JPS595205A - Demultiplexer for single mode bidirectional wavelength multiplex transmission - Google Patents
Demultiplexer for single mode bidirectional wavelength multiplex transmissionInfo
- Publication number
- JPS595205A JPS595205A JP11249482A JP11249482A JPS595205A JP S595205 A JPS595205 A JP S595205A JP 11249482 A JP11249482 A JP 11249482A JP 11249482 A JP11249482 A JP 11249482A JP S595205 A JPS595205 A JP S595205A
- Authority
- JP
- Japan
- Prior art keywords
- waveguide
- wavelength
- transmission
- light
- demultiplexer
- 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.)
- Pending
Links
Classifications
-
- 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
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4246—Bidirectionally operating package structures
-
- 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
- G02B6/29331—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 evanescent wave coupling
- G02B6/29332—Wavelength selective couplers, i.e. based on evanescent coupling between light guides, e.g. fused fibre couplers with transverse coupling between fibres having different propagation constant wavelength dependency
-
- 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
Abstract
Description
【発明の詳細な説明】
（技術外！１１ｆ）
本発明は、窪−モート双方向２波長多重）ｔファイバ伝
送系の送受信端で使われる分波器に、ｔｏいて、送ｆ菖
側から受信（１１１１への分離度を増大させ、後方帰躍
光の影響を小さくするだめの構成に関するものである。Detailed Description of the Invention (Non-technical! 11f) The present invention is a duplexer used at the transmitting and receiving end of a Kubo-Mote bidirectional two-wavelength multiplexing (T-fiber transmission system). (This is related to a configuration that increases the degree of separation to 1111 and reduces the influence of backward returning light.
（背景技術）
図１には中−モード方向性結合器の１１１＋’ｆ造を示
−」−１，２本の単一モード導波路が、その間に結合が
生しるよう隣接１−で並列配置さ」している。いま、２
つの導波路１，２が有する位相定数をβ１．β２、伝搬
−１−る光パワーをＰＩ ｒ Ｐ２、軸方向距肉１ｆを
Ｚでそれぞコ１゜表わし、励振部（Ｚ＝０）において導
波路１ｖこＬ’ｉ＋、なる光パワーが励振された場合を
想定すると、導波路が無損失であるならばＰＩ ＋ ”
２は次のように表わすことができる。(Background Art) Figure 1 shows a 111+'f structure of a medium-mode directional coupler. Two single-mode waveguides are arranged adjacently in parallel so that coupling occurs between them. It has been arranged. Now, 2
The phase constants of the two waveguides 1 and 2 are β1. β2, the optical power of propagation -1- is represented by PI r P2, and the axial distance 1f is represented by Z, respectively. In the excitation part (Z = 0), the optical power of the waveguide 1v is L'i+, which is excited. If the waveguide is lossless, then PI + ”
2 can be expressed as follows.
（ＩＦ＋／ｐ、 ） ＝ １−（’２／ｌ）、 ） −
２８ｉｎ・Ｃ１，＋１）Ｉｎ Ｉｌｌ
（＋２β・−β・ ・／２ （２゜
Ｃ−〔１（２＋（２）２〕
ここで１くは結合定数であり、これの値は導波路の構造
パラメータや波長によって決まる。、いまβ、−β２の
場合を考えると、（シー１＼であイ）から、１（の波長
依イア何二に応じて（１，’、／Ｉゝ、。）、 （１’
２／ ｌ’ｉ、、 ）は図２のようなふるまいを示す。(IF+/p, ) = 1-('2/l), ) −
28in・C1,+1)In Ill
(+2β・−β・ ・/2 (2゜C−[1(2+(2)2]) Here, 1 is the coupling constant, and its value is determined by the structural parameters and wavelength of the waveguide. Now β Considering the case of , -β2, from (see1\deai), depending on the wavelength of 1(, (1,', /Iゝ,.), (1'
2/l'i,,) exhibits the behavior shown in Figure 2.
ここで例えば２−）のＬ１νＪ（λ７．λ２に着１１−
１−ることとすイ）。まず波長λ１てＧ、１−１ｌｉｉ
、−モート方向性結合器の（・ずねが一方の導波路（図
１では導波路１）に入射しまた光は、他力の・、１′？
岐路（図■て゛は導波路２）から出射する、二と（、・
こなＺ＋、、−力波ＪそＡ２ては、入射したのと同じＪ
、１．’４ ＩＪν１１５３（図１では導メル路１）か
ら光は出射することＧこなイ）１、従−）て逆ｅこ、入
射側で波長λ１．λ２の光か６．１−なる導波路を伝わ
るようにずろと、出射側では両者が回−の導波路を伝わ
るようにすることが］ｌ］１止であり、この−中−モー
ド方向性結合器を光分岐ｘ：；としこ利用することがで
きろ。現実にはβ１＼β２であるため（１’＋／ ”ｉ
ｎ ） 、（１’２／ Ｐｒｎ ）の波長依存ケト１１
寸ノ］；３に示すようなものとなる、。Here, for example, 2-) L1νJ(λ7.11-
1-Kotto and A). First, the wavelength λ1 is G, 1-1lii
, - The beam of the mote directional coupler is incident on one waveguide (waveguide 1 in Fig. 1), and the light is reflected by the external force ., 1'?
Two and (...
This is Z+,,-force wave J SoA2 is the same J that was incident.
, 1. '4 The light is emitted from IJν1153 (guiding path 1 in FIG. 1), and the wavelength λ1. The light of λ2 is shifted so that it travels through the waveguide of 6.1-, and the light of λ2 is transmitted through the waveguide of 6.1- on the output side. The coupler can be used as an optical branch x:; In reality, β1\β2 (1'+/ ”i
n), (1'2/Prn) wavelength-dependent keto11
It will look like the one shown in 3.
図４には、単一モート方向性結合器を双方向２？Ｊυに
、多重伝送（（適月１（〜だ場合υ′こおり゛る］つの
送受１．１装置側の＋）１７１成図を示す。図・Ｉにお
いて、３ば一中−士−１・力向性結合漸、４は伝送用元
ファイバであり、λ５ｌＪ−送・１旨伯弓彼長、λ■（
は受信（８号波長を表わし７ている。理想的には、送イ
５化列は光ファイバ１［ＩＬ端にル〕るもうＯ・とつの
送受信装置に向って一方 ′向に伝搬ずべきである。し
かしｕｌ、実には、（ｚｅ送川出光ァイバの途中に存在
する接続点かじ）のフレネル反射や光フアイバ中で発生
ずるレイ’） −’ ｆｆ（州りによって、波長λＳの
送信信号の一７Ｘ１１は出城もとの送受信装置へ戻って
来ることになる。波長λＳ □） 愛ｆｉ’！信−号を
良好な条件で受信するためには、波長’ｎＯ）光を通過
させ、波ＪそλＳの）′ｒ；を鋭く遮断する中−七−ド
方向性結合器が必要とされる３、
以上のように、単一モード方向性結合器は（）ν長依存
性を冶し、そのため２彼長の分δν器として利用可能で
あること、また、伝送用光ファイバが１゛）の戻り光を
考慮すると、送信信＠波Ｊその光を説（遮断する特性が
９求さＪｌイ）ことか従来知らね、−（いた。しかしな
がら、乍−モード方向件結合番のψＩ′＾１子と、伝送
用光ファイバ、発光素子（λｓ）、受）し素子（λ＋１
）とを接続して、最も効果的に送（、−ｉ ｆ部；波長
の光を遮断する方法Ｇ」−こＡ１まて７Ｊ＜さ、ｌ＋て
いなかった。Figure 4 shows a single mote directional coupler with bidirectional 2? Jυ shows the multiplex transmission ((appropriate month 1 (if υ′ cold) + on the device side) 171 diagram. 4 is the source fiber for transmission;
represents the receiving (wavelength 8).Ideally, the transmitting 5-column should propagate in one direction towards the other 0 and 2 transceivers connected to the optical fiber 1 [at the IL end]. However, ul is actually due to the Fresnel reflection of (the connection point existing in the middle of the optical fiber) and the ray generated in the optical fiber. 17X11 will return to the original transmitter/receiver.Wavelength λS □) Ai fi'! In order to receive the signal under good conditions, a medium-to-seven-band directional coupler is required that passes the wavelength 'nO) and sharply blocks the wave J and λS)'r;. 3. As mentioned above, the single mode directional coupler has a ()v length dependence, and therefore can be used as a δν device for the length of 2. Also, the transmission optical fiber is 1゛) Considering the return light of the transmitted signal @wave 1 element, transmission optical fiber, light emitting element (λs), receiving element (λ+1
) to most effectively transmit (, -if part; method of blocking light of wavelength G'-this A1 was not 7J<S, l+.
（発明の課；似）
本発明は、単一モード方向イ４１に１１．合冊を双ノＪ
回２？ｌ’ｊ 、Ｉ、ン多爪伝送ＪＴＩ分波系に利用す
る場合の接続構成を１．′ｆ供ずく）ことを！１）徴と
し、その目的は送信信号波長の光を最も効果的に遮断す
ることにある。(Section of the Invention; Similar) The present invention provides the following advantages: 11. Combined volumes with Futano J
Time 2? The connection configuration when used in a multi-claw transmission JTI demultiplexing system is 1. 'f offerings)! 1) The purpose is to most effectively block light at the transmission signal wavelength.
（発明の（’ｆ７ｒ成および作用）
図５は本発明の実施例であって、３は屯−モート方向性
結合器、４，５は単一モート方向性結合器をＪ、Ｎ、成
する導波路、６は伝送用）”Ｃ，ファイバ、７は一中−
モート方向＋′１．結合器３と伝送用光ファイバ６の接
１’）ｌ：点、８は発光素子、９は受光素子である。('f7r configuration and operation of the invention) FIG. 5 shows an embodiment of the present invention, in which 3 is a tun-moat directional coupler, 4 and 5 are single-moat directional couplers J, N, Waveguide, 6 is for transmission) "C, fiber, 7 is one-
Mote direction +'1. The junction 1')l of the coupler 3 and the transmission optical fiber 6 is a point, 8 is a light emitting element, and 9 is a light receiving element.
ここてλＳ、λＩ（はそ」１ぞれ送信信号波長、受信信
号波長を４１１シている。伝送出光ファイバ６は接続点
７によ−）で箪−モード方向性結合器；３を構成する】
′−）の導ｅｌｌＬ路４と接わ゛にさＪｌており、発光
素子８は１扁１２導波路・１と、受光素子９は他の導波
路９とそＡ１そ」１接ｈ″１；されて℃・る、１図：３
の！１１件曲線かられかるように、−中−・モートノ月
ｉｉげ１−Ｘ４ｒ！：合冊−Ｃは／メ、＼β２なる一般
的な場合におし・でも、７ｉ’、ｌ：、ろｉｊｌ彼路間
でば、分１ｔ１（が冗全にイーｔなわＡする＞ｒυＪ（
が必ず存在−１′る（例えｄ−図；３てはＡ２）。Here, λS and λI (each having a transmitting signal wavelength and a receiving signal wavelength of 411, respectively. The transmission output optical fiber 6 is connected to the connection point 7) form a short-mode directional coupler; 3. ]
The light emitting element 8 is connected to the 12 waveguide 1, and the light receiving element 9 is connected to the other waveguide 9. ; Been ℃・ru, 1 figure: 3
of! 11 curves to be read, - middle - Moto no Tsuki iige 1-X4r! : Combined volumes - C is /me, \β2 in the general case, but if 7i', l:, roijl, then min 1t1( is redundantly etnawa A > rυJ(
always exists -1' (for example, d-figure; 3 is A2).
＋＋し−１，）−こ、ｆバ送用光ファイバからの戻り光
を効果的に抑えるためには、図５に示１よう（こ（ｚｅ
送月ししファイバ６と受光素子９）とを互いに異なる）
”ｔ；、’％１４ｔｌυ路１１．５に接続し、発光素子
からの送イ１１イハ村ｃノ長長、１８４・図３で宮えば
Ａ２に一致させね、ば良Ｌ・。このどぎ、発光素子８は
、伝送用光ファイバと回じ側の導波路４に接続すること
になる。In order to effectively suppress the return light from the optical fiber for transmitting
The transmitting fiber 6 and the light receiving element 9) are different from each other.
``t;,'%14tlυ Connect to path 11.5, send from the light emitting element 11 Iha village c length, 184・If it is arranged in Figure 3, match it to A2. , the light emitting element 8 is connected to the transmission optical fiber and the waveguide 4 on the rotation side.
従って図５のようなｌ−１４成で単一モード双ノＪ向２
波長多重分波系を実現することにより、その角、１冒（
↓として、送信光信号のへ戻り光から受）′ｒ、素子を
効果的に分離することができ、良好なｆム送系を実現で
きることＫなる。Therefore, in the l-14 configuration as shown in Fig. 5, single mode twin J direction 2
By realizing a wavelength multiplexing/demultiplexing system, the angle 1
As ↓, it is possible to effectively separate the receiving element from the returning light of the transmitted optical signal, and it is possible to realize a good fm transmission system.
図６は、図５の分岐系を光ファイバの両側に設けたもの
で、実際の伝送系はこのように（１９１成さ、ｌ＋るこ
とになる。In FIG. 6, the branching system shown in FIG. 5 is provided on both sides of an optical fiber, and the actual transmission system will be (191, l+) like this.
（発明の効果）
以上潴、明したように、本発明のような単一モード双方
向２波斥多重伝送用分波系を１１１７１成することによ
り、送信光信号の戻り光の５ヤ）愛）“色素子に結合す
る成分を抑ＪＥすることかてきるため、受（１，ｉｌ、
１号のＳ／Ｎ比向」−が達成されることになり、（Ｊｋ
送距ガ１の増大にも有効となるという利点がある。(Effects of the Invention) As explained above, by constructing the single-mode bidirectional two-wave repulsion multiplexing transmission demultiplexing system 11171 as in the present invention, the return light of the transmitted optical signal can be ) “Because it is possible to suppress the components that bind to the pigment,
The S/N ratio of No. 1 is achieved, and (Jk
This has the advantage that it is also effective in increasing the distance traveled.
図１は中−モード方向性結合器の構造図、図２と図；３
は弔−モード方向性結合器の波長特性を示す図、図４（
１双方向２彼長多重伝送系における光４６号の伝搬状態
を示す図、図５と図６は本発明の′Ｊを施例てあ４）。
１．２・・・・・光導波路
：３・・・・・・・・ｔ）１−モード方向性結合器４．
５・・・・・光導波路
（５・・・・・・・・・伝送用光ファイバ７ ・・・・
・・・接続点
８・・・・・・発光素子
９・・・・・・・・受光素子
特６干出願人
日本電信電話公社
特ｄ′１：出１幀代理人
弁理士 山 本 恵 −
承２図
入１ ＼２
、成長
襄３閏
：【支
阜ｉ 図
人尺 人尺
泉３ 図Figure 1 is a structural diagram of a medium-mode directional coupler, Figures 2 and 3;
is a diagram showing the wavelength characteristics of the mourning mode directional coupler, Figure 4 (
Figures 5 and 6 are diagrams showing the propagation state of optical signal 46 in a two-way, two-way length multiplex transmission system. 1.2... Optical waveguide: 3... t) 1-mode directional coupler 4.
5... Optical waveguide (5...... Transmission optical fiber 7...
... Connection point 8 ... Light-emitting element 9 ... Light-receiving device Patent No. 6 Applicant: Nippon Telegraph and Telephone Public Corporation Special d'1: Out No. 1 Patent attorney: Megumi Yamamoto - 2 illustrations included 1 ＼2 , Growth period 3 leap: [Shifu i figure Jinshaku Jinshaku Izumi 3 figure
Claims (1)
−モード方向性結合器を用いた双方向波長多重光ファイ
バ伝送系の送受信端の分波器において、該分波器の第１
の導波路の一端を送信用発光素−ｒと結合するとともに
他端を伝送用光ファイバに結合し、＆′λ２の導波路の
一端を受信用受光素ｒと結合さぜることにより、送信用
発光素子からの光の５ｔ、、その後方帰還成分が受信用
受光素イに入射することを抑圧したことを特徴とする、
単一モード双方向波長多年、伝送用分波器。In a demultiplexer at the transmitting and receiving end of a bidirectional wavelength multiplexing optical fiber transmission system using a mode directional coupler using two coupling waveguides arranged close to each other in parallel, the first
By coupling one end of the waveguide with the transmitting light emitting element -r and the other end with the transmitting optical fiber, and coupling one end of the waveguide of &'λ2 with the receiving light receiving element r, the transmitting It is characterized by suppressing the backward feedback component of the light from the trusted light emitting element from entering the receiving light receiving element.
Single mode bidirectional wavelength multi-wavelength, transmission demultiplexer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11249482A JPS595205A (en) | 1982-07-01 | 1982-07-01 | Demultiplexer for single mode bidirectional wavelength multiplex transmission |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11249482A JPS595205A (en) | 1982-07-01 | 1982-07-01 | Demultiplexer for single mode bidirectional wavelength multiplex transmission |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS595205A true JPS595205A (en) | 1984-01-12 |
Family
ID=14588046
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11249482A Pending JPS595205A (en) | 1982-07-01 | 1982-07-01 | Demultiplexer for single mode bidirectional wavelength multiplex transmission |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS595205A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05257030A (en) * | 1990-07-31 | 1993-10-08 | Canada | Wdm type optical fiber fusion-spliced coupler |
-
1982
- 1982-07-01 JP JP11249482A patent/JPS595205A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05257030A (en) * | 1990-07-31 | 1993-10-08 | Canada | Wdm type optical fiber fusion-spliced coupler |
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