JP3039430B2 - Optical add / drop circuit and optical transmission method - Google Patents
Optical add / drop circuit and optical transmission methodInfo
- Publication number
- JP3039430B2 JP3039430B2 JP9076753A JP7675397A JP3039430B2 JP 3039430 B2 JP3039430 B2 JP 3039430B2 JP 9076753 A JP9076753 A JP 9076753A JP 7675397 A JP7675397 A JP 7675397A JP 3039430 B2 JP3039430 B2 JP 3039430B2
- Authority
- JP
- Japan
- Prior art keywords
- signal light
- wavelength
- optical
- light
- station
- 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
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0201—Add-and-drop multiplexing
- H04J14/0202—Arrangements therefor
- H04J14/0204—Broadcast and select arrangements, e.g. with an optical splitter at the input before adding or dropping
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0201—Add-and-drop multiplexing
- H04J14/0202—Arrangements therefor
- H04J14/0213—Groups of channels or wave bands arrangements
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
- G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
- G02B6/29304—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means operating by diffraction, e.g. grating
- G02B6/29316—Light guides comprising a diffractive element, e.g. grating in or on the light guide such that diffracted light is confined in the light guide
- G02B6/29317—Light guides of the optical fibre type
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
- G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
- G02B6/29346—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means operating by wave or beam interference
- G02B6/29361—Interference filters, e.g. multilayer coatings, thin film filters, dichroic splitters or mirrors based on multilayers, WDM filters
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
- G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
- G02B6/29379—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means characterised by the function or use of the complete device
- G02B6/2938—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means characterised by the function or use of the complete device for multiplexing or demultiplexing, i.e. combining or separating wavelengths, e.g. 1xN, NxM
- G02B6/29382—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means characterised by the function or use of the complete device for multiplexing or demultiplexing, i.e. combining or separating wavelengths, e.g. 1xN, NxM including at least adding or dropping a signal, i.e. passing the majority of signals
- G02B6/29383—Adding and dropping
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0201—Add-and-drop multiplexing
- H04J14/0202—Arrangements therefor
- H04J14/0205—Select and combine arrangements, e.g. with an optical combiner at the output after adding or dropping
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Optical Communication System (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、信号光を分岐、挿
入する機能を有する光分岐挿入装置を主伝送路中に備え
た波長多重光伝送装置に関し、特に、光分岐挿入装置に
おいて分岐されるけ信号光およびこれを通過する通過信
号光の追加を容易にする光伝送装置に関する。また、こ
の装置を用いた光伝送方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for splitting and inserting signal light.
Optical add / drop multiplexer having a function of inserting
Wavelength multiplexing optical transmission equipment, especially for optical add / drop multiplexers
Signal light that is branched in
The present invention relates to an optical transmission device that facilitates addition of light. Also,
And an optical transmission method using the device .
【０００２】[0002]
【従来の技術】従来、光分岐挿入回路１ａを用いた長距
離光伝送システムは、図９に示すような基本構成を備え
ている。すなわち、局舎６から波長多重され、送出され
た複数の波長の信号光が光分岐挿入回路１ａに入力され
る。これらの信号光のうち１または数波長分の信号光は
分波器４により分岐出力として局舎８ａに送出される。
局舎８ａは入力信号と同じ波長の信号を光分岐挿入回路
１ａへ送出する。光分岐挿入回路１ａでは、合波器５が
分波器４を透過した信号光と局舎８ａから入力された信
号光を合波し、局舎７へ送る。2. Description of the Related Art Conventionally, a long-distance optical transmission system using an optical add / drop circuit 1a has a basic configuration as shown in FIG. That is, the signal light of a plurality of wavelengths that has been wavelength-multiplexed and transmitted from the station 6 is input to the optical add / drop circuit 1a. Of these signal lights, the signal light of one or several wavelengths is transmitted to the station 8a by the splitter 4 as a branch output.
The station 8a sends out a signal having the same wavelength as the input signal to the optical add / drop circuit 1a. In the optical add / drop circuit 1a, the multiplexer 5 multiplexes the signal light transmitted through the demultiplexer 4 and the signal light input from the station 8a, and sends the multiplexed signal to the station 7.
【０００３】[0003]
【発明が解決しようとする課題】一般に、長距離光伝送
システムでは、システムを設置した後に、通信容量を増
やす必要が生じることがある。図９に示したシステムで
は、光分岐挿入回路１ａから分岐する分岐路の信号光の
数や光分岐挿入回路１ａを透過する主伝送路の信号光の
数を増加させる場合である。このような場合に、光分岐
挿入回路１ａを一度システムから取り外し、ファイバグ
レーテイングや光バンドパスフィルタなどの部品を特性
の異なるものと交換しなければならない。しかし、光分
岐挿入回路１ａが海底中継システムに適用されている場
合、部品または光分岐挿入回路１ａの交換には多額に費
用が必要である。Generally, in a long-distance optical transmission system, it may be necessary to increase the communication capacity after the system is installed. The system shown in FIG. 9 is a case where the number of signal lights in a branch path branched from the optical add / drop circuit 1a and the number of signal lights in a main transmission path passing through the optical drop / add circuit 1a are increased. In such a case, the optical add / drop circuit 1a must be once removed from the system, and components such as fiber gratings and optical bandpass filters must be replaced with components having different characteristics. However, when the optical add / drop circuit 1a is applied to a submarine repeater system, replacing components or the optical add / drop circuit 1a requires a large amount of cost.
【０００４】本発明の目的は、光分岐挿入回路が適用さ
れた光伝送システムにおいて、光分岐挿入回路を交換し
なくても、システムの設置後に通信容量を増やすことが
できる光分岐挿入回路の構成と該回路を用いた光伝送方
法を提供することにある。An object of the present invention is to provide a configuration of an optical add / drop circuit that can increase the communication capacity after installation of the system in an optical transmission system to which the optical add / drop circuit is applied, without replacing the optical drop / add circuit. And an optical transmission method using the circuit.
【０００５】[0005]
【課題を解決するための手段】上記課題を解決する本発
明の光伝送装置は、入力光信号を第１と第２の出力光に
分波する光分波器と、第１の出力光が入力する高域透過
フィルタと、第２の出力光が入力する低域透過フィルタ
と、前記高域透過フィルタから出力される信号光と他の
入力光とを合波する合波器を備えている。この光分岐挿
入回路を用いて光伝送を行う場合、該光分岐挿入回路の
分岐側から出力する信号光を増やす場合は上記低域透過
フィルタを透過する信号光を送信局から送信し、光分岐
挿入回路を透過する信号光を増やす場合は上記高域透過
フィルタを透過する信号光を送信局から送信する。According to the present invention, there is provided an optical transmission apparatus for splitting an input optical signal into first and second output lights, and an optical splitter for splitting an input optical signal into first and second output lights. A high-pass filter for inputting, a low-pass filter for inputting second output light, and a multiplexer for multiplexing the signal light output from the high-pass filter with other input light. . When optical transmission is performed using this optical add / drop circuit, when increasing the signal light output from the branch side of the optical add / drop circuit, the signal light transmitted through the low-pass filter is transmitted from the transmitting station, and the optical drop is performed. When increasing the signal light transmitted through the insertion circuit, the signal light transmitted through the high-pass filter is transmitted from the transmitting station.
【０００６】次に、本発明の光分岐挿入回路の別の構成
では、入力する光信号を第１と第２の出力光に分波する
光分波器と、第１の出力光が入力する低域透過フィルタ
と、第２の出力光が入力する高域透過フィルタと、前記
低域透過フィルタから出力される信号光と他の入力光と
を合波する合波器を備えている。この光分岐挿入回路を
用いて光伝送を行う場合、該光分岐挿入回路の分岐側か
ら出力する信号光を増やす場合は上記高域透過フィルタ
を透過する信号光を送信局から送信し、光分岐挿入回路
の透過側への信号光を増やす場合は上記低域透過フィル
タを透過する信号光を送信局から送信する。Next, in another configuration of the optical add / drop circuit of the present invention, an optical splitter for splitting an input optical signal into first and second output lights, and the first output light are input. A low-pass filter, a high-pass filter to which the second output light is input, and a multiplexer for multiplexing the signal light output from the low-pass filter with another input light. When optical transmission is performed using the optical add / drop circuit, when increasing the signal light output from the branch side of the optical add / drop circuit, the signal light transmitted through the high-pass filter is transmitted from the transmitting station, When increasing the signal light to the transmission side of the insertion circuit, the signal light transmitted through the low-pass filter is transmitted from the transmitting station.
【０００７】上記光分岐挿入回路へ入力する信号光は波
長多重光であり、各波長の信号光は上記光分岐挿入回路
の高域透過フィルタまたは前記低域透過フィルタのいず
れかのみを通過する。The signal light input to the optical add / drop circuit is wavelength multiplexed light, and the signal light of each wavelength passes through only one of the high-pass filter and the low-pass filter of the optical add / drop circuit.
【０００８】上述の構成および方法を用いることによ
り、本発明では光伝送システムを設置した後、光分岐挿
入装置の光分岐挿入回路やこれを構成する部品を交換す
ることなく、また外部から光分岐挿入回路に対して光分
離のための波長制御をすることなく主伝送路または分岐
路の伝送容量を容易に増加させることができる。By using the above configuration and method, according to the present invention, after the optical transmission system is installed, the optical add / drop circuit of the optical add / drop device and the components constituting the add / drop circuit are not replaced , and the optical add / drop circuit is externally provided. Light component to insertion circuit
The transmission capacity of the main transmission line or the branch line can be easily increased without performing wavelength control for separation .
【０００９】[0009]
【発明の実施の形態】次に、本発明に実施の形態につい
て図面を用いて説明する。図１は本発明の光分岐挿入回
路１ａの基本構成を示す。まず局舎６から複数の波長の
信号光が波長多重され送出される。この波長多重された
信号光は分波器４に入力され、２つに分波される。分波
された一方の信号光は低域透過フィルタ３に入力され、
該信号光のうち所定の数の短波長側の光信号のみが透過
する。この透過光は光分岐挿入回路１ａの分岐路から局
舎８ａに送られる。分波器４で分波された他方の信号光
は高域透過フィルタ２に入力され、該信号光のうち所定
の数の長波長側の光信号のみが透過する。局舎８ａから
は分岐路から入力された信号光と同じ数および波長の光
が光分岐挿入回路１ａへ送出される。高域透過フィルタ
２を透過した信号光と局舎８ａから送出される挿入光
は、合波器５によって合波され、光分岐挿入回路１ａの
出力光として局舎７へ送られる。なお、図１以下の各実
施の形態では、低域透過フィルタとは所定の波長ｃより
短波長の信号光を透過させるフィルタであり、高域透過
フィルタとは上記所定の波長ｃより長波長の信号光を透
過させるフィルタであるものとする。Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a basic configuration of an optical add / drop circuit 1a according to the present invention. First, signal light of a plurality of wavelengths is wavelength-multiplexed and transmitted from the station 6. The wavelength-multiplexed signal light is input to the demultiplexer 4 and split into two. One of the split signal lights is input to the low-pass filter 3, and
Only a predetermined number of optical signals on the short wavelength side of the signal light are transmitted. The transmitted light is sent from the branch of the optical add / drop circuit 1a to the office 8a. The other signal light demultiplexed by the demultiplexer 4 is input to the high-pass filter 2, and only a predetermined number of optical signals on the long wavelength side of the signal light are transmitted. Light having the same number and wavelength as the signal light input from the branch path is transmitted from the office 8a to the optical add / drop circuit 1a. The signal light transmitted through the high-pass filter 2 and the insertion light transmitted from the station 8a are multiplexed by the multiplexer 5 and sent to the station 7 as output light of the optical add / drop circuit 1a. 1 and the following embodiments, the low-pass filter is a filter that transmits signal light having a wavelength shorter than the predetermined wavelength c, and the high-pass filter is a filter that has a longer wavelength than the predetermined wavelength c. It is assumed that the filter transmits signal light.
【００１０】図２は図１の光分岐挿入回路１ａを用いた
光伝送システムの基本動作を示している。例えば局舎６
から波長ｂ、ｄ、ｅ、ｆ（ただし、ｂ＜ｄ＜ｅ＜ｆ）の
４つの信号光が波長多重され送出される。これら４つの
信号光は分波器４で２つに分岐される。分岐光の一方は
低域透過フィルタ３に入力され、波長ｂのみが該フィル
タ３を透過し局舎８ａに送られる。分波器４によって分
岐された他方の信号光は高域透過フィルタ２に入力さ
れ、波長ｄ、ｅ、ｆが透過する。局舎８ａからは波長ｂ
の光が送出される。合波器５は高域透過フィルタ２から
送出される波長ｄ、ｅ、ｆの信号光と局舎８ａから送出
される波長ｂの光を合波する。この結果、光分岐挿入回
路１ａからは局舎６から送出された波長ｂ、ｄ、ｅ、ｆ
の信号光と同じ４つの波長の信号光が局舎７へ送られ
る。FIG. 2 shows a basic operation of an optical transmission system using the optical add / drop circuit 1a of FIG. For example, office building 6
, Four signal lights having wavelengths b, d, e, and f (where b <d <e <f) are wavelength-multiplexed and transmitted. These four signal lights are split into two by the splitter 4. One of the branched lights is input to the low-pass filter 3, and only the wavelength b is transmitted through the filter 3 and sent to the office 8a. The other signal light branched by the demultiplexer 4 is input to the high-pass filter 2, and the wavelengths d, e, and f are transmitted. Wavelength b from the office 8a
Is emitted. The multiplexer 5 multiplexes the signal lights of the wavelengths d, e, and f transmitted from the high-pass filter 2 with the light of the wavelength b transmitted from the station 8a. As a result, the wavelengths b, d, e, and f transmitted from the station 6 from the optical add / drop circuit 1a.
Are transmitted to the station 7 with the same four wavelengths.
【００１１】図３（ａ）、（ｂ）は本発明に用いられる
高域透過フィルタと低域透過フィルタの特性を示す模式
図である。高域透過フィルタは特定の波長ｃより長波長
側の信号光を透過させ、また低域透過フィルタは同じ波
長ｃより短波長側の信号光を透過させる。透過域と阻止
域では例えば約２０から３０ｄＢの差を有している。FIGS. 3A and 3B are schematic diagrams showing characteristics of a high-pass filter and a low-pass filter used in the present invention. The high-pass filter transmits signal light on the longer wavelength side than the specific wavelength c, and the low-pass filter transmits signal light on the shorter wavelength side than the same wavelength c. For example, there is a difference of about 20 to 30 dB between the transmission area and the stop area.
【００１２】図４は図２に示した構成において、光分岐
挿入回路１ａから局舎８ａへの通信容量（すなわち信号
光の数）を増やす場合の例を示している。局舎６は局舎
８ａへ送りたい波長ａを他の波長ｂ、ｄ、ｅ、ｆに加え
て波長多重し光分岐挿入装置１ａへ送出する。これらの
信号光の波長はａ＜ｂ＜ｃ＜ｄ＜ｆの順で長くなってい
る。波長ａの信号光は波長ｂの信号光より短波長なので
低域透過フィルタ３を透過して局舎８ａへ送られる。局
舎８ａは波長ａ、ｂの信号光を光分岐挿入装置１ａへ送
出する。この波長ａ、ｂの信号光は、光分岐挿入回路１
ａにおいて高域透過フィルタ２を透過した波長ｄ、ｅ、
ｆの光と合波され、局舎７へ送出される。FIG. 4 shows an example in which the communication capacity (ie, the number of signal lights) from the optical add / drop circuit 1a to the station 8a is increased in the configuration shown in FIG. The station 6 multiplexes the wavelength a desired to be sent to the station 8a with the other wavelengths b, d, e, and f, and sends it to the optical add / drop multiplexer 1a. The wavelengths of these signal lights are longer in the order of a <b <c <d <f. Since the signal light having the wavelength a is shorter in wavelength than the signal light having the wavelength b, the signal light passes through the low-pass filter 3 and is sent to the station 8a. The station 8a sends out the signal lights of the wavelengths a and b to the optical add / drop multiplexer 1a. The signal lights of the wavelengths a and b are supplied to the optical add / drop circuit 1.
a, the wavelengths d, e, transmitted through the high-pass filter 2;
The light is combined with the light of f and transmitted to the station 7.
【００１３】図５は図２に示した構成において、局舎６
から局舎７への主伝送路の容量を増やす場合の例を示し
ている。局舎６では局舎７へ主伝送路を経由して送出し
たい波長ｇを他の波長ｂ、ｄ、ｅ、ｆに加えて波長多重
し光分岐挿入装置１ａへ送出する。これらの信号光の波
長はｂ＜ｄ＜ｅ＜ｆ＜ｇの順で長くなっている。波長ｇ
の信号光は波長ｆの信号光より長波長なので波長ｄ、
ｅ、ｆの波長の信号光と共に高域透過フィルタ２を透過
する。これら波長ｄ、ｅ、ｆ、ｇの信号光は、局舎８ａ
から送出される波長ｂの信号光と共に合波器５にて合波
され、局舎７へ送出される。FIG. 5 shows a configuration of the station 6 in the configuration shown in FIG.
An example is shown in which the capacity of the main transmission path from the station to the station 7 is increased. In the station 6, the wavelength g to be transmitted to the station 7 via the main transmission path is added to the other wavelengths b, d, e, and f, and the wavelength is multiplexed and transmitted to the optical add / drop multiplexer 1a. The wavelengths of these signal lights are longer in the order of b <d <e <f <g. Wavelength g
Is longer than the signal light of wavelength f, so that the wavelength d,
The light passes through the high-pass filter 2 together with the signal lights of the wavelengths e and f. The signal light having the wavelengths d, e, f, and g is transmitted to the station building 8a.
The signal is multiplexed by the multiplexer 5 together with the signal light of the wavelength b transmitted from the optical network and is transmitted to the station 7.
【００１４】図６は、局舎６と局舎７の間の主伝送路に
本発明の光分岐挿入回路を２台、シリーズに配置した構
成を示す。局舎６と局舎７の間に光分岐挿入回路１ａ、
１ｂを配置し、光分岐挿入回路１ａ、１ｂにはそれぞれ
局舎８ａと局舎８ｂが接続している。FIG. 6 shows a configuration in which two optical add / drop circuits of the present invention are arranged in a series on a main transmission line between a station 6 and a station 7. An optical add / drop circuit 1a between the office 6 and the office 7,
1b, and offices 8a and 8b are connected to the optical add / drop circuits 1a and 1b, respectively.
【００１５】図７は、図６の構成において局舎８ａ、局
舎８ｂへの信号光をさらに１波長分増やす場合を示して
いる。局舎６において、もっとも短波長である波長ｂの
信号光よりさらに短波長ａの信号光を加えて送出する。
この波長ａの信号光は波長ｂの信号光と共に、低域透過
フィルタを透過して局舎８ａ、局舎８ｂに送られる。局
舎８ａ、局舎８ｂからはそれぞれ波長ａ、ｂの信号光が
光分岐挿入回路へ送出される。したがって、局舎６が送
出した波長ａ、ｂ、ｄ、ｅ、ｆの信号光が局舎７へ送ら
れる。図７では局舎８ａ、局舎８ｂへそれぞれ同じ波長
ａ、ｂの２つの信号光が送られている。この場合、局舎
８ａでは波長ａの信号光のみを使用し、局舎８ｂでは波
長ｂの信号光を使用する方式が考えられる。最初に分岐
信号光を送る局舎の数だけの信号光を分岐させておき、
更に分岐信号光を追加し、この追加した信号光を通信容
量を増やしたい局舎が利用する方式が可能である。送信
局である局舎６に一番近い光分岐挿入回路１ａから順に
該回路に配置する低域透過フィルタ３の特性を変化さ
せ、短い波長から順に１つの信号光を局舎毎に分岐させ
ていく構成も考えられる。このような場合は信号光の波
長間隔を０．８ｎｍより大きくしておくことが望まし
い。また分岐信号光を受信する局舎のうち送信局から離
れたものには低域透過フィルタにかえて所定の波長域の
信号光を透過させる帯域透過フィルタを配置することも
できる。FIG. 7 shows a case where the signal light to the stations 8a and 8b is further increased by one wavelength in the configuration of FIG. At the station 6, a signal light having a shorter wavelength a than the signal light having the shortest wavelength b is added and transmitted.
The signal light having the wavelength a and the signal light having the wavelength b are transmitted through the low-pass filter and sent to the stations 8a and 8b. From the offices 8a and 8b, signal lights of wavelengths a and b are transmitted to the optical add / drop circuit. Therefore, the signal light of the wavelengths a, b, d, e, and f transmitted from the station 6 is sent to the station 7. In FIG. 7, two signal lights of the same wavelengths a and b are transmitted to the stations 8a and 8b, respectively. In this case, it is conceivable that the station 8a uses only the signal light of the wavelength a and the station 8b uses the signal light of the wavelength b. First, the signal light is split into as many as the number of stations that send the split signal light,
Further, a method is possible in which a branch signal light is added, and the added signal light is used by a station that wants to increase the communication capacity. The characteristics of the low-pass filter 3 arranged in the optical add / drop circuit 1a closest to the station 6 which is the transmitting station are changed in order, and one signal light is split in each station sequentially from the shortest wavelength. Many configurations are possible. In such a case, it is desirable to make the wavelength interval of the signal light larger than 0.8 nm. Further, among the stations that receive the branched signal light, those that are distant from the transmitting station may be provided with band-pass filters that transmit signal light in a predetermined wavelength range instead of low-pass filters.
【００１６】図８は本発明の光分岐挿入回路の他の構成
を示している。この構成は図１の構成に対し低域透過フ
ィルタ３と高域透過フィルタ２の設置される位置が逆に
なっている。したがって、局舎８ａへの分岐路の通信容
量を増やす場合は、すでに使用されている信号光の波長
より長波長の光信号を局舎６にて波長多重して送出す
る。一方、局舎６から局舎７への主伝送路の通信容量を
増やす場合は短波長側の光信号を加える。FIG. 8 shows another configuration of the optical add / drop circuit of the present invention. In this configuration, the positions at which the low-pass transmission filter 3 and the high-pass transmission filter 2 are installed are reversed with respect to the configuration of FIG. Accordingly, when increasing the communication capacity of the branch path to the station 8a, the station 6 wavelength-multiplexes and transmits an optical signal having a longer wavelength than the wavelength of the signal light already used. On the other hand, when increasing the communication capacity of the main transmission path from the station 6 to the station 7, an optical signal on the short wavelength side is added.
【００１７】以上のような本発明の光分岐挿入回路で
は、使用する光分岐挿入回路内の構成に応じて、低域透
過フィルタ又は高域透過フィルタのみを透過する信号光
を追加するだけで、光伝送システム設置後であっても、
光分岐挿入回路を交換することなく主伝送路または分岐
路の通信容量（信号光の数）を増加させることができる
という優れた効果を奏する。In the optical add / drop circuit of the present invention as described above, depending on the configuration of the optical add / drop circuit used, only the signal light that passes through only the low-pass filter or the high-pass filter is added. Even after installing the optical transmission system,
There is an excellent effect that the communication capacity (the number of signal lights) of the main transmission path or the branch path can be increased without replacing the optical add / drop circuit.
【００１８】本発明の光分岐挿入回路で用いられる光信
号の波長は、複数の波長のうちほぼ中間の波長を１．５
５８５μとしこの波長を中心に０．８ｎ毎の波長差を有
する複数の波長を用いることができる。上記光分岐挿入
回路が配置される光伝送システムにおいて、エルビウム
添加光直接増幅器が用いられる場合、使用する光信号お
よび後から追加する光信号の波長は、該増幅器によって
増幅可能な範囲内のものであることが必要である。また
局舎６から送出される各信号光は、必ず低域透過フィル
タまたは高域透過フィルタのいずれかを透過し、また両
フィルタのいずれをも透過することはない。具体的に
は、上述の実施の形態のように、低域透過フィルタの透
過上限波長と高域透過フィルタの透過下限波長を波長ｃ
（たとえば１．５５８５μ）とし、局舎６から送出され
る各信号光を、この波長ｃを除きこれより短波長および
長波長の信号光により構成することができる。The wavelength of the optical signal used in the optical add / drop circuit of the present invention is set to be approximately 1.5 times the intermediate wavelength among a plurality of wavelengths.
It is possible to use a plurality of wavelengths having a wavelength difference of 585 μm and a wavelength difference of 0.8n around this wavelength. In the optical transmission system in which the optical add / drop circuit is arranged, when an erbium-doped optical direct amplifier is used, the wavelength of the optical signal to be used and the wavelength of the optical signal to be added later are within a range that can be amplified by the amplifier. It is necessary to be. Each signal light transmitted from the station 6 always passes through either the low-pass filter or the high-pass filter, and does not pass through both filters. Specifically, as in the above-described embodiment, the transmission upper-limit wavelength of the low-pass filter and the transmission lower-limit wavelength of the high-pass filter are set to the wavelength c.
(For example, 1.5585 μ), each signal light transmitted from the station 6 can be constituted by signal light having a shorter wavelength and a longer wavelength except for the wavelength c.
【００１９】分波器及び合波器は３ｄＢカプラを用いる
ことが望ましい。また低域透過フィルタ及び高域透過フ
ィルタは多層膜構造によって構成できる。It is desirable to use a 3 dB coupler for the demultiplexer and the multiplexer. Further, the low-pass filter and the high-pass filter can be configured by a multilayer structure.
【００２０】[0020]
【発明の効果】以上述べたように、光伝送システムに本
発明の光伝送装置を適用した場合、該システム設置後に
伝送路の容量を増やすとき上記光分岐挿入回路を交換す
る必要がないので、海底中継システムなどにおいて多額
の費用をかけずに光伝送路の通信容量の増加が可能であ
る。As described above, when the optical transmission apparatus of the present invention is applied to an optical transmission system, it is not necessary to replace the optical add / drop circuit when increasing the capacity of the transmission line after the installation of the system. It is possible to increase the communication capacity of an optical transmission line without incurring a large cost in a submarine repeater system or the like.
【図１】本発明の光分岐挿入装置を用いた光伝送システ
ム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 transmission system using an optical add / drop multiplexer of the present invention.
【図２】図１の光分岐挿入装置を用いた光伝送方法を示
すブロック図。FIG. 2 is a block diagram showing an optical transmission method using the optical add / drop multiplexer of FIG.
【図３】本発明の光分岐挿入装置に用いる高域透過フィ
ルタと低域透過フィルタの特性を示す図。FIG. 3 is a diagram showing characteristics of a high-pass filter and a low-pass filter used in the optical add / drop multiplexer of the present invention.
【図４】分岐路の信号光の数を増加させる場合を示すブ
ロック図。FIG. 4 is a block diagram showing a case where the number of signal lights in a branch path is increased.
【図５】主伝送路の信号光の数を増加させる場合を示す
ブロック図。FIG. 5 is a block diagram showing a case where the number of signal lights in a main transmission path is increased.
【図６】２台の光分岐挿入装置を配置した構成例を示す
ブロック図。FIG. 6 is a block diagram showing a configuration example in which two optical add / drop devices are arranged.
【図７】図６の構成における光伝送方法を示すブロック
図。FIG. 7 is a block diagram showing an optical transmission method in the configuration of FIG. 6;
【図８】本発明の光分岐挿入装置の他の構成例を示すブ
ロック図。FIG. 8 is a block diagram showing another configuration example of the optical add / drop multiplexer of the present invention.
【図９】従来の光分岐挿入装置を用いた光伝送システム
の構成例を示すブロック図。FIG. 9 is a block diagram showing a configuration example of an optical transmission system using a conventional optical add / drop device.
１ａ、１ｂ、１ｃ 光分岐挿入回路 ２ 高域透過フィルタ ３ 低域透過フィルタ ４ 分波器 ５ 合波器 ６、７、８ａ、８ａ 局舎 1a, 1b, 1c Optical add / drop circuit 2 High-pass transmission filter 3 Low-pass transmission filter 4 Demultiplexer 5 Combiner 6, 7, 8a, 8a
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) H04B 10/00 H04J 14/00 ──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. 7 , DB name) H04B 10/00 H04J 14/00
Claims (7)
波長多重信号光を主伝送路に送信する送信局と、 前記第１の局舎と前記主伝送路により接続されており、
前記波長多重信号光から所定の信号光を選択的に分岐し
て分岐信号光を取出すと共に、残余の信号光を通過信号
光として前記主伝送路に送出する光分岐手段を含む光分
岐挿入装置と、 前記主伝送路から出力される前記通過信号光を受信する
受信局とを備えた光伝送装置であって、 前記分岐信号光は所定の第１の波長帯域内にあり、前記
通過信号光は所定の第２の波長帯域内にあり、 前記第１の送信局は、 前記光分岐挿入装置において分岐される信号光を増やす
場合には、前記第１の波長帯域内にあって前記分岐信号
光とは異なる波長を有する信号光を追加して送信し、 前記光分岐挿入装置をそのまま通過させる信号光を増や
す場合には、前記第２の波長帯域内にあって前記通過信
号光とは異なる波長を有する信号光を追加して送信する
追加信号光送出手段を備えている ことを特徴とする光伝
送装置。1. A signal light having a plurality of wavelengths different from each other.
A transmitting station for transmitting the wavelength multiplexed signal light to the main transmission line, the first station being connected to the main station by the main transmission line,
A predetermined signal light is selectively branched from the wavelength multiplexed signal light.
To extract the branched signal light and pass the remaining signal light through the signal
A light component including an optical branching means for transmitting the light to the main transmission path.
A branch insertion device for receiving the passing signal light output from the main transmission path
An optical transmission device comprising a receiving station, wherein the branch signal light is within a predetermined first wavelength band,
The passing signal light is within a predetermined second wavelength band, and the first transmitting station increases the signal light dropped in the optical add / drop multiplexer.
In the case, the branch signal within the first wavelength band
The signal light having a wavelength different from that of the light is additionally transmitted, and the signal light that passes through the optical add / drop multiplexer is increased.
In this case, the pass signal within the second wavelength band
Add and transmit signal light having a different wavelength from the signal light
An optical transmission device comprising additional signal light transmitting means .
信号光と同じ波長の信号光を前記通過信号光に合波する
光挿入手段を備えていることを特徴とする光伝送装置。2. The optical add / drop multiplexer further comprises:
A signal light having the same wavelength as the signal light is multiplexed with the passing signal light.
An optical transmission device comprising an optical insertion unit .
内にある波長の光を反射をさせ、前記第２の波長帯域内
にある波長の光を透過させる波長固定フィルタを含んで
いることを特徴とする請求項１又は請求項２記載の光伝
送装置。3. The optical branching means according to claim 1 , wherein:
To reflect light having a wavelength within the second wavelength band.
Including a fixed wavelength filter that transmits light of a certain wavelength
The optical transmission device according to claim 1 or 2, wherein
を分岐して第１の分岐信号光と第２の分岐信号光をそれ
ぞれ出力する光分岐器と、 前記第１の分岐信号光から前記第１の波長帯域内にある
波長の光を選択的に透過させて前記分岐信号光を出力す
る第１の波長固定フィルタと、 前記第２の分岐信号光から前記第２の波長帯域内にある
波長の光を選択的に透 過させて前記通過信号光を出力す
る第２の波長固定フィルタとを含んでいることを特徴と
する請求項１又は請求項２記載 の光伝送装置。 4. The wavelength division multiplexing signal light according to claim 1 , wherein
And splits the first split signal light and the second split signal light into
Optical splitters for outputting the respective signals, and the optical splitters are within the first wavelength band from the first split signal light.
And selectively transmitting light having a wavelength to output the branched signal light.
A first wavelength-locked filter, and a second wavelength band within the second wavelength band from the second branch signal light.
Outputs the passing signal light by selectively permeable bulk light of wavelength
And a second fixed wavelength filter.
The optical transmission device according to claim 1 or 2, wherein
帯域よりも短波長側に存し、前記波長固定フィルタは、
低域透過フィルタであることを特徴とする請求項３記載
の光伝送装置。 5. The method according to claim 1, wherein the first wavelength band is the second wavelength.
Exists on the shorter wavelength side than the band, the wavelength fixed filter,
The optical transmission device according to claim 3 , wherein the optical transmission device is a low-pass filter .
帯域よりも長波長側に存し、 前記波長固定フィルタは、高域透過フィルタであること
を特徴とする請求項３記載 の光伝送装置。 6. The apparatus according to claim 1, wherein the first wavelength band is the second wavelength.
Exist on the longer wavelength side than the band, and the wavelength fixed filter is a high-pass filter.
The optical transmission device according to claim 3, wherein:
波長多重信号光を主伝送路に送信する送信局と、 前記送信局舎と前記主伝送路により接続されており、前
記波長多重信号光から所定の信号光を選択的に分岐して
分岐信号光を取出すと共に、残余の信号光を通過信号光
として前記主伝送路に送出する光分岐手段を含む光分岐
挿入装置と、 前記主伝送路から出力される前記通過信号光を受信する
受信局とを備えた光伝送装置における光伝送方法であっ
て、 前記分岐信号光は所定の第１の波長帯域内にあり、前記
通過信号光は所定の第２の波長帯域内にあり、 前記光分岐手段は、前記第１の波長帯域内にある波長の
光を反射をさせ、前記第２の波長帯域内にある波長の光
を透過させる波長固定フィルタを含んでおり、前記光分
岐挿入装置において分岐される信号光を増やす場合に
は、前記送信局から前記第１の波長帯域内にあって前記
分岐信号光とは異なる波長を有する信号光を追加して送
信し、 前記光分岐挿入装置をそのまま通過させる信号光を増や
す場合には、前記送信局から前記第２の波長帯域内にあ
って前記通過信号光とは異なる波長を有する信号光を追
加して送信する ことを特徴とする光伝送方法。7. Including signal light of a plurality of wavelengths different from each other.
A transmitting station for transmitting the wavelength multiplexed signal light to the main transmission line, the transmission station building being connected to the main transmission line,
A predetermined signal light is selectively branched from the WDM signal light.
Extracts the split signal light and passes the remaining signal light through the signal light
Optical branching including optical branching means for sending out to the main transmission line as
An insertion device for receiving the passing signal light output from the main transmission path
An optical transmission method in an optical transmission device having a receiving station.
The branch signal light is within a predetermined first wavelength band,
The passing signal light is within a predetermined second wavelength band, and the optical branching unit is configured to output a signal having a wavelength within the first wavelength band.
Reflect light, and emit light having a wavelength within the second wavelength band.
A wavelength fixing filter for transmitting light,
When increasing the signal light to be branched in the branch insertion device
Is within the first wavelength band from the transmitting station and
Signal light having a wavelength different from that of the branched signal light is added and transmitted.
And Shin, Ya increase as a signal to pass light through the optical add drop apparatus
In the second wavelength band from the transmitting station.
Signal light having a wavelength different from that of the passing signal light.
Optical transmission method characterized by pressing and send.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9076753A JP3039430B2 (en) | 1997-03-28 | 1997-03-28 | Optical add / drop circuit and optical transmission method |
| FR9803821A FR2761484A1 (en) | 1997-03-28 | 1998-03-27 | Add-drop optical multiplexer unit for long distance communication |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9076753A JP3039430B2 (en) | 1997-03-28 | 1997-03-28 | Optical add / drop circuit and optical transmission method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10276129A JPH10276129A (en) | 1998-10-13 |
| JP3039430B2 true JP3039430B2 (en) | 2000-05-08 |
Family
ID=13614359
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9076753A Expired - Lifetime JP3039430B2 (en) | 1997-03-28 | 1997-03-28 | Optical add / drop circuit and optical transmission method |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP3039430B2 (en) |
| FR (1) | FR2761484A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPWO2013128556A1 (en) * | 2012-02-27 | 2015-07-30 | 富士通株式会社 | Optical signal branching apparatus and optical transmission system |
| WO2016047092A1 (en) * | 2014-09-25 | 2016-03-31 | 日本電気株式会社 | Cable coupling, wavelength-multiplexed optical communication system, and wavelength-multiplexed-optical-signal branching method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2734437B1 (en) * | 1995-05-17 | 1997-06-13 | Sutter Alain | WAVELENGTH MULTIPLEXED INFORMATION TRANSMISSION RING NETWORK |
-
1997
- 1997-03-28 JP JP9076753A patent/JP3039430B2/en not_active Expired - Lifetime
-
1998
- 1998-03-27 FR FR9803821A patent/FR2761484A1/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| JPH10276129A (en) | 1998-10-13 |
| FR2761484A1 (en) | 1998-10-02 |
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