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WO1999008404A1 - Dispositif pour le transfert de signaux optiques avec fonction de circuit de remplacement - Google Patents

Dispositif pour le transfert de signaux optiques avec fonction de circuit de remplacement Download PDF

Info

Publication number
WO1999008404A1
WO1999008404A1 PCT/DE1998/000768 DE9800768W WO9908404A1 WO 1999008404 A1 WO1999008404 A1 WO 1999008404A1 DE 9800768 W DE9800768 W DE 9800768W WO 9908404 A1 WO9908404 A1 WO 9908404A1
Authority
WO
WIPO (PCT)
Prior art keywords
transmission line
replacement
main transmission
receiver
optical signals
Prior art date
Application number
PCT/DE1998/000768
Other languages
German (de)
English (en)
Inventor
Ernst Kremers
Friedrich-Christian Tischer
Original Assignee
Robert Bosch Gmbh
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 Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Priority to EP98925393A priority Critical patent/EP1002384A1/fr
Priority to BR9812121-9A priority patent/BR9812121A/pt
Publication of WO1999008404A1 publication Critical patent/WO1999008404A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/03—Arrangements for fault recovery
    • H04B10/032—Arrangements for fault recovery using working and protection systems

Definitions

  • the invention relates to an arrangement for transmitting optical signals in an optical network with a transmission path connected between at least one transmitter and at least one receiver.
  • optical networks consisting of optical waveguides are permanently installed for the transmission of optical signals and are coupled at their end points to at least one receiver and at least one transmitter.
  • parallel transmission lines or alternative transmission lines are routed on alternative routes. These automatically take over the transmission of the optical signals if the main transmission line is mechanically damaged, for example due to earthworks.
  • the optical signals are simultaneously fed into both the main transmission lines and the spare transmission lines.
  • a switchover arrangement is to be provided on the receiving side, which is controlled by a signal detection device. If the signal detection device detects that the transmission of optical signals is interrupted via the main transmission line, a command is sent to the switchover arrangement, which then switches over the transmission to the replacement transmission line. It is disadvantageous here that the signal detection and switching arrangements can only be implemented with a relatively high outlay, and the switching, at least temporarily, results in interference in the transmission of the optical signals.
  • the arrangement according to the invention with the features mentioned in claim 1 offers the advantage that switching between the main transmission line and the replacement transmission line is possible in a simple manner without an additional signal detection device and switching arrangement. Because the main transmission line and the replacement transmission line are designed in such a way that a reception level of the optical signals supplied by the main transmission line is definedly higher than one The reception level of the optical signals supplied by the replacement transmission line can be detected by an automatic level control which is already integrated in the receiver for other reasons, and the failure of reception via the main transmission line can be recognized and automatically switched to receiving the optical signals via the replacement transmission line.
  • the optical signals of both paths reach the receiver with different levels when the main transmission lines are intact, but only the optical signal of this path is evaluated by the higher level via the main transmission line . Only when the optical signals with the high reception level fail does the automatic level control detect the identical optical signals with the low level, so that the transmission of the optical signals is not interrupted.
  • the switchover is thus very advantageously carried out without additional measures and devices solely through the defined different levels of both paths in cooperation with the automatic level control of the receiver.
  • the defined level difference of the optical signals in the main transmission line and the replacement transmission line is by a route of the replacement transmission line in a detour between the transmitter and the receiver by itself, since then the replacement transmission line has a defined higher attenuation for the optical signals.
  • the optical signals are transmitted via the main transmission line and the replacement transmission line with a defined different attenuation.
  • a defined level difference between the optical signals in the main transmission line and the replacement transmission line can be achieved in a simple manner by means of a passive optical element, which is in any case present for the division of the optical signal between the main transmission line and the replacement transmission line, or by an additional attenuator respectively.
  • an optical transmission link 10 for transmitting optical signals from a transmitter 12 to a receiver 14 is shown as part of an optical network. For reasons of clarity, only one transmitter 12 and only one receiver 14 are shown. It is of course possible to use the arrangement according to the invention also in optical networks which have a multiplicity of transmitters 12 and receivers 14, the transmitters 12 and the receivers 14 each being able to be arranged at two ends of the optical network.
  • the optical transmission link 10 comprises a main transmission line 16 and a replacement transmission line 18.
  • the main transmission line 16 and the replacement transmission line 18 are each formed by optical fibers, for example glass fibers, by means of which optical signals can be transmitted.
  • the transmitter 12 is connected to the main transmission line 16 and the alternative transmission line 18 via a coupler 20.
  • the coupler 20 is designed, for example, as a symmetrical coupler that has a nominal attenuation of 3 dB per output.
  • the optical signals sent by the transmitter 12 are fed into the main transmission line 16 and the equivalent transmission line 18 with the same amplitude.
  • the main transmission line 16 and the replacement transmission line 18 are connected to a further coupler 22, the output of which is connected to the receiver 14.
  • the coupler 22 also has, for example, a nominal attenuation of 3 dB per input. The transmission of the optical signals between the transmitter 12 and the receiver 14 thus takes place exclusively via passive optical components.
  • the transmission link 10 is operated such that the optical signals received by the receiver 14 via the main transmission line 16 are received with a defined higher reception level than the optical signals received via the replacement transmission line 18.
  • This can be achieved, for example, by interposing a level adjuster 24 or 26 as shown in dashed lines in the main transmission line 16 and the replacement transmission line 18.
  • the level of the optical signal is influenced by the level adjusters 24 and 26 in such a way that there is a defined level difference between the optical signals received simultaneously by the receiver 14 via the coupler 22 via the main transmission line 16 and the replacement transmission line 18.
  • the level difference to be set must be at least as large as the signal-to-noise ratio required by the optical signal to be transmitted.
  • the level- The difference is, for example, 15 dB, which is generally sufficient as a signal-to-noise ratio in the known digital transmission of optical signals.
  • the receiver 14 has an automatic level control 28, which automatically adjusts the reception to the optical signal with the higher level.
  • the optical signal sent by the transmitter 12 is thus received via the main transmission line 16, since this delivers a defined higher reception level than the optical signal sent via the substitute transmission line 18.
  • the main transmission line 16 is interrupted, for example mechanically by civil engineering work, the optical signal at the receiver 14 is no longer present with the defined higher reception level over the main transmission path, but with the lower reception level over the replacement transmission line 18.
  • the automatic. Level control 28 thus receives the same optical signal without interruption, only with a low reception level.
  • the level of the optical signal sent via the replacement transmission line 18 is correspondingly amplified via the control circuit integrated in the receiver and further processed in the receiver 14.
  • the dynamic range of the receiver 18 is designed such that, based on the gain setting at a normal reception level of the optical signal via the main transmission line 16, there is an amplification reserve which is at least as large as the level difference between the reception levels of the optical signals via the Main transmission line 16 and the Substitute transmission line 18. This ensures that the optical signal sent with the low reception level is received via the substitute transmission line 18 in the event of an interruption in the main transmission line immediately, that is, without significant interference and without further switchovers from the receiver 14. In this case, the takeover is automatically carried out automatically, so that the receiver 14 has no knowledge of the interruption of the main transmission line 16.
  • the level adjuster 24 and 26 it can be provided to design the coupler 20 and / or the coupler 22 asymmetrically, that is to say the attenuation of the optical signals from the transmitter 12 to the main transmission line 16 on the one hand and the attenuation of the optical signals from the transmitter 12 on the other hand is set differently on the receiver 14. In this way, a defined level difference in the reception level of the optical signals is achieved, so that the already explained further reception of the optical signals can take place via the substitute transmission line 18 when the main transmission line 16 is interrupted.
  • the replacement transmission line 18 in such a way that the optical signal is attenuated in accordance with the longer path length over a correspondingly longer path length of the replacement line compared to the path length of the main transmission line 16. This results in a level difference between the reception levels of the optical signals of the main transmission line 16 and the replacement transmission line 18.

Landscapes

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

Abstract

L'invention concerne un dispositif servant au transfert de signaux optiques, comportant une voie de transmission montée entre au moins un émetteur et au moins un récepteur, cette voie de transmission comprenant une ligne de transmission principale et une ligne de transmission de remplacement qui, en cas de défaillance de la ligne de transmission principale, prend automatiquement en charge la transmission des signaux optiques, et lesdits signaux optiques étant simultanément injectés dans la ligne de transmission principale et dans la ligne de transmission de remplacement. Selon l'invention, il est prévu que la ligne de transmission principale (16) et la ligne de transmission de remplacement (18) soient conçues de façon telle qu'un signal optique injecté arrive, lorsqu'il est transmis par l'intermédiaire de la ligne de transmission principale (16), au récepteur avec un niveau plus élevé de façon définie que lorsqu'il est transmis par l'intermédiaire de la ligne de transmission de remplacement (18), une prise en charge du signal optique au niveau du récepteur (14) étant commandée par un dispositif de régulation de niveau (28) automatique du récepteur (14).
PCT/DE1998/000768 1997-08-08 1998-03-14 Dispositif pour le transfert de signaux optiques avec fonction de circuit de remplacement WO1999008404A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP98925393A EP1002384A1 (fr) 1997-08-08 1998-03-14 Dispositif pour le transfert de signaux optiques avec fonction de circuit de remplacement
BR9812121-9A BR9812121A (pt) 1997-08-08 1998-03-14 Disposição para a transmissão de sinais ópticos com efeito comutador substituto

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19734311.2 1997-08-08
DE1997134311 DE19734311A1 (de) 1997-08-08 1997-08-08 Anordnung zur Übertragung optischer Signale mit Ersatzschaltungswirkung

Publications (1)

Publication Number Publication Date
WO1999008404A1 true WO1999008404A1 (fr) 1999-02-18

Family

ID=7838341

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1998/000768 WO1999008404A1 (fr) 1997-08-08 1998-03-14 Dispositif pour le transfert de signaux optiques avec fonction de circuit de remplacement

Country Status (4)

Country Link
EP (1) EP1002384A1 (fr)
BR (1) BR9812121A (fr)
DE (1) DE19734311A1 (fr)
WO (1) WO1999008404A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103986514A (zh) * 2014-05-29 2014-08-13 国家电网公司 一种通信网络装置和系统
US11261191B2 (en) 2006-11-22 2022-03-01 Incyte Holdings Corporation Imidazotriaines and imidazopyrimidines as kinase inhibitors

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07509376A (ja) * 1991-08-20 1995-10-19 シュウォーツ　ジャック 多層マットレス
NL1016955C2 (nl) * 2000-12-21 2002-06-28 Telfort B V Netwerkverbinding met automatische dubbele routering.

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59169238A (ja) * 1983-03-16 1984-09-25 Mitsubishi Electric Corp 光伝送装置
EP0617525A1 (fr) * 1992-10-13 1994-09-28 The Furukawa Electric Co., Ltd. Systeme de commutation de trajectoire lumineuse

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59169238A (ja) * 1983-03-16 1984-09-25 Mitsubishi Electric Corp 光伝送装置
EP0617525A1 (fr) * 1992-10-13 1994-09-28 The Furukawa Electric Co., Ltd. Systeme de commutation de trajectoire lumineuse

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 009, no. 023 (E - 293) 30 January 1985 (1985-01-30) *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11261191B2 (en) 2006-11-22 2022-03-01 Incyte Holdings Corporation Imidazotriaines and imidazopyrimidines as kinase inhibitors
CN103986514A (zh) * 2014-05-29 2014-08-13 国家电网公司 一种通信网络装置和系统
CN103986514B (zh) * 2014-05-29 2016-08-24 国家电网公司 一种通信网络装置和系统

Also Published As

Publication number Publication date
DE19734311A1 (de) 1999-02-11
BR9812121A (pt) 2000-07-18
EP1002384A1 (fr) 2000-05-24

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