波長帯の送信信号と、自局を除く他の端局装置の各々に対応した波長帯全てのダミーの送信信号とを重ねて送信することにより、信号波長のセキュリティ機能を有する波長多重光ネットワークシステムを提供することができる効果がある。 As described above, according to the wavelength division multiplexing optical network system of the present invention, the signal in the wavelength band for the terminal device is connected between the terminal device connected to the transmission line branched by the branching device and the repeater. A terminal is connected to the transmission path before branching, and all the wavelength band signals are transmitted from the terminal station connected to the transmission path before branching, and the terminal station connected to the transmission path after branching supports the local station. Wavelength-multiplexed optical network having a signal wavelength security function by superimposing and transmitting a transmission signal in the wavelength band and a dummy transmission signal in all wavelength bands corresponding to each of the other terminal stations other than the local station. There is an effect that a system can be provided.
以下、本発明の波長多重光ネットワークシステムの実施形態について、図面を参照して詳細に説明する。
図１は、本発明の実施形態に係る波長多重光ネットワークシステムの全体構成を示す構成図である。
同図において、本実施形態の波長多重光ネットワークシステムは、波長分岐を含む波長多重光ネットワークシステムであり、遮断フィルタ１，２と、端局装置Ａ，Ｂ，Ｃと、中継器Ｅ（１〜８）と、分岐装置Ｄと、を備える。
Embodiments of a wavelength division multiplexing optical network system according to the present invention will be described below in detail with reference to the drawings.
FIG. 1 is a configuration diagram showing the overall configuration of a wavelength division multiplexing optical network system according to an embodiment of the present invention.
In the figure, the wavelength division multiplexing optical network system of the present embodiment is a wavelength division multiplexing optical network system including wavelength branching, and includes
端局装置Ａ，Ｂ，Ｃは、例えば、それぞれ異なる国に設置される端局装置である。ここでは、端局装置ＡはＡ国、端局装置ＢはＢ国、端局装置ＣはＣ国に、それぞれ設置されるものとし、Ａ国−Ｂ国間ではＬ帯の波長帯で通信し、Ａ国−Ｃ国間ではＳ帯の波長帯で通信するものとする。
以下、図１に示す本実施形態の波長多重光ネットワークシステムの機能を説明する。
端局装置Ａは、他の端局装置Ｂ，Ｃと通信するために、Ｓ帯とＬ帯の両方の信号帯に信号を送信する。端局装置Ａから出た送信信号は、分岐装置Ｄにより、２分岐され、端局装置Ｂ及び端局装置Ｃへと伝送される。このとき、当然ながら、Ｓ帯とＬ帯の両方の送信信号が端局装置Ｂ及び端局装置Ｃへと伝送されることになる。
The terminal device A, B, C is, for example, a terminal device installed in different countries. Here, the terminal device A is installed in the country A, the terminal device B is installed in the country B, the terminal device C is installed in the country C, and the communication between the countries A and B is performed in the L-band wavelength band. Suppose that communication is performed in the S-band wavelength band between countries A and C.
Hereinafter, functions of the wavelength division multiplexing optical network system of the present embodiment shown in FIG. 1 will be described.
In order to communicate with the other terminal station devices B and C, the terminal device A transmits signals to both the S band and the L band signal bands. A transmission signal output from the terminal device A is branched into two by the branch device D and transmitted to the terminal device B and the terminal device C. At this time, naturally, both S-band and L-band transmission signals are transmitted to the terminal device B and the terminal device C.
しかし、この伝送は、通常、該波長多重光ネットワーク内に存在する中継器Ｅ（１〜８）の存在により、制限される。即ち、通常、海底ケーブルシステムのような長期間のシステム動作を補償する中継器には、ＡＰＣ制御したＥＤＦＡが使用されており、中継器Ｅ（１〜８）も、このようなタイプの中継器である。この中継器Ｅ（１〜８）はトータルの信号パワーで動作する仕様であるため、分岐装置Ｄの前後で波長数が変わってしまうと正常動作しなくなる。このため、端局装置Ａから出た信号は、分岐装置ＤではＳ帯とＬ帯とに分けることなく、そのまま端局装置Ｂ及び端局装置Ａに向けて分岐している。 However, this transmission is usually limited by the presence of a repeater E (1-8) present in the wavelength division multiplexing optical network. That is, an APC-controlled EDFA is normally used for a repeater that compensates for a long-term system operation such as a submarine cable system, and the repeater E (1-8) is also a repeater of this type. It is. Since the repeaters E (1 to 8) are designed to operate with the total signal power, if the number of wavelengths changes before and after the branching device D, the repeaters E (1 to 8) do not operate normally. For this reason, the signal output from the terminal device A is branched as it is toward the terminal device B and the terminal device A without being divided into the S band and the L band in the branching device D.
このため、端局装置Ａと端局装置Ｂとの間、及び端局装置Ａと端局装置Ｃとの間では、所定の任意の波長（または波長帯）以外の波長の信号も受信可能な状態となり、特に、分岐装置Ｄと端局装置Ｂとの間、及び分岐装置Ｄと端局装置Ｃとの間では、本来は保証されるべき波長セキュリティ機能が保証されなくなる。
もっとも、波長数（または波長帯）に応じた信号パワーで動作するものとして中継器Ｅ（１〜８）を設計することも可能であるが、その場合は、端局装置Ａ−分岐装置Ｄ間、端局装置Ｂ−分岐装置Ｄ間、端局装置Ｃ−分岐装置Ｄ間の、計３通りの区間を中継する中継器を設計することになり、コスト高になる。
Therefore, a signal having a wavelength other than a predetermined arbitrary wavelength (or wavelength band) can be received between the terminal device A and the terminal device B and between the terminal device A and the terminal device C. In particular, between the branch device D and the terminal device B, and between the branch device D and the terminal device C, the wavelength security function that should originally be guaranteed is not guaranteed.
Of course, it is possible to design the repeater E (1 to 8) as one that operates with signal power corresponding to the number of wavelengths (or wavelength band), but in that case, between the terminal device A and the branch device D Therefore, it is necessary to design a repeater that relays a total of three sections between the terminal station device B and the branching device D and between the terminal station device C and the branching device D, which increases the cost.
よって、本実施形態に係る波長多重光ネットワークシステムでは、端局装置Ａから出た送信信号は、端局装置Ｂに到達する前に、Ｓ帯（またはＬ帯）を遮断する遮断フィルタ１を通過させ、また、端局装置Ｃに到達する前に、Ｓ帯（またはＬ帯）を遮断する遮断フィルタ２を通過させ、これにより、端局装置Ｂ，Ｃには、Ｌ帯（またはＳ帯）の送信信号のみを伝送する。
Therefore, in the wavelength division multiplexing optical network system according to the present embodiment, the transmission signal output from the terminal device A passes through the cutoff filter 1 that blocks the S band (or L band) before reaching the terminal device B. In addition, before reaching the terminal device C, it passes through the
他方、端局装置Ｂ（または端局装置Ｃ）は、端局装置Ａと通信するために、Ｌ帯（またはＳ帯）の信号帯に送信信号を送信すると共に、該送信信号に併せてＳ帯（またはＬ帯）にダミー信号を送信する。
このダミー信号のパワーは、前述の仕様を有する中継器Ｅ（１〜８）を安定動作させるため、ダミー信号としては使用していない側（即ち送信信号）の信号帯（即ちＬ帯（またはＳ帯））と同じパワーとし、これにより中継器Ｅ（１〜８）を安定動作させるために必要なトータルパワー分を保証するものとする。
On the other hand, the terminal station apparatus B (or terminal station apparatus C) transmits a transmission signal in the signal band of the L band (or S band) and communicates with the transmission signal in order to communicate with the terminal station apparatus A. A dummy signal is transmitted to the band (or L band).
The power of the dummy signal is used to stably operate the repeaters E (1 to 8) having the above-described specifications, so that the signal band (that is, the transmission signal) on the side that is not used as the dummy signal (that is, the transmission band) is used. The power is the same as that of the band)), and thereby, the total power necessary for stable operation of the repeater E (1-8) is guaranteed.
端局装置Ｂ（または端局装置Ｃ）から出た送信信号は、分岐装置Ｄにより、ダミー信号が乗っているＳ帯（またはＬ帯）が遮断され、端局装置Ｃ（または端局装置Ｂ）から来た信号と合波されて、端局装置Ａへ送られる。
これにより、端局装置Ａ−端局装置Ｂ間、及び端局装置Ａ−端局装置Ｃ間の、情報漏洩の防止が可能な双方向通信が可能になる。
この実施形態に係る波長多重光ネットワークシステムでは、前述のとおり、端局装置Ｂと、その前段に配置された中継器Ｅ５との間に遮断フィルタ１を挿入し、また、端局装置Ａと、その前段に配置された中継器Ｅ８との間に遮断フィルタ２を挿入するだけで、信号波長のセキュリティを確保した光ネットワークシステムを提供することができる効果が有る。
The transmission signal output from the terminal device B (or terminal device C) is blocked by the branching device D from the S band (or L band) on which the dummy signal is carried, and the terminal device C (or terminal device B). ) Is combined with the signal coming from and sent to the terminal device A.
Thereby, bidirectional communication capable of preventing information leakage between the terminal station device A and the terminal station device B and between the terminal station device A and the terminal station device C becomes possible.
In the wavelength division multiplexing optical network system according to this embodiment, as described above, the cutoff filter 1 is inserted between the terminal device B and the repeater E5 arranged in the preceding stage, and the terminal device A, There is an effect that it is possible to provide an optical network system in which the security of the signal wavelength is ensured only by inserting the
（他の実施の形態）
遮断フィルタＤは、端局装置の受信側と直近の中継器出力との間でありさえすれば、何処にでも設置可能であるから、例えば、中継器Ｅ（１〜８）のいずれかの出力端に設置することも可能であるし、また、海底ケーブルと陸揚げケーブルとを結ぶジョイントボックス内などに設置することも可能である。
(Other embodiments)
Since the cutoff filter D can be installed anywhere as long as it is between the reception side of the terminal device and the nearest repeater output, for example, the output of any one of the repeaters E (1 to 8) It can also be installed at the end, or in a joint box that connects the submarine cable and the landing cable.
本発明は、波長多重光ネットワークシステムの構築に適用可能であり、特に、複数の各々の局において、当該局対応の波長（または波長帯）以外の波長（または波長帯）の信号は受信できないようにする機能（即ち、波長セキュリティ機能）を高めた波長多重光ネットワークシステムの構築に最適である。 The present invention is applicable to the construction of a wavelength division multiplexing optical network system, and in particular, in each of a plurality of stations, signals of wavelengths (or wavelength bands) other than the wavelengths (or wavelength bands) corresponding to the stations cannot be received. It is optimal for the construction of a wavelength division multiplexing optical network system with an enhanced function (ie, wavelength security function).
１，２ 遮断フィルタ
Ａ，Ｂ，Ｃ 端局装置
Ｄ 分岐装置
Ｅ１〜８ 中継器
1, 2 Blocking filter A, B, C Terminal equipment
D branch device E1-8 Repeater
Claims (7)
前記複数の第２の端局装置の各々と前記中継器との間に遮断器を備え、さらに、
前記第１の端局装置からは、前記複数の第２の端局装置の各々に対応した波長帯全ての送信信号を重ねた送信信号を送信する手段と、
前記複数の第２の端局装置の各々からは、自局に対応した波長帯の送信信号と、自局を除く他の前記複数の第２の端局装置の各々に対応した波長帯全てのダミーの送信信号とを重ねた送信信号を送信する手段と、
を備えたことを特徴とする波長多重光ネットワークシステム。 A first terminal device, a branch device connected to the terminal device, a plurality of second terminal devices connected to the terminal device via the branch device, and the first and second A wavelength division multiplexing optical network system having a repeater arranged in a preceding stage of each of the terminal equipments of
A circuit breaker between each of the plurality of second terminal devices and the repeater;
From the first terminal device, means for transmitting a transmission signal in which transmission signals in all wavelength bands corresponding to each of the plurality of second terminal devices are superimposed;
From each of the plurality of second terminal devices, a transmission signal in a wavelength band corresponding to the own station and all of the wavelength bands corresponding to each of the plurality of second terminal devices other than the own station. Means for transmitting a transmission signal superimposed with a dummy transmission signal;
A wavelength division multiplexing optical network system.
前記複数の第２の端局装置の各々と前記中継器との間に遮断器を設置するステップと、
前記第１の端局装置からは、前記複数の第２の端局装置の各々に対応した波長帯全ての送信信号を重ねた送信信号を送信するステップと、
前記複数の第２の端局装置の各々からは、自局に対応した波長帯の送信信号と、自局を除く他の前記複数の第２の端局装置の各々に対応した波長帯全てのダミーの送信信号とを重ねた送信信号を送信するステップと、
を有することを特徴とする波長多重光の送受信方法。 A first terminal device, a branch device connected to the terminal device, a plurality of second terminal devices connected to the terminal device via the branch device, and the first and second A wavelength-multiplexed light transmission / reception method in a wavelength-multiplexed optical network system having a repeater disposed in a preceding stage of each of the terminal devices of
Installing a circuit breaker between each of the plurality of second terminal devices and the repeater;
From the first terminal device, transmitting a transmission signal in which transmission signals in all wavelength bands corresponding to each of the plurality of second terminal devices are superimposed;
From each of the plurality of second terminal devices, a transmission signal in a wavelength band corresponding to the own station and all of the wavelength bands corresponding to each of the plurality of second terminal devices other than the own station. Transmitting a transmission signal superimposed with a dummy transmission signal;
A method for transmitting and receiving wavelength-division multiplexed light.
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