JP2022165539A - Optical communication device, optical space communication system, optical communication method, and optical communication program - Google Patents

Abstract

To make soundness confirmation of an optical communication device to be mounted on a satellite be executable even with the device alone.SOLUTION: An optical communication device comprises: optical transmission means for transmitting a first optical signal for a downlink modulated using a first electric signal to a space and transmitting a second optical signal for self inspection modulated using a second electric signal to a self inspection optical dedicated line; optical reception means for demodulating a third optical signal for an uplink propagated in the space to a third electric signal and demodulating the second optical signal propagated in the self inspection optical dedicated line to a fourth electric signal; and data processing means for outputting the first electric signal to the optical transmission means, outputting the second electric signal to the optical transmission means, processing the third electric signal input from the optical transmission means, and verifying soundness of the fourth electric signal input from the optical transmission means.SELECTED DRAWING: Figure 2

Description

The present invention relates to self-verification technology for optical communication devices and the like.

In recent years, with the development of broadband satellite communication services such as high-throughput satellites, there is an increasing need for large-capacity satellite communication. Expectations are rising for optical space communication technology between the ground and satellites as a technology to satisfy these needs.

In addition, with the increase in capacity of satellite communications, there are increasing opportunities for incorporating new technologies and parts for general purposes other than aerospace into optical communication devices mounted on satellites. General purpose parts are available at a lower cost and introduce new technology earlier, but are less reliable than aerospace parts. Therefore, it is necessary to verify the normality of optical communication devices on orbit. In satellite communications, it is also necessary to evaluate the quality of optical signals propagating in the atmosphere between the ground and the satellite.

An example of optical space communication technology between the ground and a satellite is disclosed in Patent Document 1. The optical receiver described in Patent Literature 1 is used in a space environment for mounting on a satellite.

WO2020/110956

2. Description of the Related Art In general technology for a space-based optical communication system between a ground station and a satellite, an uplink optical signal transmitted from an optical communication device for a ground station is propagated and received by an optical communication device for on-board a satellite. Also, a downlink optical signal transmitted from the satellite-mounted optical communication device is propagated and received by the ground station optical communication device. Therefore, it is necessary to prepare an optical communication device for the ground station in order to confirm the soundness (normality verification) of the optical communication device to be mounted on the satellite. Similarly, in checking the soundness of an optical communication device between satellites, it is necessary to prepare an optical communication device to be mounted on another opposing satellite. Here, the optical receiver described in Patent Document 1 does not have a function of independently confirming the soundness of the optical receiver. Therefore, the satellite-mounted optical communication device, such as the optical receiver described in Patent Literature 1, has a problem that the soundness confirmation of the satellite-mounted optical communication device cannot be performed by itself.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and its main object is to make it possible to check the soundness of a satellite-mounted optical communication device by itself.

In one aspect of the present invention, an optical communication apparatus transmits into space a first optical signal for downlink modulated using a first electrical signal, and a second optical signal for self-verification modulated using a second electrical signal. 2 optical transmission means for transmitting the optical signal to the self-verification optical dedicated line; and demodulating the third optical signal for uplink propagating in the space into a third electrical signal, and the third optical signal propagating through the self-verification optical dedicated line. an optical receiving means for demodulating two optical signals into a fourth electrical signal; outputting the first electrical signal to the optical transmitting means and outputting the second electrical signal to the optical transmitting means; and data processing means for processing the electrical signal and verifying normality of the fourth electrical signal input from the optical receiving means.

In one aspect of the present invention, a free space optical communication system transmits into space a first downlink optical signal modulated using a first electrical signal, and a self-verification optical signal modulated using a second electrical signal. Optical transmission means for transmitting the second optical signal to the self-verification optical dedicated line, demodulating the third optical signal for uplink propagating in space into a third electrical signal, and propagating the self-verification optical dedicated line optical receiving means for demodulating the second optical signal into a fourth electrical signal; outputting the first electrical signal to the optical transmitting means and outputting the second electrical signal to the optical transmitting means; 3. An optical communication device that processes an electrical signal and includes data processing means for verifying the normality of a fourth electrical signal input from an optical receiving means; 3 Includes optical communication equipment for ground stations that transmits optical signals into space.

In one aspect of the present invention, an optical communication method includes transmitting into space a first optical signal for downlink modulated using a first electrical signal and a second optical signal for self-verification modulated using a second electrical signal. Optical transmission processing for transmitting two optical signals to the dedicated self-verification optical line, demodulation of the third optical signal for uplink propagating in the space into a third electrical signal, and third electrical signal propagating on the dedicated self-verification optical line Optical reception processing for demodulating the second optical signal into a fourth electrical signal, outputting the first electrical signal, outputting the second electrical signal, processing the third electrical signal, and normality of the fourth electrical signal perform data processing and verification.

In one aspect of the present invention, an optical communication program causes a computer to transmit a first optical signal for downlink modulated using a first electrical signal into space, and a self-verification signal modulated using a second electrical signal. Optical transmission processing for transmitting the second optical signal for the self-verification optical dedicated line, demodulating the third optical signal for uplink propagating in the space into a third electrical signal, and propagating the self-verification optical dedicated line optical reception processing for demodulating the received second optical signal into a fourth electrical signal; outputting the first electrical signal, outputting the second electrical signal, processing the third electrical signal, and processing the fourth electrical signal; data processing to verify the normality of

ADVANTAGE OF THE INVENTION According to this invention, there exists an effect that a soundness check of the optical communication apparatus for satellite mounting can be performed even by itself.

1 is a block diagram showing an example of a configuration of a free space optical communication system according to a first embodiment of the present invention; FIG. FIG. 5 is a block diagram showing an example of the configuration of an optical communication device according to a second embodiment of the present invention; FIG. 10 is a diagram showing an example of signal routes when only the first transmission light output section (for communication) is in operation according to the second embodiment of the present invention; FIG. 10 is a diagram showing an example of signal routes when only the second transmission light output section (for self-verification) is in operation according to the second embodiment of the present invention; FIG. 9 is a block diagram showing an example of the configuration of an optical communication device of a first modified example in the second embodiment of the present invention; FIG. 10 is a schematic diagram showing the operation of the optical communication device of the second modification of the second embodiment of the present invention; 1 is a block diagram showing an example of a hardware configuration capable of realizing an optical communication device according to each embodiment of the present invention; FIG.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, in all the drawings, the same reference numerals are given to the same constituent elements, and the description thereof will be omitted as appropriate.
(First embodiment)
A first embodiment of the present invention, which is the basis of each embodiment of the present invention, will be described.

FIG. 1 is a block diagram showing an example of the configuration of a free space optical communication system according to the first embodiment of the present invention. As shown in FIG. 1, the optical space communication system 100 in this embodiment includes a satellite-mounted optical communication device 200 and a ground station optical communication device 300 .

The optical communication device 200 includes an optical transmitter 210 , an optical receiver 230 and a data processor 240 . The optical transmission unit 210 and the optical reception unit 230 are connected by a dedicated self-verification optical line 220 . The self-verification optical dedicated line 220 is, for example, an optical fiber.

The optical transmission unit 210 transmits a downlink first optical signal modulated using the first electrical signal to space, and transmits a second optical signal for self-verification modulated using the second electrical signal. It is transmitted to the optical dedicated line 220 .

The optical receiver 230 demodulates the third uplink optical signal propagating through space into a third electrical signal, and demodulates the second optical signal propagating through the dedicated self-verification optical line 220 into a fourth electrical signal. do.

The data processor 240 outputs the first electrical signal to the optical transmitter 210 and outputs the second electrical signal to the optical transmitter 210 . The data processor 240 also processes the third electrical signal input from the optical receiver 230 and verifies the normality of the fourth electrical signal input from the optical receiver 230 .

The optical communication device 300 receives the first optical signal propagating through the space and transmits the third optical signal to the space.

As described above, in the free-space optical communication system 100 according to the present embodiment, the optical transmitter 210 transmits the second optical signal for self-verification modulated using the second electrical signal to the dedicated self-verification optical line 220. . The optical receiver 230 also demodulates the second optical signal propagating through the self-verification optical dedicated line 220 into a fourth electrical signal. The data processor 240 then outputs the second electrical signal to the optical transmitter 210 . The data processor 240 then verifies the normality of the fourth electrical signal input from the optical receiver 230 . That is, the data processing unit 240, for example, verifies whether or not the data represented by the second electrical signal and the data represented by the fourth electrical signal match, thereby determining whether the optical transmission unit 210 and the optical reception unit included in the optical communication device 200 230 and the data processing unit 240 are operating normally. Therefore, the free-space optical communication system 100 according to the present embodiment has the effect that it is possible to check the soundness of the satellite-mounted optical communication device by itself.

That is, the ground station optical communication device 300 only needs to instruct the satellite-mounted optical communication device 200 to confirm the soundness, and no special measuring instrument or the like is required. In addition, in the satellite-mounted optical communication device 200, in confirming the soundness of the optical communication device 200, uplink light from the ground station optical communication device 300 and input from other satellite-mounted optical communication devices Doesn't require light. Further, in the satellite-mounted optical communication device 200, when confirming the soundness of the optical communication device 200, the ground station optical communication device 300 that receives the downlink light output from the optical communication device 200 and the optical communication device 200 There is no need for another satellite-mounted optical communication device or the like for receiving the transmitted light output by the satellite.

Incidentally, in the optical communication device 200 according to this embodiment, the first optical signal and the second optical signal may have different wavelengths (see a second embodiment described later). The optical transmitter 210 may include an optical modulator, a second optical splitter, and a second filter. Here, the optical modulator outputs both the first optical signal and the second optical signal. Also, the second optical branching unit branches the first optical signal and the second optical signal input from the optical modulation unit toward the space and self-verification optical dedicated line 220 . The second filter section selectively outputs the second optical signal to the dedicated self-verification light line 220 from the optical signals branched toward the dedicated self-verification light line 220 by the second optical branching section. In this case, the free space optical communication system 100 has the effect that the optical modulator is used for both the first optical signal and the second optical signal.

Further, in the optical communication device 200 according to the present embodiment, the optical transmission section 210 is a first filter section that selectively outputs the first optical signal to the space from the optical signals branched toward the space by the second optical branch section. may further include (see the second embodiment described below). In this case, the free space optical communication system 100 has the effect of suppressing the reception of the second optical signal even when the optical communication device 300 may receive the unnecessary second optical signal. .

Also, in the optical communication device 200 of this embodiment, the second optical signal and the third optical signal may have different wavelengths (see a second embodiment described later). The optical receiver 230 may include a third optical splitter and an optical demodulator. Here, the third optical splitter joins the third optical signal that has propagated through the space and the second optical signal that has propagated through the dedicated self-verification optical line 220 . Also, the optical demodulator receives the third optical signal and the second optical signal merged by the third optical splitter, respectively, and outputs the third electrical signal and the fourth electrical signal. In this case, the free space optical communication system 100 has the effect that the optical demodulator is used for both the second optical signal and the third optical signal.

Further, in the optical communication device 200 according to this embodiment, the data processing section 240 may repeatedly verify the normality of the fourth electrical signal input from the optical receiving section 230 (see a second embodiment described below). The data processor 240 may then verify the normality of the third electrical signal input from the optical receiver 230 . Then, the data processing unit 240 determines whether there is an abnormality in the spatial propagation of the first optical signal or the third optical signal (light caused by clouds or precipitation) based on the verification result of the normality of the third electrical signal and the fourth electrical signal. signal non-delivery, etc.) may be estimated. In this case, the free space optical communication system 100 has the effect of estimating an abnormality in the space propagation of the first optical signal or the third optical signal.
(Second embodiment)
A second embodiment of the present invention based on the first embodiment of the present invention will be described.

The satellite-mounted optical communication device according to the second embodiment of the present invention has a self-verification function of the on-orbit optical communication device. Then, the satellite-mounted optical communication device modulates the transmission light for self-verification generated in the optical communication device by the optical modulation unit. Then, the optical communication device inputs the modulated optical signal to the optical receiver via the self-verification optical dedicated line. Then, the optical communication device demodulates the input transmission light for self-verification and inputs it to the data processing unit. Then, the optical communication device reproduces the input demodulated data in the data reproduction unit, and verifies the reproduced data.

A configuration in this embodiment will be described.

FIG. 2 is a block diagram showing an example of the configuration of an optical communication device according to the second embodiment of the present invention. As shown in FIG. 2 , the optical communication device 205 in this embodiment includes an optical transmitter 215 , an optical receiver 235 and a data processor 245 . The optical transmission unit 215 and the optical reception unit 235 are connected by a dedicated self-verification optical line 225 . The self-verification optical dedicated line 225 is, for example, an optical fiber.

The optical transmission section 215 includes a first transmission light output section 415, a second transmission light output section 425, a first optical branching section 435, an optical modulation section 445, a second optical branching section 455, and a first optical filter. A portion 465 and a second optical filter portion 475 are included.

The first transmission light output unit 415 outputs light (downlink light) used in the downlink during communication. The first transmission light output section 415 is, for example, a laser diode.

The second transmission light output unit 425 outputs light used for self-verification (self-verification light). The self-verification light typically has a different wavelength than the downlink light. The second transmission light output section 425 is, for example, a laser diode.

The first optical splitter 435 outputs the light input from the first transmission light output section 415 and the second transmission light output section 425 to the optical modulation section 445 . The first optical splitter 435 is, for example, a beam splitter.

The second optical splitter 455 outputs the optical signal input from the optical modulator 445 and used for communication to the first optical filter 465, and outputs the optical signal input from the optical modulator 445 and used for self-verification to the second optical splitter 455. Output to the optical filter unit 475 . The second optical splitter 455 is, for example, a beam splitter.

The first optical filter section 465 selectively outputs an optical signal used for communication among the optical signals input from the second optical branching section 455 to the outside. The first optical filter section 465 is, for example, a bandpass filter.

The second optical filter unit 475 selectively outputs an optical signal used for self-verification among the optical signals input from the second optical branching unit 455 to the self-verification optical dedicated line 225 . The second optical filter section 475 is, for example, a bandpass filter.

The data processing unit 245 includes a data generation unit 615, an optical modulation unit control unit 625, a first transmission light output unit control unit 635, a second transmission light output unit control unit 645, an optical demodulation unit control unit 655, It includes a data reproducing section 665 and a data verifying section 675 .

The data generator 615 outputs an electrical signal representing transmission data.

The optical modulation section control section 625 controls the operation of the optical modulation section 445 .

The first transmission light output section control section 635 controls the operation of the first transmission light output section 415 .

The second transmission light output section control section 645 controls the operation of the second transmission light output section 425 .

The optical demodulator controller 655 controls the operation of the optical demodulator 525 .

The optical modulation unit 445 modulates the light input from the first transmission light output unit 415 using the electrical signal input from the data generation unit 615 during communication, thereby generating an optical signal for transmission (downlink optical signal). is generated and output to the outside through the first optical filter section 465 . Also, during self-verification, the optical modulation unit 445 modulates the light input from the second transmission light output unit 425 using the electrical signal input from the data generation unit 615 to generate an optical signal for self-verification (self A verification optical signal) is generated and output to the dedicated self-verification light line 225 via the second optical filter section 475 . The light modulator 445 is, for example, an electrorefractive modulator or an electroabsorption modulator. Since optical modulators are widely known to those skilled in the art, detailed description thereof will be omitted.

The optical receiver 235 includes a third optical splitter 515 and an optical demodulator 525 .

The third optical splitter 515 outputs to the optical demodulator 525 an uplink optical signal input from the outside (earth station) and a self-verification optical signal input from the dedicated line for self-verification light. The third optical splitter 515 is, for example, a beam splitter.

During communication, the optical demodulator 525 demodulates the uplink optical signal input from the third optical splitter 515 to convert it into uplink data, and outputs the uplink data to the data regenerator 665 . During self-verification, the optical demodulator 525 demodulates the self-verification optical signal input from the third optical splitter 515 via the self-verification light dedicated line 225, thereby converting it into self-verification data. The data for verification is output to the data reproduction unit 665 . The optical demodulator 525 is, for example, a digital coherent optical receiver. Since optical demodulators are widely known to those skilled in the art, detailed description thereof is omitted.

The data reproduction unit 665 processes the uplink data input from the optical demodulation unit 525 and outputs self-verification data to the data verification unit 675 .

The data verification unit 675 confirms the soundness of the optical communication device 205 based on the self-verification data input from the data reproduction unit 665 .

Operations in this embodiment will be described.

FIG. 3 is a diagram showing an example of signal routes when only the first transmission light output section (for communication) is in operation according to the second embodiment of the present invention. FIG. 4 is a diagram showing an example of signal routes when only the second transmission light output section (for self-verification) is in operation according to the second embodiment of the present invention. In FIGS. 3 and 4, unused signal routes are indicated by dashed lines.

The first optical filter unit 465 selectively outputs downlink light from the optical signal input from the second optical splitter 455 to the outside (FIG. 3). On the other hand, the second optical filter section 475 selectively outputs the self-verification optical signal among the optical signals input from the second optical splitter 455 to the self-verification light dedicated line 225 (FIG. 4). Therefore, the light output from the first transmission light output section 415 is used only for the downlink optical signal and not for the self-verification optical signal (FIG. 3). Also, the light output from the second transmission light output section 425 is used only for the self-verification optical signal and not for the downlink optical signal (FIG. 4).

The optical modulator controller 625 controls the operation of the opposing optical communication device so that the uplink optical signal is not input when the self-verification optical signal is used. For example, when using the self-verification optical signal, the optical modulation unit control unit 625 transmits a command to suppress the uplink optical signal to the optical communication apparatus 300 for the opposite ground station.

Then, the optical modulation unit control unit 625 operates the second transmission light output unit 425 and causes the data generation unit 615 to output an electric signal representing the self-verification data. The first transmission light output section 415 and the second transmission light output section 425 may operate in parallel or may operate exclusively.

The data verification unit 675 confirms the soundness of the optical communication device 205 based on the self-verification data input from the data reproduction unit 665 . The data verification unit 675 confirms the soundness of the optical communication device 205 by, for example, determining whether or not the transmitted self-verification data can be received correctly. Items that can be confirmed using the self-verification data include transmission of the self-verification optical signal, normal operation of the optical modulator 445 , normal operation of the optical demodulator 525 , and normal operation of the data processor 245 .

As described above, in the optical communication device 205 of this embodiment, the soundness confirmation of the optical transmission unit 215 for the downlink optical signal, the optical reception unit 235 for the uplink optical signal, and the data processing unit 245 is can be executed by the optical communication device 205 alone. Therefore, the optical communication device 205 in this embodiment has an effect that it is possible to check the soundness of the satellite-mounted optical communication device by itself.

A modification of this embodiment will be described.
(First modification)
FIG. 5 is a block diagram showing an example of the configuration of the optical communication device of the first modified example of the second embodiment of the present invention. As shown in FIG. 5, the optical communication device 206 in this modification includes an optical transmitter 216, an optical receiver 235, and a data processor 245. FIG.

The optical transmission section 216 includes a first transmission light output section 415, a second transmission light output section 425, a first optical branching section 435, an optical modulation section 445, a second optical branching section 455, and a second optical filter. 475. That is, the optical transmission section 216 does not include the first optical filter section 465 .

Other configurations in this modified example are the same as those in the above-described second embodiment.

In the ground station optical communication apparatus 300 that receives the downlink optical signal, the self-verification optical signal may interfere with the reception of the downlink optical signal because the self-verification optical signal can be removed from the downlink optical signal. If not, optical communication device 206 may be used instead of optical communication device 205 .

The optical communication device 206 of this modified example has the effect of simplifying the configuration compared to the optical communication device 205 .
(Second modification)
In optical signals propagating in the atmosphere between the ground and satellites, high-speed signal strength level fluctuations and momentary interruptions may occur due to clouds, precipitation, and the like. Therefore, communication between the ground and the satellite is not possible, and it may be difficult to identify the location of the abnormality.

FIG. 6 is a schematic diagram showing the operation of the optical communication device of the second modification of the second embodiment of the present invention. Unless otherwise specified, the optical communication device 207 in this modified example has the same configuration as the optical communication device 205 described above. The optical communication device 207 is capable of confirming the soundness of the optical communication device 207 on orbit, just like the optical communication device 205, even if the optical communication device 207 alone is mounted on a satellite.

The optical modulation unit control unit 625 of the optical communication device 207 operates the first transmission light output unit 415 and the second transmission light output unit 425 in parallel to convert the downlink optical signal to the optical communication device 300 for the ground station. , and self-verification of the optical communication device 207 is performed. That is, the data verification unit 675 of the optical communication device 207 repeatedly confirms the soundness of the optical communication device 207 based on the self-verification data input from the data reproduction unit 665 . Also, the data verification unit 675 of the optical communication device 207 checks the integrity of the communication between the optical communication device 207 and the optical communication device 300 based on the communication data input from the data reproduction unit 665 .

The data verification unit 675 of the optical communication device 207 confirms the soundness of the communication between the optical communication device 207 and the optical communication device 300 and based on the most recent soundness confirmation of the optical communication device 207, the optical communication device 207 and the optical communication device. Estimate the quality of the optical signal (uplink light and downlink light) in the atmosphere between the devices 300 .

That is, the data verification unit 675 of the optical communication device 207 checks both the satellite-mounted optical communication device 207 (portion (b) in FIG. 6) and the optical signal propagating in the atmosphere (portion (c) in FIG. 6). abnormalities can be detected.

Alternatively, the ground station optical communication device 300 may estimate the quality of the optical signal propagating through the atmosphere. For example, the optical communication device 300 periodically receives the soundness confirmation result of the satellite-mounted optical communication device 207 (portion (b) in FIG. 6) from the optical communication device 207 in advance. Then, the optical communication device 300 confirms the normality of communication with the optical communication device 207 (portion (a) in FIG. 6). Then, when the optical communication device 300 detects an abnormality in communication with the optical communication device 207, if the soundness confirmation result of the optical communication device 207 received most recently from the optical communication device 207 is not abnormal, It is assumed that the quality of the optical signal propagating through is degraded (portion (c) in FIG. 6). On the other hand, when the optical communication device 300 detects an abnormality in the communication with the optical communication device 207, if the soundness confirmation result of the optical communication device 207 received most recently from the optical communication device 207 is abnormal, the optical communication device 300 Assume that the integrity of the device 207 is lost (portion (b) in FIG. 6).

FIG. 7 is a block diagram showing an example of a hardware configuration capable of realizing an optical communication device according to each embodiment of the present invention.

The optical communication device 901 includes a storage device 902 , a CPU (Central Processing Unit) 903 , a keyboard 904 , a monitor 905 and an I/O (Input/Output) device 908 , which are connected by an internal bus 906 . ing. The storage device 902 stores operation programs of the CPU 903 of the data processing units 240, 245, the optical transmission units 210, 215, 216, the optical reception units 230, 235, etc. (hereinafter referred to as "data processing units, etc."). A CPU 903 controls the entire optical communication device 901 , executes an operation program stored in a storage device 902 , and executes a program such as a data processing unit and transmits/receives data by an I/O device 908 . The internal configuration of the optical communication device 901 described above is an example. The optical communication device 901 may have a configuration in which a keyboard 904 and a monitor 905 are connected as required.

The optical communication device 901 in each of the above-described embodiments of the present invention may be realized by a dedicated device. device). In this case, the computer reads the software program stored in the storage device 902 to the CPU 903 and executes the read software program in the CPU 903 . In the case of each of the above-described embodiments, it is sufficient that the software program includes a description capable of realizing the functions of the respective units of the optical communication device shown in FIGS. However, it is assumed that each of these units includes appropriate hardware. In such a case, such a software program (computer program) can be regarded as constituting the present invention. Furthermore, a computer-readable storage medium storing such a software program can also be regarded as constituting the present invention.

As above, the present invention has been exemplified by each of the above-described embodiments and modifications thereof. However, the technical scope of the present invention is not limited to the scope described in each of the above-described embodiments and modifications thereof. It is obvious to those skilled in the art that various modifications or improvements can be made to such embodiments. In such cases, new embodiments with such changes or improvements may also be included in the technical scope of the present invention. And this is clear from the matters described in the claims.

INDUSTRIAL APPLICABILITY The present invention can be used for an optical communication device mounted on an artificial satellite.

100 free space optical communication system 200, 205, 207 optical communication device 210, 215, 216 optical transmitter 220, 225 dedicated self-verification optical line 230, 235 optical receiver 300 optical communication device 415 first transmission optical output unit 425 second transmission Optical output unit 435 First optical splitter 445 Optical modulator 455 Second optical splitter 465 First optical filter 475 Second optical filter 515 Third optical splitter 525 Optical demodulator 615 Data generator 625 Optical modulator control Unit 635 First transmission light output unit control unit 645 Second transmission light output unit control unit 655 Optical demodulation unit control unit 665 Data reproduction unit 675 Data verification unit 901 Optical communication device 902 Storage device 903 CPU
904 keyboard 905 monitor 906 internal bus 908 I/O device

Claims (8)

transmitting into space a first downlink optical signal modulated with the first electrical signal;
optical transmission means for transmitting a second optical signal for self-verification modulated using a second electrical signal to a dedicated line for self-verification light;
Demodulating the third optical signal for uplink propagating in space into a third electrical signal,
optical receiving means for demodulating the second optical signal propagating through the self-verification optical dedicated line into a fourth electrical signal;
outputting the first electrical signal to the optical transmission means;
outputting the second electrical signal to the optical transmission means;
while processing the third electrical signal input from the optical receiving means;
and data processing means for verifying normality of the fourth electrical signal input from the optical receiving means. the first optical signal and the second optical signal have wavelengths different from each other;
The optical transmission means is
common optical modulation means for outputting both the first optical signal and the second optical signal;
a second optical branching means for branching the first optical signal and the second optical signal input from the optical modulation means toward space and the dedicated line for self-verification light;
and second filter means for selectively outputting said second optical signal to said dedicated self-verification light line from among the optical signals branched by said second optical branching means toward said dedicated self-verification light line. 2. The optical communication device according to 1. 3. The optical transmission means according to claim 2, further comprising a first filter means for selectively outputting the first optical signal to the space from the optical signals branched to the space by the second optical branching means. Optical communication device. the second optical signal and the third optical signal have wavelengths different from each other;
The optical receiving means is
a third optical branching means for joining the third optical signal propagating through the space and the second optical signal propagating through the dedicated self-verification optical line;
common optical demodulation means for inputting the third optical signal and the second optical signal merged by the third optical branching means and outputting both the third electrical signal and the fourth electrical signal; The optical communication device according to any one of claims 1 to 3. The data processing means repeatedly verifies the normality of the fourth electrical signal input from the optical receiving means,
The data processing means verifies the normality of the third electrical signal input from the optical receiving means,
2. The data processing means estimates an anomaly in the spatial propagation of the first optical signal or the third optical signal based on the verification result of the normality of the third electrical signal and the fourth electrical signal. 5. The optical communication device according to any one of items 1 through 4. The optical communication device according to any one of claims 1 to 5;
Receiving the first optical signal that has propagated through space,
and an optical communication device for a ground station that transmits the third optical signal into space. transmitting into space a first downlink optical signal modulated with the first electrical signal;
Optical transmission processing for transmitting a second optical signal for self-verification modulated using a second electrical signal to a self-verification optical dedicated line;
Demodulating the third optical signal for uplink propagating in space into a third electrical signal,
an optical reception process for demodulating the second optical signal propagating through the self-verification dedicated optical line into a fourth electrical signal;
While outputting the first electrical signal,
While outputting the second electrical signal,
processing the third electrical signal;
verifying the normality of the fourth electrical signal; and performing data processing. transmitting into space a first downlink optical signal modulated with the first electrical signal;
Optical transmission processing for transmitting a second optical signal for self-verification modulated using a second electrical signal to a self-verification optical dedicated line;
Demodulating the third optical signal for uplink propagating in space into a third electrical signal,
an optical reception process for demodulating the second optical signal propagating through the self-verification dedicated optical line into a fourth electrical signal;
While outputting the first electrical signal,
While outputting the second electrical signal,
processing the third electrical signal;
An optical communication program that causes a computer to perform data processing for verifying the normality of the fourth electrical signal.

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