JP2001036477A - Optical label multiplex transmission method - Google Patents
Optical label multiplex transmission methodInfo
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- JP2001036477A JP2001036477A JP20449699A JP20449699A JP2001036477A JP 2001036477 A JP2001036477 A JP 2001036477A JP 20449699 A JP20449699 A JP 20449699A JP 20449699 A JP20449699 A JP 20449699A JP 2001036477 A JP2001036477 A JP 2001036477A
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- optical
- signal
- label
- wavelength
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- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
- Data Exchanges In Wide-Area Networks (AREA)
- Optical Communication System (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、光伝送ネットワー
クの中継装置でルーティングに必要な光信号のアドレス
情報等の制御情報（ラベル）を主信号光に多重して伝送
する光ラベル多重伝送装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical label multiplex transmission apparatus for multiplexing and transmitting control information (label) such as address information of an optical signal required for routing in a relay apparatus of an optical transmission network to a main signal light. .
【０００２】[0002]
【従来の技術】光伝送ネットワークでは、光信号の送信
装置および受信装置に加えて、光信号のアドレス（宛
先）ごとに光信号をルーティングする中継装置が配置さ
れる。従来の中継装置では、受信した光信号からそのヘ
ッダ部分に記述されているアドレス情報を読み取り、そ
れに応じて経路を切り替え、次の中継装置または受信装
置に向けて光信号を送信する。2. Description of the Related Art In an optical transmission network, a relay apparatus for routing an optical signal for each address (destination) of the optical signal is arranged in addition to a transmitting apparatus and a receiving apparatus for the optical signal. In a conventional relay device, address information described in a header portion of the received optical signal is read, the path is switched according to the read information, and the optical signal is transmitted to the next relay device or receiving device.
【０００３】図４は、従来の中継装置の構成例を示す。
図において、中継装置に到達した光信号は光電気変換器
（Ｏ／Ｅ）４１で電気信号に変換され、復調器４２で復
調された後にヘッダ分離装置４３に入力される。ヘッダ
分離装置４３では、電気信号のヘッダ部分に記述された
アドレス情報を読み取って経路制御器４４に出力すると
ともに、電気信号（主信号）を経路切替器４５に出力す
る。経路制御器４４は、アドレス情報に応じて経路切替
器４５を制御し、電気信号（主信号）の経路を切り替え
て対応する電気光変換器（Ｅ／Ｏ）４６に出力する。光
電気変換器４６では、電気信号（主信号）を光信号に変
換して対応する宛先に送信する。FIG. 4 shows a configuration example of a conventional relay device.
In the figure, an optical signal arriving at a relay device is converted into an electric signal by an optical-electrical converter (O / E) 41, demodulated by a demodulator 42, and then input to a header separation device 43. The header separation device 43 reads the address information described in the header portion of the electric signal and outputs the read address information to the path controller 44, and outputs the electric signal (main signal) to the path switch 45. The path controller 44 controls the path switch 45 according to the address information, switches the path of the electric signal (main signal), and outputs it to the corresponding electro-optical converter (E / O) 46. The opto-electric converter 46 converts the electric signal (main signal) into an optical signal and transmits it to a corresponding destination.
【０００４】このような中継装置では光信号が一旦電気
信号に変換されるので、中継装置内の電気処理速度によ
ってネットワーク全体の伝送速度が制限されることにな
る。特に、光波長多重伝送の場合には、中継装置内で上
記の電気処理を多重された各波長チャネル対応に行われ
なければらなず、一チャネル当たりの電気処理速度はま
すます低下する。In such a relay device, since the optical signal is once converted into an electric signal, the transmission speed of the entire network is limited by the electric processing speed in the relay device. In particular, in the case of optical wavelength division multiplexing transmission, the above electric processing must be performed for each multiplexed wavelength channel in the repeater, and the electric processing speed per channel is further reduced.
【０００５】これに対処するために、光ラベルスイッチ
ング方式が提案されている。光ラベルスイッチング方式
とは、ヘッダ部分に記述されるアドレス情報、すなわち
ラベルを光信号に折り込むようにして重畳し、中継装置
では光信号からラベルのみを抽出して経路切り替え制御
を行い、光信号を電気信号に変換することなく光のまま
で中継する方式である。光ラベルスイッチング方式に用
いる光信号は、例えば図５に示すように、ディジタル強
度変調された光信号に、そのディジタル強度変調データ
レートよりも高い周波数で変調されたラベルを重畳する
ものである。[0005] To cope with this, an optical label switching system has been proposed. With the optical label switching method, address information described in the header portion, that is, the label is superimposed on the optical signal so as to be folded, and the relay device extracts only the label from the optical signal to perform path switching control, and performs switching of the optical signal. This is a system in which light is relayed as it is without conversion into an electric signal. The optical signal used in the optical label switching system is, for example, as shown in FIG. 5, a label modulated at a frequency higher than the digital intensity modulation data rate on a digital intensity modulated optical signal.
【０００６】図６は、光ラベルスイッチング方式で用い
る中継装置の構成例を示す。図において、中継装置に到
達した光信号は光分岐器５１で２分岐され、その一方が
高周波検出器５２に入力され、他方が遅延光回路５６に
入力される。高周波検出器５２では、光信号から周波数
の高いラベルのみを電気信号に変換して抽出し、復調器
５３で復調したアドレス情報（ラベル）を経路制御器５
４に入力する。経路制御器５４では、復調されたアドレ
ス情報をもとに経路を決定し、光経路切替器５５を制御
して光経路を切り替える。光分岐器５１で分岐された他
方の光信号は、遅延光回路５６で以上の処理遅延が吸収
され、光経路切替器５５で切り替えられた光経路に送信
される。FIG. 6 shows an example of the configuration of a repeater used in the optical label switching system. In the figure, an optical signal arriving at a repeater is split into two by an optical splitter 51, one of which is input to a high-frequency detector 52, and the other is input to a delay optical circuit 56. The high-frequency detector 52 converts only the high-frequency label from the optical signal into an electric signal and extracts the electric signal, and outputs the address information (label) demodulated by the demodulator 53 to the path controller 5.
Enter 4 The path controller 54 determines a path based on the demodulated address information and controls the optical path switch 55 to switch the optical path. The other optical signal split by the optical splitter 51 absorbs the above processing delay in the delay optical circuit 56 and is transmitted to the optical path switched by the optical path switch 55.
【０００７】このような中継装置では、電気処理はラベ
ルに対してのみ行い、光信号は電気信号に変換されずに
そのまま目的の宛先に中継される。したがって、光信号
を一旦電気信号に変換する図４の中継装置に比べて、中
継装置の電気処理への負担はそれほど大きくない。In such a relay device, the electrical processing is performed only on the label, and the optical signal is relayed to a target destination without being converted into an electrical signal. Therefore, the burden on the electrical processing of the relay device is not so large as compared with the relay device of FIG. 4 that temporarily converts the optical signal into the electric signal.
【０００８】[0008]
【発明が解決しようとする課題】ところで、従来の光ラ
ベルスイッチング方式は、主信号光の変調周波数よりラ
ベルの変調周波数が高くなっているので、伝送容量増大
のために主信号光の変調周波数を高くすると、ラベルの
変調周波数もそれ以上に高くしなければならない。しか
し、高周波検出器５２や復調器５３が電気回路であるの
で、ラベルの変調周波数を無制限に高くすることはでき
ない。すなわち、主信号光のデータレートを増大させる
と、中継装置においてラベル抽出に必要な電気処理が困
難になる問題があった。In the conventional optical label switching method, the modulation frequency of the label is higher than the modulation frequency of the main signal light. Therefore, the modulation frequency of the main signal light is increased to increase the transmission capacity. If it is higher, the modulation frequency of the label must be even higher. However, since the high-frequency detector 52 and the demodulator 53 are electric circuits, the label modulation frequency cannot be increased without limit. That is, when the data rate of the main signal light is increased, there is a problem that electrical processing required for label extraction in the relay device becomes difficult.
【０００９】本発明は、主信号光のアドレス情報等の制
御情報（ラベル）を主信号光に多重して伝送する光ラベ
ル多重伝送装置において、主信号光とラベルの変調周波
数を独立に選ぶことができ、中継装置で主信号光のデー
タレートに関わらず容易にラベルを抽出することができ
る光ラベル多重伝送装置を提供することを目的とする。According to the present invention, an optical label multiplex transmission apparatus for multiplexing and transmitting control information (label) such as address information of a main signal light to a main signal light, independently selecting modulation frequencies of the main signal light and the label. It is an object of the present invention to provide an optical label multiplex transmission apparatus capable of easily extracting a label irrespective of the data rate of the main signal light in the relay apparatus.
【００１０】[0010]
【課題を解決するための手段】請求項１に記載の光ラベ
ル多重伝送装置は、所定の波長の光信号を２分岐する光
分岐手段と、光分岐手段で分岐された一方の光信号の波
長を制御情報（ラベル）をのせた低速信号で変調する光
変調手段と、光分岐手段で分岐された他方の光信号と光
変調手段から出力された光信号とを合波する光合波器と
を備え、所定の波長の光信号から分岐された各光信号の
波長差を低速信号により変調する。According to a first aspect of the present invention, there is provided an optical label multiplex transmission apparatus, comprising: an optical splitter for splitting an optical signal having a predetermined wavelength into two; and a wavelength of one of the optical signals split by the optical splitter. Modulation means for modulating the optical signal with a low-speed signal carrying control information (label), and an optical multiplexer for multiplexing the other optical signal split by the optical splitting means and the optical signal output from the optical modulation means. And modulates a wavelength difference of each optical signal branched from an optical signal of a predetermined wavelength by a low-speed signal.
【００１１】請求項２に記載の光ラベル多重伝送装置
は、所定の波長の光信号をｎ分岐（ｎは３以上の整数）
する光分岐手段と、光分岐手段で分岐されたｎ−１個の
光信号の波長をそれぞれ異なる制御情報（ラベル）をの
せた低速信号で変調するｎ−１個の光変調手段と、光分
岐手段で分岐された１つの光信号と各光変調手段から出
力された光信号とを合波する光合波器とを備え、所定の
波長の光信号から分岐された各光信号の波長差をｎ−１
個の低速信号によりそれぞれ変調する。In the optical label multiplex transmission apparatus according to the present invention, an optical signal having a predetermined wavelength is branched into n (n is an integer of 3 or more).
Optical branching means for performing the optical splitting, n-1 optical modulating means for modulating the wavelengths of the n-1 optical signals branched by the optical splitting means with low-speed signals carrying different control information (labels), And an optical multiplexer for multiplexing one optical signal branched by the means and an optical signal output from each optical modulation means, wherein the wavelength difference between the optical signals branched from the optical signal having a predetermined wavelength is n -1
Each of the low-speed signals is modulated.
【００１２】ここで、所定の波長の光信号が伝送データ
により強度変調されて光分岐手段に入力される構成（請
求項３）、光合波器から出力される光信号が伝送データ
により強度変調されて出力される構成（請求項４）、光
分岐器で分岐された１つの光信号が伝送データにより強
度変調されて光合波器に入力される構成（請求項５）に
より、伝送データにより変調された光信号を生成する。
また、光変調手段は、光信号の波長を制御情報（ラベ
ル）をのせた低速信号で周波数変調する音響光学素子を
用いる（請求項６）。Here, an optical signal of a predetermined wavelength is intensity-modulated by transmission data and input to the optical branching means (claim 3), and an optical signal output from the optical multiplexer is intensity-modulated by transmission data. In the configuration (claim 4), one optical signal split by the optical splitter is intensity-modulated by transmission data and input to the optical multiplexer (claim 5). To generate an optical signal.
Further, the light modulating means uses an acousto-optical element for frequency-modulating the wavelength of the optical signal with a low-speed signal carrying control information (label).
【００１３】受信側で低速信号を検波する検波手段は、
波長差が低速信号により変調された光信号を入力し、二
乗検波して制御情報（ラベル）をのせた低速信号を出力
する。The detecting means for detecting the low-speed signal on the receiving side includes:
An optical signal whose wavelength difference is modulated by a low-speed signal is input, square-detected, and a low-speed signal with control information (label) is output.
【００１４】[0014]
【発明の実施の形態】図１は、本発明の光ラベル多重伝
送装置における光変調器の構成例を示す。図において、
光源１１から出力された波長λのＣＷ光は、光強度変調
器１２で例えば10Ｇbps のディジタル信号（データ）に
より強度変調され、強度変調信号光（以下「主信号光」
という）に変換される。この主信号光は光分岐器１３で
２分岐され、その一方の主信号光Ａが光周波数シフタと
して機能する音響光学素子（ＡＯＭ）１４に入力され
る。光分岐器１３で分岐された他方の主信号光Ｂと音響
光学素子１４の出力光が光合波器１５で合波される。FIG. 1 shows an example of the configuration of an optical modulator in an optical label multiplex transmission apparatus according to the present invention. In the figure,
The CW light having a wavelength λ output from the light source 11 is intensity-modulated by a digital signal (data) of, for example, 10 Gbps in the light intensity modulator 12 and is intensity-modulated signal light (hereinafter, “main signal light”).
Is converted to The main signal light is split into two by an optical splitter 13, and one of the main signal lights A is input to an acousto-optic device (AOM) 14 functioning as an optical frequency shifter. The other main signal light B split by the optical splitter 13 and the output light of the acousto-optic element 14 are multiplexed by the optical multiplexer 15.
【００１５】ここで、主信号光の制御情報（ラベル）
は、例えば10ＭHzを中心にした周波数変調信号として音
響光学素子１４に印加される。音響光学素子１４は、主
信号光の光周波数を周波数変調信号の周波数分だけシフ
トする。これにより、主信号光の波長は元の波長から変
調周波数分だけずれることになり、図２(a) に示すよう
に10Ｇbps でディジタル強度変調された２つの主信号光
Ａ，Ｂの波長差が、図２(b) に示すように約10ＭHzを中
心にして周波数変調されることになる。すなわち、２つ
の主信号光の波長差がラベルとなるので、主信号光とラ
ベルの変調周波数を独立に選ぶことができる。Here, control information (label) of the main signal light
Is applied to the acousto-optic element 14 as a frequency modulation signal centered at, for example, 10 MHz. The acousto-optic device 14 shifts the optical frequency of the main signal light by the frequency of the frequency modulation signal. As a result, the wavelength of the main signal light is shifted from the original wavelength by the modulation frequency, and the wavelength difference between the two main signal lights A and B digitally modulated at 10 Gbps as shown in FIG. As shown in FIG. 2B, the frequency is modulated at about 10 MHz. That is, since the wavelength difference between the two main signal lights becomes a label, the modulation frequencies of the main signal light and the label can be independently selected.
【００１６】この主信号光Ａと、ラベルにより周波数変
調された主信号光Ｂの波長差はわずかであるので、光合
波器１５で合波して出力することにより、光伝送ネット
ワーク内に配置された光多重装置、光分離装置、光フィ
ルタなどの光装置では同一波長の光として処理される。Since the wavelength difference between the main signal light A and the main signal light B frequency-modulated by the label is small, the main signal light A is multiplexed by the optical multiplexer 15 and output, so that it is arranged in the optical transmission network. In optical devices such as an optical multiplexing device, an optical demultiplexing device, and an optical filter, the light is processed as light having the same wavelength.
【００１７】図３は、本発明の光ラベル多重伝送装置に
おける中継装置の構成例を示す。図において、主信号光
Ａ，Ｂは一つの波長の光として中継装置に到達し、光分
岐器２１で２分岐され、その一方の主信号光Ａ1,Ｂ1 が
波長差検出器２２に入力され、その波長差に対応した変
調周波数が検波される。波長差検出器２２の出力信号は
10ＭHzを中心とした周波数変調信号であり、復調器２３
で復調されて制御情報（ラベル）が読み出され、経路制
御器２４に入力される。経路制御器２４では、復調され
た制御情報をもとに経路を決定し、光経路切替器２５を
制御して光経路を切り替える。光分配器２１で分岐され
た他方の主信号光Ａ2,Ｂ2 は、遅延光回路２６で以上の
処理遅延が吸収され、光経路切替器２５で切り替えられ
た光経路に送信される。FIG. 3 shows an example of the configuration of a repeater in the optical label multiplex transmission apparatus of the present invention. In the figure, main signal lights A and B reach the repeater as light of one wavelength, are split into two by an optical splitter 21, and one of the main signal lights A1 and B1 is input to a wavelength difference detector 22, A modulation frequency corresponding to the wavelength difference is detected. The output signal of the wavelength difference detector 22 is
This is a frequency modulated signal centered on 10 MHz,
Is demodulated to read out control information (label) and input to the path controller 24. The path controller 24 determines a path based on the demodulated control information and controls the optical path switch 25 to switch the optical path. The other main signal light beams A2 and B2 split by the optical distributor 21 are transmitted to the optical path switched by the optical path switch 25 after the above processing delay is absorbed by the delay optical circuit 26.
【００１８】ここで、波長差検出器２２としては、例え
ば数十ＭHzまでの応答速度を有するフォトダイオードを
用いることができる。フォトダイオードには二乗検波特
性があり、主信号光Ａ1,Ｂ1 を直接入力することによ
り、ビート信号としてその波長差に応じた周波数の電気
信号（周波数変調信号）が検波される。この動作速度は
10ＭHz程度であるので、復調器２３、経路制御器２４、
光経路切替器２５までの電気処理装置は、比較的容易に
構成することができる。Here, as the wavelength difference detector 22, for example, a photodiode having a response speed up to several tens of MHz can be used. The photodiode has a square detection characteristic. By directly inputting the main signal lights A1 and B1, an electric signal (frequency modulation signal) having a frequency corresponding to the wavelength difference is detected as a beat signal. This operating speed is
Since it is about 10 MHz, the demodulator 23, the path controller 24,
The electrical processing device up to the optical path switch 25 can be configured relatively easily.
【００１９】一方、中継される主信号光Ａ2,Ｂ2 は、電
気信号に変換されることなく光のままで経路が切り替え
られるので、そのデータレートが10Ｇbps あるいはそれ
以上であっても、中継装置の処理能力に何ら影響を与え
ない。On the other hand, the route of the main signal light A2, B2 to be relayed is switched as it is without being converted into an electric signal, so that even if the data rate is 10 Gbps or higher, the relay device does not operate. Has no effect on processing capacity.
【００２０】なお、図１では、１つの光源から出力され
た光を２分岐し、その一方の光を制御情報（ラベル）に
より周波数変調する構成を示したが、光源の出力光を３
以上に分岐し、１つの主信号光に対する波長差がそれぞ
れ独立に変調される構成をとることにより、複数の制御
情報あるいはデータを同時に伝送することが可能であ
る。FIG. 1 shows a configuration in which the light output from one light source is branched into two and one light is frequency-modulated by control information (label).
By branching as described above and adopting a configuration in which the wavelength difference with respect to one main signal light is independently modulated, a plurality of control information or data can be transmitted at the same time.
【００２１】また、図１の構成において、光強度変調器
１２を用いた外部変調方式に代えて、半導体レーザ等の
光源１１をディジタル信号で変調する直接変調方式とし
てもよい。In the configuration of FIG. 1, instead of the external modulation method using the light intensity modulator 12, a direct modulation method for modulating the light source 11 such as a semiconductor laser with a digital signal may be used.
【００２２】また、光強度変調器１２は、光合波器１５
の後段に配置してもよい。あるいは、光分岐器１３で２
分岐された一方に光強度変調器１２を配置し、他方に音
響光学素子１４を配置してもよい。これらの場合には、
音響光学素子１４は無変調光を周波数変調することにな
る。The light intensity modulator 12 includes an optical multiplexer 15
May be arranged at the subsequent stage. Alternatively, the optical splitter 13
The light intensity modulator 12 may be arranged on one of the branches, and the acousto-optical element 14 may be arranged on the other. In these cases,
The acousto-optic device 14 modulates the frequency of the unmodulated light.
【００２３】また、主信号光はディジタル信号による強
度変調に限らず、アナログ信号により強度変調されてい
ても同様である。さらに、制御情報（ラベル）は周波数
変調に限らず、位相変調等の別の変調方式を用いても同
様の効果が期待できる。The main signal light is not limited to the intensity modulation by the digital signal, but the same applies even if the intensity is modulated by the analog signal. Further, the control information (label) is not limited to frequency modulation, and similar effects can be expected even if another modulation method such as phase modulation is used.
【００２４】[0024]
【発明の効果】以上説明したように、本発明の光ラベル
多重伝送装置は、分岐された一方の光信号を制御情報
（ラベル）をのせた低速信号で変調することにより、分
岐された２つの光信号の波長差が低速信号により変調さ
れることになり、その波長差をラベルとして用いること
ができる。また、分岐された２つの光信号を用いている
ために、分岐前の光の波長に変動があっても相対値であ
る波長差は安定である。なお、これは３分岐以上する場
合も同様である。As described above, the optical label multiplexing transmission apparatus of the present invention modulates one of the branched optical signals with the low-speed signal carrying control information (label), thereby forming the two branched optical signals. The wavelength difference of the optical signal is modulated by the low-speed signal, and the wavelength difference can be used as a label. Further, since two branched optical signals are used, the wavelength difference, which is a relative value, is stable even if the wavelength of light before branching varies. The same applies to the case where three or more branches are taken.
【００２５】これにより、ラベルの変調周波数を主信号
光のデータレートよりも低くすることができるので、中
継装置で主信号光のデータレートに関わらず、低速の電
気回路でラベルを抽出することができる。Thus, the modulation frequency of the label can be made lower than the data rate of the main signal light, so that the repeater can extract the label with a low-speed electric circuit regardless of the data rate of the main signal light. it can.
【図１】本発明の光ラベル多重伝送装置における光変調
器の構成例を示すブロック図。FIG. 1 is a block diagram showing a configuration example of an optical modulator in an optical label multiplex transmission device of the present invention.
【図２】ディジタル強度変調された主信号光Ａ，Ｂと、
周波数変調された波長差Δλの様子を説明する図。FIG. 2 shows main signal lights A and B modulated by digital intensity modulation;
FIG. 6 is a diagram for explaining a state of a wavelength difference Δλ subjected to frequency modulation.
【図３】本発明の光ラベル多重伝送装置における中継装
置の構成例を示すブロック図。FIG. 3 is a block diagram showing a configuration example of a relay device in the optical label multiplex transmission device of the present invention.
【図４】従来の中継装置の構成例を示すブロック図。FIG. 4 is a block diagram showing a configuration example of a conventional relay device.
【図５】光ラベルスイッチング方式を説明する図。FIG. 5 is a diagram illustrating an optical label switching method.
【図６】光ラベルスイッチング方式で用いる中継装置の
構成例を示すブロック図。FIG. 6 is a block diagram showing a configuration example of a relay device used in the optical label switching method.
１１ 光源 １２ 光強度変調器 １３ 光分岐器 １４ 音響光学素子（ＡＯＭ） １５ 光合波器 ２１ 光分岐器 ２２ 波長差検出器 ２３ 復調器 ２４ 経路制御器 ２５ 光経路切替器 ２６ 遅延光回路 DESCRIPTION OF SYMBOLS 11 Light source 12 Optical intensity modulator 13 Optical splitter 14 Acoustic optical element (AOM) 15 Optical multiplexer 21 Optical splitter 22 Wavelength difference detector 23 Demodulator 24 Path controller 25 Optical path switch 26 Delay optical circuit
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｇ０２Ｆ 2/02 Ｈ０４Ｂ 10/02 Ｈ０４Ｌ 12/56 (72)発明者 岡田 顕 東京都千代田区大手町二丁目３番１号 日 本電信電話株式会社内 (72)発明者 坂本 尊 東京都千代田区大手町二丁目３番１号 日 本電信電話株式会社内 (72)発明者 松岡 茂登 東京都千代田区大手町二丁目３番１号 日 本電信電話株式会社内 Ｆターム(参考） 2H079 AA04 BA05 CA04 FA04 HA11 KA20 2K002 AA02 AB12 BA12 HA10 5K002 AA02 AA06 BA02 BA04 BA05 CA14 CA15 DA05 DA21 FA01 GA04 5K030 HA08 HB11 JA01 JL03 LA17 LB05 ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme coat ゛ (Reference) G02F 2/02 H04B 10/02 H04L 12/56 (72) Inventor Akira Okada 2-chome Otemachi, Chiyoda-ku, Tokyo No.3-1 Inside Nippon Telegraph and Telephone Corporation (72) Inventor Takashi Sakamoto 2-3-1 Otemachi, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone Corporation (72) Inventor Shigeto Matsuoka Otemachi, Chiyoda-ku, Tokyo 2-3-1, Nippon Telegraph and Telephone Corporation F-term (reference) 2H079 AA04 BA05 CA04 FA04 HA11 KA20 2K002 AA02 AB12 BA12 HA10 5K002 AA02 AA06 BA02 BA04 BA05 CA14 CA15 DA05 DA21 FA01 GA04 5K030 HA08 HB11 JA01 JL03 LA17 LB05
Claims (7)
手段と、 前記光分岐手段で分岐された一方の光信号の波長を制御
情報（ラベル）をのせた低速信号で変調する光変調手段
と、 前記光分岐手段で分岐された他方の光信号と前記光変調
手段から出力された光信号とを合波する光合波器とを備
え、 前記所定の波長の光信号から分岐された各光信号の波長
差が前記低速信号により変調されていることを特徴とす
る光ラベル多重伝送装置。1. An optical splitter for splitting an optical signal having a predetermined wavelength into two, and an optical modulator for modulating a wavelength of one of the optical signals split by the optical splitter with a low-speed signal carrying control information (label). Means, and an optical multiplexer for multiplexing the other optical signal branched by the optical branching means and the optical signal output from the optical modulation means, each of which is branched from the optical signal of the predetermined wavelength. An optical label multiplex transmission apparatus, wherein a wavelength difference of an optical signal is modulated by the low-speed signal.
上の整数）する光分岐手段と、 前記光分岐手段で分岐されたｎ−１個の光信号の波長を
それぞれ異なる制御情報（ラベル）をのせた低速信号で
変調するｎ−１個の光変調手段と、 前記光分岐手段で分岐された１つの光信号と前記各光変
調手段から出力された光信号とを合波する光合波器とを
備え、 前記所定の波長の光信号から分岐された各光信号の波長
差が前記ｎ−１個の低速信号によりそれぞれ変調されて
いることを特徴とする光ラベル多重伝送装置。2. An optical branching unit for n-branching an optical signal of a predetermined wavelength (n is an integer of 3 or more), and control information different in wavelengths of n-1 optical signals branched by said optical branching unit. (N-1) optical modulating means for modulating with a (labeled) low-speed signal; one optical signal split by the optical splitting means and an optical signal output from each optical modulating means. An optical label multiplex transmission apparatus, comprising: an optical multiplexer, wherein a wavelength difference of each optical signal branched from the optical signal having the predetermined wavelength is modulated by the n-1 low-speed signals.
より強度変調されて前記光分岐手段に入力される構成で
あることを特徴とする請求項１または請求項２に記載の
光ラベル多重伝送装置。3. The optical label multiplex transmission according to claim 1, wherein the optical signal of the predetermined wavelength is intensity-modulated by transmission data and input to the optical branching unit. apparatus.
送データにより強度変調されて出力される構成であるこ
とを特徴とする請求項１または請求項２に記載の光ラベ
ル多重伝送装置。4. The optical label multiplex transmission apparatus according to claim 1, wherein the optical signal output from the optical multiplexer is modulated in intensity by transmission data and output.
が伝送データにより強度変調されて光合波器に入力され
る構成であることを特徴とする請求項１または請求項２
に記載の光ラベル多重伝送装置。5. An optical multiplexer according to claim 1, wherein one optical signal split by said optical splitter is intensity-modulated by transmission data and input to an optical multiplexer.
3. The optical label multiplex transmission device according to claim 1.
（ラベル）をのせた低速信号で周波数変調する音響光学
素子であることを特徴とする請求項１または請求項２に
記載の光ラベル多重伝送装置。6. The light according to claim 1, wherein the light modulating means is an acousto-optic element that frequency-modulates the wavelength of the optical signal with a low-speed signal carrying control information (label). Label multiplex transmission equipment.
光信号を入力し、二乗検波して前記低速信号を出力する
検波手段を備えたことを特徴とする光ラベル多重伝送装
置。7. An optical label multiplex transmission apparatus, comprising: a detection unit that receives an optical signal having a wavelength difference modulated by the low-speed signal, performs square detection, and outputs the low-speed signal.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20449699A JP3590741B2 (en) | 1999-07-19 | 1999-07-19 | Optical label multiplex transmission equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20449699A JP3590741B2 (en) | 1999-07-19 | 1999-07-19 | Optical label multiplex transmission equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001036477A true JP2001036477A (en) | 2001-02-09 |
| JP3590741B2 JP3590741B2 (en) | 2004-11-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20449699A Expired - Fee Related JP3590741B2 (en) | 1999-07-19 | 1999-07-19 | Optical label multiplex transmission equipment |
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