JPS5890841A - Optical fiber communication system - Google Patents

Optical fiber communication system

Info

Publication number
JPS5890841A
JPS5890841A JP56188584A JP18858481A JPS5890841A JP S5890841 A JPS5890841 A JP S5890841A JP 56188584 A JP56188584 A JP 56188584A JP 18858481 A JP18858481 A JP 18858481A JP S5890841 A JPS5890841 A JP S5890841A
Authority
JP
Japan
Prior art keywords
optical
optical fiber
transmission line
repeater
fiber transmission
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
Application number
JP56188584A
Other languages
Japanese (ja)
Other versions
JPS6251532B2 (en
Inventor
Kazuyoshi Oshima
一能 大島
Teruhito Matsui
松井 輝仁
Katsuyoshi Ito
伊東 克能
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP56188584A priority Critical patent/JPS5890841A/en
Publication of JPS5890841A publication Critical patent/JPS5890841A/en
Publication of JPS6251532B2 publication Critical patent/JPS6251532B2/ja
Granted legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B10/00Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/29Repeaters

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Small-Scale Networks (AREA)
  • Optical Communication System (AREA)

Abstract

PURPOSE:To eliminate the fluctuation of optical signal level at each data terminal and to make the reception gain control easy, by providing an optical repeater for an optical fiber common transmission line. CONSTITUTION:Data terminals 4-7 are coupled to an optical fiber transmission line 1 via optical directional couplers 3 and optical branching couplers 11-14, and an optical repeater 10 is coupled to the transmission line 1 via an optical directional coupler 9. After a transmitted optical signal from the terminals 4-7 is once transmitted to the right direction and folded at the repeater 10, it is received at the terminals. In this case, the transmitted optical power from the terminals 4-7 is suitably controlled or the rate of optical branching and coupling of the optical branching couplers 11-14 is set to a value different from each terminal for optimization, allowing to supply optical power of almost equal amount of an optical receiver at the terminal 4-7.

Description

【発明の詳細な説明】 この発明は、1本の線状光ファイバを共通伝送として用
いた光ファイバ通信方式に関するものである。
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an optical fiber communication system using one linear optical fiber for common transmission.

従来、この種の装置として第1図に示すものがあった。Conventionally, there has been a device of this type as shown in FIG.

この図において、1は光フアイバ伝送路、2はこの光フ
アイバ伝送路1に挿入配置された光分岐結合器、3はこ
の光分岐結合器2に接続された送受分離用の光方向性結
合器、4〜8は前記党分岐結金is2および送受分離用
の光方向性結合器3を介して光ファイバ伝送路IK接続
されたデータステーションである。
In this figure, 1 is an optical fiber transmission line, 2 is an optical branching coupler inserted into this optical fiber transmission line 1, and 3 is an optical directional coupler for sending and receiving separation connected to this optical branching coupler 2. , 4 to 8 are data stations connected to the optical fiber transmission line IK via the branching connection IS2 and the optical directional coupler 3 for separating transmission and reception.

次に、動作について説明する。Next, the operation will be explained.

各データステーション4〜8は、1本の光フアイバ伝送
路1を共有して、N対Nの相互通信を行う、データステ
ーション4〜8の1つから送信された光信号は、光分岐
結合器2によって光フアイバ伝送路1に結合され、光フ
アイバ伝送路1の左右両方向に伝搬して行く。光フアイ
バ伝送路1を伝搬する光信号は、各々の光分岐結合器2
においてその光パワーの一部が分岐され、各データステ
ーション4〜8に送られる。データステーション4〜8
では、自局あての信号のみを抽出して受信する。N対N
の多元接続化には、例えば時分割多元接続(TDMム:
 Time Division Multiple A
ccess)方式によるバーストモード通信が適用され
る。
Each of the data stations 4 to 8 shares one optical fiber transmission line 1 and performs N-to-N mutual communication. 2 to the optical fiber transmission line 1, and propagates in both left and right directions of the optical fiber transmission line 1. The optical signal propagating through the optical fiber transmission line 1 is transmitted through each optical branch/coupler 2.
A part of the optical power is branched off at the branch point and sent to each data station 4-8. Data station 4-8
Then, only the signal addressed to the local station is extracted and received. N to N
For example, time division multiple access (TDM) is used for multiple access.
Time Division Multiple A
Burst mode communication based on the ``ccess'' method is applied.

従来の光フアイバ通信方式は以上のような方式であるの
で、1つのデータステーションから他のデータステーシ
ョンへの伝送損失が、通信する光分岐結合器2の数に応
じて変化するこiTKなり、ここにTDMA方−等の多
元接続技術を適用すると、1つの局に到来する各局から
の光信号レベルが送信局ごとに大きく変化するため、光
受信器には受信利得制御等の構成に著しい困難を伴うと
同時に伝送される信号の品質劣化を生じるという欠点が
あった。
Since the conventional optical fiber communication system is as described above, the transmission loss from one data station to another data station changes depending on the number of optical branching couplers 2 that communicate. When multiple access technology such as TDMA is applied to a single station, the optical signal level from each station arriving at one station varies greatly from transmitting station to transmitting station, making it extremely difficult to configure reception gain control etc. for the optical receiver. However, there is a drawback in that the quality of the signal transmitted at the same time is degraded.

この発明は、上記のような従来のものの欠点を除去する
ためになされたもので、光フアイバ共通伝送路に新たに
光中継装置を接続し、各データステーションからの光信
号はすべて一度この光中継装置を経由して中継増幅され
た後、他のデータステージ4ンに放送モードで分配され
るように構成することにより、各データステーションに
おける光信号レベル変動をなくし、受信利得制御上の困
難を回避する方式を提供することを目的としている・以
下、この発明について説明する。
This invention was made in order to eliminate the drawbacks of the conventional ones as described above, and it connects a new optical repeater to a common optical fiber transmission line, and all optical signals from each data station are transmitted once to this optical repeater. By configuring the signal so that it is relayed and amplified via the device and then distributed to the other four data stages in broadcast mode, fluctuations in the optical signal level at each data station are eliminated and difficulties in controlling reception gain are avoided. This invention will be explained below.

第2図はこの発明の一実施例を示すものである。FIG. 2 shows an embodiment of the present invention.

第2図において、1は光フアイバ伝送路、11〜14は
この光フアイバ伝送路1に挿入配置された光分岐納金器
、3は前記光分岐結合器11〜14に光ファイバで接続
された送受分離用の光方向性・結合器、4〜1は前記光
分岐結合器11〜14および光方向性結合器3を介し【
光フアイバ伝送路1に結合されたデータステーション、
■は前記光ファイバ伝送路IKII続された送受分離用
の光方向性結合器、10は前記光方向性結合器9を介し
て光フアイバ伝送路1に結合され、各データステーショ
ン4〜7からの光信号を中継増幅して再び光フアイバ伝
送路1に光信号を送り出す光中継装置である。
In FIG. 2, 1 is an optical fiber transmission line, 11 to 14 are optical branching devices inserted into the optical fiber transmission line 1, and 3 is a transmitting/receiving device connected to the optical branching couplers 11 to 14 by an optical fiber. The optical directional couplers 4 to 1 for separation are connected via the optical branch couplers 11 to 14 and the optical directional coupler 3.
a data station coupled to the fiber optic transmission line 1;
(2) is an optical directional coupler connected to the optical fiber transmission line IKII for transmitting and receiving separation, and 10 is coupled to the optical fiber transmission line 1 via the optical directional coupler 9, and the optical directional coupler 10 is connected to the optical fiber transmission line 1 through the optical directional coupler 9, and is connected to the optical fiber transmission line IKII. This is an optical repeater that relays and amplifies an optical signal and sends the optical signal to the optical fiber transmission line 1 again.

次に、動作について説明する。Next, the operation will be explained.

第2図において、データステーション4〜Tから送信さ
れる波長λの光信号は、送受分離用の光方向性結合器3
を通過し、光分岐結合器111−14により光フアイバ
伝送路1に結合され、図の右側の方向へ光フアイバ伝送
路1内を伝搬し、送受分離用の光方向性結合器−をとお
り、光中継装置10に受信される。受信された信号は前
記光中継装置10により中継増幅され、再び光フアイバ
伝送路1に送出され、図の左側の方向へ光フアイバ伝送
路1内を伝搬して行く、光フアイバ伝送路1を左側の方
向へ伝搬する光信号は、各々の光分岐結合器11〜14
において、その光パワーの一部が、次々と各データステ
ーション4〜1へ分配されて行く。
In FIG. 2, optical signals of wavelength λ transmitted from data stations 4 to T are transmitted to an optical directional coupler 3 for separating transmission and reception.
, is coupled to the optical fiber transmission line 1 by the optical branching coupler 111-14, propagates within the optical fiber transmission line 1 in the right direction in the figure, passes through an optical directional coupler for transmitting and receiving separation, It is received by the optical repeater 10. The received signal is relayed and amplified by the optical repeater 10, sent out again to the optical fiber transmission line 1, and propagated within the optical fiber transmission line 1 in the left direction in the figure. The optical signal propagating in the direction of
A portion of the optical power is then distributed to each data station 4-1 one after another.

このとき、各データステーション4〜1からのfノ(ワ
ーを適当に制御してやるか、あるいは光分岐結合器11
〜14の光分岐結合比率を各データステーション4〜1
ごとに異なる値に設定し、最適化を図るととKより、光
中継装置10における各データステーション4〜1から
の受信光レベルを発信局によらず一定にすることができ
、光受信器の受信利得制御棒構が簡略化される。光送信
パワーを制御する方法としては、例えば光中継装置10
から送られてくる光レベルをモニタするととにより、光
中継装置10までの伝送損失に応じて、各データステー
ション4〜Tでの光送信パワーを制御することがゼ會る
At this time, either the f-power from each data station 4 to 1 is appropriately controlled, or the optical branching coupler 11
~14 optical branching/coupling ratios for each data station 4~1
By setting different values for each data station and optimizing, the level of received light from each data station 4 to 1 in the optical repeater 10 can be made constant regardless of the transmitting station, and the optical receiver's The receiving gain control rod structure is simplified. As a method of controlling the optical transmission power, for example, the optical repeater 10
By monitoring the level of light sent from the optical repeater 10, it is possible to control the optical transmission power at each data station 4 to T in accordance with the transmission loss up to the optical repeater 10.

一方、各データステーション4〜TKおける光受信器で
は、光中継装置10からの光信号のみを受信するりで、
受信レベルの大幅な変動はなく、受信利得制御上の困難
は生ビない。特に光分岐結合器11〜14の光分岐結合
比率を最適化しておく場合には、各データステーション
4〜Tにほぼ等分するように光パワーを供給できるので
、システム全体としての信号伝送品質の向上を期待でき
るという利点がある。
On the other hand, the optical receivers in each data station 4 to TK receive only the optical signal from the optical repeater 10.
There are no significant fluctuations in the reception level, and there are no difficulties in controlling the reception gain. In particular, if the optical branching/coupling ratio of the optical branching/coupling units 11 to 14 is optimized, it is possible to supply optical power to each data station 4 to T in approximately equal parts, which improves the signal transmission quality of the entire system. The advantage is that you can expect improvement.

信号の多元接続化には、時分割多元接続(TDMA)方
式2周波数分割多元接続(FDMA:Frequenc
y Division Multiple Acces
s )方式、拡散周波数多元接続(88M A : 8
pread 8pectrumMultiple Ac
cess )方式等いずれの方式の適用も可能である。
For signal multiple access, two time division multiple access (TDMA) systems and two frequency division multiple access (FDMA) systems are used.
y Division Multiple Access
s) method, spread frequency multiple access (88MA: 8
pread 8pectrumMultiple Ac
It is possible to apply any method such as the cess) method.

一例として、TDMA方式の適用を考えると、各データ
ステージ1ンは、その中の1つの局が送出するフレーム
の基準となる信号をもとに互いの送信タイミングが重な
らないように、自局の信号をバースト状に送信するとと
になる。光中継装置10では各データステーション4〜
1から送られてきた光バースト信号列を受信し、これを
中継増幅して再び光バースト信号として、各データステ
ージ目ン4〜1へ送り出す。各データステージ曹ン4〜
1では、送られてきたバースト信号がら自局あての信号
のみを抜き出して受信する。光中継装置10からの下り
信号は、必ずしもバーストモード伝送でなくてもよく、
連結モードの時分割多重伝送であってもよい。
As an example, considering the application of the TDMA system, each data stage 1 is configured to transmit data from its own station based on the reference signal of the frame transmitted by one of the stations, so that the transmission timings of each station do not overlap. If the signal is sent in bursts, this will result. In the optical repeater 10, each data station 4~
It receives the optical burst signal train sent from 1, relays and amplifies it, and sends it out again as an optical burst signal to each data stage 4 to 1. Each data stage 4~
1, only the signal addressed to the local station is extracted from the burst signals sent and received. The downlink signal from the optical repeater 10 does not necessarily have to be burst mode transmission,
Concatenated mode time division multiplex transmission may also be used.

なお、上記実施例では、光中継装置10を線状の光フア
イバ伝送路1の一端に設けたが、光ファイバ伝送路1の
他の位置に設置してもよい。また、光フアイバ伝送路1
の任意の箇所に1双方向性の光中継装置10を挿入設置
することにより、接続データステーション数の増加や光
フアイバ伝送路長の延長に対処することが可能である。
In the above embodiment, the optical repeater 10 is provided at one end of the linear optical fiber transmission line 1, but it may be installed at another position on the optical fiber transmission line 1. In addition, optical fiber transmission line 1
By inserting and installing a one-way optical repeater 10 at an arbitrary location, it is possible to cope with an increase in the number of connected data stations and an extension of the optical fiber transmission path length.

また各データステージ式ン4〜1での光分岐結合器11
〜14と送受分離用の光方向性結合器3をそれぞれ独立
した部品として扱ったが、両者を一体化した光回路部品
であっても同様の効果が得られる。
In addition, the optical branching coupler 11 at each data stage type 4 to 1
14 and the optical directional coupler 3 for transmitting/receiving separation are treated as independent components, but the same effect can be obtained even if the two are integrated into an optical circuit component.

以上詳細に説明したようにこの発明によれば、複数のデ
ータステーション間の相互通信を、光中継装置を一度経
由して行うととKより、各局の光受信器に到来する光信
号のレベルを、発信局によらず一定にすることができる
ので、従来方式のよ5な受信利得制御に対する困難が生
じないという効果がある。
As explained in detail above, according to the present invention, if mutual communication between a plurality of data stations is performed once via an optical repeater, the level of the optical signal arriving at the optical receiver of each station can be adjusted by K. , can be kept constant regardless of the transmitting station, so there is no difficulty in controlling the reception gain as in the conventional system.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は従来の光フアイバ通信方式の実施例を示す構成
図、JllI2図はこの発明の一実施例を示す構成図で
ある。 図中、1は光フアイバ伝送路、3.sは光方向性結合器
、4〜1はデータステーション、10は光中継装置、1
1〜14は光分岐結合器である。 なお、図中の同一符号は同一または相当部分を示す。 代理人 葛野信−(外1名) 第1図 4   5   6       7
FIG. 1 is a block diagram showing an embodiment of a conventional optical fiber communication system, and FIG. 12 is a block diagram showing an embodiment of the present invention. In the figure, 1 is an optical fiber transmission line; 3. s is an optical directional coupler, 4 to 1 are data stations, 10 is an optical repeater, 1
1 to 14 are optical branching couplers. Note that the same reference numerals in the figures indicate the same or corresponding parts. Agent Makoto Kuzuno (1 other person) Figure 1 4 5 6 7

Claims (1)

【特許請求の範囲】 (11線状に配した1本の光フアイバ伝送路と、この光
フアイバ伝送路に複数個の光分岐結合器並びに送受分離
用の光方向性結合器を介してそれぞれ接続されたIIL
数情のデータステーションと、前記光フアイバ伝送路に
接続された各データステーションからの光信号を受信し
て中継増幅の後、同一の光波長の光信号として返送され
る機能を有する光中継装置とにより光フアイバ伝送系を
構成し、前記各データステーション間の多数局間相互通
信を前記光中継装置を一度経由して行うことを%徴とす
る光フアイバ通信方式。 (2)各光分岐結合器の光分岐結合比率を、光中継装置
での受信光レベルが発信局によらず一定になるよ5に設
定したことを特徴とする特許請求の範囲第(11項記載
の光フアイバ通信方式。 ゛(3)各データステーションからの送信光パワーを、
光中継装置における受信光レベルが発信局によらず一定
になるように制御することを特徴とする特許請求の範囲
第+11項記載の光フアイバ通信方式。 (41光中継装置は、光フアイバ伝送路の任意の箇所に
少なくとも1個の双方向性の光中継増幅装置が設けられ
ることを特徴とする特許請求の範囲第(1)項記載の光
フアイバ通信方式。
[Claims] (11) One optical fiber transmission line arranged in a linear form, each connected to this optical fiber transmission line via a plurality of optical branching couplers and optical directional couplers for sending and receiving separation. IIL
an optical repeater having a function of receiving an optical signal from each data station connected to the optical fiber transmission line, repeating and amplifying it, and returning it as an optical signal of the same optical wavelength; An optical fiber communication system in which an optical fiber transmission system is constructed, and mutual communication between multiple data stations is performed once through the optical repeater. (2) The optical branching/coupling ratio of each optical branching/coupling device is set to 5 so that the received light level at the optical repeater is constant regardless of the transmitting station. The optical fiber communication method described. ゛(3) The transmission optical power from each data station is
12. The optical fiber communication system according to claim 11, wherein the level of received light in the optical repeater is controlled to be constant regardless of the transmitting station. (41) Optical fiber communication according to claim 1, characterized in that the optical repeater is provided with at least one bidirectional optical repeater amplification device at any location on the optical fiber transmission line. method.
JP56188584A 1981-11-25 1981-11-25 Optical fiber communication system Granted JPS5890841A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56188584A JPS5890841A (en) 1981-11-25 1981-11-25 Optical fiber communication system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56188584A JPS5890841A (en) 1981-11-25 1981-11-25 Optical fiber communication system

Publications (2)

Publication Number Publication Date
JPS5890841A true JPS5890841A (en) 1983-05-30
JPS6251532B2 JPS6251532B2 (en) 1987-10-30

Family

ID=16226225

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56188584A Granted JPS5890841A (en) 1981-11-25 1981-11-25 Optical fiber communication system

Country Status (1)

Country Link
JP (1) JPS5890841A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0510196U (en) * 1991-07-24 1993-02-09 スズキ株式会社 Outboard motor
CN100390585C (en) * 2004-07-13 2008-05-28 杭州恒生普维光电技术有限公司 Optical fiber bus structure and optical fiber bus net

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5494206A (en) * 1978-01-10 1979-07-25 Toshiba Corp Photo transmission system of loop shape
JPS56120233A (en) * 1980-02-27 1981-09-21 Nec Corp Station device for optical data

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5494206A (en) * 1978-01-10 1979-07-25 Toshiba Corp Photo transmission system of loop shape
JPS56120233A (en) * 1980-02-27 1981-09-21 Nec Corp Station device for optical data

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0510196U (en) * 1991-07-24 1993-02-09 スズキ株式会社 Outboard motor
CN100390585C (en) * 2004-07-13 2008-05-28 杭州恒生普维光电技术有限公司 Optical fiber bus structure and optical fiber bus net

Also Published As

Publication number Publication date
JPS6251532B2 (en) 1987-10-30

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