JPH03179940A - Bidirectional transmission method between multiple points - Google Patents
Bidirectional transmission method between multiple pointsInfo
- Publication number
- JPH03179940A JPH03179940A JP1317632A JP31763289A JPH03179940A JP H03179940 A JPH03179940 A JP H03179940A JP 1317632 A JP1317632 A JP 1317632A JP 31763289 A JP31763289 A JP 31763289A JP H03179940 A JPH03179940 A JP H03179940A
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- JP
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- Prior art keywords
- optical
- station
- stations
- transmission
- amplifier
- 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.)
- Granted
Links
- 230000005540 biological transmission Effects 0.000 title claims description 83
- 230000002457 bidirectional effect Effects 0.000 title claims description 30
- 238000000034 method Methods 0.000 title claims description 17
- 230000003287 optical effect Effects 0.000 claims description 187
- 150000002500 ions Chemical class 0.000 claims description 13
- 230000005284 excitation Effects 0.000 claims description 6
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 5
- 230000006854 communication Effects 0.000 description 5
- 238000004891 communication Methods 0.000 description 5
- 239000013307 optical fiber Substances 0.000 description 4
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 229910052691 Erbium Inorganic materials 0.000 description 1
- 229910052689 Holmium Inorganic materials 0.000 description 1
- 229910052779 Neodymium Inorganic materials 0.000 description 1
- 229910052772 Samarium Inorganic materials 0.000 description 1
- 229910052775 Thulium Inorganic materials 0.000 description 1
- 230000007175 bidirectional communication Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
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- Optical Communication System (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は複数地点間で双方向伝送する場合に、それぞれ
の地点から送信されてきた光信号を一つの増幅器によっ
て一括して増幅することができる双方向伝送方法及びそ
の装置に関するものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention is capable of amplifying optical signals transmitted from each point all at once using a single amplifier when performing bidirectional transmission between multiple points. The present invention relates to a bidirectional transmission method and device that can perform the same.
［従来の技術］
複数地点間でそれぞれに双方向伝送する光通信システム
の出現が強く望まれるようになってきた。この光通信シ
ステムを実現する上では、光信号をそれぞれの地点へ分
配する必要があるか、その際、分配された光信号レベル
の低下を余儀なくされるために、分配数か制限されたり
、伝Ｗｊ、距離が短くなったりする。これを改善するた
めには光信号を光のまま直接増幅する“光増幅器′。[Prior Art] There has been a strong desire for an optical communication system that performs bidirectional transmission between multiple points. In order to realize this optical communication system, it is necessary to distribute optical signals to each point, or in that case, the number of distributed optical signals must be limited or the number of optical signals transmitted must be reduced because the level of the distributed optical signals must be lowered. Wj, the distance becomes shorter. To improve this, an "optical amplifier" is used that directly amplifies the optical signal as it is.
を導入していかなけれはならない。must be introduced.
第４図は」二記光増幅器を用いた３地点間（ＡＢ、及び
Ｃ）の光通信方式の従来例を示したものである。この方
式においては、各地点に送信光周波数（または送信波長
）が個別に割り当てられ、各地点から送られてきた光信
号によるクロストークの劣化を抑制する構成になってい
る。FIG. 4 shows a conventional example of an optical communication system between three points (AB and C) using two optical amplifiers. In this system, a transmission optical frequency (or transmission wavelength) is individually assigned to each point, and the structure is such that deterioration of crosstalk caused by optical signals sent from each point is suppressed.
［発明が解決しようとする課題］
従来の３地点間光通信方式によれば、Ａ地点とＣ地点間
、Ｂ地点とＣ地点間で双方向伝送でき、しかも光増幅器
によって増幅された後、所望地点に到達する。しかし、
この方式ではＡ地点とＢ地点間は双方向通信を行うこと
ができないという問題点がある。そのために、各地点間
の伝送距離を長くとることができない。また各地点間の
距離もバラバラになるので、光受信器の光受信レベルが
不安定になるという問題もあった。[Problems to be Solved by the Invention] According to the conventional three-point optical communication system, bidirectional transmission is possible between points A and C and between points B and C, and after being amplified by an optical amplifier, the desired reach a point. but,
This method has a problem in that bidirectional communication cannot be performed between point A and point B. Therefore, it is not possible to increase the transmission distance between each point. Furthermore, since the distances between each point vary, there is also the problem that the optical reception level of the optical receiver becomes unstable.
本発明の目的は、前記した従来技術の問題点を解消し、
複数地点間を一つの光増幅器を介して双方向伝送できる
ようにした伝送方式およびその装置を提供することにあ
る。The purpose of the present invention is to solve the problems of the prior art described above,
An object of the present invention is to provide a transmission system and a device thereof that enable bidirectional transmission between multiple points via one optical amplifier.
［課題を解決するための手段］
本発明の複数地点間双方向伝送方法は、光増幅器の一方
の端子側に、Ｎ個（Ｎは３以上の整数）の局Ａ、Ｂ、Ｃ
，Ｄ・・・、Ｚのうちの■局Ｂを除く他の全ての局Ａ、
Ｃ，Ｄ、・・・Ｚからの光伝送路を結合させて接続し、
該光増幅器の他方の端子側に上記除かれた１局Ｂからの
光伝送路及びそれ以外の局中の任意の１局Ａを除くＮ−
１個の局からの光伝送路を結合させて接続し、それぞれ
の局間で双方向伝送するものである。[Means for Solving the Problems] The multi-point bidirectional transmission method of the present invention provides N stations A, B, and C (N is an integer of 3 or more) on one terminal side of an optical amplifier.
, D..., all other stations A except station B among Z,
Combine and connect the optical transmission lines from C, D,...Z,
On the other terminal side of the optical amplifier, there is an optical transmission line from the one station B excluded above and an arbitrary one of the other stations N- except for one station A.
Optical transmission lines from one station are combined and connected to allow bidirectional transmission between each station.
この複数地点間双方向伝送方法においては、それぞれの
局が少なくとも１つの光伝送部と光受信部を有し、該そ
れぞれの光送信部か異なった光周波数の光信号を送信し
、それぞれの光受信部が光周波数を選択的にチューニン
グして受信できる機能を有する形態とすることかできる
。尚、局の数Ｎについては格別な制約はなく、例えば３
つからなることできる。In this multi-point bidirectional transmission method, each station has at least one optical transmitter and an optical receiver, and each optical transmitter transmits optical signals of different optical frequencies, and each station has at least one optical transmitter and an optical receiver. The receiver may have a function of selectively tuning and receiving optical frequencies. There is no particular restriction on the number N of stations; for example, 3
It is possible to do many things.
また、それぞれの局からの光伝送路の一部、光増幅器、
光増幅器からそれぞれの局までの光伝送路の一部を、希
土類元素イオンを添加したｎポート対ｍポート型光スタ
ーカプラ（ｎ、ｍ：≧３）と該ポートの先端の少なくと
も一つに励起光源を設けた構成で代用することもできる
。この場合において、希土類元素イオンとして、Ｅｒイ
オンを用い、各光送信部の光信号の波長として１．５μ
ｍ帯を用いることができる。Also, part of the optical transmission line from each station, optical amplifier,
A part of the optical transmission line from the optical amplifier to each station is pumped by an n-port to m-port optical star coupler (n, m: ≧3) doped with rare earth element ions and at least one of the tips of the ports. A configuration including a light source can also be used instead. In this case, Er ions are used as rare earth element ions, and the wavelength of the optical signal of each optical transmitter is 1.5μ.
m band can be used.
次に、装置として構成する場合は、少なくとも１組の光
送信部と光受信部を備えたＮ個（Ｎは３以上の整数）の
局と、これらの局からの少なくとも４つの光伝送路と、
１つの光増幅器を備え、任意の１局を除く他の全ての局
からの光伝送路を上記光増幅器の一方の端子側に結合さ
せて接続し、上記除かれた１局からの光伝送路及びそれ
以外の局中の任意の１局を除くＮ−１個の局からの光伝
送路を上記光増幅器の他方の端子側に結合させて接続し
て、構成することかできる。Next, when configured as a device, there are N stations (N is an integer of 3 or more) each equipped with at least one set of an optical transmitter and an optical receiver, and at least four optical transmission lines from these stations. ,
One optical amplifier is provided, and optical transmission lines from all stations except one arbitrary station are coupled and connected to one terminal side of the optical amplifier, and an optical transmission line from one station excluded from the above is connected. Optical transmission lines from N-1 stations excluding any one of the other stations may be coupled and connected to the other terminal side of the optical amplifier.
［作用コ
上記のように本発明は、光増幅器の一方の端子側に局Ａ
測９局ＣＩＩＦＪ 、局り醐等の光伝送路を結合させて
接続し、光増幅器のもう一方の端子側に局Ｂ側、局Ｃ測
１局り測などの光伝送路を結合させて接続した構成とし
たものである。そして、それぞれの光伝送路の先端には
光送信部と光受信部が接続され、各光送信部は異なった
光周波数の光信号を送信し、各光受信部はそれぞれの光
周波数を選択的にチューニングして受信できる機能を有
しているものである。このような構成とすることにより
、少なくとも３地点間で双方向通信を実現さ已゛ること
かできる。[Operations] As described above, the present invention has a station A on one terminal side of the optical amplifier.
Connect the optical transmission lines of 9 stations CIIFJ, 1 station, etc. to the other terminal side of the optical amplifier, and connect the optical transmission lines of 9 stations CIIFJ, 1 station C, etc. to the other terminal side of the optical amplifier. The structure is as follows. An optical transmitting section and an optical receiving section are connected to the tip of each optical transmission line, and each optical transmitting section transmits optical signals of different optical frequencies, and each optical receiving section selectively transmits each optical frequency. It has a function that allows you to tune in and receive it. With such a configuration, it is possible to realize two-way communication between at least three points.
例えは、Ａ、１３．Ｃの３ Ｊ、ｉ′Ｊの場合、）ｒｒ
５ Ａから７ｒ−ＸＪＢへは、局Ａの光送信部からの光
信号（光周波数ｆｌ）が光増幅器を通して局Ｂの光受信
部に送られることによって可能であり、逆に局Ｂから局
Ａへの光信号（光周波数ｆ２）の伝送も上記と逆方向の
経路をたどって可能である。Examples are A, 13. In the case of C's 3 J, i'J, )rr
5A to 7r-XJB is possible by sending an optical signal (optical frequency fl) from the optical transmitter of station A to the optical receiver of station B through an optical amplifier, and vice versa. It is also possible to transmit an optical signal (optical frequency f2) to the above-described path in the opposite direction.
次に局Ａから局Ｃへは、局Ａの光送信部からの光信号（
光周波数ｆ１）か、光増幅器を通して局Ｃの光受信部に
送られることによって可能である。Next, from station A to station C, an optical signal (
This is possible by sending the optical frequency f1) to the optical receiver of station C through an optical amplifier.
局Ｃから局Ａの逆の伝送の場合には、局Ｃの光送信部か
らの光信号（光周波数ｆ３）を上述と逆の経路を通って
局Ａの光受信部に送ることに上って可能である。In the case of reverse transmission from station C to station A, the optical signal (optical frequency f3) from the optical transmitter of station C is sent to the optical receiver of station A through the reverse path as described above. It is possible.
同様に、局Ｂと局Ｃ間の双方向伝送も、光増幅器を通る
経路を用いることによって可能である。Similarly, bidirectional transmission between stations B and C is also possible by using a path through an optical amplifier.
上記いずれの局間の双方向伝送も共通の一つの光増幅器
を介して行うだけであり、受信感度も均一なものとなる
。Bidirectional transmission between any of the stations described above is performed only through one common optical amplifier, and the reception sensitivity is also uniform.
［実施例］
第１図に本発明の複数地点間双方向伝送方法及び装置の
実施例を示す。この実施例は局Ａ、Ｅｌ及びＣの３つの
局間を双方向伝送できるようにした構成のものであり、
それぞれの局は少なくとも１つの光送信部及び光受信部
を有している。[Embodiment] FIG. 1 shows an embodiment of the multi-point bidirectional transmission method and apparatus of the present invention. This embodiment has a configuration that allows bidirectional transmission between three stations, stations A, El, and C.
Each station has at least one optical transmitter and one optical receiver.
すなわち、局Ａの光送信部１１と光受信部２１は７分岐
器５１の光結合回路で結合されて光伝送路４１（光ファ
イバ）に接続され、光増幅器３の一方の端子側に入力さ
れている。局Ｂの光送信部１２と光受信部２２も７分岐
器５４の光結合回路で結合されて光伝送路４２（光ファ
イバ）に接続され、光増幅器３の反対の端子側に入力さ
れている。局Ｃについては光増幅器３の一方の端子側と
他方の端子側に、光伝送路４４と４３が接続されている
。すなわち、光送信部１３と光受信部２３を７分岐器５
５．５７で結合して光伝送路４３に接続し、光送信部１
４と光受信部２３を７分岐器５６．５７で結合して光伝
送路４４に接続するように構成されている。各光送信部
１１，１２゜１３．１４は互いに異なった光周波数の光
信号を送信し、各光受信部２１．２２．２３はそれぞれ
の光周波数を選択的にチューニングして受信できる機能
を有している。That is, the optical transmitter 11 and the optical receiver 21 of station A are coupled by the optical coupling circuit of the 7-brancher 51, connected to the optical transmission line 41 (optical fiber), and input to one terminal side of the optical amplifier 3. ing. The optical transmitter 12 and optical receiver 22 of station B are also coupled by the optical coupling circuit of the 7-brancher 54, connected to the optical transmission line 42 (optical fiber), and input to the opposite terminal side of the optical amplifier 3. . Regarding station C, optical transmission lines 44 and 43 are connected to one terminal side and the other terminal side of optical amplifier 3. That is, the optical transmitting section 13 and the optical receiving section 23 are connected to the 7 branching device 5.
5.57 and connects to the optical transmission line 43, and the optical transmitter 1
4 and the optical receiver 23 are coupled by a 7-brancher 56, 57 and connected to the optical transmission line 44. Each optical transmitter 11, 12, 13.14 transmits optical signals of different optical frequencies, and each optical receiver 21, 22, 23 has a function of selectively tuning and receiving each optical frequency. are doing.
上記構成において、双方向伝送は次のように行われる。In the above configuration, bidirectional transmission is performed as follows.
ます局Ａから局Ｂへは、光送信部１１からの光信号（光
周波数ｆ１）を７分岐器５１．光伝送路４１．７分岐器
５２．光増幅器３．Ｙ分岐器５３゜光伝送＃Ｉ４２及び
７分岐器５４を通して光受信部２２に送られることによ
って行われる。逆に局Ｂから局Ａへは、光送信部１２か
らの光信号（光周波数ｆ２）を７分岐器５４．光伝送路
４２．Ｙ分岐器５３．光増幅器３，７分岐器５２．光伝
送路４１．７分岐器５１を通して光受信部２１に送られ
ることによって行われる。From station A to station B, the optical signal (optical frequency f1) from the optical transmitter 11 is sent through a 7-brancher 51. Optical transmission line 41.7 splitter 52. Optical amplifier 3. This is done by sending the signal to the optical receiver 22 through the Y-brancher 53° optical transmission #I 42 and the 7-brancher 54. Conversely, from station B to station A, the optical signal (optical frequency f2) from the optical transmitter 12 is sent to the 7-brancher 54. Optical transmission line 42. Y branch 53. Optical amplifiers 3, 7 splitter 52. This is done by sending the optical signal to the optical receiver 21 through the optical transmission line 41.7 and the splitter 51.
次に局Ａから局Ｃへは、光送信部１１からの光信号（光
周波数ｆｌ）を７分岐器５１．光伝送路４１．７分岐器
５２．光増幅器３．Ｙ分岐器５３゜光伝送路４３．Ｙ分
岐器５５及び５７を通して光受信部２３に送ることによ
って行われる。局Ｃから局Ａの逆の伝送の場合には、光
送信部１３がらの光信号（光周波数ｆ３）を上述と逆の
経路を通って光受信部２１に送ることによって行われる
。Next, from the station A to the station C, the optical signal (optical frequency fl) from the optical transmitter 11 is sent to the 7-brancher 51. Optical transmission line 41.7 splitter 52. Optical amplifier 3. Y brancher 53° optical transmission line 43. This is done by sending the signal to the optical receiver 23 through the Y splitters 55 and 57. In the case of reverse transmission from station C to station A, this is done by sending the optical signal (optical frequency f3) from the optical transmitter 13 to the optical receiver 21 through the opposite path to that described above.
同様に、局Ｂと局Ｃ間の双方向伝送は、７分岐器５４．
光伝送路４２．Ｙ分岐器５３．光増幅器３．７分岐器５
２．光伝送路４４．Ｙ分岐器５６の経路を用いることに
よって行われる。すなわち、０
いずれの局間の双方向伝送も共通の一つの光増幅器３を
介して行われる。Similarly, bidirectional transmission between station B and station C is carried out by 7 splitters 54.
Optical transmission line 42. Y branch 53. Optical amplifier 3.7 splitter 5
2. Optical transmission line 44. This is done by using the Y-branch 56 path. That is, 0. Bidirectional transmission between all stations is performed via one common optical amplifier 3.
第２図は４つの局Ａ、Ｂ、Ｃ，Ｄ間での双方向伝送方法
及び装置構成の実施例を示したものである。第１図と異
なる点は、第１図の７分岐器５２及び５３の代わりに、
３分岐器６１．６２を設け、その伝送路４６．４５によ
って局ｄを追加的に接続したところにある。この局りは
、局Ｃと同様に、光送信部１５と光受信部２４を７分岐
器５８゜６０で結合して光伝送＃１４５に接続し、光送
信部１６と光受信部２４を７分岐器５９．６０で結合し
て光伝送路４６に接続した楕或となっている。FIG. 2 shows an embodiment of a bidirectional transmission method and device configuration between four stations A, B, C, and D. The difference from FIG. 1 is that instead of the 7 branchers 52 and 53 in FIG.
A three-way splitter 61,62 is provided, and the station d is additionally connected to the transmission line 46,45. Similar to station C, this station connects the optical transmission section 15 and the optical reception section 24 with a 7-way splitter 58°60 and connects it to optical transmission #145, and connects the optical transmission section 16 and the optical reception section 24 They are combined by splitters 59 and 60 to form an ellipse connected to the optical transmission line 46.
これにより、局Ａと局り１局Ｂと局り１局Ｃと局り１局
Ａと局Ｂ１局Ａと局Ｃ１局Ｂと局Ｃ間の双方向伝送を実
現することができる。Thereby, bidirectional transmission between station A, station 1 station B, station 1 station C, station 1 station A, station B, station A and station C, station B and station C can be realized.
５つ以上の局間での双方向伝送を実現させるには、第２
図の３分岐器６１及び６２を４分岐器。In order to realize bidirectional transmission between five or more stations, the second
The 3-branchers 61 and 62 in the figure are replaced by 4-branchers.
５分岐器、・・・１等のように分岐数を増やすことによ
って可能となる。This becomes possible by increasing the number of branches such as 5 branchers, . . . 1 branch, etc.
なお、上記実施例において、光送信部には反射１
戻り光を抑圧するための光アイソレータを内蔵させてお
いてもよい。また光受信部の構成は可変光周波数フィル
タ、光増幅器などを含む構成のもの、あるいは光ヘテロ
ゲインまたは光ホモダイン検波方式を用いた構成のもの
であってもよい。光増幅器としては、半導体レーザー増
幅器（共振形、進行波形など）、光フアイバー増幅器を
用いることができる。In the above embodiment, the optical transmitter may include an optical isolator for suppressing the reflected light. Further, the configuration of the optical receiving section may include a variable optical frequency filter, an optical amplifier, etc., or a configuration using an optical heterogain or optical homodyne detection method. As the optical amplifier, a semiconductor laser amplifier (resonant type, traveling wave type, etc.) or an optical fiber amplifier can be used.
第３図は本発明の複数地点間双方向伝送方法及び装置の
別の実施例を示したものである。これはＡ、Ｂ及びＣの
３地点間での双方向伝送方向及び装置構成を示したもの
であり、第１図の７分岐器５２及び５３．光増幅器３の
代わりに、Ｅｒイオンを添加したｎポート対ｍポート（
ｎ、ｍ：≧３）型光スターカプラ７、励起光源８１及び
８２．光伝送路４７及び４８を用いて構成したものであ
る。FIG. 3 shows another embodiment of the multi-point bidirectional transmission method and apparatus of the present invention. This shows the bidirectional transmission direction and device configuration between the three points A, B, and C, and is the same as the seven branchers 52 and 53 . Instead of the optical amplifier 3, an n-port to m-port doped with Er ions (
n, m:≧3) type optical star coupler 7, excitation light sources 81 and 82. It is constructed using optical transmission lines 47 and 48.
励起光源が２つ用いられているが１個でもよい。Although two excitation light sources are used, one excitation light source may be used.
この構成では、光送信部の波長帯には１．５３〜１．５
６μｍ帯が用いられる。また、励起光源の波長には０．
９８μｍ、１．４６〜１，４８μｍ、あるいは０．８３
２
μｍ、 ０．５１μｍ、 ０．６５）ｔｍなどが用いら
れる。In this configuration, the wavelength band of the optical transmitter is 1.53 to 1.5.
A 6 μm band is used. Also, the wavelength of the excitation light source is 0.
98 μm, 1.46-1,48 μm, or 0.83
2 μm, 0.51 μm, 0.65)tm, etc. are used.
上記Ｅｒイオンを添加した光スターカプラ７は、光フア
イバ型、あるいは導波路型のいずれであってもよい。ま
た、Ｅ ｒイオン以外にＹｂ。The optical star coupler 7 doped with Er ions may be either an optical fiber type or a waveguide type. In addition to E r ions, Yb.
Ｎｄなとのイオンを共添加したものを用いてもよい。ま
た上記光スターカプラ７内に添加する希土類元素イオン
は、光送信部の送信波長によって異なり、Ｅｒ、Ｎｄ、
Ｓｍ、Ｈｏ、Ｔｍ。A material co-doped with ions such as Nd may also be used. The rare earth element ions added to the optical star coupler 7 vary depending on the transmission wavelength of the optical transmitter, and include Er, Nd,
Sm, Ho, Tm.
Ｙｂなどのイオンを少なくとも一種含んだものを用いる
ことができる。さらに光スターカプラ７の入出力ポート
数を増やし、励起光源をさらに増やし、光増幅器のゲイ
ンを増大させるようにしてもよい。A material containing at least one type of ion such as Yb can be used. Furthermore, the number of input/output ports of the optical star coupler 7 may be increased, the number of pumping light sources may be further increased, and the gain of the optical amplifier may be increased.
［発明の効果］
以上のように、本発明によれば少なくとも３地点間を一
つの光増幅器を介して双方向伝送することができるので
、長距離で、かつ、光受信器の受信感度も均一に保つこ
とができる。[Effects of the Invention] As described above, according to the present invention, bidirectional transmission can be performed between at least three points via one optical amplifier, so that the receiving sensitivity of the optical receiver is uniform over long distances. can be kept.
第１図〜第３図はそれぞれ本発明の複数地点３
間双方伝送方法及び装置の実施例を示した図、第４図は
従来の複数地点間双方向伝送システムの構成を示した図
である。
図中、３は光増幅器、１１〜１６は光送信部、２１〜２
４は光受信部、４１〜４６は送伝送路、５１〜６０は７
分岐器、６１．６２は３分岐器、７はＥｒイオンを添加
した光スターカプラ、８１゜８２は励起光源を示す。1 to 3 are diagrams showing embodiments of the method and device for two-way transmission between multiple points 3 of the present invention, respectively, and FIG. 4 is a diagram showing the configuration of a conventional two-way transmission system between multiple points. . In the figure, 3 is an optical amplifier, 11 to 16 are optical transmitters, and 21 to 2
4 is an optical receiver, 41 to 46 are transmission lines, and 51 to 60 are 7.
61 and 62 are three-branchers, 7 is an optical star coupler doped with Er ions, and 81 and 82 are excitation light sources.
Claims (1)
数）の局Ａ，Ｂ，Ｃ，Ｄ・・・，Ｚのうちの１局Ｂを除
く他の全ての局Ａ，Ｃ，Ｄ，・・・Ｚからの光伝送路を
結合させて接続し、該光増幅器の他方の端子側に上記除
かれた１局Ｂからの光伝送路及びそれ以外の局中の任意
の１局Ａを除くＮ−１個の局からの光伝送路を結合させ
て接続し、それぞれの局間で双方向伝送することを特徴
とする複数地点間双方向伝送方法。 ２、請求項１記載の複数地点間双方向伝送方法において
、それぞれの局が少なくとも１つの光伝送部と光受信部
を有し、それぞれの光送信部が異なった光周波数の光信
号を送信し、それぞれの光受信部が光周波数を選択的に
チューニングして受信できる機能を有していることを特
徴とする複数地点間双方向伝送方法。 ３、請求項１記載の複数地点間双方向伝送方法において
、局の数Ｎは３つからなることを特徴とする複数地点間
双方向伝送方法。 ４、請求項１，２又は３記載の複数地点間双方向伝送方
法において、それぞれの局からの光伝送路の一部、光増
幅器、光増幅器からそれぞれの局までの光伝送路の一部
を、希土類元素イオンを添加したｎポート対ｍポート型
光スターカプラ（ｎ，ｍ：≧３）と該ポートの先端の少
なくとも一つに励起光源を設けた構成で代用したことを
特徴とする複数地点間双方向伝送方法。 ５、請求項４記載の複数地点間双方向伝送方法において
、希土類元素イオンとしてＥｒイオンを用い、各光送信
部の光信号の波長として１．５μｍ帯を用いたことを特
徴とする複数地点間双方向伝送方法。 ６、少なくとも１組の光送信部と光受信部を備えたＮ個
（Ｎは３以上の整数）の局と、これらの局からの少なく
とも４つの光伝送路と、１つの光増幅器を備え、任意の
１局を除く他の全ての局からの光伝送路を上記光増幅器
の一方の端子側に結合させて接続し、上記除かれた１局
からの光伝送路及びそれ以外の局中の任意の１局を除く
Ｎ−１個の局からの光伝送路を上記光増幅器の他方の端
子側に結合させて接続したことを特徴とする複数地点間
双方向伝送装置。[Claims] 1. On one terminal side of the optical amplifier, among N stations A, B, C, D..., Z, except for one station B, The optical transmission lines from all the stations A, C, D, ... A multi-point bidirectional transmission method characterized by combining and connecting optical transmission lines from N-1 stations excluding any one station A among the stations, and performing bidirectional transmission between each station. . 2. In the multi-point bidirectional transmission method according to claim 1, each station has at least one optical transmission section and one optical reception section, and each optical transmission section transmits optical signals of different optical frequencies. A two-way transmission method between multiple points, characterized in that each optical receiver has a function of selectively tuning and receiving an optical frequency. 3. The multi-point bidirectional transmission method according to claim 1, wherein the number N of stations is three. 4. In the multi-point bidirectional transmission method according to claim 1, 2 or 3, a part of the optical transmission line from each station, an optical amplifier, and a part of the optical transmission line from the optical amplifier to each station are , a plurality of points characterized in that an n-port to m-port optical star coupler (n, m: ≧3) doped with rare earth element ions and a configuration in which an excitation light source is provided at at least one tip of the port are used instead. Two-way transmission method between. 5. The method for bidirectional transmission between multiple points according to claim 4, characterized in that Er ions are used as the rare earth element ions, and a 1.5 μm band is used as the wavelength of the optical signal of each optical transmitter. Bidirectional transmission method. 6. N stations (N is an integer of 3 or more) each having at least one set of an optical transmitter and an optical receiver, at least four optical transmission lines from these stations, and one optical amplifier; Optical transmission lines from all stations except one arbitrary station are coupled and connected to one terminal side of the optical amplifier, and the optical transmission lines from the one station excluded above and those in other stations are connected. A bidirectional transmission device between multiple points, characterized in that optical transmission lines from N-1 stations excluding any one station are coupled and connected to the other terminal side of the optical amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1317632A JP2697208B2 (en) | 1989-12-08 | 1989-12-08 | Two-way transmission between multiple points |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1317632A JP2697208B2 (en) | 1989-12-08 | 1989-12-08 | Two-way transmission between multiple points |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03179940A true JPH03179940A (en) | 1991-08-05 |
| JP2697208B2 JP2697208B2 (en) | 1998-01-14 |
Family
ID=18090327
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1317632A Expired - Fee Related JP2697208B2 (en) | 1989-12-08 | 1989-12-08 | Two-way transmission between multiple points |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2697208B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008060780A (en) * | 2006-08-30 | 2008-03-13 | Nippon Telegr & Teleph Corp <Ntt> | Optical transmission system and optical demultiplexer |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5039403A (en) * | 1973-07-05 | 1975-04-11 | ||
| JPS57154955A (en) * | 1981-03-19 | 1982-09-24 | Nec Corp | Optical broadcast communication network |
-
1989
- 1989-12-08 JP JP1317632A patent/JP2697208B2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5039403A (en) * | 1973-07-05 | 1975-04-11 | ||
| JPS57154955A (en) * | 1981-03-19 | 1982-09-24 | Nec Corp | Optical broadcast communication network |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008060780A (en) * | 2006-08-30 | 2008-03-13 | Nippon Telegr & Teleph Corp <Ntt> | Optical transmission system and optical demultiplexer |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2697208B2 (en) | 1998-01-14 |
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