JPH0353628A - Optical communication system - Google Patents
Optical communication systemInfo
- Publication number
- JPH0353628A JPH0353628A JP1189210A JP18921089A JPH0353628A JP H0353628 A JPH0353628 A JP H0353628A JP 1189210 A JP1189210 A JP 1189210A JP 18921089 A JP18921089 A JP 18921089A JP H0353628 A JPH0353628 A JP H0353628A
- Authority
- JP
- Japan
- Prior art keywords
- optical
- signal
- electrical
- modulated
- center
- 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
- 230000003287 optical effect Effects 0.000 title claims abstract description 66
- 238000004891 communication Methods 0.000 title claims abstract description 29
- 238000006243 chemical reaction Methods 0.000 claims abstract description 11
- 230000005540 biological transmission Effects 0.000 claims abstract description 7
- 239000013307 optical fiber Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000007796 conventional method Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000002457 bidirectional effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- MRQNKLRMROXHTI-UHFFFAOYSA-N perfluoro-N-methyldecahydroisoquinoline Chemical compound FC1(F)C(F)(F)C(F)(F)C(F)(F)C2(F)C(F)(F)N(C(F)(F)F)C(F)(F)C(F)(F)C21F MRQNKLRMROXHTI-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Optical Communication System (AREA)
Abstract
Description
【発明の詳細な説明】
〔概要)
多地点とセンタとの間の光通信を行なう光通信方式に関
し、
システムの価格を低く抑えることができ、多重度が大幅
に向上することを目的とし、
多地点とセンタとの間で単一の光伝送路を用いて光通信
を行なう光通信方式において、該多地点夫々で各被変調
信号の周波数帯域が互いに異なるよう通信用の電気信号
を変調した後、同一波長の光信号に電気/光変換を行な
って該光伝送路に送出し、該センタで光/電気変換して
得られた電気信号を各被変調信号に帯域分離し、該各被
変調信号を復調して該多地点夫々の通信号の電気信号を
得るよう構成する。[Detailed Description of the Invention] [Summary] Regarding an optical communication system that performs optical communication between multiple points and a center, the purpose of this invention is to keep the price of the system low and greatly improve the degree of multiplicity. In an optical communication system that performs optical communication using a single optical transmission path between a point and a center, after modulating the electrical signal for communication so that the frequency band of each modulated signal is different at each of the multiple points. , performs electrical/optical conversion on optical signals of the same wavelength and sends them to the optical transmission line, performs optical/electrical conversion at the center, separates the resulting electrical signals into each modulated signal, and separates the band of each modulated signal. It is configured to demodulate the signal and obtain electrical signals of communication signals at each of the multiple points.
〔産業上の利用分野]
本発明は光通信方式に関し、多地点とセンタとの間の光
通信を行なう光通信方式に関する。[Industrial Application Field] The present invention relates to an optical communication system, and more particularly, to an optical communication system for performing optical communication between multiple points and a center.
近年、複数の加入者とセンタとを光ケーブノレで接続し
て双方向の光通信を行なうシステムが開発されている。In recent years, systems have been developed that connect a plurality of subscribers and a center using optical cables to perform bidirectional optical communications.
このようなシステムではセンタから各加入者への通信は
センタが出力する光信号を単に光カブラで各加入者に分
配するだけで良い。In such a system, communication from the center to each subscriber can be accomplished by simply distributing optical signals output from the center to each subscriber using an optical coupler.
しかし、各加入者からセンタへの通信は各加入者の出力
する光信号が混信しないように光結合する必要がある。However, communication from each subscriber to the center must be optically coupled to prevent interference between the optical signals output by each subscriber.
第2図は従来方式の一例のブロック図を示す。 FIG. 2 shows a block diagram of an example of a conventional method.
ここでは各加入者からセンタへの通信についてのみ示し
ている。Here, only communication from each subscriber to the center is shown.
同図中、各加入者10+〜10N夫々では、端子111
〜11N夫々より入来する電気信号を電気/光変換器(
E/O)11+〜IIN夫々で光信号に変換する。各電
気/光変換器11+〜11N夫々は出力する光の波長λ
1〜λNを互いに異ならしめており、これらの出力光は
合波器13で波長多重化された後、光ファイバー14に
よってセンタ15に伝送される。In the figure, each subscriber 10+ to 10N has a terminal 111.
The electric signals coming from each of ~11N are sent to an electric/optical converter (
E/O) 11+ to IIN are converted into optical signals, respectively. Each of the electrical/optical converters 11+ to 11N outputs a wavelength λ of light.
1 to λN are made different from each other, and these output lights are wavelength-multiplexed by a multiplexer 13 and then transmitted to a center 15 by an optical fiber 14.
センタ15では光ファイバー14を伝送された波長多重
光信号を分波器16で各波長λ1〜λNに分離し、分離
された各波長λ1〜λN夫々の光信号は光/N気変換器
(0/E)17+〜17N夫々で電気信号に変換されて
端子181〜18N夫々より出力される。At the center 15, the wavelength-multiplexed optical signal transmitted through the optical fiber 14 is separated into wavelengths λ1 to λN by a demultiplexer 16, and the separated optical signals of each wavelength λ1 to λN are sent to an optical/N air converter (0/N). E) Each of 17+ to 17N is converted into an electric signal and output from terminals 181 to 18N, respectively.
従来方式では波長多重を行なっているため、異なる波長
λ1〜λNの光信号を多重化する合波器13と、各波長
λ1〜λNのノイルタを持つ分波器16とが必要であり
、上記合波器13及び分波器16が高価であり、また、
伝送する光の波長の帯域の制限から多重度Nは3〜4程
度が限界であるという問題があった。Since the conventional method performs wavelength multiplexing, it requires a multiplexer 13 that multiplexes optical signals of different wavelengths λ1 to λN, and a demultiplexer 16 that has a noilter for each wavelength λ1 to λN. The duplexer 13 and the duplexer 16 are expensive, and
There is a problem in that the multiplicity N is limited to about 3 to 4 due to the limitation of the wavelength band of the light to be transmitted.
本発明は上記の点に鑑みなされたもので、システムの価
格を低く抑えることができ、多重度が大幅に向上する光
通信方式を提供することを目的とする。The present invention has been made in view of the above points, and it is an object of the present invention to provide an optical communication system that can keep the cost of the system low and greatly improves the multiplicity.
(課題を解決するための手段)
本発明の光通信方式は、
多地点とセンタとの間で単一の光伝送路を用いて光通信
を行なう光通信方式において、多地点夫々で各被変調信
号の周波数帯域が互いに異なるよう通信用の電気信号を
変調した後、同一波長の光信号に電気/光変換を行なっ
て光伝送路に送出し、
センタで光/電気変換して得られた電気信号を各被変w
4信号に帯域分離し、各被変調信号を復調して多地点夫
々の通信号の電気信号を得る。(Means for Solving the Problems) The optical communication system of the present invention is an optical communication system that performs optical communication between multiple points and a center using a single optical transmission path. After modulating the electrical signals for communication so that the signal frequency bands differ from each other, electrical/optical conversion is performed to optical signals of the same wavelength, which are sent out to the optical transmission line, and the electricity obtained by optical/electrical conversion at the center. Each signal is changed w
The band is separated into four signals, and each modulated signal is demodulated to obtain the electrical signal of the communication signal at each multipoint.
本発明方式においては、多地点夫々の出力する光信号が
同一波長であるため、高価な合波器を用いることなく安
価な光カプラで混合でき、またセンタでは高価な分波器
を用いることなくそのまま光/電気変換することができ
、システムの価格を低く抑えることができる。また多地
点夫々の変調で用いる搬送波周波数を異ならせるだけで
多重度を増大できる。In the method of the present invention, since the optical signals output from each of the multiple points have the same wavelength, they can be mixed using an inexpensive optical coupler without using an expensive multiplexer, and without using an expensive demultiplexer at the center. Optical/electrical conversion can be performed as is, and the cost of the system can be kept low. Further, the multiplicity can be increased simply by changing the carrier wave frequency used for modulation at each multipoint.
第1図は本発明方式の一実施例のブロック図を示す。こ
こでは各加入者からセンタへの通信についてのみを示し
ている。FIG. 1 shows a block diagram of an embodiment of the method of the present invention. Here, only communication from each subscriber to the center is shown.
第1図において、各加入名201〜20N夫々では、端
子211〜21N夫々より入来する電気信号をFM変調
器221〜22N夫々に供給して周波数変調する。FM
変調器(FM)22+〜22N夫々は互いに搬送波周波
数f1〜fNを異ならせており、これらの出力する被F
M変調信号の周波数帯域は異なっている。In FIG. 1, in each of the access terminals 201 to 20N, electrical signals coming from terminals 211 to 21N are supplied to FM modulators 221 to 22N, respectively, for frequency modulation. FM
The modulators (FM) 22+ to 22N have different carrier frequencies f1 to fN, and the output signals of these
The frequency bands of the M modulation signals are different.
上記のFM変調器221〜22N夫々の出力する被FM
変調信号は夫々電気/光変換器(E/O)231〜23
N夫々において光信号に変換される。FM to be output from each of the above FM modulators 221 to 22N
The modulation signals are transmitted through electrical/optical converters (E/O) 231 to 23, respectively.
N signals are converted into optical signals.
電気/光変換器23+〜23N夫々の出力する光の波長
は同一であり、これらの出力光は光カブラ24で混合さ
れた後、光ファイバー25によってセンタ26に伝送さ
れる。The wavelengths of the lights output from each of the electrical/optical converters 23+ to 23N are the same, and after being mixed by the optical coupler 24, the output lights are transmitted to the center 26 by the optical fiber 25.
センタ26では光ファイバー25を伝送された光信号を
光/電気変換器(0/E)27に供給し、ここで電気信
号に変換する。得られた電気信号は帯域フィルタ281
〜28N夫々に供給される。At the center 26, the optical signal transmitted through the optical fiber 25 is supplied to an optical/electrical converter (0/E) 27, where it is converted into an electrical signal. The obtained electrical signal is passed through a bandpass filter 281
~28N respectively.
帯域フィルタ281〜28Nは夫々通過帯域の中心周波
数が周波数f1〜fN夫々に設定されており、加入者毎
の被FM変調信号が分離される。帯域フィルタ28+〜
28N夫々で分離された被EM変調信号はFMIQ調器
(DFM)29+〜29N夫々で元の電気信号に復調さ
れ端子30〜30N夫々から出力される。The center frequencies of the passbands of the bandpass filters 281 to 28N are set to frequencies f1 to fN, respectively, and the FM modulated signals for each subscriber are separated. Bandpass filter 28+~
The EM modulated signals separated by 28N are demodulated into original electrical signals by FMIQ modulators (DFM) 29+ to 29N, and output from terminals 30 to 30N, respectively.
このように電気信号の段階でFM変調することにより各
被FM変調信号の帯域を異ならせ、これを電気/光変換
するため、各光信号の波長は同一であり安価な光カプう
により混合することができる。また伝送された光信号を
高価な分波器で分波する必要もない。In this way, by performing FM modulation at the electrical signal stage, the bands of each FM modulated signal are made different, and in order to perform electrical/optical conversion, each optical signal has the same wavelength and is mixed using an inexpensive optical coupler. be able to. Furthermore, there is no need to separate the transmitted optical signal using an expensive demultiplexer.
また、電気/光変換器231〜23Nは同一構成のもの
を使用でき、その点でも安価になる。Furthermore, the electrical/optical converters 231 to 23N can have the same configuration, which also reduces the cost.
また、各FM変調器の搬送波周波数を異ならせるだけで
伝送する光信号の波長は単一であるため、多重度即ち加
入者数は大幅に増大する。Furthermore, since the wavelength of the optical signal to be transmitted remains the same by simply changing the carrier frequency of each FM modulator, the degree of multiplexing, that is, the number of subscribers, increases significantly.
なお、上記実施例では周波数変調及び復調を行なってい
るが、これは振幅変調及び復調、又は角度変調及び復調
等であっても良く、ただ各被変調信号の帯域が異ならし
めていれば良い。Note that although frequency modulation and demodulation are performed in the above embodiments, this may also be amplitude modulation and demodulation, angle modulation and demodulation, etc., as long as the bands of each modulated signal are different.
上述の如く、本発明の光通信方式によれば、高価な合波
器、分波器が不要で安価な光カブラを用いることができ
システムの価格を低く抑えることができ、多重度即ち加
入者数を大幅に増大でき、実用上きわめて有用である。As described above, according to the optical communication system of the present invention, expensive multiplexers and demultiplexers are unnecessary and inexpensive optical couplers can be used, and the cost of the system can be kept low. The number can be greatly increased, which is extremely useful in practice.
第1図は本発明方式の一実施例のブロック図、第2図は
従来方式の一例のブロック図である。
図において、
20+〜2ONは加入者、
22+〜22NはFM変調器、
231〜23Nは電気/光変換器、
24は光カプラ、
25は光ファイバー
27は光/電気変換器、
281〜28Nは帯域フィルタ、
291〜29Nは「M復調器
を示す。FIG. 1 is a block diagram of an embodiment of the method of the present invention, and FIG. 2 is a block diagram of an example of the conventional method. In the figure, 20+ to 2ON are subscribers, 22+ to 22N are FM modulators, 231 to 23N are electrical/optical converters, 24 is an optical coupler, 25 is an optical fiber 27 is an optical/electrical converter, and 281 to 28N are bandpass filters. , 291-29N indicate "M demodulator.
Claims (1)
で単一の光伝送路(25)を用いて光通信を行なう光通
信方式において、 該多地点(20_1〜20_N)夫々で各被変調信号の
周波数帯域が互いに異なるよう通信用の電気信号を変調
した後、同一波長の光信号に電気/光変換を行なつて該
光伝送路(25)に送出し、該センタ(26)で光/電
気変換して得られた電気信号を各被変調信号に帯域分離
し、該各被変調信号を復調して該多地点(20_1〜2
0_N)夫々の通信号の電気信号を得ることを特徴とす
る光通信方式。[Claims] In an optical communication system that performs optical communication between multiple points (20_1 to 20_N) and a center (26) using a single optical transmission path (25), the multipoints (20_1 to 20_N) ) After modulating an electrical signal for communication so that the frequency bands of each modulated signal are different from each other, electrical/optical conversion is performed to an optical signal of the same wavelength, which is sent to the optical transmission line (25). The electrical signal obtained by optical/electrical conversion at the center (26) is band-separated into each modulated signal, and each modulated signal is demodulated and transmitted to the multiple points (20_1 to 20_1).
0_N) An optical communication system characterized by obtaining electrical signals for each communication signal.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1189210A JPH0353628A (en) | 1989-07-21 | 1989-07-21 | Optical communication system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1189210A JPH0353628A (en) | 1989-07-21 | 1989-07-21 | Optical communication system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH0353628A true JPH0353628A (en) | 1991-03-07 |
Family
ID=16237387
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1189210A Pending JPH0353628A (en) | 1989-07-21 | 1989-07-21 | Optical communication system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0353628A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5450934A (en) * | 1991-11-26 | 1995-09-19 | Luk Lamellen Und Kupplungsbau Gmbh | Friction clutch |
US6000515A (en) * | 1992-07-11 | 1999-12-14 | Luk Lamellen Und Kupplungsbau Gmbh | Clutch assembly |
JP2001336544A (en) * | 2000-03-22 | 2001-12-07 | Aisin Seiki Co Ltd | Friction clutch for vehicle |
KR100552373B1 (en) * | 2001-02-08 | 2006-02-16 | 야마하 가부시키가이샤 | Golf club head made of metal |
JP2007198507A (en) * | 2006-01-26 | 2007-08-09 | Exedy Corp | Clutch cover assembly |
-
1989
- 1989-07-21 JP JP1189210A patent/JPH0353628A/en active Pending
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5450934A (en) * | 1991-11-26 | 1995-09-19 | Luk Lamellen Und Kupplungsbau Gmbh | Friction clutch |
US6000515A (en) * | 1992-07-11 | 1999-12-14 | Luk Lamellen Und Kupplungsbau Gmbh | Clutch assembly |
JP2001336544A (en) * | 2000-03-22 | 2001-12-07 | Aisin Seiki Co Ltd | Friction clutch for vehicle |
KR100552373B1 (en) * | 2001-02-08 | 2006-02-16 | 야마하 가부시키가이샤 | Golf club head made of metal |
JP2007198507A (en) * | 2006-01-26 | 2007-08-09 | Exedy Corp | Clutch cover assembly |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US5107360A (en) | Optical transmission of RF subcarriers in adjacent signal bands | |
JPH04233342A (en) | System and method of optical communication | |
CN102790653B (en) | Reconfigurable optical add-drop multiplexer and reconfigurable optical add-drop multiplexing method | |
US6788899B2 (en) | Dynamic wavelength add/drop multiplexer for UDWDM optical communication system | |
US7376356B2 (en) | Optical data transmission system using sub-band multiplexing | |
CN102088329B (en) | System and method for realizing broadcasting service transmission for wavelength division multiplex passive optical network | |
JPH0353628A (en) | Optical communication system | |
CN1168235C (en) | Method for multiplexing optical marker by co-channel subcarriers | |
US6172790B1 (en) | Electrooptic modulator for frequency translation applications | |
CN110061798A (en) | WDM optical transmission equipment, system and implementation method | |
JPH0474034A (en) | Subcarrier multiplex optical transmission method | |
JP3308148B2 (en) | Optical submarine cable branching device for WDM communication system and WDM optical submarine cable network using the same | |
JP2769502B2 (en) | Multiple information transmission optical network | |
JPH0818538A (en) | Optical wavelength multiplx network system | |
CN216057023U (en) | Four-channel multiple frequency tunable millimeter wave generator based on acousto-optic filter | |
CN114024620B (en) | Double-optical-frequency comb channelized receiver | |
JPS63178632A (en) | Optical transmission equipment for high speed broad band signal | |
JP2826441B2 (en) | Optical network terminal and optical network | |
JPH0923193A (en) | Optical signal transmitter | |
JPH0456829A (en) | Selector | |
JP2001069082A (en) | Optical wavelength multiplex network system | |
JP3535937B2 (en) | Optical transmission system | |
JPH0346842A (en) | Fdm optical transmitter | |
JPH0998137A (en) | Bidirectional optical communication method | |
JP2705632B2 (en) | Optical network communication system |