MXPA97008708A - Satellite of communications of high capaci - Google Patents

Abstract

A high-capacity communication satellite uses a large number of parallel beams and an optical processing to make a completely switched, high-bandwidth, fully-bandwidth, fully-switched communications system. The satellite reuses its assigned bandwidth into each of the multiple beams. The beams are formed either by optical or RF means. The specific users in each beam are then separated optically using spatial light modulation (SLM) installation correlation techniques. A single large SLM can be used, or multiple smaller SLMs can be used in combination. The individual clients are repositioned in the installation by mixing and mapping SLMoptics. The result is then remodulated by another SLM facility used as a mixer, and then recombined to re-form the appropriate output beams. The entire system then becomes a high-bandwidth, fully-switched, high-capacity channel communications network in a single satellite.

Description

HIGH-CAPACITY COMMUNICATIONS SATELLITE Background of the Invention Field of the Invention The present invention relates to communication satellites and, in particular, to the provision of a fully-interactive, fully-switched, high-capacity, high-capacity communication network. bandwidth in a single satellite. The inventive system is a high capacity communications satellite, or HCCS. DESCRIPTION OF THE RELATED TECHNIQUE Satellites have been used for communication for years. A common use of satellites involves distributed transmission, such as the C-band Telesat and, Ku, direct-transmission satellites that have one or two beams. These satellites, which are in geosynchronous orbit (that is, their orbital velocity and altitude are such that they seem to oscillate on a particular position on the surface of the earth), transmit a series of simultaneous "programs" in a direction toward a planet. number of individual land stations. These are not point-to-point OR interactive (two-way) satellites. However, they must have a definitely broad bandwidth (typically 100-500 MHz). Another use for communication satellites is a so-called point-to-point type of pass, in which a receiving beam is aimed at a large sending disk (eg, in Europe) and a corresponding transmitting beam is aimed at a reception disk in the United States (for example, Intelsat). This system is also geosynchronous and broadband (100-500 MHz), but has a limited number of beams (for example, eight beams would be a large number for such a system). Also, these systems cover only limited areas, allow only limited switching, if any, and handle very few communication channels. Some newer system designs (Iridium, Ellipsat, Calling Communications) involve a large number (66 to 840) low-orbit satellites that pass messages together to create a fully interactive network. These are very complex, expensive systems, limited to a low bandwidth ("10 KHz or less) and a low capacity (50-200 channels in the total system). Typical satellite communication systems have been limited to a low bandwidth (for example, 50-500 MHz would only handle 50-500 channels); Switching networks, which use standard video switching capable of inclusion in a satellite, would only handle 10-100 switched channels. Even the current national telephone system only handles audio, which has a much lower bandwidth ("10 KHz), to switch approximately one million customers simultaneously. The terrestrial telephone system contains 10,000-20,000 switching constructions, at a cost of over $ 100 billion. It would be desirable to provide a satellite system having a large number of channels and a high bandwidth, while providing an interactive, fully switched system. Although space-light modulating technology (SLM) is known based on optics and can be used for airborne transmission, as is evident for example in copending application No. 08 / 133,879, filed in the name of the present inventor , the application of SLM technology to provide high capacity satellite communications has not been known, as far as the present inventor is aware. SUMMARY OF THE INVENTION It is an object of the present invention to create a communications satellite that does not suffer from the above disadvantages. It is a specific object of the invention to provide a system combining a large number of multiple antenna beams and a novel optical processing and switching system using SLM technology.

By using a large number of parallel beams (100 to 4,000) and optical processing based on a spatial light modulator (SLM) to distinguish the clients within each beam (100 to 1,000 clients / beam) and by moving the clients Individuals towards the appropriate output beam and output frequency, the present invention allows the simultaneous switching of up to one million simultaneous 1 MHz (full video) signals, thus producing a fully interactive video network. The bandwidth achieved by the invention is 100 times the bandwidth of expensive low Earth orbit systems, and manages five to 20 times the number of simultaneous clients on a single satellite, in contrast to the 66 to 840 satellites currently required. As a result, the inventive system is relatively low in costs. The SLMs and the beamforming devices are integrated circuits, individual, definitely economic, that allow the reduction in satellite weight to be less than half of that of the current satellite designs. The HCCS system uses from 100-4,000 simultaneous beams (being the baseline design of 1,000). Since it is possible to reuse the full spectrum in each beam if the beams are appropriately coded, it is possible to manage 500 clients per beam (1 MHz / channel in a total bandwidth of 500 MHz), allowing total simultaneous use by approximately 1 million customers The remaining problem is how to commute the 500,000 output channels. As mentioned above, the current telephone system requires 10,000-20,000 constructions to switch the same number of audio channels of much lower bandwidth; In addition, the HCCS system must switch the same number of video channels of much larger bandwidth (1 MHz) within a definitely small satellite. Recent developments in the SLM that uses technology of quantum origin have created the capacity of installations of 1024 x 1024 pixels that can be driven at speeds of 1 GHz from a total reflectance to almost zero reflectance (over 40 dB of dynamic range). Although facilities of this size would allow a complete implementation of the invention, and would be a preferred embodiment, as a practical problem at present only smaller SLMs are available in the amounts and costs necessary. Within the contemplation of the invention is the use of a larger number of smaller SLMs (perhaps two, four, eight or 16 or more as desired or necessary) in combination to provide performance comparable to that achieved by the SLMs bigger.

According to a preferred embodiment of the inventive switching technique, the 500 channels are first coded per beam either by frequency assignment or by wide band coding. Then, an SLM installation of 1024 x 1024 (made of either a single SLM or multiple smaller SLMs) mixes the incoming frequencies from the frequencies assigned to the baseband where they are detected and pass through the band. Alternatively, in the case coded by broadband, the decoding signals are multiplied by the input and integrated to separate the 500 channels per beam. Once separated and detected, they are remodulated by another set of SLMs either to move them to the appropriate beam or to create the appropriate amplitude bandwidth per output beam to retransmit the information. The entire system takes approximately seven to 10 SLM installations of 1024 x 1024, a few detector installations, and a few linear installations (1024 x 1) with appropriate optics. Additional optics to redirect a portion of each beam back to its same area can also be added to handle the larger volume of local calls, expected. It is also within the contemplation of the invention to add special circuitry as necessary to separate some channels later into over 100 audio channels, or to combine a number of channels for a high definition television (HDTV) transmission. BRIEF DESCRIPTION OF THE DRAWINGS The features and advantages of the present invention will become more apparent from the detailed description set forth below when taken in conjunction with the drawings in which like reference characters are corresponding throughout and where : Figure 1 is a general view of one embodiment of the invention used as a single communications satellite system. Figures 2A to 2C are more detailed views of a series of techniques for creating a multi-beam antenna design according to the invention. Figure 3 is a more detailed view of the structure for carrying out optical processing in the first embodiment of the invention. Figures 4A and 4B describe a mechanism for retransmitting a portion of the bandwidth of each beam back to the same area. Figure 5 describes an alternative mode that uses digital coding instead of frequency coding. Figure 6 is a detailed description of an "arbitrary" crossover bus switching implementation according to a second embodiment of the invention. DETAILED DESCRIPTION OF THE PREFERRED MODALITIES Figure 1 illustrates a high capacity communications satellite system according to the present invention, in which N beams 2 are shown, with M simultaneous clients 1 per beam. These M customers would be only a small fraction of the total customers in the beam. However, since only about 1% of customers use a two-way communication system at a time, these simultaneous users could represent as many as 100 x M potential clients or terminals, each having a small antenna, a transceiver, and a video camera and TV player. The M simultaneous users (where M is from 100 to 4,000; typically 500) would have some low level of near-lossless video compression to compress each signal to a 1 MHz band (or digital equivalent), for a total of 500 signals in a typical implementation. These 500 signals, each having a 1 MHz bandwidth, either encoded by frequency or digitally encoded to discriminate between them.

The signals are received by one of the N parallel receive beams 3 (typically N = 1000) created by the multi-beam antenna receiving system in a geosynchronous satellite (not shown). In the satellite, the 1000 beams 3 (each containing 500 simultaneous users) are transmitted along N channels 4 to a multi-beam former 5, using a 1 x N SLM illuminated by a laser to form M optical channels 6. Each optical channel 6 is then diffused in one dimension using a divergent cylindrical lens to illuminate an SLM installation of N x M in an individual channel resolution device 7. The SLM installation of N x M is driven by sinusoidal signals appropriate in its later plane in order to subvert the desired individual channels to video. After an appropriate detection and filtering, each channel of each beam is decoded effectively and its signal is isolated in a pixel of the N x M detector installation, producing optical channels of N x M 8. A crossbar switch Cash 9 is then applied to switch any individual channel to any desired output location. In its simplest form, this would be done by encoding the signal at its origin, on the ground to ensure that once detected, it will be in the desired column to be sent to the desired reception location. This would not require any "intelligence" from the satellite and no change in the operation of the satellite. In a slightly more complex implementation, a "double jump" capability would be added, in which the ground transceivers in the selected (or all) beams could receive a signal and redirect it to the desired endpoints. This allows alternative addressing when needed. In a more general mode, the selected pixels would be "remodulated" with arbitrary frequencies (or codes), repeating the process of downconversion and detection in any plane. The signal at any pixel could be moved to any other pixel to allow a completely random crossbar coupling. Once the signals have been coded and detected, they are used to modulate another SLM of N x M to create optical signal paths N x M. These are then provided to an individual channel modulator 11, which includes another SLM of N x M whose backplane contains appropriate code or sinusoidal modulation to "fill" the bandwidth of the retransmitted beams. The signals emitted over the optical channels of N x M 12 are then provided to a beam combiner 13, which includes a 1 × N detector array and cylindrical optics, which produce N optical channels 14. Next, a beam former is used. multiple beams 15 to create the appropriate signals 16 in order to create in turn the N retransmitted beams 17 which are coaxial with the N beams received. These beams (typically 1000) contain the 500 channels that complete each one the crossing link of the simultaneous communication, of complete video, of a million clients. An additional path is created from the multi-beam former 5 by subdividing K direct channels 18. These are made more easily if the channels are frequency coded by a simple filter 19, such as a direct return filter, in each beam. The filtered channels are added along the K direct channels 20 to the multi-beam former 15 to allow a large number of local video connections within each local beam. Figures 2A-2C show different methods for creating "multiple antenna beams". Figure 2A shows a curved multi-feed standard reflector design, commonly called a multi-beam Gregoriana feed antenna. In that antenna, a series of real RF feeds 21 are located in the focal plane of a curved reflector 22 in order to create a series of beams 23 that would cover a large area (such as the United States). Figure 2B shows a Luneburg RF lens, a technique that uses a dielectric sphere 24 that has a variable dielectric constant as a function of radius in order to focus any parallel beam towards a point on the far side of the sphere. If M feeds were located in the appropriate places 25, M beams 23 covering the desired area would be created. The two previous techniques are well known to those technicians of ordinary experience in this technical field and do not need to be detailed here. However, these techniques tend to be difficult when used in a satellite system. In Figure 2C a more efficient volume design is shown, which shows a Luneburg optical lens approach, in which M input beams 26 are sampled by a multi-element RF installation 27 of appropriate number and element space for create M beams, whose elements are connected in a pixel to the mode of the installation element in an SLM of N x M 29. Before being issued to SLM 29, the output of installation 27 is subconverted from RF to a baseband in the subverter 28. A laser 30 illuminates the SJM 29 through appropriate cylindrical optics 31 and a mirror half 32, and the output beam is focused on the appropriate M detectors that use a variable dielectric sphere 33 to sample the M beams. M feeds 34 (which can be diode lasers) are placed to create the output beams. As can be appreciated, the embodiment of Figure 2C would be quite smaller than those of Figures 2A or 2B. Figure 3 describes the internal processing of the output 6 of the input beamformer 5 (N optical channels), through the input 14 of the output beamformer 15 (N optical channels) as shown in Figure 1. Referring to FIG. 3, the signals of the input beamformer 5 are constituted by N antenna beam signals in separate signal paths. (typically 1000 trajectories) each containing M simultaneous signals coded by frequency or digital (typically M = 500). These signal paths are connected to an SLM installation of 1 x N 101. The installation is illuminated by a laser 105 through a collimation lens 104 and a mirror half 103, the output of the laser 105 focusing to the installation of line 101 by a cylindrical lens 102. The lens 102 also diffuses each reflected signal by combined beam to cover a complete row of another SLM 106 installation. This installation has each column wired as a whole and modulated by the same signal within the resolution device of individual channel 107. The first column is modulated by a frequency fa, the second by a frequency 2fx, the third by a frequency 3f ?, etc., until the last column is modulated by a frequency Mfi. In this way, the beam containing all the frequencies of fi a Mfi are then multiplied by the reflectance of each pixel that is also modulated by fa to Mf: according to its position in the row. (The above procedure actually takes place in in-phase (I) and quadrature (Q) stages to cover both dimensions.) In this way, the frequency is effectively "moved" in such a way that the desired channel Move or subvert to video. The signal installation then jumps out of the mirror half 103 and is focused by the collimating lens 108 on the detector / accumulator 109. This method effectively detects the signal and filters the desired signal for each pixel by low pass. The detector / accumulator installation 109 is connected on a pixel by pixel basis to another SLM 110 installation which is illuminated by the laser 113 through collimation lenses 112 and mirror half 11. At this point, each individual channel is has completely detected and its signal has been located in one of the N x M pixels of the installation of SLM 110. The image is then reflected outside the installation of SLM 114 that "remodulates" the individual signals to "fill" the beams of exit.

At this point, the N input beams are still diffused through the rows where beam 1 is row 1, beam 2 is row 2, etc. The columns now represent the individual clients within the beam, column 1 represents customer 1, column 2 represents customer 2, etc. The individual channel modulator SLM 115, which is in this mode identical to the installation of SJM 106 but rotated by 90 °, takes this demodulated installation and remodulates the signal corresponding to client 1, beam 1 at the frequency fx; client 1, beam 2 at frequency 2f ?, etc. As with the installation of SLM 106, the procedure is carried out in in-phase (I) and quadrature (Q) stages. Then, after the signals are reflected out of the mirror half 111, they are compressed by cylindrical lenses 116 into a single pixel which becomes the output beam 1. Each beam would be compressed in this way, and the beams they would be emitted through the 1 x N 117 detector facility towards the N antenna feeds 118. This is possible since the remodulation has the effect of modulating each "client 1" with a different frequency, allowing the receiving clients to differentiate their respective calls. In this way, each J client from all N beams is remodulated in order to separate into frequency and combine optically to create a new output beam J. For 1000 simultaneous clients per beam, and 1000 beams, this finished mode describe would allow a client of each beam to call the clients in each of the other beams. Although the capacity of the system would obviously be quite large (1 million simultaneous video circuits), it would not match the use of well-known typical communication. This is because typically a large number of calls are local and not local calls, and tend to cluster in high density areas (eg, New York City, Washington D.C.). One technique for alleviating the call density problem would be to place repeaters in a large number of suspicious sub-used regions. These repeaters could use the K beam as an intermediate scale between the original point and the desired destination. Although this approach could use some capacity of area K served by the beam K, it would also provide significant flexibility to the system. Figures 4A and 4B describe two mechanisms for increasing the available number of local calls (i.e., within the beam) by dedicating frequencies fi to f as "local" calls. This can be done on a beam-by-beam basis by direct filtration - a technique that will be described in relation to Figure 4A - or by filtering all fi af signals after they have been filtered separately - a technique that it will be described with reference to Figure 4B. Figure 4A describes an electronic solution (filtering by filter of the signal), while Figure 4B describes an optical solution, which involves an optical alteration of the installation of N x M 115 to carry out a derivation of the bandwidth partial. In Figure 4A, an input signal 200 is divided into two signals by the divider 201. One of the signals continues to the SLM facility of 1 x N 101 for processing as described above. The other channel is filtered in the band pass filter 202 and is directly combined with the output signal coming from the 1 x N 117 detection facility. These signals are summed in a totalizer 203 to provide a summed signal, which it is used to direct the output beam 204 corresponding to the same input beam. Figure 4B describes an optical solution to the same problem. The signal that comes through the mirror half 11 is partially interrupted by a full mirror 205 oriented at 45 °, which is reflected outside the vertical mirror 206 and another 45 ° mirror 207 to reflect what is in the region aa the region b. Note that region b is rotated 90 ° with respect to region a. After appropriate modulation, the output beam contains frequencies fi a f k that are identical to the frequencies f a a f k sent in the same beam. Figure 5 describes an alternative modality that replaces the downconversion SLM 106 and the remodulation SLM 115 with digital code multiplication. The nomenclature used in this figure indicates that different codes can be used in communication in both directions. As shown, the frequency fi is replaced with the code k + 1, the frequency f2 is replaced with the code k + 2, and so on for the down-conversion process, and the frequency fi is replaced with the code 3, the frequency f2 is replaced with code 2, and so on for the remodulation process. The reflective signal is then integrated to decode the desired signals. This technique will allow many more channels to be contained in a given bandwidth, as is conventional in multiple code access (CDMA) systems. The simplest mode, even with the internal beam repeaters and the Partial Bandwidth Derivation to increase the available local calls, would have difficulty handling a large number of calls between two separate beams. The use of the repeater technique uses an additional channel per extra call.

In this way, for example, 10 calls between Haz 10 (Los Angeles) and Haz 342 (Washington, D.C.) would take 19 channels in total. A completely arbitrary crossbar switch, a mode of which is shown in Figure 6, would handle that problem easily. The implementation of the completely arbitrary crossbar switch of Figure 6 includes the entire structure of Figure 3, but adds optical elements between the SLM installation of N x M 110 and an additional detector / accumulator 109 and an installation of SLM 110 The first detector / accumulator 109 and the installation of SLM 110 identify each customer input per column and each beam per row. The optical signal outside the SLM 110 is separated by a mirror half 300 through the mirror half 301, and is focused by the lens 302 towards an arbitrary modulating SLM installation of N x M 303 (arbitrary modulator # 1). This installation 303 is a complex installation of N x M that allows any frequency fi -Mfi module any pixel in the installation of N x M. With the arbitrary modulator # 1 each pixel can be multiplied by an arbitrary Kfa that can be different for each pixel The arbitrarily reflected modulated signal of each installation 303 is then focused on a line by the first cylindrical lens 304 and diffused by the second cylindrical lens 304 through the mirror half 305 to another SLM 306 facility that subverts each pixel to its position of fi - Mfi. The image emitted by the installation 306 is then reflected by the mirror half 305 through the mirror half 307 towards a second SLM installation of arbitrary modulator of N x M 308 (arbitrary modulator # 2) which multiplies each pixel by an arbitrary value Lfi that is different for each pixel. The output of the SLM 308 installation is reflected out of the mirror half 307 and passes through cylindrical lenses, first and second, 309, 309, similarly to the management of the output of the SLM 303 facility. In this way, each pixel is subverted to its position fx to fN on the installation of SLM 311. The first installation of SLM 306 effectively moves the signal in the plane # 1 - the second installation of SLM 311 effectively moves the signal in plane # 2, which is orthogonal to plane # 1. The signal is then redetected (as is done by a detector / accumulator 109) and used to modulate another SLM installation (like the installation of SLM 110) and it is combined with the original signal coming from the SLM 110 installation. In this way, any signal coming from any beam can be moved to be like any other signal coming from any other beam, producing a great amount of more flexibility. Although the invention has been described in detail with respect to preferred embodiments, various changes and modifications within the scope and spirit of the invention will be apparent to those experienced in the work of this technological field. In this way, the invention should only be considered limited by the scope of the appended claims.

Claims (31)

1. NOVELTY OF THE INVENTION Having described the present invention, it is considered as a novelty and therefore the property described in the following claims is claimed as property. 1. A two-way communication system using only one satellite, said system comprises: receiving means for receiving a first set of N beams, each serving said first set of N beams to M clients simultaneously, where N and M are integers; optical channel forming means for forming a first set of N optical channels from said respective N beams; diffusion means for diffusing each of said first set of N optical channels in one dimension to irradiate a first N x M installation; switching means for switching an existing signal at a position of the first installation of N x M to any position of a second installation of N x M; non-diffusion means for forming said second N x M installation in a second set of N optical channels; beamforming means for transforming the second set of N optical channels from said non-diffusion means into a second set of N beams; and transmission means for transmitting the second set of N beams from said beamforming means, each of said second set of N beams serving M clients simultaneously. The system according to claim 1, characterized in that said optical channel forming means includes a first spatial light modulator of 1 × N. 3. The system according to claim 1, characterized in that said diffusion means includes a divergent cylindrical lens. The system according to claim 1, characterized in that said switching means comprise: channel resolution means for receiving the outputs of said diffusion means in N x M channels; a crossover switch for receiving the outputs of said channel resolution means and decoding and isolating the N x M channels; and channel modulation means for receiving the outputs of said crossover switch and recoding the N x M channels for subsequent compression and conversion by said non-diffusion means and said beam-forming means. The system according to claim 4, characterized in that said channel resolution means comprise: a first spatial light modulating installation of N x M, which receives the outputs of said diffusion means; a first laser beam source means for irradiating said first spatial light modulator installation of N x M with a first laser beam; and a first mirror half that is illuminated by said first laser beam. The system according to claim 4, characterized in that said crossbar switch comprises: an N x M detector / accumulator for receiving the outputs of said channel resolution means and providing N x M outputs on the isolated channels; and a second spatial light modulator installation of N x M having N x M elements to receive any of the N x M outputs of said detector / accumulator of N x M through any of the N x M elements and emit them to through any other of the N x M elements. The system according to claim 4, characterized in that said channel modulation means comprise: a third installation of spatial light modulator of N x M, which receives the outputs of said cross-bar switch; second laser beam source means for irradiating said third spatial light modulator installation of N x M with a second laser beam; and a second mirror half that is illuminated by said second laser beam. The system according to claim 1, characterized in that said means of non-diffusion include a cylindrical converging lens. 9. The system according to claim 1, characterized in that said beam-forming means includes a second spatial light modulator of 1 x N. 10. The system according to claim 1, characterized in that it also includes at least one terrestrial base transmitter, said at least one terrestrial base transmitter means for the frequency coding signals of said M clients served by each of said N beams in order to distinguish one of said signals which belong to a particular one of said M clients of other said signals of said M clients, wherein said diffusion means diffuse said signals coming from said M clients along separate optical paths to provide N x M signals coded by frequency . The system according to claim 10, characterized in that said crossover switch comprises: a first spatial light modulator installation of N x M to receive and decode the N x M frequency encoded signals from said diffusion means for provide N x M signals encoded according to the decoding frequencies provided in said first installation of spatial light modulator; and a first N x M detector facility for receiving said N x M decoded signals and separating said N x M decoded signals into N x M respective channels. The system according to claim 11, characterized in that said cross-bar switch further comprises: a second spatial light modulator installation of N x M to receive said N x M decoded signals in said respective N x M channels and transmit said N x M signals encoded in any other of said N x M respective channels; and a third spatial light modulator installation of N x M to modulate by frequency and recode said N x M decoded signals according to coding frequencies provided in said third spatial light modulator installation. The system according to claim 1, characterized in that it also includes at least one terrestrial base transmitter, said at least one terrestrial base transmitter means for digitally encoding the signals of said M clients served by each of said N beams in order to distinguish them from said signals belonging to a particular one of said M clients of others of said signals belonging to other M said clients. The system according to claim 13, characterized in that said crossbar switch comprises: a first spatial light modulator installation of N x M to receive and decode the N x M digitally encoded signals from said diffusion means to provide N x M decoded signals according to the decoding information provided in said first installation of spatial light modulator; and a first N x M detector facility for receiving said N x M decoded signals and isolating said N x M decoded signals in N x M respective channels. The system according to claim 14, characterized in that said crossover switch further comprises: a second spatial light modulator installation of N x M to receive said N x M decoded signals in said respective N x M channels and transmit said N x M decoded signals in any other said N x M respective channels; and a third spatial light modulator installation of N x M to modulate and recode said N x M decoded signals according to the digital coding information provided in said third spatial light modulator installation. The system according to claim 1, characterized in that N is approximately 1000. 17. The system according to claim 1, characterized in that M is approximately 500. 18. The system according to claim 10, characterized in that said switching means comprise: first installation of a spatial light modulator of N x M to receive and decode the N x M signals from said diffusion means to provide N x M decoded signals according to the decoding information provided in said first installation of spatial light modulator; a first N x M detector facility for receiving said N x M decoded signals and isolating said N x M decoded signals in a first set of N x M respective channels; a second installation of a spatial light modulator for receiving said N x M decoded signals in said N x M respective channels and transmitting said N x M decoded signals in any other of said first set of N x M respective channels; a third installation of spatial light modulator of N x M to modulate said N x M decoded signals as N x M individual pixels; a fourth installation of a spatial light modulator for moving said N x M individual pixels along a first plane; a fifth installation of spatial light modulator of N x M to further modulate said N x M individual pixels to provide N x M additionally modified pixels; a sixth installation of a spatial light modulator of N x M to move said modified N x M pixels further along a second plane, orthogonal to said first plane, to provide N x M displaced modified pixels; a second N x M detector facility for receiving said N x M displaced modified pixels from said sixth installation of a N x M spatial light modulator and detecting and isolating said N x M modified pixels displaced in an additional set of N x M respective channels; a seventh installation of a spatial light modulator of N x M to receive said additional set of N x M respective channels and transmit any of said additional set of N x M respective channels along any other of said additional set of N x M respective channels; and an eighth installation of a spatial light modulator of N x M to modulate and recode the decoded signals in said additional set of N x M respective channels, received from said seventh installation of a spatial light modulator of N x M, according to with the coding information provided in said eighth installation of spatial light modulator. The system according to claim 1, characterized in that it also includes means for redirecting signals, transmitting from a first origin to a first « destination along a particular channel that is selected according to a predetermined coding scheme, through at least one intermediate destination / origin pair in the case that said particular channel is occupied. The system according to claim 5, characterized in that said first installation of spatial light modulator of N x M comprises a single spatial light modulator of N x M. The system according to claim 5, characterized in that said first installation of The spatial light modulator of N x M comprises a plurality of spatial light modulators. 22. The system according to claim 6, characterized in that said second installation of spatial light modulator of N x M comprises a single spatial light modulator of N x M. 23. The system according to claim 6, characterized in that said second installation of The spatial light modulator of N x M comprises a plurality of spatial light modulators. The system according to claim 7, characterized in that said third installation of spatial light modulator of N x M comprises a single spatial light modulator of N x M. 25. The system according to claim 7, characterized in that said third installation of spatial light modulator of N x M comprises a plurality of spatial light modulators. 26. The system according to claim 12, characterized in that each of said first to third spatial light modulator facilities of N x M comprises a single spatial light modulator of N x M. 27. The system according to claim 12, characterized because each of said first to third spatial light modulator facilities of N x M comprises a plurality of spatial light modulators. The system according to claim 15, characterized in that each of said first to third spatial light modulator installations of N x M comprises a single spatial light modulator of N x M. 29. The system according to claim 15, characterized because each of said first to third spatial light modulator facilities of N x M comprises a plurality of spatial light modulators. The system according to claim 18, characterized in that each of said first to eighth spatial light modulator facilities of N x M comprises a single spatial light modulator of N x M. 31. The system according to claim 18, characterized because each of said first to eighth spatial light modulator facilities of N x M comprises a plurality of spatial light modulators.