WO1985004544A1

WO1985004544A1 - Arrangement for transferring digital data

Info

Publication number: WO1985004544A1
Application number: PCT/DE1985/000091
Authority: WO
Inventors: Peter Joachim Becker; Dirk Heger; Frank Saenger; Peter Peschke; Hermann Bolle; Kym Watson; Walter Heil
Original assignee: Fraunhofer-Gesellschaft Zur Förderung Der Angewand
Priority date: 1984-03-22
Filing date: 1985-03-22
Publication date: 1985-10-10
Also published as: DE3410629A1; EP0176526A1; JPS61501673A

Abstract

Arrangement for transferring digital data between data collectors. The data sources and the data collectors may be for example modular groups in data processing unit, telephone communication systems etc.. The data sources (4) are provided with photo-emitters (2) and the data collectors (5) are provided with photo-receivers (3). Between the photo-emitters and the photo-receivers there is arranged a holographic recording medium (1) wherein are recorded specially produced holograms. The characteristic of said holograms is to open, when lighting the photo-emitters or groups of photo receivers, transfer channels between said photo-emitters and said photo-receivers. In an advantageous developement of the present invention, representation elements are also provided between the photo-emitters and the recording medium, respectively the recording medium and the photo-receivers in order to improve the arrangement efficiency.

Description

Arrangement for the transmission of digital data

TECHNICAL FIELD The invention relates to an arrangement for transmitting digital data between data sources and data sinks.

The data sources and sinks can be, for example, microprocessors, digital memories, input / output devices, but also digital telephone switching systems or other information transmission devices in which data from a multiplicity of data sources are dependent on the respective operating state a large number of data sinks have to be transmitted.

State of the art

According to the prior art, those data sources and data sinks which exchange data with one another in accordance with their function are connected to one another either by individual direct electrical transmission paths (point-to-point connections) via bus systems or crossbar distributors in such a way that at reasonable implementation complexity, the balancing pre-ture of ^'connection network the requested Datendurch¬ set light enables the lowest possible throughput disabilities. With regard to the prior art, reference is made to the following literature references, to which reference is also made with regard to the explanation of terms which are not defined here in detail:

- Peschke, P., Heger, D., Viehweger, W .: "Circuit arrangement for the transmission of digital messages between several data stations"; P 26 44 616.2-31, 1980.

- Wulf, WA, Bell, CG .: "C.mmp - A Multi-Mini-Processor", Proc. AFIPS Fall Joint Computer Conference, Vol. 41, Part II, 1 972, p. 765-777.

- Kober, R .: "Parallel System Structures", Siemens Research and Development Reports Vol. 7, No. 6, 1978, pp. 316-318.

- Dealer, W., Hofmann, F., Schneider, HJ: "A General Purpose Array with a Broad Spectrum of Applications", Computer Science Reports, Vol. 4, Springer-Verlag Berlin-Heidelberg-New York 1975, pp. 311-335.

- Swan, R.J., F ller, S.H., Sieworek, D.P .: "Cm * - A Modular, Multi-Microprocessor", Proc. AFIPS National Computer Conference, Vol. 46, 1977, pp. 637-644.

- Keller, R.M., Lindstrom, G., Patil, S .: "A Loosely-Coupled Applicative Multi-Processing System", Proc. AFIPS National Computer Conference, Vol. 48, 1979, pp. 613-621.

- Denelcor Inc .: "Heterogeneous Element Processor (HEP)

Principles of Operation ", Denver, Colorado, 1979.

- Freundl, M .: "Multiprocessor project MUPSI: Investigation of strategies for the distribution of the user processes on the

Single Processors ", diploma thesis at IMMD IV, University

Erlangen-Nuremberg, 1981.

- Dealer, W., Schreiber, H., Sigmund V .: "Computation Structures Reflected in General Purpose and Special Purpose Multi-Microprocessor Systems", Proc. Int. Conf. on Parallel Processing, Bellaire, Michigan, 1979, pp. 95-102.

- Hockney, R.W., Jesshope, C.R. : Parallel Computers. Adam

Hilger Ltd., Bristol, 1981; Chapter 3.2 "Switching Networks". - Haynes, LS, Lau, RL, Siewiorek, DP, Mizel, DW: "S Survey of Highly Parallel Computing", IEEE Computer, Vol. 15, pp. 9-24, 1982.

- Giloi, W.K. : "Computer Architecture", Heidelberger Taschenbuch Vol. 208, Springer Verlag Berlin-Heidelberg-New York, 1981, chap. 4.8 "Connections of the PEs (processing elements) to a processor array".

All of the above-mentioned proposals have in common that, for reasons of complexity, no connection network is provided which completely networks all data sources with all data sinks. Complete networking is understood here to mean a connection which enables each individual subscriber (data source or data sink) to connect to every other subscriber in accordance with the transmission direction provided for the subscriber, all subscribers to one another can exchange data simultaneously and without mutual interference, provided that the individual subscribers are able to do so due to their technical design.

Especially in the currently discussed computers with parallel

Structure or even in digital telephone switching systems, it would be desirable to establish a complete network between data sources and data sinks.

Presentation of the invention

The invention is based on the object of specifying an arrangement for transmitting digital data between data sources and data sinks which, with justifiable technical outlay, enables complete networking between the data sources and data sinks which, on the basis of their function, can exchange data with one another. This object is according to the invention indicated by the nenden kennzeich¬ in part of the patent claim 1 solves overall _5: According to the invention the transfer of digital data between data sources and data sinks on op¬ tischem ways. For this purpose, the data sources are connected to light transmitters and the data sinks to light receivers. A _holographic storage medium is arranged between the light transmitters and light receivers, which ensures that the light of the light transmitter assigned to a specific data source is mapped onto the light receiver or receivers to be addressed in the respective transmission case. The holograms arranged in the holographic storage medium

, _ thus establish the respectively desired connection between the 15 corresponding light transmitters and the corresponding light receivers without a line connection between the individual elements, for example by means of optical fibers, etc., being necessary.

20th

In other words, the holograms stored in the holographic storage medium act as switching imaging elements, which open the desired transmission channel between the light transmitters and the light receivers and at the same time prevent light ^" from light transmitters from striking light receivers, which result in data not addressed" lower belong.

The structure of the individual stored in the storage medium

_Λ th holograms determines which light emitters are connected to WEL 30 chen light receivers. By deleting the holograms stored in the storage medium or by simply replacing the storage medium with another one

Storage medium with other hologram structures can thus in a simple manner - without, for example, 35

Connections would have to be broken - another link 1 of the data sources are produced with the data sinks.

In the holographic storage medium can be at suffi- o _c chender angle selectivity, ie with sufficient channel separation save between the individual transmission channels up to 10 ^ single holograms "ter optical path Schal¬" 10 * can open communication channels and close. Using these 10 ^ transmission channels, up to _ 10 ⁴ data sources with 10 ⁴ data sinks can be completely networked according to the definition given above, ie the 10 ⁴ data sources can exchange data with all 10 ⁴ data sinks simultaneously and without mutual interference (provided that the individual Data sources and data sinks are able to do this due to their technical design.

A number of surprising advantages are achieved by the holographic storage medium provided according to the invention between light transmitters and light receivers, which establishes the connection:

With sufficient angle selectivity, up to 10 ^ individual holograms can be stored in the holographic storage medium.

The production of the individual holograms in the holographic storage medium, which switch the corresponding light paths for connecting the individual data sources to the data sinks, is very simple. In order to store a hologram that contains one or more specific light transmitters with a connecting one or more specific light receivers, only co-emitting light transmitters have to be arranged at the locations of these light transmitters and light receivers and the wave field of these light transmitters must be recorded in the respective hologram. Of course, the light transmitters used for recording must have a wavelength that drawing process in the storage medium used.

A hologram produced in this way has - as follows directly from the theory of holograms - the property of influencing the wave field of a light transmitter, which is substituted for a "recording light transmitter", in such a way that the wave field emerging from the hologram of the light transmitter is equal to the wave field of the second "recording light transmitter" during the production of the hologram. If one now places a light receiver in the place of the second "recording light transmitter", the wave field of the light transmitter is deflected or diffracted onto the light receiver.

The positioning of the storage medium between the light transmitters and light receivers is comparatively uncritical: a parallel offset of the storage medium to the target position is almost irrelevant; Tilting of the storage medium in relation to the target position, however, must be so small that no crosstalk occurs between adjacent channels. In an extreme case, ie with the complete networking of 10 ⁴ data sources with 10 ⁴ data sinks, in which the maximum angle selectivity of approximately 0.02 ° is used, tilting may only be of this order of magnitude. Become less than 10 Δ *. Networked data sources with less than 10 A ⁴ data sinks or if a number of 10 ⁴ data sources or data sinks does not require complete networking, so that the maximum angle selectivity is not used, correspondingly larger tilting of the storage medium can be permitted.

The arrangement according to the invention for transmitting digital data between data sources and data sinks is thus also suitable for replacing printed circuits in computers etc. with the particular advantage that if the ι

Circuit no new "layout" of the printed circuit is required, but only the storage medium has to be replaced or rewritten.

Further developments., The invention are specified in the subclaims.

At least one hologram is stored for each connection required. If more than one hologram is saved for each required connection, replacement transmission channels can also be implemented, e.g. can be used if certain light transmitters and / or receivers are already occupied by the transmission on other transmission channels.

If all possible transmission channels are to be usable at the same time, it is necessary according to claim 3 to provide a light transmitter for each transmission channel or, in the case of parallel transmission, a group of light transmitters. The number of light transmitters to be provided is thus determined according to the total number of networks, with a complete network of, for example, 100 data sources with 100 data sinks, 10 ⁴ light transmitters and 10 ⁴ light receivers are therefore to be provided for bit serial transmission, for word serial transmission ( Claim 15) accordingly more.

If it is not necessary to realize all possible transmission channels at the same time, ie if the data stations do not have to be completely networked with one another, or if not all data sinks have to exchange information with all data sources, the number of light transmitters and light receivers can be correspondingly be reduced. 1

Options for this are given in claims 4 and 5: According to claim 4, the required transmission channel, i.e. the connection between a specific data source e and a specific data sink is selected by. that a certain pattern lights up from a certain number of light emitters of the data source. The corresponding transmission path is opened by this pattern.

_Q If one selects the pattern according to claim 5 according to a code of equal importance, a particularly simple signal evaluation results on the receiver side, since the signal level always remains the same regardless of the transmission channel used. 5

The arrangement according to the invention not only permits the transfer of data between a respective data source and a data sink. Rather, data can also be transmitted between a data source and a series of data sinks or between a series of data sources and a data sink. Furthermore, it is possible to transmit data from one data source to all data sinks or from all data sources to one data sink (claim 6). The ability of the arrangement according to the invention to transmit data from a data source to a series of data sinks 5 can also be used to reduce the number of holograms required and the number of light transmitters and / or receivers: um nevertheless, to enable a transmission between only one data source and one data sink at a time, a control telegram, which is constructed in a manner known per se, is transmitted optically, that of the large number of data sinks whose light receivers receive data due to the transmission channel opened by means of a specific hologram , communicates which data sink is to be specifically addressed

(Claim 7). 5 1

Another possibility of reducing the number of light transmitters or light receivers required is to provide only as many light transmitters or light receivers as possible,

₅ how the respective data source or data sink must simultaneously transmit or receive data. However, it may be necessary to provide several holograms for a specific transmission channel, ie the connection between a data source and a data sink.

_Q since different light transmitters may have to communicate with different light receivers (claim 9).

Claims 10 to 14 specify various possibilities for arranging the light transmitters and light receivers in such a way that no crosstalk occurs between adjacent transmission channels at high packing density.

It is particularly advantageous if either the light transmitters and / or the light receivers are arranged in a cell or on one or more concentric circles, since such an arrangement largely suppresses crosstalk between adjacent channels, which is otherwise due to the three-dimensional height ¬ logram structure, which acts as a three-dimensional diffraction grating, as well as the occurrence of higher orders.

Due to the arrangement of optical imaging systems, such as lenses, etc., as claimed in claim 16, the light yield on the receivers, i.e. the efficiency of the transmission can be further increased.

In principle, any holograms can be used for the arrangement according to the invention. However, the use of volume holograms is particularly advantageous, since volume holograms have a particularly high angle selectivity. 1 which can reach the order of magnitude of 1/100 ° when using light sources with a large coherence length, such as gas lasers etc. (Claim 17).

5

When using volume holograms can according to claim

18 any photochromic or photorefractive materials such as lithium niobate, lithium tantalate, photoacrylic or dichromate gelatin can be used.

10

Incoherently radiating light sources, for example light-emitting diodes, can be used as the light transmitter. With such light-emitting diodes, transmission rates of up to 100 Mbit / s can be achieved without further notice. However, higher transmission rates, for example 300 Mbit / s, can be achieved, for example, by using laser diodes such as pictail diodes (claim 20) as the light transmitter.

To reduce the radiating or receiving area of the light transmitters or light receivers, optical fiber bundles, for example glass fibers etc., can be used by means of. whose light is directed from the light transmitter with a larger cross-sectional area to the actual exit point or vice versa from the receiving location to the license

_? 5 receivers with a larger cross-sectional area.

In the claims 22 to 24 possibilities are given how a complete networking of units, which can be both data sources and data sinks, can be produced by means of the arrangement according to the invention.

Brief description of the drawing

The invention is described in more detail below on the basis of exemplary embodiments with reference to the drawing, in which: 1 shows a first embodiment of an arrangement according to the invention,

2 shows a second exemplary embodiment of an arrangement according to the invention, and

3 shows an exemplary embodiment in which the number of light receivers and light transmitters required is reduced.

Ways of Carrying Out the Invention

1 shows a first exemplary embodiment of the invention, which has a volume holographic system consisting of a storage medium 1, a transmitter matrix 2 and a receiver line 3 for connecting a large number of data sources 4 to data sinks 5.

A large number of holograms are stored in the storage medium 1, each of which diffracts the light coming from a specific light transmitter from the transmitter matrix 2 in such a way that it strikes a light receiver in the receiver row 3. This property of the individual holograms is achieved by arranging two "recording light transmitters" at the location of the light transmitter in the transmitter matrix 2 or at the location of the (desired) light receiver in the receiver line 3, and the (coherent) wave field originating from these “recording light transmitters” is recorded in the storage medium 1. The hologram thus generated then has the property of diffracting the light emanating from a light transmitter in the transmitter matrix 2 in such a way that a wave field is created on the "receiver line side" side of the storage medium, the structure of which corresponds to the structure used for the production of the hologram used wave field coincides, in other words the hologram diffracts the light of the light transmitter onto the corresponding one Light receiver.

The arrangement shown in FIG. 1 thus enables a large number of data sources 4 and data sinks 5 to be connected with holographically optical means in such a way that digital data can be transmitted simultaneously and without collision from the data sources to the data sinks.

The arrangement shown in Fig. 1 can be improved with respect to its optical efficiency by insertion of optical imaging systems, between the ^'sender matrix 2 and the storage medium 1 and between the storage medium 1 and the receiver line 3.

In the exemplary embodiment shown, the holographic system contains a hologram for each required connection between a data source and a data sink. The transmitter matrix 2 contains as many light transmitters for each data source 4 as data sinks 5 are to be directly addressed by a data source. The receiver line 3 contains for each data sink as many light receivers as data sources which can address the respective data sink directly.

The matrix-like arrangement of the light transmitters and the cell-shaped arrangement of the light receivers are causally related to the optical properties of the volume holograms provided here. This not only suppresses higher diffraction orders, but also crosstalk, which would result from the three-dimensional hologram structure and thus the three-dimensional diffraction behavior. Likewise, the light transmitters can of course also be arranged in a cell shape and the light receivers in a matrix shape or light transmitters and light receivers in a cell shape. In addition, the light transmitter and / or. Light receiver also attached to a circle or several concentric circles be classified. The latter arrangement has the advantage that crosstalk is very well suppressed due to higher diffraction orders.

In holographic systems with other optical properties, the light transmitters and the light receivers can also be of the same type, e.g. preferably arranged in a matrix.

Volume holograms have the property that the angular selectivity between adjacent channels is approximately 0.01 °. Since typical storage media for volume holograms are lithium niobate crystals with edge lengths in the order of magnitude of several millimeters, up to 10 ° holograms can be saved with an angular separation that is sufficient for “typical geometries” and used for channel selection. This means that as many connections can be used at the same time.

The connections can either be bit serial or word serial. In word-serial execution is for everyone

Bit of a digital word on the transmitter matrix 2

Light transmitter, a light receiver on the receiver line 3 and a hologram in the holographic system for each combination between data sources and data sinks.

In addition to address pairs for data sources and data sinks, other combinations can also be defined using a hologram, e.g. group addressing of several data sinks by any data source or collective addressing of all data sinks by any data source are possible. It is important, however, that the total number that can be stored with sufficient efficiency

Holograms are not exceeded for the proposed Q

Volume holograms are at least 10 °. To mini 1 sation and optimal geometric shape of the Sen¬ the matrix 2 and the receiver 3 can ngerzeile * beispiels¬ as parent fiber optic bundles are used, in each of which ₅ light transmitter and the light receiver a Lichtwel¬ used lenleiter. This means that any geometric adaptation of the holographic system to the downstream data sources and data sinks can be carried out.

10

This way you can now get up to a very large number of

Data sinks and data sources either a completely networked connection network or also connection networks with other addressing patterns can be produced.

15

2 shows a further exemplary embodiment of an arrangement according to the invention, which contains components 24, which can be both data sources and data sinks. One can imagine these components as digital processors, digital memories, digital computers consisting of digital processors and digital memories or input / output elements. In the following, these components 24 are referred to as data components. These data components may e.g. have to solve a common data processing task. To do this, they have to match each other according to the needs of

__5 common data processing task exchange data.

The data components 24 are connected both to a transmitter matrix 24 and to a receiver matrix 29. The light coming from the transmitters of the transmitter matrix 22 is from

30 holograms in a first storage medium 21 are deflected onto a receiver line 23. The receiver line 23 is connected via an electrical transmission link 25 to transmitter modules 27 which control a transmitter line 26.

The light emanating from the transmitters of the transmitter line 26 is applied to the holograms 35 in a second storage medium 28 1

Controlled receiver of the receiver matrix 29.

The arrangement according to FIG. 2 works as follows: ₅ In the case of data transmission, the address of a channel to be controlled is set on the transmitter matrix 22, for example, by a certain light spot pattern lighting up. A channel consists of a receiver which is arranged in the receiver line 23, and the light signal into an - electric signal converting _n, which is applied via the downstream transmission path 25 to the electrical transmitter module 27th The transmitter module 27 contains control electronics which, on the basis of control telegrams received via the electrical transmission link 25

, _ Transmitter line 26 by channel, the destination address of the data sink ^'24 15 adjust permitted. The arrangement contains several channels of the same type, so that other channels of the arrangement can be used depending on channel assignments for data transmission or on inoperable channels. 0

The data exchange can be done in this arrangement

The system corresponding to the arrangement can be switched on in that the first data component willing to send communicates its wish for data transfer with the aid of a first collective telegram (telegrams to all other data sources). This first collective telegram has one

Control tasks and contains the information about which of the channels 23, 25, 27 available in a limited number

Transfer take place and what data component 24 (as

Data sink) should be addressed. With the help of this first 0

Collective telegram is on the one hand all possible

Data sources are informed of the occupancy of a specific channel. If other data sources in turn want to transmit data, they initiate their transmission process in the same way and choose a channel that is not currently occupied. On the other hand, with the help of the first 1

Collective telegram on the transmitter line 26 of the corresponding occupied channel set the address of the data sink 24 (destination address). The data source then transmits the

₅ Useful information about the transmission path now set up. After the user transmission has been completed, the data source sends out a second collective telegram as a control telegram, in which the previously occupied channel is identified. All possible data sources receive this second collection _n telegram and thus get the message that this

Channel is now free again for further use. In this way, all possible data sources are informed about the current occupancy of the channels and can thus occupy free channels. The second collection

, _ legram also means that with a new first group telegram 15 a new destination address can be set on the transmitter line 26 for the next transmission. If several data sinks now want to occupy a straight free channel at the same time, a collision of the document requests occurs. This

_Λ is based on the well-known CSMA / CD method (carrier sense 20 multiple access / collision detection) or a similar one

Access control methods - as known for manifold systems - dissolved (Heger, D .: for classification, theoretical description and evaluation of local data manifolds, dissertation at the University of Karlsruhe, 1983; Ό

Progress reports of the VDI journals, row 10, no.24, 1983). Here too, as with the arrangement described first, the light transmitters 22, 26 and light receivers 23, 29 can be arranged in a similar manner, for example preferably in a matrix, that optical imaging systems can be used in the first and second holographic systems to improve the efficiency, that the Ver ¬ Binding can be either bit-serial or word-serial, that groups and group addresses can be defined 35 in each holographic storage medium 21, 28 and that, for example, ordered light wave 1 bundle of conductors can be used to geometrically adapt the first and second holographic systems.

₅ The idea of the second arrangement according to the invention is that complete logical networking between a large number of data sources and data sinks is established over a selectable number of physical channels, that the transmission between the data sources and the. Channels are carried out by a first holographic system and the transmission between channels and data sinks is carried out via a second holographic system, and that the selection, assignment and release of the channels is carried out using a protocol by means of control telegrams or methods, such as

. _ They are known for channel allocation in local networks 15.

FIG. 3 shows a modification of the exemplary embodiments shown in FIGS. 1 and 2, in which a "multiple bus system" is used. The holograms stored in the storage medium which is not shown in detail in FIG. 3 influence the light emitted by light transmitters of the assemblies T1-T18 in such a way that it is deflected onto the light receivers of several assemblies. This is due to the punk

__ te symbolized at the intersections of lines A1 - A18 with lines b1, 25 c1, d1, e1, f1 - a18 ... e18. For example, the light coming from the light transmitter of module T1 is received by the light receivers of modules T1, T5, T8, T, T12 and T18. An optically transmitted control telegram or transmission protocol is used to select the one to which the data transmission is directed, for example the T5 module. The further structure of the exemplary embodiment shown in FIG. 3 can be the same as in the examples shown in FIG. 1 or 2. 5

Of course, this idea can also be le transmission etc. ^' in which several light transmitters and receivers form a transmission channel.

The invention has been described above on the basis of exemplary embodiments without restricting the general inventive concept in accordance with which specially produced holograms are used to network data transmitters or to data sources with data sinks or data receivers.

Claims

Patent claims

1. Arrangement for transmitting digital data between data sources and data sinks, characterized in that the data sources (4) light transmitter (2) and the data sinks (5) have light receivers (3), and that between the light transmitters (2) and the light receivers A holographic storage medium (1) is preferably arranged (3), in which holograms are stored, which open transmission channels between these light transmitters and light receivers freely selectable by the structure of the holograms when light transmitters or groups of light transmitters are illuminated.

2. Arrangement according to claim 1, characterized in that at least one hologram is stored in the storage medium (1) for each connection required between the data sources (4) and the data sinks (5).

3. Arrangement according to claim 1 or 2, characterized in that each data source (4) for each data sink (5) to which data should be transmitted, has a light transmitter (2) or a group of light transmitters.

4. Arrangement according to claim 1 or 2, characterized in that the transmission channel required in each case can be selected from a group of light transmitters by illuminating part of the light transmitter.

5. Arrangement according to claim 4, characterized in that the selection of the illuminating part of the light emitter follows er¬ a balanced code.

6. Arrangement according to one of claims 1 to 5, characterized in that holograms are stored in the holographic storage medium 5 (1). each open a transmission channel for the transmission of data to groups of data sinks and / or all data sinks.

7. Arrangement according to claim 6,

_1Q characterized in that when data is transmitted to a group of data sinks, a specific data sink can be selected by an optimally transmitted control telegram constructed in a manner known per se.

, _

8. Arrangement according to one of claims 1 to 7, 15 characterized in that each data sink (5) has as many light receivers (3) as data sources (4) to this data sink (5) can transmit data.

9. Arrangement according to one of claims 1 to 7, characterized in that each data sink (5) has as many light receivers (3) as data sources (4) can simultaneously transmit data to this data sink (5).

10. Arrangement according to one of claims 1 to 9,

_a5 characterized in that the light transmitter (2) and the light receiver (3) are arranged in a matrix.

11. Arrangement according to one of claims 1 to 9, characterized in that the light transmitter and / or the light receiver are arranged on a circle or more concentric circles.

12. Arrangement according to one of claims 1 to 9, characterized in that the light transmitter (2) matrix-shaped and 35 mig and the light receiver (3) are arranged in a cell.

13. Arrangement according to one of claims 1 to 9, characterized in that the light transmitters (2) are row-shaped and the light receivers (3) are arranged in a matrix.

14. Arrangement according to one of claims 1 to 9, characterized in that the light transmitter (2) and the light receiver (3) are arranged in a cell.

15. Arrangement according to one of claims 1 to 11, characterized in that the data transmission between data sources (4) and data sinks (5) takes place bit or word series.

16. The arrangement according to one of claims 1 to 12, characterized in that optical imaging systems between light transmitter (2) and storage medium (1) and / or between storage medium (1) and light receiver (3) are used.

1 7. Arrangement according to one of claims 1 to 13, characterized in that the storage medium stores the stored holograms as volume holograms.

18. The arrangement according to claim 17, characterized in that a photochromic or photorefractive material is used for the storage medium.

19. Arrangement according to one of claims 1 to 18, characterized in that the light transmitters are laser diodes.

20. The arrangement according to claim 19, characterized in that the laser diodes are pictail diodes.

21. Arrangement according to one of claims 1 to 20, characterized in that the light transmitter (2) and the ₅ light receivers (3) have optical fiber bundles.

22. Arrangement according to one of claims 1 to 21, characterized in that a complete logical networking between data sources (4) and data sinks (5) is established over _n a selectable number of optical over-channels, the connection between the data sources and the Channels through a first holographic system and the connection between the channels and the data sinks via a second holographic system. 5

23. Arrangement according to one of claims 1 to 22, characterized in that the destination address of the data sink (24) via control electronics, which is contained in the transmitter module (27), and via a control telegram, via the electrical transmission path (25) of the Channel is received, can be controlled on the arrangement of the light transmitter (26) is set.

24. Arrangement according to one of claims 1 to 23, characterized in that the selection of assignments and releases of the channels are carried out via a protocol by means of control telegrams or via methods of channel allocation known per se.

0

5