DE4101962A1 - Data transmission system with optical fibre(s) - connects both ends of fibres fitted in separate plug housing to electro-optical transducer - Google Patents

Abstract

In the data transmission system, both ends of the optical fibre(s) (1a,b) are each inserted in separate plug housing (2,3), each with an electro-optical transducer (2a,b;3a,b) for the fibre connection. From each plug housing electric contacts (4a-c;5a-c) of the transducer are brought out. Pref. the optical fibre is formed by a glass fibre line typically of a monomode, gradient, or step index type. An additional metal line (1c,d) of copper or silver may be used in parallel with the optical fibres. Typically all optical fibres and metal lines are inserted at one end into a common plug housing (2), and/or at their other ends into a second common plug housing (3). ADVANTAGE - Improved protection against impurities. High data transmission rate.

Description

The invention relates to an arrangement for the transmission of Data with at least one optical fiber according to Oberbe handle of claim 1. Such an arrangement is for example from the technical article by C. Kittel: "Der new Intercity Express is controlled by fiber optic cable ", in: ntz 43 (1990) Issue 8, pp. 607-608 already known.

Arrangements of this kind are increasingly used if there are several modules or devices within a system need to be connected. Which is due to the Benefits of using optical fibers how

• - Security against earth loops
• - electrical isolation
• - Security against radiation and radiation (EMV Festig speed)
• - low cable weight

are generally known.

Usually, however, the system parts must be releasable to be connected. For this purpose, optical plug-in ties required. A disadvantage of this connector but is their susceptibility to pollution, so that this in rough industrial or military conditions are less suitable.

Connections of this type are known as RS232 connectors cable and are generally suitable for low data tenrates, with Pla Stic fibers are used (see e.g. product name Description of the GO232 optical data transmission module Greenwich Instruments in: ntz Vol. 43 (1990) Issue 8, P. 621).

The object of the invention is an arrangement of the type mentioned at the beginning to create the one as possible has low susceptibility to pollution and the a transfer of the data with the highest possible Da enables tenrate.

The achievement of the object is in Pa Claim 1 described. The sub-claims included advantageous training and further developments of the invention.  

In a special embodiment of the invention is before seen that the two ends of at least one light waveguide each lead into a separate connector housing and there (in the housing) each with an electro-optical Converters (light transmitter and light receiver) are connected and that each of these transducers has one or more elec trical contacts out of the respective connector housing are led.

In contrast to the known An, the invention enables orders a data transmission with high bit rates (up to several gigabit / s) or a transmission of high frequency Analog data (up to a few GHz and more), whereby as Transmission medium advantageously fiber optic lines such as B. single mode, gradient or step index fibers for Come into play.

The fact that in the invention of the or the electroopti transducers (e.g. light emitting diodes) into the corresponding corresponding housing of the plug connection are integrated falls an optical connector, so that only electri contacts are to be made. Such connectors are commercially available for all conceivable applications (cf. e.g. the optical data transmission mentioned above module GO232 from Greenwich Instruments). In particular especially when using multiple plug connections the solution according to the invention can be used advantageously the, with the connecting cable between the plant len advantageous as a multiple cable both fiber optic as well as copper or silver wires (e.g. for electricity supplier gung) may contain. In addition, the  Operating voltage for the electro-optical converters if supplied via this multiple connector. As Connectors are mostly high quality waterproof Plug connections (e.g. watertight circular plugs) are used, so that the arrangement without difficulty even outdoors or can be used in dirty rooms.

Should signals with higher data rates or high frequency Analog signals are transmitted as are light transmitters Semiconductor laser recommended. These components need another circuit to stabilize the Laserdi current. This circuit can, for example, with in one of the connector housings can be integrated, or Be part of the devices to be connected.

The invention is explained in more detail below with reference to the figures. The figures each show a block diagram of a data transmission system with an advantageous embodiment of the arrangement according to the invention with semiconductor lasers, the stabilization electronics required for the semiconductor lasers once inside one of the plug housings of the arrangement according to the invention ( FIG. 1) and once in one of the devices ( FIG. 2 ) is housed.

In particular, in the transmission system in Fig. 1, a multiple cable 1 with optical fibers such. B. glass fibers 1 a and 1 b and with metallic lines such. B. Kup feradern 1 c and 1 d provided at both ends in a for the lines 1 a - 1 d common connector housing 2 or 3 , in which on the one hand the ends of the glass fibers 1 a, 1 b each with a electro-optical converters (semiconductor lasers) 2 a, 2 b or 3 a, 3 b are connected and, on the other hand, electrical contacts 4 a- 4 c or 5 a- of the electro-optical converters 2 a, 2 b or 3 a, 3 b 5 c are led out of the connector housing 2 and 3 , while the two copper wires 1 c and 1 d pass through the two housings 2 and 3 and are also formed at their ends as electrical contacts. The electrical contacts 4 a- 4 c, 1 c, 1 d and 5 a- 5 c, 1 c, 1 d of the two connector housings 2 and 3 are each 6 and 7 connections with multiple devices with two devices 8 and 9 connected, between which the data are to be transmitted via the arrangement according to the invention.

The electronics 10 (circuitry) required for the stabilization of the laser diode current is accommodated in this system, for example, in connector housing 2 .

The transmission system in FIG. 2 differs from the system described above in FIG. 1 only in that the stabilizing electronics 10 are accommodated here in the device 8 in a playful manner, with the result that a further electrical contact 4 d from the plug housing 2 is led out and connects the stabilizing electronics 10 in Ge device 8 with the electro-optical converters via a further plug connection.

In this transmission system, for example in Ge device 8 (analog or digital) data are generated which are supplied as electrical signals via the multiple connector 6 to the electro-optical converters 2 a, 2 b in the connector housing 2 and converted into light signals there, which in turn are transmitted The optical waveguides 1 a and 1 b are supplied to the electro-optical converters 3 a and 3 b in the connector housing 3 , where they are converted back into electrical signals and are fed to the device 9 via the multiple connector 7 there. In parallel, further data from device 8 are fed to device 9 via the two copper wires 1 c and 1 d.

It goes without saying that the transmission can also take place in the same way from device 9 to device 8 , or that the one transmission channel a ( 4 a, 2 a, 1 a, 3 a, 5 a) for data transmission (analog or digital) from device 8 to device 9 is used and the other transmission channel b ( 4 b, 2 b, 1 b, 3 b, 5 b) for data transmission (analog or digital) in the opposite direction from device 9 and device 8 (or vice versa) Transmission channel a for data transmission from device 9 and device 8 and transmission channel b for data transmission from device 8 and device 9 ).

Claims (9)

1. Arrangement for the transmission of data with at least one optical fiber, characterized in that the two ends of the at least one optical fiber ( 1 a, 1 b) each in a separate connector housing ( 2 , 3 ) and in the connector housing ( 2 , 3 ) are each connected to an electro-optical converter ( 2 a, 2 b; 3 a, 3 b) and that each of the electro-optical converters ( 2 a, 2 b; 3 a, 3 b) has one or more electrical contacts ( 4 a - 4 c or 4 a- 4 d; 5 a- 5 c or 5 a- 5 d) are led out of the respective connector housing ( 2 ; 3 ). 2. Arrangement according to claim 1, characterized in that the at least one optical waveguide ( 1 a, 1 b) is designed as a glass fiber line, preferably as a single mode or gradient fiber or step index fiber. 3. Arrangement according to one of claims 1 or 2, characterized in that parallel to the at least one optical waveguide or to the at least one fiber optic line ( 1 a, 1 b) additionally at least one metallic line ( 1 c, 1 d), preferably made of copper or silver is seen before. 4. Arrangement according to one of claims 1 to 3, characterized in that all optical fibers or glass fiber lines ( 1 a, 1 b) and / or metallic lines ( 1 c, 1 d) with their one ends in a first common connector housing ( 2 ) and / or with their other ends open into a second common connector housing ( 3 ), from which all the electrical contacts ( 4 a- 4 c or 4 a- 4 d; 5 a- 5 c or 5 a- 5 d) the electro-optical converter ( 2 a, 2 b; 3 a, 3 b) or the respective end of the additional at least one metallic line ( 1 c, 1 d) are led out. 5. Arrangement according to one of claims 1 to 4, characterized in that at least the majority of Lichtwel lenleiter or glass fiber lines ( 1 a, 1 b) and / or the metallic lines ( 1 c, 1 d) to a common multiple cable ( 1 ) are summarized. 6. Arrangement according to one of claims 1 to 5, characterized in that the connector housing ( 2 , 3 ) are each designed as a circular connector, preferably as a waterproof circular connector. 7. Arrangement according to one of claims 1 to 6, characterized in that the electro-optical converters ( 2 a, 2 b; 3 a, 3 b) are each designed as light-emitting diodes. 8. Arrangement according to one of claims 1 to 6, characterized in that the electro-optical converter ( 2 a, 2 b; 3 a, 3 b) are each designed as a semiconductor laser. 9. Arrangement according to claim 8, characterized in that for the semiconductor laser ( 2 a, 2 b; 3 a 3 b) is provided stabilization electronics ( 10 ) and this stabilization electronics ( 10 ) either in one of the connector housings ( 2 ) or outside of the connector housing ( 2 , 3 ).