JPH067700B2 - Light time switch - Google Patents
Light time switchInfo
- Publication number
- JPH067700B2 JPH067700B2 JP17680684A JP17680684A JPH067700B2 JP H067700 B2 JPH067700 B2 JP H067700B2 JP 17680684 A JP17680684 A JP 17680684A JP 17680684 A JP17680684 A JP 17680684A JP H067700 B2 JPH067700 B2 JP H067700B2
- Authority
- JP
- Japan
- Prior art keywords
- optical
- circuit
- output
- optical signal
- output terminal
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired - Lifetime
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Use Of Switch Circuits For Exchanges And Methods Of Control Of Multiplex Exchanges (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は、時分割多重された光に信号の光のまま交換す
る光時分割交換機の時間スイッチに関するものである。Description: TECHNICAL FIELD The present invention relates to a time switch of an optical time division switch for exchanging signal light as it is with time-division multiplexed light.
（従来の技術） 従来のこの種の装置は、１タイムスロットの整数倍（ｉ
倍、ｉ＝０〜Ｎ-1，（Ｎ：多重度）)の時間だけ入力光
信号を遅延させる光遅延素子を多重度Ｎの数だけ並列に
並べ、入力ハイウェイの各タイムスロットの光信号を遅
延させたい遅延時間に応じて適当な光遅延素子へ振り分
け、各遅延素子の出力を結合器を通して出力ハイウェイ
上へ出力するという方法をとり、タイムスロット毎に適
当な遅延を与えることにより、出力ハイウェイでの信号
の時間位置を変えるという時間スイッチの機能を実現し
ていた。第３図は従来の光時間スイッチの構成例であ
る。１は入力ハイウェイ、２は出力ハイウェイであり、
入力ハイウェイ１から入力した光信号はスイッチＳAに
より、遅延素子Ｄ0〜ＤN-1の中の適当な遅延素子に導び
かれる。（遅延素子内のかっこ内は、各遅延素子の遅延
時間であり、τは１タイムスロットの時間を表わす。）
光信号は各遅延素子内で遅延した後、結合器ＳBにより
出力ハイウェイ上へ出てゆく。(Prior Art) A conventional device of this type is an integer multiple of one time slot (i
Times, i = 0 to N−1, (N: multiplicity)), optical delay elements that delay the input optical signal for a time of N are arranged in parallel, and the optical signal of each time slot of the input highway is arranged. According to the delay time you want to delay, it is distributed to an appropriate optical delay element and the output of each delay element is output to the output highway through a coupler. By giving an appropriate delay for each time slot, the output highway It realized the function of the time switch to change the time position of the signal at. FIG. 3 is a configuration example of a conventional optical time switch. 1 is an input highway, 2 is an output highway,
The optical signal input from the input highway 1 is guided by the switch S A to an appropriate delay element among the delay elements D 0 to D N-1 . (The parentheses in the delay elements are the delay times of the delay elements, and τ represents the time of one time slot.)
The optical signal is delayed in each delay element and then exits on the output highway by the coupler S B.
（発明が解決しようとする問題点） 従来の光時間スイッチはこの様な構成であったため、多
重度Ｎが増すと遅延素子の種類（Ｎ種類）が増し、遅延
素子のハードウェア量が増大するという欠点があった。(Problems to be Solved by the Invention) Since the conventional optical time switch has such a configuration, the type of delay element (N types) increases as the multiplicity N increases, and the amount of hardware of the delay element increases. There was a drawback.
（問題点を解決するための手段） 本発明は、この欠点を解決するため１タイムスロット分
の遅延を持つ遅延素子を直列に接続し、光信号を必要な
遅延時間分だけの段数通過させて取り出すようにしたも
のである。(Means for Solving the Problems) In order to solve this drawback, the present invention connects delay elements having a delay of one time slot in series, and passes an optical signal through the number of stages corresponding to the required delay time. I took it out.
（作 用） 上記構成により遅延素子は１種類でよく、多重度にかか
わらず簡単な構成の光時間スイッチが得られる。(Operation) With the above configuration, only one type of delay element is required, and an optical time switch with a simple configuration can be obtained regardless of the multiplicity.
（実施例） 第１図は、本発明の実施例であって、１は入力ハイウェ
イ、２は出力ハイウェイ、３は入力回路、４は出力回
路、S1，S2，…ＳＮは光信号取出し回路、10，20，…Ｎ
０は各々の光信号取出し回路の入力端子、11，21，…Ｎ
１は各々の光信号取出し回路の特定タイムスロットを取
出すための出力端子、12，22，…Ｎ２は各々の光信号取
出し回路の出力端子、D1は光遅延素子、Ａは光遮蔽板、
Ｃは光結合器である。(Embodiment) FIG. 1 shows an embodiment of the present invention, in which 1 is an input highway, 2 is an output highway, 3 is an input circuit, 4 is an output circuit, and S1, S2, ... SN are optical signal extraction circuits. , 10, 20, ... N
0 is an input terminal of each optical signal extraction circuit, 11, 21, ... N
1 is an output terminal for extracting a specific time slot of each optical signal extraction circuit, 12, 22, ... N 2 is an output terminal of each optical signal extraction circuit, D1 is an optical delay element, A is an optical shield plate,
C is an optical coupler.
光信号取出し回路に光スイッチを用いる場合の動作を以
下で説明する。タイムスロット時間間隔τで時分割多重
された入力ハイウェイ上の光信号は３の入力回路を何の
変更も加えられずに通過した後、各光信号取出し回路Sj
（ｊ＝１〜Ｎ）へ順に入力される。各光信号取出し回路
Sjにはj-1個の光遅延素子Ｄ1で（j-1）τだけの遅延を
受けた光信号が入力されるので、入力光信号中（j-1）
×τだけ遅延させたいタイムスロットの光信号を、光取
出し回路Sj中の１×２光スイッチにより出力端子ｊ１へ
出力する。これにより、出力端子ｊ1から（j-1）×τだ
け遅延した光信号を得ることができる。光結合器Ｃは、
必要な時間だけ遅延した各タイムスロットの光信号を結
合して、出力回路４へ出力する。出力回路４は、入力し
た光信号をそのまま何の変更も加えずに出力ハイウェイ
へ出力する。光遮蔽板は最後の光信号取出し回路ＳＮの
出力端子Ｎ２からの不要となった光出力を吸収するため
にある。光遅延素子は遅延時間τに対応した長さの光フ
ァイバにより実現でき、入力回路、出力回路は、入力、
出力ハイウェイと同等の特性を持つ光ファイバにより実
現でき、光信号取出し回路Ｓｊは高速動作の光スイッチ
素子（例えばLiNbO3による方向性結合形スイッチ）によ
り出現でき、本通話路の制御は従来の電気用時間スイッ
チの制御回路に、光スイッチを駆動するためのドライバ
を付加することにより実現できる。The operation when an optical switch is used in the optical signal extraction circuit will be described below. The optical signal on the input highway that is time-division multiplexed at the time slot time interval τ passes through the input circuit 3 without any change, and then each optical signal extraction circuit Sj
(J = 1 to N) are sequentially input. Optical signal extraction circuit
Since the optical signal delayed by (j-1) τ by j-1 optical delay elements D 1 is input to Sj, the input optical signal (j-1)
The optical signal of the time slot to be delayed by xτ is output to the output terminal j 1 by the 1 × 2 optical switch in the optical extraction circuit Sj. This makes it possible to obtain an optical signal delayed by (j-1) × τ from the output terminal j1. The optical coupler C is
The optical signals of the respective time slots delayed by the required time are combined and output to the output circuit 4. The output circuit 4 outputs the input optical signal as it is to the output highway without any change. The light shield plate is for absorbing the unnecessary light output from the output terminal N 2 of the last optical signal extraction circuit SN . The optical delay element can be realized by an optical fiber with a length corresponding to the delay time τ.
It can be realized by an optical fiber having the same characteristics as the output highway, and the optical signal extraction circuit S j can be realized by a high-speed operation optical switching element (for example, a directional coupling type switch using LiNbO 3 ), and the control of this communication path can be performed by the conventional method. This can be realized by adding a driver for driving the optical switch to the control circuit of the electric time switch.
光信号取出し回路に光フィルタを用いる場合の動作を以
下で説明する。この場合各光信号取出し回路Sjは入力信
号の中の特定の波長λjのみを出力端子j1へ出力し、残
りの光を出力端子j2へ出力するような光フィルタで構成
され、入力回路は入力ハイウェイ上の光信号をλ1〜λN
の波長に変換する波長変換回路、出力回路は光結合器の
出力光信号の波長を出力ハイウェイ上の波長に変換する
波長変換回路で構成される。タイムスロット時間間隔τ
で時分割多重された入力ハイウェイ上の光信号は３の入
力回路で、タイムスロット毎に取り出したい光信号取出
し回路の取り出し波長に対応する波長にそれぞれ変換さ
れる。λjの波長に変換された光信号は光信号取出し回
路と光遅延素子からなる（ｊ−１）組の単位遅延光回路
を通過することにより（ｊ−１）回だけ遅延された後、
Sjにより出力端子j1から取り出され光結合器Ｃを通り出
力回路４に入力される。The operation when an optical filter is used in the optical signal extraction circuit will be described below. In this case, each optical signal extraction circuit Sj is configured with an optical filter that outputs only the specific wavelength λj in the input signal to the output terminal j1 and outputs the remaining light to the output terminal j2. The optical signal above is λ 1 ~ λ N
The wavelength conversion circuit that converts the wavelength of the optical signal output from the optical coupler to the wavelength on the output highway is configured as the wavelength conversion circuit that converts the wavelength of the optical coupler to the wavelength of the optical coupler. Time slot time interval τ
The time-division-multiplexed optical signal on the input highway is converted into wavelengths corresponding to the extraction wavelengths of the optical signal extraction circuit desired to be extracted at each time slot by the input circuit of 3. The optical signal converted to the wavelength of λj is delayed by (j-1) times by passing through (j-1) sets of unit delay optical circuits each including an optical signal extraction circuit and an optical delay element,
It is taken out from the output terminal j1 by Sj and is inputted to the output circuit 4 through the optical coupler C.
出力回路４にはλ1〜λNの波長の光信号が入力されるの
でこれを単一の出力ハイウェイ上の波長に変換する。Since the optical signals of wavelengths λ 1 to λ N are input to the output circuit 4, they are converted into wavelengths on a single output highway.
波長変換回路は入力回路側、出力回路側ともにフォトダ
イオードとλ1〜λN，λ0の発振波長を持つレーザダイ
オード等で実現できる。The wavelength conversion circuit can be realized by a photodiode and a laser diode having an oscillation wavelength of λ 1 to λ N and λ 0 on both the input circuit side and the output circuit side.
光フィルタの実現例を第２図に示す。j0はSjの入力端
子、λj〜λNはSjへの入力波長、B1jは分波器、B2jは合
波器、j1は光信号取出回路Sjのλj取出し用端子（出力
端子１）、j2は次段の光遅延素子への出力端子（出力端
子２）である。j0から入った光はB1jでλj〜λNの各波
長に分波され、その中のλjだけは端子j1へ取出され、
残りの光信号は合波器B2jにより合成されj2から出てゆ
く。本通話路の制御は従来の電気式時間スイッチの制御
回路と同様の回路により入力回路の波長変換回路の変換
波長を制御することで実現できる。An implementation example of the optical filter is shown in FIG. j0 is an input terminal of Sj, λj to λ N are input wavelengths to Sj, B1j is a demultiplexer, B2j is a multiplexer, j1 is a λj extraction terminal (output terminal 1) of the optical signal extraction circuit Sj, and j2 is It is an output terminal (output terminal 2) to the optical delay element in the next stage. light entering from j0 is branched into each wavelength Ramudajei～ramuda N in B1j, only λj therein is withdrawn to the terminal j1,
The remaining optical signals are combined by the multiplexer B2j and exit from j2. The control of this communication path can be realized by controlling the conversion wavelength of the wavelength conversion circuit of the input circuit by a circuit similar to the control circuit of the conventional electric time switch.
（発明の効果） 以上説明したように、本発明の時間スイッチによれば、
１タイムスロット分の遅延素子を直列に接続する構成と
なるので、必要な遅延素子が１タイムスロット分１種類
だけでよく、その数も（多重度−１）だけでよいという
利点がある。また、波長変換回路と光フィルタを用いる
構成では、光信号取出し回路に光スイッチが不要となる
ので、高速の時間スイッチを実現できる可能性がある。
また、光遅延素子としては光ファイバを用いる構成で
は、ひとつの遅延素子で数ビット同時に遅延でき、しか
も光ファイバの持つ広帯域性のため光信号の波形がくず
れないという利点がある。なお、光ファイバの遅延時間
特性には一般には波長依存性があるが、本発明を実現す
る際には波長依存性が無視できる程度の実現条件を選択
することができる。(Effect of the Invention) As described above, according to the time switch of the present invention,
Since the delay elements for one time slot are connected in series, there is an advantage that only one type of delay element is required for one time slot and the number of delay elements is only (multiplicity -1). Further, in the configuration using the wavelength conversion circuit and the optical filter, an optical switch is not required in the optical signal extraction circuit, so that there is a possibility that a high-speed time switch can be realized.
Further, in the configuration using the optical fiber as the optical delay element, there is an advantage that one delay element can delay several bits at the same time and the waveform of the optical signal is not distorted due to the wide band property of the optical fiber. Although the delay time characteristic of an optical fiber generally has wavelength dependency, when implementing the present invention, it is possible to select an implementation condition in which the wavelength dependency can be ignored.
第１図は、本発明の実施例の構成図、第２図は光信号取
出し回路を分岐・合波器で構成した構成図、第３図は従
来の光時間スイッチの構成図である。 １…入力ハイウェイ、２…出力ハイウェイ、 ＳA…遅延素子選択用光スイッチ、 ＳB…出力用光結合器、 Ｄ0，Ｄ1，Ｄ2，Ｄk，ＤN-1…光遅延素子、 Ｎ…時分割多重度、 ｔ0，ｔ1，ｔ2，ｔk，ｔN-1…遅延時間、 τ…１タイムスロットの時間、 10，20，……Ｎ０…光信号取出し回路の入力端子 11，21，……Ｎ１，…光信号取出し回路の出力端子１， 12，22，……Ｎ２，…光信号取出し回路の出力端子２， ３…入力回路、４…出力回路、 Ｓ1，Ｓ2…Sj…ＳN…光信号取出し回路、 Ｃ…出力用光結合器、Ａ…光遮蔽板、 λj，λj+1，…λN…波長、B1j…光分波器、 B2j…光合波器。FIG. 1 is a configuration diagram of an embodiment of the present invention, FIG. 2 is a configuration diagram in which an optical signal extraction circuit is configured by a branching / multiplexing device, and FIG. 3 is a configuration diagram of a conventional optical time switch. 1 ... Input highway, 2 ... Output highway, S A ... Delay element selection optical switch, S B ... Output optical coupler, D 0 , D 1 , D 2 , D k , D N-1 ... Optical delay element, N ... Time division multiplicity, t 0 , t 1 , t 2 , t k , t N-1 ... Delay time, τ ... 1 time slot time, 10, 20, ... N 0 ... Input of optical signal extraction circuit Terminals 11, 21, ... N 1 , ... Output terminals of optical signal extraction circuit 1, 12, 22, ... N 2 , ... Output terminals of optical signal extraction circuit 2, 3 ... Input circuit, 4 ... Output circuit, S 1 , S 2 ... Sj ... SN ... Optical signal extraction circuit, C ... Output optical coupler, A ... Optical shield plate, λj, λj + 1, ... λN ... Wavelength, B1j ... Optical demultiplexer, B2j ... Optical combination Wave instrument.
Claims (1)
重光信号を伝送する入力及び出力ハイウェイがあり、 特定波長のみを取り出す第１の出力端子とそれ以外の波
長を出力する第２の出力端子を有する光信号取出し回路
と、該光信号取出し回路の前記第２の出力端子と接続し
遅延時間τを有する光遅延阻止とからなる一組の単位遅
延光回路を（Ｎ−１）組設け、また隣接する２組の単位
遅延光回路の前段の単位遅延光回路の光遅延素子側の出
力端子を次段の単位遅延光回路の入力端子に接続するこ
とにより、（Ｎ−１）組の単位遅延光回路を前記特定波
長が各々異なるように直列に接続し、 更に入力端子に前記入力ハイウェイを接続し、かつ出力
端子が直列接続した１組目の前記単位遅延光回路の入力
端子に接続され、前記入力ハイウェイのタイムスロット
の時間幅τの整数倍である遅延時間に対応した異なるＮ
個の特定の波長に変換する入力回路と、 （Ｎ−１）組目の前記単位遅延光回路の出力端子に接続
し、前記特定波長のみを取り出す第１の出力端子とそれ
以外の波長を出力する第２の出力端子を有する光信号取
出し回路と、 各組の前記単位遅延光回路内の前記各光信号取出し回路
及び（Ｎ−１）組目の前記単位遅延光回路の出力端子に
接続した前記光信号取出し回路の前記各第１の出力端子
からの前記特定波長を合波する光結合器と、 該光結合器からの光信号の波長を前記出力ハイウェイの
波長に変換する出力回路とを設けた、 ことを特徴とする光時間スイッチ。1. An input and output highway for transmitting an N-multiplexed (N is a natural number of 2 or more) time-division multiplexed optical signal, a first output terminal for extracting only a specific wavelength and a first output terminal for outputting other wavelengths. A set of unit delay optical circuits consisting of an optical signal take-out circuit having two output terminals and an optical delay block having a delay time τ connected to the second output terminal of the optical signal take-out circuit (N-1 ), By connecting the output terminal on the optical delay element side of the unit delay optical circuit in the preceding stage of two adjacent unit delay optical circuits to the input terminal of the unit delay optical circuit in the next stage, (N-1 ) A set of unit delay optical circuits are connected in series so that the specific wavelengths are different from each other, the input highway is further connected to an input terminal, and an output terminal of the unit delay optical circuit is connected in series. Connected to the terminal, the input highway Different N corresponding to the delay time that is an integer multiple of the time width τ of the time slot of
An input circuit for converting into a specific wavelength and an output terminal of the (N-1) th unit delay optical circuit, and outputs a first output terminal for extracting only the specific wavelength and other wavelengths. And an optical signal extraction circuit having a second output terminal, each optical signal extraction circuit in each unit delay optical circuit of each set, and an output terminal of the (N-1) th unit delay optical circuit. An optical coupler that combines the specific wavelengths from the first output terminals of the optical signal extraction circuit, and an output circuit that converts the wavelength of the optical signal from the optical coupler to the wavelength of the output highway. An optical time switch, characterized by being provided.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17680684A JPH067700B2 (en) | 1984-08-27 | 1984-08-27 | Light time switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17680684A JPH067700B2 (en) | 1984-08-27 | 1984-08-27 | Light time switch |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6154789A JPS6154789A (en) | 1986-03-19 |
| JPH067700B2 true JPH067700B2 (en) | 1994-01-26 |
Family
ID=16020161
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17680684A Expired - Lifetime JPH067700B2 (en) | 1984-08-27 | 1984-08-27 | Light time switch |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH067700B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01191126A (en) * | 1988-01-27 | 1989-08-01 | Nec Corp | Optical time switch |
| JPH03144425A (en) * | 1989-10-31 | 1991-06-19 | Fujitsu Ltd | Level stabilizing method for light pulse string and demultiplexing and insertion processing node and time switch used in the same method |
-
1984
- 1984-08-27 JP JP17680684A patent/JPH067700B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6154789A (en) | 1986-03-19 |
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