JPS59172844A - Clock supplying system - Google Patents

Clock supplying system

Info

Publication number
JPS59172844A
JPS59172844A JP58047398A JP4739883A JPS59172844A JP S59172844 A JPS59172844 A JP S59172844A JP 58047398 A JP58047398 A JP 58047398A JP 4739883 A JP4739883 A JP 4739883A JP S59172844 A JPS59172844 A JP S59172844A
Authority
JP
Japan
Prior art keywords
wavelength
clocks
receiving side
signals
different
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
Application number
JP58047398A
Other languages
Japanese (ja)
Inventor
Takayuki Okino
沖野　孝之
Haruo Tsuda
津田　春生
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.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP58047398A priority Critical patent/JPS59172844A/en
Publication of JPS59172844A publication Critical patent/JPS59172844A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0226—Fixed carrier allocation, e.g. according to service
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
    • H04J14/0241—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths
    • H04J14/0242—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON
    • H04J14/0245—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for downstream transmission, e.g. optical line terminal [OLT] to ONU
    • H04J14/0246—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for downstream transmission, e.g. optical line terminal [OLT] to ONU using one wavelength per ONU
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0278—WDM optical network architectures
    • H04J14/0279—WDM point-to-point architectures
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L7/00—Arrangements for synchronising receiver with transmitter
    • H04L7/0008—Synchronisation information channels, e.g. clock distribution lines

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optical Communication System (AREA)

Abstract

PURPOSE:To obtain an inexpensive clock supplying system by converting clocks different in frequency applied with optical wavelength multiplex and transmitted into electric signals at the receiving side, and separating and extracting the signals at filters. CONSTITUTION:The clocks f1-fn having different frequency are inputted respectively to light emitting elements E01-E0n having different wavelengths lambda1-lambdan, and the optical output is transmitted by being wavelength-multiplexed at a wavelength multiplexing circuit MUX. The wavelength multiplex signal is converted into the electric signal by a photodetector 0E at the receiving side and inputted to BPF1-BPFn whose pass band width is set respectively to the f1-fn. Thus, the BPF1-BPFn extract and outputs the clock signals in the frequencies f1- fn respectively, an expensive optical brnaching device is not required and an inexpensive system is constituted.

Description

【発明の詳細な説明】 発明の技術分野 本発明は、クロック供給装置より各端局装置にクロック
を供給するクロック供給方式の改良に関するものである
。DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to an improvement in a clock supply method for supplying a clock from a clock supply device to each terminal device.

従来技術及び問題点 上記の如く端局装置にクロックを供給する場合。Conventional technology and problems When supplying the clock to the terminal equipment as described above.

端局数が増加すれば当然布線量が多くなる。Naturally, as the number of terminal stations increases, the amount of wiring increases.

これを防ぐため、第１図に示す如く光による波長多重を
利用することが考えられた。In order to prevent this, it has been considered to utilize wavelength multiplexing using light as shown in FIG.

つまり９周波数が異なるクロックｆ１　〜ｆいをそれぞ
れ２発光素子Ｅ。ｌ〜Ｅ６％に入力し、駆動する。　発
光素子Ｅ。、〜Ｅ、％は夫々発光波長がλｌ〜λ２と異
なっており、この光出力は、波長多重化回路ＭＵＸによ
り波長多重され、送出される。In other words, clocks f1 to f with 9 different frequencies are connected to two light-emitting elements E, respectively. Input 1 to E6% and drive. Light emitting element E. , ~E,% have different emission wavelengths from λl to λ2, respectively, and their optical outputs are wavelength-multiplexed by a wavelength multiplexing circuit MUX and sent out.

受信側では１分波器ＳＥＰにより、各波長の光を分波し
、受光素子ＯＢ、〜ＯＥ％に入力する。On the receiving side, the light of each wavelength is demultiplexed by a single demultiplexer SEP and inputted to the light receiving elements OB, .about.OE%.

従って、受光素子ＯＥ、〜ＯＥ、からはクロックｆ、〜
ｆ６がそれぞれ出力される。しかしこの構成において１
分波器は非常に高価で１分離数が多くなるとそれが顕著
になり、構成自体も困難となる。Therefore, from the light receiving elements OE, ~OE, the clock f, ~
f6 is output respectively. However, in this configuration 1
A duplexer is very expensive, and as the number of separations increases, this becomes more noticeable, and the configuration itself becomes difficult.

発明の目的 本発明は、この様な欠点を除去することを目的とし、安
価な方式を提供しようとするものである。OBJECTS OF THE INVENTION The present invention aims to eliminate these drawbacks and to provide an inexpensive method.

発明の構成 上記目的は９本発明によれば、複数の周波数の異なるク
ロックをそれぞれ発光波長の異なる発光素子に入力し、
該発光素子出力を波長多重して伝送し、受信側では、電
気信号に変換した後、フィルターにより上記クロックを
それぞれ抽出し、出力する様にしたことを特徴とするク
ロック供給方式によって達成される。According to the present invention, a plurality of clocks having different frequencies are inputted to light emitting elements each having a different emission wavelength,
This is achieved by a clock supply method characterized in that the outputs of the light emitting elements are wavelength-multiplexed and transmitted, and on the receiving side, after being converted into electrical signals, the clocks are extracted by filters and output.

発明の構成 以下本発明を実施例に基づいて説明する。Composition of the invention The present invention will be explained below based on examples.

第２図は３本発明の実施例を示す図で１図中ＯＥは受光
素子ＢＰＦ、〜Ｂ　Ｐ　Ｆ、はバンドパスフィルターで
ある。FIG. 2 is a diagram showing three embodiments of the present invention. In FIG. 1, OE is a light receiving element BPF, and .about.BPF are band pass filters.

本発明において、送信側は従来と同一であるが。In the present invention, the transmitting side is the same as the conventional one.

受信側について、その構成を変更している。The configuration of the receiving side has been changed.

つまり、波長多重信号を受光素子ＯＢにて、−担電気信
号に変換し１通過帯域幅が異なるバンドパスフィルター
ＢＰＦ、〜Ｂ　Ｐ　Ｆ、、に入力する。That is, the wavelength multiplexed signal is converted into a -carrying electric signal by the light receiving element OB, and is input to band pass filters BPF, . . . , which have different passband widths.

バンドパスフィルターＢ　Ｐ　Ｆ、〜Ｂ　Ｐ　Ｆ、は。Bandpass filter B PF, ~B PF, is.

通過帯域幅がｆ、〜ｆ２に設定しである。The passband width is set to f, to f2.

従って、バンドパスフィルターＢＰＦ、−Ｂｌ）Ｆ２に
おいてクロンク信号を抽出し、出力することができる。Therefore, the Cronk signal can be extracted and output in the bandpass filter BPF, -Bl) F2.

発明の効果 以上の如（２本発明によれば、高価な分波器が不要とな
るので、システムを安価にすることができる。Effects of the Invention (2) According to the present invention, an expensive duplexer is not required, so the system can be made inexpensive.

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

第１図は、従来例を示す図、第２図は１本発明の一実施
例を示す図である。 図中ＯＥ、ＯＥ、〜０Ｅ４Ｌ受光素子、ＢＰＦ。FIG. 1 is a diagram showing a conventional example, and FIG. 2 is a diagram showing an embodiment of the present invention. In the figure, OE, OE, ~0E4L light receiving element, BPF.

Claims (1)

【特許請求の範囲】[Claims] 複数の周波数の異なるクロックをそれぞれ発光波長の異
なる発光素子に入力し、該発光素子出力を波長多重して
伝送し、受信側では、電気信号に変換した後、フィルタ
ーにより上記クロックをそれぞれ抽出し、出力する様に
したことを特徴とするクロック供給方式。A plurality of clocks with different frequencies are input to light emitting elements each having a different emission wavelength, the outputs of the light emitting elements are wavelength-multiplexed and transmitted, and on the receiving side, after converting into an electrical signal, each of the clocks is extracted by a filter, A clock supply method characterized by output.
JP58047398A 1983-03-22 1983-03-22 Clock supplying system Pending JPS59172844A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP58047398A JPS59172844A (en) 1983-03-22 1983-03-22 Clock supplying system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP58047398A JPS59172844A (en) 1983-03-22 1983-03-22 Clock supplying system

Publications (1)

Publication Number Publication Date
JPS59172844A true JPS59172844A (en) 1984-09-29

Family

ID=12774005

Family Applications (1)

Application Number Title Priority Date Filing Date
JP58047398A Pending JPS59172844A (en) 1983-03-22 1983-03-22 Clock supplying system

Country Status (1)

Country Link
JP (1) JPS59172844A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0296609A2 (en) * 1987-06-26 1988-12-28 Nec Corporation An apparatus for discriminating an optical signal from others and an apparatus for tuning an optical wavelength filter used in the same
JPH09282043A (en) * 1996-04-18 1997-10-31 Nec Off Syst Ltd Optical clock device
JP2001203636A (en) * 1999-12-11 2001-07-27 Alcatel Synchronous digital communication system
EP1280294A1 (en) * 2000-04-19 2003-01-29 Fujitsu Limited Optical clock signal distribution system in wdm network

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0296609A2 (en) * 1987-06-26 1988-12-28 Nec Corporation An apparatus for discriminating an optical signal from others and an apparatus for tuning an optical wavelength filter used in the same
JPH09282043A (en) * 1996-04-18 1997-10-31 Nec Off Syst Ltd Optical clock device
JP2001203636A (en) * 1999-12-11 2001-07-27 Alcatel Synchronous digital communication system
EP1280294A1 (en) * 2000-04-19 2003-01-29 Fujitsu Limited Optical clock signal distribution system in wdm network
EP1280294A4 (en) * 2000-04-19 2005-06-15 Fujitsu Ltd Optical clock signal distribution system in wdm network
US7024121B2 (en) 2000-04-19 2006-04-04 Fujitsu Limited Optical clock signal distribution system in WDM network

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