JPS6390229A - Optical transmission system - Google Patents
Optical transmission systemInfo
- Publication number
- JPS6390229A JPS6390229A JP61235662A JP23566286A JPS6390229A JP S6390229 A JPS6390229 A JP S6390229A JP 61235662 A JP61235662 A JP 61235662A JP 23566286 A JP23566286 A JP 23566286A JP S6390229 A JPS6390229 A JP S6390229A
- Authority
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- Japan
- Prior art keywords
- optical
- wavelength
- terminal equipments
- terminal device
- terminal devices
- 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.)
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- 230000003287 optical effect Effects 0.000 title claims abstract description 111
- 230000005540 biological transmission Effects 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 claims description 5
- 238000012545 processing Methods 0.000 abstract description 5
- 239000013307 optical fiber Substances 0.000 description 5
- 238000004891 communication Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Abstract
Description
【発明の詳細な説明】
［発明の目的］
（産業上の利用分野）
本発明は、例えば光ＬＡＮに使用される光伝送方式に関
する。DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to an optical transmission system used, for example, in an optical LAN.
（従来の技術）
近年、光ローカルエリアネットワーク
（光ＬＡＮ）は、光ファイバが有する広帯域性および耐
電磁妨害性の特徴を生かし、各方面で実用化が進められ
ている。中でも光スターカプラをセンタノードとして使
用した光ＬＡＮは、各端末装置が分散形であり、また伝
送制御手順も簡単であることから小〜中規模のＬＡＮと
して注［１を集めている。第３図はこの種のシステムの
一例を示すもので、光スターカプラ１にそれぞれ光ファ
イバからなる光伝送路２を介して複数の端末装置（図で
は４台）１０，２０，３０．４０をそれぞれ接続し、こ
れらの端末装置１０，２０，３０．４０相互間で光デー
タの伝送を行なっている。(Prior Art) In recent years, optical local area networks (optical LANs) have been put into practical use in various fields, taking advantage of the broadband and electromagnetic interference resistance characteristics of optical fibers. Among them, optical LANs using optical star couplers as center nodes are attracting attention as small to medium-sized LANs because each terminal device is distributed and the transmission control procedure is simple. FIG. 3 shows an example of this type of system, in which a plurality of terminal devices (four in the figure) 10, 20, 30, 40 are connected to an optical star coupler 1 via optical transmission lines 2 each consisting of an optical fiber. These terminal devices 10, 20, 30, and 40 are connected to each other, and optical data is transmitted between them.
ところで、光ファイバは前述のように広帯域性を有して
おり、波長多重された信号を伝送することができるので
、端末装置１０．２０，３０゜４０各々に２波以上の波
長を割当て、これらの端末装置１０，２０． ３０．４
０にてこれら複数波長を送受信するようにすることが可
能となる。この場合、波長多重および波長分岐するため
の装置が端末装置１０．２０，３０．４０内に必要とな
り、このような装置の一つとし光合分波器と言うものが
開発されている。しかしながら、この光合分波器は、構
成か複雑で大形かつ高価なものであるため、端末装置１
０，２０，３０．４０の構成が複雑で大形かつ高価にな
るという不具合が生じる。By the way, as mentioned above, optical fibers have broadband properties and can transmit wavelength-multiplexed signals. terminal devices 10, 20. 30.4
It becomes possible to transmit and receive these multiple wavelengths at 0. In this case, a device for wavelength multiplexing and wavelength branching is required in the terminal devices 10.20, 30.40, and an optical multiplexer/demultiplexer has been developed as one such device. However, this optical multiplexer/demultiplexer has a complicated configuration, is large in size, and is expensive.
0, 20, 30, and 40 is complicated, large in size, and expensive.
（発明が解決しようとする問題点）
以上のように従来の方式は、各端末装置に光合分波器を
必要とするため、装置の構成がＩＭ雑で大形化しかつ高
価になるという問題点を有するもので、本発明はこの点
に着１」シ、簡Ｉ）ｔで小形かつ安価な構成で端末装置
間の光データ伝送を行ないｉ＋４る光伝送ｈ゛式を提供
しようとするものである。(Problems to be Solved by the Invention) As described above, the conventional system requires an optical multiplexer/demultiplexer for each terminal device, so the device has a complicated IM configuration, is large in size, and is expensive. In view of this, the present invention aims to provide an optical transmission method for transmitting optical data between terminal devices with a simple, compact and inexpensive configuration. be.
［発明の（１１４成］
（問題点を解決するための手段）
本発明は、光スターカプラに接続される段数の端末装置
のうち特定の端末装置に他の端末装；１９が使用しない
特定波長の光信号を送信する光送信器を設けるとともに
、」１記６端末装置が接続される光スターカプラの出力
ポートから各端末装置の受光素子までの光伝送路中にそ
れぞれ自己の端末装置が使用する波長の光信号のみを通
過させる光波長フィルタを介挿し、これにより上記特定
端末装置間で他の端末装置に対し独立して光伝送を行な
うようにしたものである。[Composition 114 of the Invention] (Means for Solving the Problems) The present invention provides for a specific terminal device among a number of stages of terminal devices connected to an optical star coupler to be connected to a specific wavelength that is not used by other terminal devices; In addition to providing an optical transmitter that transmits an optical signal of An optical wavelength filter is inserted that allows only optical signals of wavelengths to pass through, thereby allowing optical transmission to be carried out between the specific terminal devices and to other terminal devices independently.
（作用）
この結果、各端末装置に光合分波器等の構成が複雑で大
形かつ高価な光学系を設ける必要かなくなり、これによ
り端末装置の簡単化および小形化が図れるとともに経済
的にも有利なシステムとすることができる。(Function) As a result, there is no need to provide a complex, large, and expensive optical system such as an optical multiplexer/demultiplexer in each terminal device, which makes it possible to simplify and downsize the terminal device, and also to improve economic efficiency. It can be an advantageous system.
（実施例）
第１図は、本発明の一実施例における光伝送方式を適用
した光通信システムの構成を示すもので、前記第３図と
同一部分には同一符号を付しである。(Embodiment) FIG. 1 shows the configuration of an optical communication system to which an optical transmission system according to an embodiment of the present invention is applied, and the same parts as in FIG. 3 are given the same reference numerals.
各端末装置１０’ 、２０’ 、３０’ 、４０’ は
、それぞれ所定波長の光信号を発生する光送信器１１．
２１，３１．．４１と、自装置の光送信器が発生する光
信号と同波長の光信号のみを受信する先受信器１２，２
２，３２．４２とを備えている。Each terminal device 10', 20', 30', 40' has an optical transmitter 11.
21, 31. ．． 41, and first receivers 12 and 2 that receive only the optical signal of the same wavelength as the optical signal generated by the optical transmitter of the own device.
2, 32, and 42.
このうち光受信器１２，２２，３２．４２は、それぞれ
受光素子１３．２３，３３．４３と、その光入射側に配
置される波長選択性を何する光波長フィルタ１４，２４
，３４．４４とから構成され、これらの受光素子１３．
２３，３３．４３および光波長フィルタ１４，２４，３
４．４４は、例えば光受信器１２を代表して示すと第２
図に示す如くレセプタクル１５内に収容された状態で一
体化されている。尚、第２図の１６．１７はそれぞれ光
信号を導入する光ファイバおよびそのフェルールを小し
ている。Of these, the optical receivers 12, 22, 32.42 each include a light receiving element 13.23, 33.43, and an optical wavelength filter 14, 24 having a wavelength selectivity arranged on the light incident side thereof.
, 34, 44, and these light receiving elements 13.
23, 33, 43 and optical wavelength filters 14, 24, 3
4.44 represents the optical receiver 12, for example, the second
As shown in the figure, it is housed in a receptacle 15 and integrated. Incidentally, 16 and 17 in FIG. 2 are respectively smaller optical fibers and their ferrules for introducing optical signals.
さて、このＬＸな構成において、例えば端末装置３０’
、４０’間で端末装置１０’ 、２０’ と独立した
光データ伝送を行なう場合には、端末装置３０’ 、４
０’の各光送信器３１．４１から発生される光信号の波
長を端末装置１０’、２０’ の光送信器１１．２１か
ら発生される光信号の波長λ１と異なる値λ２に設定し
、かつ光受信器３２゜４２として上記光送信器３１．４
１が発生する光信号の波長λ２のみを通過させる波長選
択特性を有する光波長フィルタ３４．４４が組込まれた
ものを用意する。尚、端末装置１０’、２０’の光受信
器１２．２２には、波長λ１のみを通過させる波長選択
特性を有する光波長フィルタ１４゜２４を組込んだもの
を用意する。Now, in this LX configuration, for example, the terminal device 30'
, 40', when performing optical data transmission independent of the terminal devices 10', 20', the terminal devices 30', 40'
The wavelength of the optical signal generated from each optical transmitter 31.41 of terminal device 10', 20' is set to a value λ2 different from the wavelength λ1 of the optical signal generated from optical transmitter 11.21 of terminal device 10', 20'. and the optical transmitter 31.4 as the optical receiver 32°42.
An optical wavelength filter 34, 44 having wavelength selection characteristics that allows only the wavelength λ2 of the optical signal generated by the optical signal λ2 to pass through is prepared. The optical receivers 12 and 22 of the terminal devices 10' and 20' are equipped with optical wavelength filters 14 and 24 having wavelength selection characteristics that allow only the wavelength λ1 to pass.
この状態で、例えば端末装置３０’が端末装置４０′宛
てに光データ（波長λ２）を送信すると、この光データ
は光スターカプラ１を経て各端末装置５１０′〜４０’
にそれぞれ伝送されるが、端末装置１０’ 、２０’の
先受ｆ３器１２．２２は波長λ１の光データのみを受信
可能となっているため、」１記端末装置３０′から送信
された波長λ２の先データは除去されて受光素子１３．
２３には受光されない。これに対し端末装置４０′の光
受信器４２は、波長λ２の光データを通過して受光する
ようになっているため、」−記端末装置３０’からの光
データは受光素子４３で受光される。以−１−の伝送動
作は端末装置４０′から端末装置３０′への光データ伝
送についても、全く同様に行なわれる。In this state, for example, when the terminal device 30' transmits optical data (wavelength λ2) to the terminal device 40', this optical data passes through the optical star coupler 1 to each of the terminal devices 510' to 40'.
However, since the pre-receiving F3 devices 12 and 22 of the terminal devices 10' and 20' can receive only the optical data of the wavelength λ1, the wavelength transmitted from the terminal device 30' is The previous data of λ2 is removed and sent to the light receiving element 13.
No light is received at 23. On the other hand, since the optical receiver 42 of the terminal device 40' is designed to pass and receive optical data of wavelength λ2, the optical data from the terminal device 30' is received by the light receiving element 43. Ru. The transmission operation described in -1- below is performed in exactly the same way for optical data transmission from the terminal device 40' to the terminal device 30'.
一方、端末装置１０′または２０′が先データ（波長λ
１）を送信した場合も、光データは光スターカプラ］を
介してそれぞれ全端末装置１０′〜４０′に伝送される
が、上記特定の端末装置３０’ 、４０’の光受信２：
：ｔ３２，４２は波長λ２のみを通過させる光波長フィ
ルタ３４．４４を備えているため、上記端末装置１０’
、２０’からの光データ（波長λ１）は端末装置３０’
４０’では受光されない。したがって、上記特定の端
末装置３０’ 、４０’ は他の端末装置１０′。On the other hand, the terminal device 10' or 20' receives the previous data (wavelength λ
1), the optical data is transmitted to all the terminal devices 10' to 40' via the optical star coupler, respectively.
:t32, 42 are equipped with optical wavelength filters 34, 44 that pass only the wavelength λ2, so that the terminal device 10'
, 20' (wavelength λ1) is transmitted to the terminal device 30'
No light is received at 40'. Therefore, the above-mentioned specific terminal devices 30' and 40' are other terminal devices 10'.
２０′の影響を受けることなく、システム内で独立して
光伝送を行なえる。Optical transmission can be carried out independently within the system without being influenced by 20'.
このように本実施例であれば、特定の端末装置３０’
、４０’が使用する光信号の波長を他の端末装置１０’
、２０’で使用する光信号の波長λ１と異ならせ、かつ
各端末装置１０′〜４０′の光受信器１２〜４２に自装
置か送信した光信号の波長のみを通過させる光波長フィ
ルタ１４〜４４を設けたので、特に端末装置の送受信処
理回路で送信データにアドレス情報を（−Ｊ加したりこ
のアドレス情報を判定するといった電気的な処理を行な
うことなく、特定の端末装置３０’ 、４０’間で他の
端末装置１０’２０’ にデータの内容を知られること
なく独立して光データ伝送を行なうことができる。した
がって、各端末装置１０’ 〜４０′の送受信処理回路
の１，１４成および制御は簡ｊｌｉ化される。In this embodiment, the specific terminal device 30'
, 40' transmit the wavelength of the optical signal used by the other terminal device 10'.
. 44, the transmission/reception processing circuit of the terminal device does not need to perform any electrical processing such as adding address information (-J to the transmitted data or determining this address information). Optical data transmission can be performed independently between the terminal devices 10' and 20' without the data contents being known to the other terminal devices 10' and 20'. configuration and control are simplified.
尚、本発明は上記実施例に限定されるものではない。例
えば、上記実施例では端末装置の光受信器に光波長フィ
ルタを設けたが、光スターカプラの出力ポートに設けて
もよく、また光伝送路中に中継器が設けられている場合
にはこの中継器に、設けてもよい。また前記実施例では
光スターカプラに４個の端末装置を接続した場合につい
て説明したか、３個または５個以上の端末装置を接続し
た場合でも同様に実施できる。さらに、各々複数の端末
装置が接続されたｋＶ ｆｉの光スターカプラ間を光伝
送路で接続した通信システムであっても同様に実施可能
である。ところで、上記実施例では簡単化されたシステ
ム構成を示したが、例えば同一波長を取扱う端末装置数
を３個以上とし、アドレス情報を付加することにより各
端末装置を判別するようなシステム（１４成とすること
も可能であり、また従来のような光合分波器を用いた端
末袋；ｉｔが混在するシステムに本発明の方式を適用し
たシステム（端末装置等）を導入することも可能である
。Note that the present invention is not limited to the above embodiments. For example, in the above embodiment, an optical wavelength filter is provided in the optical receiver of the terminal device, but it may also be provided in the output port of the optical star coupler, or if a repeater is provided in the optical transmission path, this filter may be provided in the optical receiver. It may be provided in a repeater. Further, in the above embodiment, the case where four terminal devices are connected to the optical star coupler has been described, but the same implementation can be made even when three or five or more terminal devices are connected. Furthermore, the present invention can be similarly implemented in a communication system in which kV fi optical star couplers each connected to a plurality of terminal devices are connected by an optical transmission line. By the way, although the above embodiment shows a simplified system configuration, for example, a system (14 configurations) in which the number of terminal devices that handle the same wavelength is three or more and each terminal device is distinguished by adding address information. It is also possible to introduce a system (terminal device, etc.) to which the method of the present invention is applied to a system in which a conventional terminal bag using an optical multiplexer/demultiplexer and IT are mixed. .
その他、光受信器の構成や光信号の波長の種類や数″、
５についても、本発明の要旨を逸脱しない範囲で種々変
形して実施できる。In addition, the configuration of the optical receiver, the type and number of wavelengths of the optical signal,
5 can also be implemented with various modifications without departing from the gist of the present invention.
［発明の効！！！］
以上詳述したように本発明によれば、光スターカプラに
接続されるＪＳ２数の端末装置のうち特定の端末装置に
他の端末装置が使用しない特定波長の光信号を送信する
光送信器を設けるとともに、上記各端末装置が接続され
る光スターカプラの出力ポートから各端末装置の受光素
子までの光伝送路中にそれぞれ自己の端末装置が使用す
る波長の光信号のみを通過させる光波長フィルタを介挿
し、これにより上記特定端末装置間で他の端末と独立し
て光伝送を行なうようにしたことによって、簡単で小形
かつ安価な構成で端末装置間の光データ伝送を行ない得
る光伝送方式を提供することができる。[Efficacy of invention! ! ! ] As detailed above, according to the present invention, an optical transmitter transmits an optical signal of a specific wavelength that is not used by other terminal devices to a specific terminal device among the JS2 number of terminal devices connected to the optical star coupler. and an optical wavelength that allows only the optical signal of the wavelength used by each terminal device to pass through the optical transmission path from the output port of the optical star coupler to which each terminal device is connected to the light receiving element of each terminal device. Optical transmission that enables optical data transmission between terminal devices with a simple, compact, and inexpensive configuration by inserting a filter and thereby performing optical transmission between the specific terminal devices independently from other terminals. method can be provided.
第１図は本発明の一実施例における光伝送方式を適用し
た光通信システムの概略（１１１成図、第２図は同シス
テムの各端末装置において使用する光受信器の構造を示
す断面図、第３図は従来の光伝送方式を説明するための
光通信システムの概略構成図である。
１・・・先スターカプラ、２・・・光伝送路、１０′。
２０’ 、３０’ 、４０’ ・・・端末装置、１１，
２１゜３１．４１・・・光送信器、１２，２２．３２．
４２・・・光受信器、１３．２′う、３３．４３・・・
受光素子、１４．２４．３４．４４・・・光波長フィル
タ、１５・・・レセプタクル、１６・・・光ファイバ、
１７・・・フェルール。
出願人代理人 弁理士 鈴江武彦
２０’
第１図
第２図FIG. 1 is a schematic diagram (111 diagram) of an optical communication system to which an optical transmission system according to an embodiment of the present invention is applied, and FIG. 2 is a sectional view showing the structure of an optical receiver used in each terminal device of the system. FIG. 3 is a schematic configuration diagram of an optical communication system for explaining a conventional optical transmission system. 1... Star coupler, 2... Optical transmission line, 10'. 20', 30', 40. '...terminal device, 11,
21°31.41... Optical transmitter, 12,22.32.
42... Optical receiver, 13.2', 33.43...
Light receiving element, 14.24.34.44... Optical wavelength filter, 15... Receptacle, 16... Optical fiber,
17... Ferrule. Applicant's agent Patent attorney Takehiko Suzue 20' Figure 1 Figure 2
Claims (2)
の光伝送を行なう光伝送方式において、前記複数の端末
装置のうち特定の端末装置に他の端末装置が使用しない
特定波長の光信号を送信する光送信器を設けるとともに
、前記各端末装置が接続される光スターカプラの出力ポ
ートから各端末装置の受光素子までの光伝送路中にそれ
ぞれ自己の端末装置が使用する波長の光信号のみを通過
させる光波長フィルタを介挿し、前記特定端末装置間で
他の端末装置とは独立して光伝送を行なうようにしたこ
とを特徴とする光伝送方式。(1) In an optical transmission system in which information is optically transmitted between multiple terminal devices via an optical star coupler, an optical signal of a specific wavelength not used by other terminal devices is sent to a specific terminal device among the multiple terminal devices. In addition, an optical signal of the wavelength used by each terminal device is provided in the optical transmission path from the output port of the optical star coupler to which each terminal device is connected to the light receiving element of each terminal device. An optical transmission method characterized in that an optical wavelength filter is inserted to allow only the specified terminal devices to pass through, so that optical transmission is performed between the specific terminal devices independently of other terminal devices.
的に設けたことを特徴とする特許請求の範囲第（１）項
記載の光伝送方式。(2) An optical transmission system according to claim (1), characterized in that an optical wavelength filter is provided integrally with a light receiving element within a terminal device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61235662A JPS6390229A (en) | 1986-10-03 | 1986-10-03 | Optical transmission system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61235662A JPS6390229A (en) | 1986-10-03 | 1986-10-03 | Optical transmission system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6390229A true JPS6390229A (en) | 1988-04-21 |
Family
ID=16989335
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61235662A Pending JPS6390229A (en) | 1986-10-03 | 1986-10-03 | Optical transmission system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6390229A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5854699A (en) * | 1993-07-30 | 1998-12-29 | Gte Laboratories Incorporated | Multiplexed subcarrier control in wavelength division multiplexed broadband networks |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4830765A (en) * | 1971-08-19 | 1973-04-23 | ||
| JPS5698949A (en) * | 1980-01-10 | 1981-08-08 | Toshiba Corp | Star communication network with wave length multiplex light |
-
1986
- 1986-10-03 JP JP61235662A patent/JPS6390229A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4830765A (en) * | 1971-08-19 | 1973-04-23 | ||
| JPS5698949A (en) * | 1980-01-10 | 1981-08-08 | Toshiba Corp | Star communication network with wave length multiplex light |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5854699A (en) * | 1993-07-30 | 1998-12-29 | Gte Laboratories Incorporated | Multiplexed subcarrier control in wavelength division multiplexed broadband networks |
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