JPS63287125A - Wavelength multiplex bidirectional transmission method - Google Patents
Wavelength multiplex bidirectional transmission methodInfo
- Publication number
- JPS63287125A JPS63287125A JP62121221A JP12122187A JPS63287125A JP S63287125 A JPS63287125 A JP S63287125A JP 62121221 A JP62121221 A JP 62121221A JP 12122187 A JP12122187 A JP 12122187A JP S63287125 A JPS63287125 A JP S63287125A
- Authority
- JP
- Japan
- Prior art keywords
- wavelength
- optical
- light
- directional coupler
- wavelengths
- 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
- 230000005540 biological transmission Effects 0.000 title claims abstract description 23
- 230000002457 bidirectional effect Effects 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 title claims description 20
- 230000003287 optical effect Effects 0.000 claims abstract description 84
- 239000013307 optical fiber Substances 0.000 claims abstract description 30
- 239000004065 semiconductor Substances 0.000 claims abstract description 8
- 230000008878 coupling Effects 0.000 claims description 5
- 238000010168 coupling process Methods 0.000 claims description 5
- 238000005859 coupling reaction Methods 0.000 claims description 5
- 230000000644 propagated effect Effects 0.000 abstract description 9
- 238000002955 isolation Methods 0.000 abstract description 8
- 238000010586 diagram Methods 0.000 description 5
- 238000004891 communication Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Landscapes
- Optical Communication System (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野〕
本発明は、光合分波器を用いた波長多重双方向伝送方法
に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a wavelength multiplexing bidirectional transmission method using an optical multiplexer/demultiplexer.
光ファイバ通信における光波長多重双方向伝送技術は通
信システムの経済化、高機能化などをはかる上で重要で
ある。Optical wavelength multiplexing bidirectional transmission technology in optical fiber communications is important for making communication systems more economical and highly functional.
従来、双方向伝送方法として、第６図に示すように、２
本の光ファイバを用い、光ファイバの両端に光送信部と
光受信部を接続して情報伝送を行なう方法が用いられて
いた。また、１５−１（あるいは１５−２）の光送信部
側から複数波長の光信号を光合波器により合波して光波
長多重伝送し、１６−１ （あるいは１６−２）の光受
信部側で光分波器によりそれぞれの波長の光信号を分波
する構想も考えられている。Conventionally, as a two-way transmission method, as shown in FIG.
A method has been used in which an optical fiber is used and an optical transmitter and an optical receiver are connected to both ends of the optical fiber to transmit information. In addition, optical signals of multiple wavelengths are multiplexed from the optical transmitter side of 15-1 (or 15-2) by an optical multiplexer and optically wavelength-multiplexed transmitted, and the optical signals of multiple wavelengths are transmitted from the optical transmitter side of 16-1 (or 16-2) Another idea is to use an optical demultiplexer to separate the optical signals of each wavelength.
一本の光ファイバを用いた光波長多重双方向伝途方法と
してはたとえば、柳井；光通信ハンドブック、朝食書店
、１９８２年９月発行、ｐｐ、４９０〜４９３に記載さ
れているように、第７図のような構成が用いられている
。これは局Ａおよび局Ｂ側共に光合分波器１７−１．１
７−２を用い、波長λ工、λ２．λδ、およびλ１の４
つの光信、号を双方向波長多重伝送する方法である。As an optical wavelength division multiplexing bidirectional transmission method using a single optical fiber, for example, as described in Yanai; Optical Communication Handbook, Shokusen Shoten, September 1982, pp. 490-493, The configuration shown in the figure is used. This is an optical multiplexer/demultiplexer 17-1.1 on both station A and station B sides.
7-2, wavelength λ, λ2. λδ, and 4 of λ1
This is a method of bidirectional wavelength multiplexing transmission of two optical signals.
第７図の光波長多重双方向伝送方法は一本の光ファイバ
を用いているので経済的である。しかし、この方法では
波長多重数を多くするには、各波長間の干渉の極めて少
ない、すなわち、高アイソレーシヨン特性をもった光合
分波器が必要となり、これを実現することは極めてむず
かしい、したがって、数波長程度が限度である。ただし
、数波長程度でも光合分波器は非常に高価になる。これ
に対して、第６図のように２本の光ファイバを用いわば
、それぞれの光ファイバに同一波長の光信号を伝送させ
ることができるので、半導体光素子を同一のものを使え
、経済的となる。しかし、複数波長の光信号を用いよう
とすると、第７図に示すような光合分波器１７−１．１
７−２を局Ａおよび局Ｂにそれぞれ２個ずつ使わなけれ
ばならず、やはり非常に高価となると同時に、高アイソ
レーシヨン特性をもった光合分波器が必要になる。しか
し１．現状ではこのような光合分波器はまだ見い出され
ていない。The optical wavelength division multiplexing bidirectional transmission method shown in FIG. 7 is economical because it uses one optical fiber. However, in order to increase the number of wavelengths multiplexed with this method, an optical multiplexer/demultiplexer with extremely low interference between each wavelength, that is, with high isolation characteristics, is required, which is extremely difficult to achieve. Therefore, the limit is about several wavelengths. However, an optical multiplexer/demultiplexer is extremely expensive even for just a few wavelengths. On the other hand, if two optical fibers are used as shown in Figure 6, it is possible to transmit optical signals of the same wavelength through each optical fiber, so the same semiconductor optical device can be used, which is economical. becomes. However, when trying to use optical signals of multiple wavelengths, an optical multiplexer/demultiplexer 17-1.1 as shown in FIG.
7-2 must be used for each station A and B, which is still very expensive and requires an optical multiplexer/demultiplexer with high isolation characteristics. But 1. At present, such an optical multiplexer/demultiplexer has not yet been found.
本発明の目的は、２本の光ファイバを用いた光波長多重
双方向伝送方法において、光合分波装置を簡易化して低
コストに実現することと、それぞれの波長の干渉が極め
て少ない高アイソレーシヨン特性を実現させる構成法を
提供することにある。The purpose of the present invention is to simplify an optical multiplexing/demultiplexing device at low cost in an optical wavelength division multiplexing bidirectional transmission method using two optical fibers, and to provide a high isolator with extremely low interference between each wavelength. The object of the present invention is to provide a construction method that realizes the sion characteristics.
上記目的は、新構成の光合分波装置を局Ａおよび局Ｂ側
にそれぞれ１個用いることにより達成される。この光合
分波装置は同一の構造の方向性結合器３個と、半導体光
素子とからなる６〔作用〕
光ファイバ６−１内を伝搬してきた波長λｌ。The above object is achieved by using one newly configured optical multiplexing/demultiplexing device on each of the station A and station B sides. This optical multiplexing/demultiplexing device consists of three directional couplers of the same structure and a semiconductor optical element. 6 [Operation] The wavelength λl propagated in the optical fiber 6-1.
λ８（λ１とλ８の波長間隔は十分に離れている。）の
光信号は方向性結合器１８−１の入力導波路１９−１に
入射する。そして、方向性結合器１８−１により光信号
が分波され、波長λ１は方向性結合器１８−２の入力導
波路に入射される。波長λ♂は方向性結合器１８−３の
入力導波路に入射される。方向性結合器１８−２に入射
した波長λ１の光信号は方向性結合器１８−２で分波さ
れて受光素子２に入力される。波長λ８の光信号は方向
性結合器１８−３で分波されて受光素子４に入力される
。ここで、１８−２に漏洩した非希望光λ８は１８−２
で分波されて出力導波路１９−５に分波されるため、受
光素子２には波長λ８の非希望光は受信されない。また
１８−３に漏洩した非希望光λ１は出力導波路１９−７
に分波されるので、受光素子４には波長λ１の光信号の
みが受信され、波長λ１と１８間のチャネル間干渉を大
幅に抑圧できる。同様に発光素子１の光信号λ４ （λ
４はλ８に近接した波長）と発光素子３の光信号λ２
（λ２はλｌに近接した波長）も受光素子２および４に
漏洩することなく、光ファイバ６−２内を矢印７−２方
向に伝搬していく。The optical signal of λ8 (the wavelength interval between λ1 and λ8 is sufficiently far apart) is incident on the input waveguide 19-1 of the directional coupler 18-1. The optical signal is then demultiplexed by the directional coupler 18-1, and the wavelength λ1 is input to the input waveguide of the directional coupler 18-2. The wavelength λ♂ is input to the input waveguide of the directional coupler 18-3. The optical signal of wavelength λ1 incident on the directional coupler 18-2 is demultiplexed by the directional coupler 18-2 and input to the light receiving element 2. The optical signal of wavelength λ8 is demultiplexed by the directional coupler 18-3 and input to the light receiving element 4. Here, the undesired light λ8 leaked to 18-2 is 18-2
Since the undesired light having the wavelength λ8 is not received by the light receiving element 2, it is demultiplexed by the output waveguide 19-5. In addition, the undesired light λ1 leaked to the output waveguide 19-7
Since only the optical signal of wavelength λ1 is received by the light receiving element 4, inter-channel interference between wavelengths λ1 and 18 can be significantly suppressed. Similarly, the optical signal λ4 (λ
4 is a wavelength close to λ8) and the optical signal λ2 of the light emitting element 3
(λ2 is a wavelength close to λl) also propagates in the direction of arrow 7-2 within the optical fiber 6-2 without leaking to the light receiving elements 2 and 4.
（実施例〕
第１図に本発明の波長多重双方向伝送方法の実施例を示
す、これは局Ａまたは局Ｂの構成を示したものである。(Embodiment) FIG. 1 shows an embodiment of the wavelength division multiplexing bidirectional transmission method of the present invention, which shows the configuration of station A or station B.
８は導波路型構造の光合分波モジュールであり、埋込み
型、リッジ型、装荷型などの導波路構造からなる。５−
１．５−２．５−３は方向性結合器であり、同−構造の
ものである。Reference numeral 8 denotes an optical multiplexing/demultiplexing module having a waveguide type structure, and includes a buried type, ridge type, loaded type, etc. waveguide structure. 5-
1.5-2.5-3 is a directional coupler having the same structure.
そして、第２図に示すような波長特性を有している。な
お、第２図の波長特性の帯域特性は結合部１８−１．１
８−２．１８−３の結合長、結合間隔を調節することに
よって制御することができる。It has wavelength characteristics as shown in FIG. Note that the band characteristics of the wavelength characteristics in FIG.
It can be controlled by adjusting the bond length and bond spacing of 8-2.18-3.
したがって、波長λｌとλ２．λ８とλ番を通過域にす
ることは容易に設定することができる。たとえば、結合
長が短いと通過帯域幅は広くなり、逆に結合長が長いと
通過帯域幅は狭くなる。すなわち、波長λ８．λ番の光
信号は結合部１８−１．１８−２．１８−３で結合して
もう一つの導波路に分波され、波長λｌ、λ２の光信号
は分波されずにそのまま出力側の導波路に伝搬していく
特性である。Therefore, the wavelengths λl and λ2. It is easy to set λ8 and λ number as the passband. For example, the shorter the coupling length, the wider the passband width, and conversely, the longer the coupling length, the narrower the passband width. That is, the wavelength λ8. The optical signal number λ is coupled at the coupling part 18-1.18-2.18-3 and demultiplexed to another waveguide, and the optical signals with wavelengths λl and λ2 are not demultiplexed and are directly sent to the output side. This is a characteristic of propagation in a waveguide.
ここで、波長λ工とλ２は極めて接近しているか、ある
いは等しくしてもよい。また波長λ３と１番も極めて接
近しているか、あるいは等しくてもよい。Here, the wavelengths λ and λ2 may be very close to each other or may be equal. Further, the wavelength λ3 and the wavelength 1 may be very close to each other or may be equal to each other.
そして、光ファイバ６−１には波長λ１とλ３の光信号
が、光ファイバ６−２には波長λ２と１番の光信号が伝
搬するように構成されている。The optical fiber 6-1 is configured so that optical signals with wavelengths λ1 and λ3 are propagated, and the optical fiber 6-2 is configured such that an optical signal with wavelength λ2 and number 1 is propagated.
第１図の動作について述べる。光ファイバ６−１内を矢
印７−１方向から波長λ１とλ２の光信号が伝搬して光
合分波モジュール８の導波路１９−１に入射する。そし
て方向性結合器５−１により、波長λ８の光信号は分波
されて導波路１９−２内を伝搬する。波長λ１の光信号
は分波されず、そのまま導波路１９−１内を伝搬してい
く、そして方向性結合器５−２に入射する。しかし波長
λ１の光信号は分波されず、そのまま導波路１９−１内
を伝搬し、受光素子２内に入り、受光される。The operation shown in FIG. 1 will be described. Optical signals of wavelengths λ1 and λ2 propagate in the optical fiber 6-1 from the direction of arrow 7-1 and enter the waveguide 19-1 of the optical multiplexing/demultiplexing module 8. The optical signal of wavelength λ8 is then demultiplexed by the directional coupler 5-1 and propagated within the waveguide 19-2. The optical signal with the wavelength λ1 is not demultiplexed and propagates through the waveguide 19-1 as it is, and then enters the directional coupler 5-2. However, the optical signal of wavelength λ1 is not demultiplexed, propagates through the waveguide 19-1 as it is, enters the light receiving element 2, and is received.
導波路１９−２に分波された波長λδの光信号は方向性
結合器５−３内に入り、ここでふたたび分波されて導波
路１９−４内を伝搬し、受光素子４内に入り、受光され
る。半導体発光素子１からの発光波長λ番の光信号は、
方向性結合器５−２に入射し、ここで分波されて導波路
１９−１内を伝搬していく、そして方向性結合器５−１
内に入り、ふたたび分波されて導波路１９−２内を伝搬
し、光ファイバ６−２内を通って矢印７−２方向に伝搬
していく、半導体発光素子３からの発光波長λ２の光信
号は、方向性結合器５−３に入射するが、ここで分波さ
れず導波路１９−２内を伝搬し次の方向性結合器５−１
に入射する。そしてこの方向性結合器５−１でも分波さ
れず、そのまま導波路１９−２内を伝搬し、光ファイバ
６−２内に入って矢印７−２の方向に波長１番の光信号
と共に伝搬していく、この構成での波長間のアイソレー
ション特性について説明する。矢印７−１方向に伝搬し
てきた波長λｌと１２間のアイソレーションを考えると
、方向性結合器５−１で波長λ３の光信号の一部が、た
とえば導波路１９−２に完全な分波されずに、導波路１
９−１内を伝搬したとしても、次の方向性結合器５−２
で、波長λみの光信号は導波路１９−３に分波されてし
まい、受光素子２内には波長λ１の光信号のみが入射す
ることになる。逆に、波長λ１の光信号の一部が導波路
１９−２内に分波されたとしても、次の方向性結合器５
−３で導波路１９−２内をそのまま伝搬していくために
、受光素子４内には波長λｌの光信号はもれてこない。The optical signal of wavelength λδ that has been demultiplexed into the waveguide 19-2 enters the directional coupler 5-3, where it is demultiplexed again, propagates through the waveguide 19-4, and enters the light receiving element 4. , the light is received. The optical signal with the emission wavelength λ from the semiconductor light emitting device 1 is
The signal enters the directional coupler 5-2, is split here, and propagates within the waveguide 19-1, and then passes through the directional coupler 5-1.
The light with the emission wavelength λ2 from the semiconductor light emitting element 3 enters the interior, is split again, propagates within the waveguide 19-2, and propagates in the direction of arrow 7-2 through the optical fiber 6-2. The signal enters the directional coupler 5-3, but is not split here and propagates within the waveguide 19-2 to the next directional coupler 5-1.
incident on . It is not demultiplexed by this directional coupler 5-1, but propagates as it is in the waveguide 19-2, enters the optical fiber 6-2, and propagates along with the optical signal of wavelength 1 in the direction of arrow 7-2. The isolation characteristics between wavelengths in this configuration will now be explained. Considering the isolation between wavelengths λl and 12 that have propagated in the direction of arrow 7-1, a part of the optical signal with wavelength λ3 in directional coupler 5-1 is completely demultiplexed into waveguide 19-2, for example. waveguide 1 without being
9-1, the next directional coupler 5-2
Therefore, the optical signal with the wavelength λ is split into the waveguide 19-3, and only the optical signal with the wavelength λ1 enters the light receiving element 2. Conversely, even if a part of the optical signal with wavelength λ1 is demultiplexed into the waveguide 19-2, the next directional coupler 5
-3, the optical signal with the wavelength λl does not leak into the light receiving element 4 because it propagates in the waveguide 19-2 as it is.
すなわち、波長λ１とλ３のアイソレーション特性は極
めて良好な構成であることがわかる。同様に、波長λ２
とλ４のアイソレーション特性も良好である。また、同
一構造寸法の方向性結合器３個で構成されているので、
−個の方向性結合器のマスクを作っておいて、転写露光
するだけで簡単に作れる。そのため、マスク費用が大幅
に安くなる。また、−個の方向性結合器のマスクだけで
よいので、小面積マスクとなり、マスクの寸法精度を高
精度化でき、それによって高性能の方向性結合器を実現
することができる。That is, it can be seen that the configuration has extremely good isolation characteristics for wavelengths λ1 and λ3. Similarly, the wavelength λ2
The isolation characteristics of λ4 and λ4 are also good. In addition, since it is composed of three directional couplers with the same structural dimensions,
- It can be easily made by making masks for individual directional couplers and performing transfer exposure. Therefore, the mask cost will be significantly reduced. Furthermore, since only - masks for directional couplers are required, the area of the mask is small and the dimensional accuracy of the mask can be improved, thereby realizing a high-performance directional coupler.
さらに、光合分波装置を一枚の基板上にモノリシック構
造に実現することができるので、量産による大幅な低コ
スト化が可能である。さらに、光モジュール８は対称な
構造であるので、温度変動による結合部１８−１．１８
−２．１８−３、導波路１９−１．１９−２．１９−３
ののびちぢみが同じであり、光学特性の劣化を緩和する
ことができる。Furthermore, since the optical multiplexing/demultiplexing device can be realized in a monolithic structure on a single substrate, it is possible to significantly reduce costs through mass production. Furthermore, since the optical module 8 has a symmetrical structure, the coupling portion 18-1.18 due to temperature fluctuations.
-2.18-3, waveguide 19-1.19-2.19-3
The expansion and shrinkage are the same, and deterioration of optical characteristics can be alleviated.
第３図は本発明の波長多重双方向伝送方法の別の実施例
を示したものである。これは、光ファイバ６−１内を矢
印２８−１方向に波長λ１の光信号を、矢印２８−２方
向に波長λ８の光信号を伝搬させ、一本の光ファイバ内
を双方向伝搬させである。また光ファイバ６−２内も矢
印２８−３方向に波長λ２を、矢印２８−３と反対方向
（矢印２８−４方向）に波長１番に光信号を双方向伝送
させるようにしたものである。すなわち、各々の光ファ
イバ内を波長多重双方向伝送させるという全く新しい構
成である。FIG. 3 shows another embodiment of the wavelength multiplexing bidirectional transmission method of the present invention. This allows an optical signal of wavelength λ1 to be propagated in the direction of arrow 28-1 in the optical fiber 6-1, and an optical signal of wavelength λ8 to be propagated in the direction of arrow 28-2, allowing bidirectional propagation in one optical fiber. be. Furthermore, within the optical fiber 6-2, an optical signal is bidirectionally transmitted with wavelength λ2 in the direction of arrow 28-3 and with wavelength 1 in the opposite direction to arrow 28-3 (direction of arrow 28-4). . In other words, this is a completely new configuration in which wavelength multiplexing and bidirectional transmission is performed within each optical fiber.
第４図は本発明の波長多重双方向伝送方法の別の実施例
を示したものである。これは、矢印７−１方向へ光ファ
イバ６−１内を波長λ１０１ λ１１゜・・・、λ１ｎ
ｇ λ３０．λｑｌ？・・・、λ８．の光信号を伝送さ
せるようにしたものである。ここで、λ１０１λ１１．
・・・、λＩｎは波長λｌのごく近傍の波長で、狭スペ
クトル幅の光信号である。またλ３０１ λδｌ。FIG. 4 shows another embodiment of the wavelength multiplexing bidirectional transmission method of the present invention. This causes wavelengths λ101 λ11°..., λ1n
g λ30. λql? ..., λ8. It is designed to transmit optical signals. Here, λ101λ11.
..., λIn has a wavelength very close to the wavelength λl, and is an optical signal with a narrow spectral width. Also λ301 λδl.
・・・、λｌ１ｍは波長λ８のごく近傍の波長で、狭ス
ペクトル幅の光信号である。なお、ｎ、ｍは整数である
。超波長多重伝送方法の実施例である。波長λ１０９
λ１１．λ１２．．・・・、λＩｎの光信号は波長選択
素子１１に入射する。この゛波長選択素子１１は上記波
長の中から希望する波長の光信号を選択的に出力側にと
りだす。そして受光素子２内に入射させる。この波長選
択素子はたとえば、可変波長フィルタで実現することが
できる。波長λ１１０．λ８１゜・・・、１８ｍの光信
号は波長選択素子１２に入射する。..., λl1m has a wavelength very close to the wavelength λ8, and is an optical signal with a narrow spectrum width. Note that n and m are integers. This is an example of a super wavelength multiplexing transmission method. Wavelength λ109
λ11. λ12. ．． ..., λIn is incident on the wavelength selection element 11. This wavelength selection element 11 selectively takes out an optical signal of a desired wavelength from among the above-mentioned wavelengths to the output side. Then, the light is made to enter the light receiving element 2. This wavelength selection element can be realized, for example, by a variable wavelength filter. Wavelength λ110. The optical signal of λ81° . . . , 18 m enters the wavelength selection element 12.
そして波長選択素子１２では、受信者の希望による波長
、たとえばλ８Ｂの光信号がとりだされ、受光素子４内
に入射される。The wavelength selection element 12 extracts an optical signal having a wavelength desired by the receiver, for example, λ8B, and inputs it into the light receiving element 4.
第５図は本発明の波長多重双方向伝送方法の別の実施例
を示したものである。これも超波長多重双方向伝送の一
例である。すなわち、光ファイバ６−２内を矢印７−２
方向に波長λ２と、λａｏｔλ４１．λ４２．・・・、
１口の光信号を伝送するようにしたものである。光ファ
イバ６−１内は第４図の場合と同じである。これは、複
数個の半導体発光素子１．４−１．１４−２．・・・、
１４−にの光信号を合波素子１３で合波した後、光ファ
イバ６−２内を伝搬させるようにしたものである。ただ
し、ｋは整数である。FIG. 5 shows another embodiment of the wavelength multiplexing bidirectional transmission method of the present invention. This is also an example of super wavelength multiplexing bidirectional transmission. In other words, the inside of the optical fiber 6-2 is indicated by the arrow 7-2.
wavelength λ2 in the direction, λaotλ41 . λ42. ...,
It is designed to transmit one optical signal. The interior of the optical fiber 6-1 is the same as that shown in FIG. This includes a plurality of semiconductor light emitting devices 1.4-1.14-2. ...,
14- is multiplexed by the multiplexing element 13, and then propagated through the optical fiber 6-2. However, k is an integer.
本発明によれば、２本の光ファイバを用いた光波長多重
双方向伝送用光合分波装置を非常に簡易な構成で、低コ
ストに実現することができる。しかもそれぞれの波長間
の干渉が極めて少ない高アイソレーシヨン特性を実現す
ることができる。According to the present invention, an optical multiplexing/demultiplexing device for optical wavelength multiplexing bidirectional transmission using two optical fibers can be realized with a very simple configuration and at low cost. Furthermore, high isolation characteristics with extremely little interference between wavelengths can be achieved.
第１図、第３図、第４図、および第５図はそれぞれ本発
明の光波長多重双方向伝送方法の実施例を示す図、第２
図は本発明に用いる方向性結合器の損失−波長特性図、
第６図は従来の２本の光ファイバを用いた双方向伝送方
法の概略図、第７図は従来の１本の光ファイバを用いた
光波長多重双方向伝送方法の概略図である。
１．３，１０．１４−１〜１４−ｋ・・・発光素子、２
．４．９・・・受光素子、５−１〜５−３・・・方向性
結合器、６−１．６−２・・・光ファイバ、７−１゜７
−２．２８−１〜２８−４・・・光の伝搬方向を示す矢
印、８・・・光モジュール、１１．１２・・・波長選択
素子、１３・・・合波素子、１５−１〜１５−４・・・
光送信部、１６−１〜１６−４・・・光受信部、１７−
１．１７−２・・・光合分波器、１８−１〜１８−石
Ｚ 図
波長 （μ’ｗｔ）
心）ＣＥ）
へ ６ｑFIG. 1, FIG. 3, FIG. 4, and FIG. 5 are diagrams showing an embodiment of the optical wavelength multiplexing bidirectional transmission method of the present invention, and FIG.
The figure shows a loss-wavelength characteristic diagram of the directional coupler used in the present invention.
FIG. 6 is a schematic diagram of a conventional bidirectional transmission method using two optical fibers, and FIG. 7 is a schematic diagram of a conventional optical wavelength multiplexing bidirectional transmission method using one optical fiber. 1.3, 10.14-1 to 14-k... light emitting element, 2
．． 4.9... Light receiving element, 5-1 to 5-3... Directional coupler, 6-1.6-2... Optical fiber, 7-1゜7
-2.28-1 to 28-4... Arrow indicating the propagation direction of light, 8... Optical module, 11.12... Wavelength selection element, 13... Multiplexing element, 15-1... 15-4...
Optical transmitter, 16-1 to 16-4... Optical receiver, 17-
1.17-2... Optical multiplexer/demultiplexer, 18-1 to 18-stone
Z diagram wavelength (μ'wt) heart) CE) to 6q
Claims (1)
２つの入力側導波路にそれぞれ光ファイバを接続し、２
つの出力側導波路には、該第１方向性結合器と同一構造
の第２、第３方向性結合器の入力側薄波路の一方を接続
し、該第２、第３方向性結合器の出力側導波路４つに半
導体発光素子または受光素子を接続し、上記２つの光フ
ァイバ内を少なくとも波長の異なる２波の光信号が伝送
されることを特徴とする波長多重双方向伝送方法。 ２、特許請求の範囲第１項において、受光素子の前に波
長選択素子を設け、任意の波長の光信号を選択的に受光
素子に受信させるようにした波長多重双方向伝送方法。 ３、特許請求の範囲第１又は２項において、半導体発光
素子の前に合波素子を設け、該合波素子に波長の異なる
複数の発光素子の光信号を入力させるようにした波長多
重双方向伝送方法。[Claims] An optical fiber is connected to each of the two input side waveguides of a first directional coupler formed by coupling one and two waveguides,
One of the input side thin waveguides of the second and third directional couplers having the same structure as the first directional coupler is connected to the two output side waveguides. A wavelength multiplexing bidirectional transmission method characterized in that semiconductor light emitting devices or light receiving devices are connected to four output waveguides, and at least two optical signals having different wavelengths are transmitted within the two optical fibers. 2. The wavelength multiplexing bidirectional transmission method according to claim 1, wherein a wavelength selection element is provided in front of the light receiving element so that the light receiving element selectively receives an optical signal of an arbitrary wavelength. 3. A bidirectional wavelength multiplexing device according to claim 1 or 2, wherein a multiplexing element is provided in front of the semiconductor light emitting element, and optical signals from a plurality of light emitting elements having different wavelengths are input to the multiplexing element. Transmission method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62121221A JPS63287125A (en) | 1987-05-20 | 1987-05-20 | Wavelength multiplex bidirectional transmission method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62121221A JPS63287125A (en) | 1987-05-20 | 1987-05-20 | Wavelength multiplex bidirectional transmission method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63287125A true JPS63287125A (en) | 1988-11-24 |
Family
ID=14805891
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62121221A Pending JPS63287125A (en) | 1987-05-20 | 1987-05-20 | Wavelength multiplex bidirectional transmission method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63287125A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05289120A (en) * | 1992-04-09 | 1993-11-05 | Fujitsu Ltd | Optical waveguide device |
| FR2768567A1 (en) * | 1997-09-12 | 1999-03-19 | France Telecom | WAVELENGTH-INTEGRATED INTEGRATED OPTICAL SOURCE, MANUFACTURING METHOD THEREFOR, APPLICATION TO TRANSMIT-RECEIVE MODULES AND BIDIRECTIONAL TRANSMISSION SYSTEMS |
| JP2001230733A (en) * | 2000-02-16 | 2001-08-24 | Kddi Corp | Bidirectional wavelength multiplex optical communication system |
| JP2005333264A (en) * | 2004-05-18 | 2005-12-02 | Ntt Electornics Corp | Single-core bidirectional optical wavelength multiplex transmission system and transceiver |
-
1987
- 1987-05-20 JP JP62121221A patent/JPS63287125A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05289120A (en) * | 1992-04-09 | 1993-11-05 | Fujitsu Ltd | Optical waveguide device |
| FR2768567A1 (en) * | 1997-09-12 | 1999-03-19 | France Telecom | WAVELENGTH-INTEGRATED INTEGRATED OPTICAL SOURCE, MANUFACTURING METHOD THEREFOR, APPLICATION TO TRANSMIT-RECEIVE MODULES AND BIDIRECTIONAL TRANSMISSION SYSTEMS |
| EP0903818A1 (en) * | 1997-09-12 | 1999-03-24 | France Telecom | Integrated optical device with wavelength selective switching and method of fabrication |
| JP2001230733A (en) * | 2000-02-16 | 2001-08-24 | Kddi Corp | Bidirectional wavelength multiplex optical communication system |
| JP4507032B2 (en) * | 2000-02-16 | 2010-07-21 | Ｋｄｄｉ株式会社 | Bidirectional wavelength division multiplexing optical communication system |
| JP2005333264A (en) * | 2004-05-18 | 2005-12-02 | Ntt Electornics Corp | Single-core bidirectional optical wavelength multiplex transmission system and transceiver |
| JP4597578B2 (en) * | 2004-05-18 | 2010-12-15 | Ｎｔｔエレクトロニクス株式会社 | Single-core bidirectional optical wavelength division multiplexing transmission system and transmitter / receiver |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6185023B1 (en) | Optical add-drop multiplexers compatible with very dense WDM optical communication systems | |
| US5748349A (en) | Gratings-based optical add-drop multiplexers for WDM optical communication system | |
| US6169828B1 (en) | Fiber optic dense wavelength division multiplexer with a phase differential method of wavelength separation utilizing a polarization beam splitter and a nonlinear interferometer | |
| US6118561A (en) | Wavelength division multiplexing optical transmitter and wavelength division multiplexing-demultiplexing optical transmission-reception system | |
| JP3448182B2 (en) | All-optical fiber optical router | |
| JP2977024B2 (en) | Optical circuit for wavelength division multiplexing communication and optical transmission communication system including the same | |
| US6041152A (en) | Multi-channel fiber optic communications system and multiplexer/demultiplexer arrangement therefor | |
| JPH10221560A (en) | Optical wavelength filter and optical demultiplexer | |
| JPH10153721A (en) | Taking-out and inserting device for wavelength-multiplex channel | |
| JP2001215349A (en) | Multiplex/de-multiplex system for wavelength multiplex optical signal | |
| US6819481B2 (en) | Bidirectional wave division multiplex systems | |
| US6552834B2 (en) | Methods and apparatus for preventing deadbands in an optical communication system | |
| JPS63287125A (en) | Wavelength multiplex bidirectional transmission method | |
| EP1089097A2 (en) | Duplicated-port waveguide grating router having substantially flat passbands | |
| JP2004135331A (en) | Optical cross-connect system | |
| JPS60172841A (en) | Optical switch | |
| EP1009120A2 (en) | Multichannel optical ADD/DROP, multiplexor/demultiplexor | |
| JP2003315570A (en) | Optical wavelength multiplexer/demultiplexer | |
| JP3740357B2 (en) | Optical multiplexer / demultiplexer with improved group delay characteristics | |
| JP3832742B2 (en) | Optical multiplexer / demultiplexer | |
| JP3308148B2 (en) | Optical submarine cable branching device for WDM communication system and WDM optical submarine cable network using the same | |
| JPH07212316A (en) | Bi-directional light amplifier | |
| JP4238069B2 (en) | Optical wavelength multiplexer / demultiplexer | |
| JP3412791B2 (en) | Optical frequency multiplexer / demultiplexer | |
| US6453089B1 (en) | Fiber optic dense wavelength division multiplexer for separating and combining optical channels utilizing a polarization beam splitter and a nonlinear interferometer |