Optical communication device, optical space communication system, optical communication method, and optical communication program

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

Technical Field

[0001] The present invention relates to self-verification technologies such as optical communication devices.

Background Art

[0002] In recent years, with the development of broadband satellite communication services such as high-throughput satellites, the need for increasing the capacity of satellite communication has been growing. As a technology to meet such a need, expectations for optical space communication technology between the ground and satellites have been increasing.

[0003] In addition, with the increase in the capacity of satellite communication, the opportunity for incorporating new technologies and components for general purposes other than those for aerospace into optical communication devices for satellite mounting has been increasing. Components for general purposes are less expensive and more readily available than aerospace components, and while new technologies are introduced early, their reliability is low. Therefore, it has become necessary to verify the normality of optical communication devices in orbit. Also, in satellite communication, it is necessary to evaluate the quality of optical signals propagating through the atmosphere between the ground and satellites.

[0004] An example of optical space communication technology between the ground and satellites is disclosed in Patent Document 1. The optical receiver described in Patent Document 1 is used in a space environment for satellite mounting.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] In the general technology of an optical space communication system between the ground and satellites, an uplink optical signal transmitted from an optical communication device for a ground station is propagated and received by an optical communication device mounted on a satellite. Also, a downlink optical signal transmitted from an optical communication device mounted on a satellite is propagated and received by an optical communication device for a ground station. Therefore, for the integrity check (normal verification) of an optical communication device mounted on a satellite, it is necessary to prepare an optical communication device for a ground station. Similarly, for the integrity check of an optical communication device between satellites, it is also necessary to prepare an optical communication device mounted on the other opposing satellite. Here, the optical receiver described in Patent Document 1 does not have a function of performing the integrity check of the optical receiver alone. Therefore, there has been a problem that an optical communication device mounted on a satellite, such as the optical receiver described in Patent Document 1, cannot perform the integrity check of the optical communication device mounted on a satellite alone.

[0007] The present invention has been made in view of the above-described problems, and a main object thereof is to enable the integrity check of an optical communication device mounted on a satellite to be performed alone.

Means for Solving the Problems

[0008] In one aspect of the present invention, an optical communication device transmits a first optical signal for downlink modulated using a first electrical signal into space, and transmits a second optical signal for self-verification modulated using a second electrical signal to a dedicated self-verification optical line; an optical receiving means for demodulating a third optical signal for uplink propagated through space into a third electrical signal, and demodulating the second optical signal propagated through the dedicated self-verification optical line into a fourth electrical signal; and data processing means for outputting the first electrical signal to the optical transmitting means, outputting the second electrical signal to the optical transmitting means, processing the third electrical signal input from the optical receiving means, and verifying the normality of the fourth electrical signal input from the optical receiving means.

[0009] In one aspect of the present invention, an optical space communication system transmits a first optical signal for downlink modulated using a first electrical signal into space, and transmits a second optical signal for self-verification modulated using a second electrical signal to a dedicated self-verification optical line. The system includes an optical transmission means, an optical reception means, and a data processing means. The optical reception means demodulates an uplink third optical signal that has propagated through space into a third electrical signal, and demodulates the second optical signal that has propagated through the dedicated self-verification optical line into a fourth electrical signal. The data processing means outputs the first electrical signal to the optical transmission means, outputs the second electrical signal to the optical transmission means, processes the third electrical signal input from the optical reception means, and verifies the normality of the fourth electrical signal input from the optical reception means. The optical communication device includes the above components, and a ground station optical communication device that receives the first optical signal that has propagated through space and transmits the third optical signal into space.

[0010] In one aspect of the present invention, an optical communication method includes an optical transmission process of transmitting a first optical signal for downlink modulated using a first electrical signal into space and transmitting a second optical signal for self-verification modulated using a second electrical signal to a dedicated self-verification optical line, an optical reception process of demodulating an uplink third optical signal that has propagated through space into a third electrical signal and demodulating the second optical signal that has propagated through the dedicated self-verification optical line into a fourth electrical signal, and a data process of outputting the first electrical signal, outputting the second electrical signal, processing the third electrical signal, and verifying the normality of the fourth electrical signal.

[0011] In one aspect of the present invention, an optical communication program causes a computer to execute an optical transmission process of transmitting a first optical signal for downlink modulated using a first electrical signal into space and transmitting a second optical signal for self-verification modulated using a second electrical signal to a dedicated self-verification optical line, an optical reception process of demodulating an uplink third optical signal that has propagated through space into a third electrical signal and demodulating the second optical signal that has propagated through the dedicated self-verification optical line into a fourth electrical signal, and a data process of outputting the first electrical signal, outputting the second electrical signal, processing the third electrical signal, and verifying the normality of the fourth electrical signal.

Effects of the Invention

[0012] According to the present invention, there is an effect that the soundness confirmation of the optical communication device for satellite mounting can be executed even alone.

Brief Description of the Drawings

[0013]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Modes for Carrying Out the Invention

[0014] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In all the drawings, the same reference numerals are assigned to equivalent components, and the description will be omitted as appropriate. (First Embodiment) The first embodiment of the present invention, which is the basis of each embodiment of the present invention, will be described.

[0015] FIG. 1 is a block diagram showing an example of the configuration of the optical space communication system in the first embodiment of the present invention. As shown in FIG. 1, the optical space communication system 100 in the present embodiment includes an optical communication device 200 for satellite mounting and an optical communication device 300 for a ground station.

[0016] The optical communication device 200 includes an optical transmission unit 210, an optical reception unit 230, and a data processing unit 240. The optical transmission unit 210 and the optical reception unit 230 are connected by a self-verifying optical dedicated line 220. The self-verifying optical dedicated line 220 is, for example, an optical fiber.

[0017] The optical transmission unit 210 transmits a first optical signal for the downlink modulated using a first electrical signal into space, and transmits a second optical signal for self-verification modulated using a second electrical signal to the self-verifying optical dedicated line 220.

[0018] The optical reception unit 230 demodulates a third optical signal for the uplink propagated through space into a third electrical signal, and demodulates the second optical signal propagated through the self-verifying optical dedicated line 220 into a fourth electrical signal.

[0019] The data processing unit 240 outputs the first electrical signal to the optical transmission unit 210 and outputs the second electrical signal to the optical transmission unit 210. Further, the data processing unit 240 processes the third electrical signal input from the optical reception unit 230 and verifies the normality of the fourth electrical signal input from the optical reception unit 230.

[0020] The optical communication device 300 receives the first optical signal propagated through space and transmits the third optical signal into space.

[0021] As described above, in the optical space communication system 100 according to the present embodiment, the optical transmission unit 210 transmits a second optical signal for self-verification modulated using a second electrical signal to the dedicated self-verification optical line 220. Further, the optical reception unit 230 demodulates the second optical signal that has propagated through the dedicated self-verification optical line 220 into a fourth electrical signal. Then, the data processing unit 240 outputs the second electrical signal to the optical transmission unit 210. And the data processing unit 240 verifies the normality of the fourth electrical signal input from the optical reception unit 230. That is, the data processing unit 240 can verify whether the optical transmission unit 210, the optical reception unit 230, and the data processing unit 240 included in the optical communication device 200 are operating normally by, for example, verifying whether the data represented by the second electrical signal and the fourth electrical signal match. Therefore, the optical space communication system 100 according to the present embodiment has an effect that the soundness confirmation of the optical communication device for satellite mounting can be executed even alone.

[0022] That is, in the optical communication device 300 for a ground station, it is only necessary to instruct the optical communication device 200 for satellite mounting to perform a soundness check, and no special measuring instrument or the like is required. Further, in the optical communication device 200 for satellite mounting, in the soundness check of the optical communication device 200, uplink light from the optical communication device 300 for a ground station, input light from other optical communication devices for satellite mounting, etc. are not required. Further, in the optical communication device 200 for satellite mounting, in the soundness check of the optical communication device 200, the optical communication device 300 for a ground station that receives the downlink light output by the optical communication device 200, and other optical communication devices for satellite mounting that receive the transmission light output by the optical communication device 200, etc. are not required.

[0023] Furthermore, in the optical communication device 200 according to the present embodiment, the first optical signal and the second optical signal may have different wavelengths from each other (see the second embodiment described later). And the optical transmission unit 210 may include an optical modulation unit, a second optical branching unit, and a second filter unit. Here, the optical modulation unit 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 the self-verification optical dedicated line 220. Also, the second filter unit selectively outputs the second optical signal to the self-verification optical dedicated line 220 from the optical signals branched by the second optical branching unit toward the self-verification optical dedicated line 220. In this case, in the optical space communication system 100, there is an effect that the optical modulation unit is shared for both the first optical signal and the second optical signal.

[0024] Furthermore, in the optical communication device 200 according to the present embodiment, the optical transmission unit 210 may further include a first filter unit that selectively outputs the first optical signal to the space from the optical signals branched toward the space by the second optical branching unit (see the second embodiment described later). In this case, in the optical space communication system 100, there is an effect that the reception of the second optical signal is suppressed even when there is a possibility that the optical communication device 300 receives an unnecessary second optical signal.

[0025] Also, in the optical communication device 200 according to the present embodiment, the second optical signal and the third optical signal may have different wavelengths from each other (see the second embodiment described later). And the optical reception unit 230 may include a third optical branching unit and an optical demodulation unit. Here, the third optical branching unit combines the third optical signal that has propagated through the space and the second optical signal that has propagated through the self-verification optical dedicated line 220. Also, the optical demodulation unit inputs the third optical signal and the second optical signal combined by the third optical branching unit respectively, and outputs a third electrical signal and a fourth electrical signal. In this case, in the optical space communication system 100, there is an effect that the optical demodulation unit is shared for both the second optical signal and the third optical signal.

[0026] Furthermore, in the optical communication device 200 according to the present embodiment, the data processing unit 240 may repeatedly verify the normality of the fourth electrical signal input from the optical receiving unit 230 (see the second embodiment described later). Then, the data processing unit 240 may verify the normality of the third electrical signal input from the optical receiving unit 230. Then, based on the verification results of the normality of the third electrical signal and the fourth electrical signal, the data processing unit 240 may estimate an abnormality (such as non-arrival of an optical signal due to clouds or precipitation) in the spatial propagation of the first optical signal or the third optical signal. In this case, the optical space communication system 100 has an effect that an abnormality in the spatial propagation of the first optical signal or the third optical signal can be estimated. (Second Embodiment) A second embodiment of the present invention based on the first embodiment of the present invention will be described.

[0027] The optical communication device for satellite mounting according to the second embodiment of the present invention has a self-verification function of the optical communication device in orbit. Then, the optical communication device for satellite mounting modulates the self-verification transmission light generated in the optical communication device by an optical modulation unit. Then, the optical communication device inputs the modulated optical signal to the optical receiving unit via a dedicated self-verification optical line. Then, the optical communication device demodulates the input self-verification transmission light and inputs it to the data processing unit. Then, the optical communication device regenerates the input demodulated data by a data regeneration unit and verifies the regenerated data.

[0028] The configuration in the present embodiment will be described.

[0029] FIG. 2 is a block diagram showing an example of the configuration of the optical communication device according to the second embodiment of the present invention. As shown in FIG. 2, the optical communication device 205 in the present embodiment includes an optical transmission unit 215, an optical reception unit 235, and a data processing unit 245. The optical transmission unit 215 and the optical reception unit 235 are connected by a dedicated self-verification optical line 225. The dedicated self-verification optical line 225 is, for example, an optical fiber.

[0030] The optical transmission unit 215 includes a first transmission optical output unit 415, a second transmission optical output unit 425, a first optical branching unit 435, an optical modulation unit 445, a second optical branching unit 455, a first optical filter unit 465, and a second optical filter unit 475.

[0031] The first transmission optical output unit 415 outputs light (downlink light) used for downlink during communication. The first transmission optical output unit 415 is, for example, a laser diode.

[0032] The second transmission optical output unit 425 outputs light (self-verification light) used for self-verification. Usually, the self-verification light has a wavelength different from that of the downlink light. The second transmission optical output unit 425 is, for example, a laser diode.

[0033] The first optical branching unit 435 outputs the light input from the first transmission optical output unit 415 and the second transmission optical output unit 425 to the optical modulation unit 445. The first optical branching unit 435 is, for example, a beam splitter.

[0034] The second optical branching unit 455 outputs the optical signal used for communication input from the optical modulation unit 445 to the first optical filter unit 465, and outputs the optical signal used for self-verification input from the optical modulation unit 445 to the second optical filter unit 475. The second optical branching unit 455 is, for example, a beam splitter.

[0035] The first optical filter unit 465 selectively outputs the optical signal used for communication among the optical signals input from the second optical branching unit 455 to the outside. The first optical filter unit 465 is, for example, a band-pass filter.

[0036] The second optical filter unit 475 selectively outputs the optical signal used for self-verification among the optical signals input from the second optical branching unit 455 to the self-verification light dedicated line 225. The second optical filter unit 475 is, for example, a band-pass filter.

[0037] The data processing unit 245 includes a data generation unit 615, an optical modulation unit control unit 625, a first transmission optical output unit control unit 635, a second transmission optical output unit control unit 645, an optical demodulation unit control unit 655, a data reproduction unit 665, and a data verification unit 675.

[0038] The data generation unit 615 outputs an electrical signal representing the transmission data.

[0039] The optical modulation unit control unit 625 controls the operation of the optical modulation unit 445.

[0040] The first transmission optical output unit control unit 635 controls the operation of the first transmission optical output unit 415.

[0041] The second transmission optical output unit control unit 645 controls the operation of the second transmission optical output unit 425.

[0042] The optical demodulation unit control unit 655 controls the operation of the optical demodulation unit 525.

[0043] During communication, the optical modulation unit 445 uses the electrical signal input from the data generation unit 615 to modulate the light input from the first transmission optical output unit 415, thereby generating an optical signal for transmission (downlink optical signal), and outputs it to the outside via the first optical filter unit 465. Also, during self-verification, the optical modulation unit 445 uses the electrical signal input from the data generation unit 615 to modulate the light input from the second transmission optical output unit 425, thereby generating an optical signal for self-verification (self-verification optical signal), and outputs it to the self-verification optical dedicated line 225 via the second optical filter unit 475. The optical modulation unit 445 is, for example, an electro-refractive modulator or an electro-absorption modulator. Since optical modulators are widely known to those skilled in the art, detailed description is omitted.

[0044] The optical reception unit 235 includes a third optical branching unit 515 and an optical demodulation unit 525.

[0045] The third optical branching unit 515 outputs the uplink optical signal input from the outside (ground station) and the self-verification optical signal input from the self-verification optical dedicated line to the optical demodulation unit 525. The third optical branching unit 515 is, for example, a beam splitter.

[0046] During communication, the optical demodulation unit 525 demodulates the uplink optical signal input from the third optical branching unit 515 to convert it into uplink data, and outputs the uplink data to the data reproduction unit 665. Also, during self-verification, the optical demodulation unit 525 demodulates the self-verification optical signal input from the third optical branching unit 515 via the self-verification optical dedicated line 225 to convert it into self-verification data, and outputs the self-verification data to the data reproduction unit 665. The optical demodulation unit 525 is, for example, a digital coherent optical receiver. Since optical demodulators are widely known to those skilled in the art, detailed description is omitted.

[0047] The data reproduction unit 665 processes the uplink data input from the optical demodulation unit 525 and outputs the self-verification data to the data verification unit 675.

[0048] The data verification unit 675 performs a soundness check of the optical communication device 205 based on the self-verification data input from the data reproduction unit 665.

[0049] The operation in this embodiment will be described.

[0050] FIG. 3 is a diagram showing an example of a signal route during the operation of only the first transmission optical output unit (for communication) in the second embodiment of the present invention. FIG. 4 is a diagram showing an example of a signal route during the operation of only the second transmission optical output unit (for self-verification) in the second embodiment of the present invention. In FIGS. 3 and 4, unused signal routes are indicated by dotted lines.

[0051] The first optical filter section 465 selectively outputs the downlink optical signal among the optical signals input from the second optical branching section 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 branching section 455 to the self-verification optical 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).

[0052] The optical modulation section control section 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, the optical modulation section control section 625 transmits a command to suppress the uplink optical signal to the optical communication device 300 for the opposing terrestrial station when the self-verification optical signal is used.

[0053] Then, after operating the second transmission light output section 425, the optical modulation section control section 625 causes the data generation section 615 to output an electrical 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.

[0054] The data verification section 675 performs a soundness check of the optical communication device 205 based on the self-verification data input from the data reproduction section 665. For example, the data verification section 675 performs a soundness check of the optical communication device 205 by determining whether the transmitted self-verification data can be received correctly. Items that can be verified using the self-verification data include the transmission of the self-verification optical signal, the normal operation of the optical modulation section 445, the normal operation of the optical demodulation section 525, and the normal operation of the data processing section 245.

[0055] As described above, in the optical communication device 205 of the present 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 can be executed even by the optical communication device 205 for satellite mounting alone. Therefore, the optical communication device 205 in the present embodiment has the effect that the soundness confirmation of the optical communication device for satellite mounting can be executed alone.

[0056] A modification example in the present embodiment will be described. (First modification example) FIG. 5 is a block diagram showing an example of the configuration of an optical communication device according to a first modification example in the second embodiment of the present invention. As shown in FIG. 5, the optical communication device 206 in the present modification example includes an optical transmission unit 216, an optical reception unit 235, and a data processing unit 245.

[0057] The optical transmission unit 216 includes a first transmission optical output unit 415, a second transmission optical output unit 425, a first optical branching unit 435, an optical modulation unit 445, a second optical branching unit 455, and a second optical filter unit 475. That is, the optical transmission unit 216 does not include the first optical filter unit 465.

[0058] Other configurations in the present modification example are the same as those in the second embodiment described above.

[0059] In the optical communication device 300 for a ground station that receives a downlink optical signal, if there is no risk that the self-verification optical signal interferes with the reception of the downlink optical signal, for example, because the self-verification optical signal can be removed from the downlink optical signal, the optical communication device 206 may be used instead of the optical communication device 205.

[0060] The optical communication device 206 of the present modification example has the effect that the configuration can be simplified compared to the optical communication device 205. (Second modification example) In an optical signal propagating through the atmosphere between the ground and the satellite, rapid signal intensity level fluctuations and momentary interruptions may occur due to clouds, precipitation, etc. Therefore, communication between the ground and the satellite may not be possible, and it may be difficult to identify an abnormal location.

[0061] FIG. 6 is a schematic diagram showing the operation of the optical communication device according to the second modification of the second embodiment of the present invention. The optical communication device 207 in this modification has the same configuration as the above-described optical communication device 205 unless otherwise specified. And, on the orbit, the optical communication device 207 can execute the soundness confirmation of the optical communication device 207 alone for satellite mounting, similar to the optical communication device 205.

[0062] The optical modulation unit controller 625 of the optical communication device 207 transmits the downlink optical signal to the optical communication device 300 for the ground station by operating the first transmission optical output unit 415 and the second transmission optical output unit 425 in parallel, and performs self-verification of the optical communication device 207. That is, the data verification unit 675 of the optical communication device 207 repeatedly performs the soundness confirmation 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 performs the soundness confirmation in 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.

[0063] The data verification unit 675 of the optical communication device 207 estimates the quality of the optical signals (uplink light and downlink light) in the atmosphere between the optical communication device 207 and the optical communication device 300 based on the soundness confirmation of the communication between the optical communication device 207 and the optical communication device 300 and the most recent soundness confirmation of the optical communication device 207.

[0064] That is, the data verification unit 675 of the optical communication device 207 can detect the abnormalities of both the optical communication device 207 for satellite mounting (location (b) in FIG. 6) and the optical signal propagating through the atmosphere (location (c) in FIG. 6).

[0065] Alternatively, the optical communication device 300 for the terrestrial station may estimate the quality of the optical signal propagating through the atmosphere. For example, the optical communication device 300 periodically receives, from the optical communication device 207 for satellite mounting, the soundness confirmation result (at location (b) in FIG. 6) in advance. Then, the optical communication device 300 checks the normality (at location (a) in FIG. 6) in the communication with the optical communication device 207. And 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 normal, it is estimated that the quality of the optical signal propagating through the atmosphere has deteriorated (at location (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, it is estimated that the soundness of the optical communication device 207 has been lost (at location (b) in FIG. 6).

[0066] FIG. 7 is a block diagram showing an example of a hardware configuration capable of realizing the optical communication device in each embodiment of the present invention.

[0067] 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. The storage device 902 stores the operation programs of the CPU 903 for 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."). The CPU 903 controls the entire optical communication device 901, executes the operation programs stored in the storage device 902, and performs the execution of the programs and the transmission and reception of data of the data processing units, etc. by the I / O device 908. Note that the internal configuration of the optical communication device 901 described above is an example. The optical communication device 901 may have a device configuration for connecting the keyboard 904 and the monitor 905 as necessary.

[0068] The optical communication device 901 in each of the above-described embodiments of the present invention may be realized by a dedicated device, but can also be realized by a computer (information processing device) except for the operations of the hardware by which the I / O device 908 executes communication with the outside. In this case, such a computer reads out 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 such a software program has a description capable of realizing the functions of each part of the optical communication device shown in FIGS. 1, 2, and 5 as described above. However, it is also assumed that each of these parts appropriately includes hardware. And in such a case, such a software program (computer program) can be regarded as constituting the present invention. Further, a computer-readable storage medium storing such a software program can also be regarded as constituting the present invention.

[0069] As described above, the present invention has been exemplarily described by the above-described embodiments and their modifications. However, the technical scope of the present invention is not limited to the scope described in the above-described embodiments and their modifications. It is obvious to those skilled in the art that various changes or improvements can be made to such embodiments. In such a case, new embodiments with such changes or improvements may also be included in the technical scope of the present invention. And this is obvious from the matters described in the claims.

Industrial Applicability

[0070] The present invention can be used for an optical communication device mounted on a satellite.

Explanation of Signs

[0071] 100 Optical space communication system 200, 205, 207 Optical communication device 210, 215, 216 Optical transmission unit 220, 225 Self-verifying optical dedicated line 230, 235 Optical reception unit 300 Optical communication device 415 First transmission optical output section 425 Second transmission optical output section 435 First optical branching section 445 Optical modulation section 455 Second optical branching section 465 First optical filter section 475 Second optical filter section 515 Third optical branching section 525 Optical demodulation section 615 Data generation section 625 Optical modulation section control unit 635 First transmission optical output section control unit 645 Second transmission optical output section control unit 655 Optical demodulation section control unit 665 Data reproduction section 675 Data verification section 901 Optical communication device 902 Memory device 903 CPU 904 Keyboard 905 Monitor 906 Internal bus 908 I / O device

Claims

1. Transmitting a first optical signal for downlink modulated using a first electrical signal into space, and Transmitting a second optical signal for self-verification modulated using a second electrical signal to a dedicated self-verification optical line Optical transmission means, Demodulating a third optical signal for uplink propagated through space into a third electrical signal, and Demodulating the second optical signal propagated through the dedicated self-verification optical line into a fourth electrical signal Optical reception means, Outputting the first electrical signal to the optical transmission means, and Outputting the second electrical signal to the optical transmission means, and Processing the third electrical signal input from the optical reception means, and Verifying the normality of the fourth electrical signal input from the optical reception means Data processing means And comprising, The first optical signal and the second optical signal have different wavelengths from each other, The optical transmission means, Common optical modulation means for outputting both the first optical signal and the second optical signal, and 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 self-verification optical line, and Second filter means for selectively outputting the second optical signal from the optical signal branched by the second optical branching means toward the dedicated self-verification optical line to the dedicated self-verification optical line An optical communication device comprising.

2. The optical transmission means further comprises first filter means for selectively outputting the first optical signal from the optical signal branched by the second optical branching means toward space to space The optical communication device according to claim 1.

3. The second optical signal and the third optical signal have different wavelengths from each other, The optical reception means, Third optical branching means for merging the third optical signal propagated through space and the second optical signal propagated through the dedicated self-verification optical line, and 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 claim 1 or 2, comprising.

4. The data processing means repeatedly verifies the normality of the fourth electrical signal input from the optical reception means, The data processing means verifies the normality of the third electrical signal input from the optical reception means, The data processing means estimates an abnormality in the propagation of the first optical signal or the third optical signal through space based on the verification results of the normality of the third electrical signal and the fourth electrical signal The optical communication device according to any one of claims 1 to 3.

5. The optical communication device according to any one of claims 1 to 4, receiving the first optical signal that has propagated through space, and transmitting the third optical signal into space an optical communication device for a ground station an optical space communication system comprising.

6. transmitting a first optical signal for a downlink modulated using a first electrical signal into space, and transmitting a second optical signal for self-verification modulated using a second electrical signal to a self-verification optical dedicated line optical transmission processing, demodulating a third optical signal for an uplink that has propagated through space into a third electrical signal, and demodulating the second optical signal that has propagated through the self-verification optical dedicated line into a fourth electrical signal optical reception processing, outputting the first electrical signal, and outputting the second electrical signal, and processing the third electrical signal, and verifying the normality of the fourth electrical signal data processing and executing, wherein the first optical signal and the second optical signal have different wavelengths from each other, wherein the optical transmission processing outputs both the first optical signal and the second optical signal by common optical modulation means, branches the first optical signal and the second optical signal output from the optical modulation means toward space and the self-verification optical dedicated line, selectively outputs the second optical signal from the optical signal branched toward the self-verification optical dedicated line to the self-verification optical dedicated line, an optical communication method.

7. transmitting a first optical signal for a downlink modulated using a first electrical signal into space, and transmitting a second optical signal for self-verification modulated using a second electrical signal to a self-verification optical dedicated line optical transmission processing, demodulating a third optical signal for an uplink that has propagated through space into a third electrical signal, and demodulating the second optical signal that has propagated through the self-verification optical dedicated line into a fourth electrical signal optical reception processing, outputting the first electrical signal, and outputting the second electrical signal, and processing the third electrical signal, and verifying the normality of the fourth electrical signal data processing and causing a computer to execute, wherein the first optical signal and the second optical signal have different wavelengths from each other, wherein the optical transmission processing outputs both the first optical signal and the second optical signal by common optical modulation means, branches the first optical signal and the second optical signal output from the optical modulation means toward space and the self-verification optical dedicated line, An optical communication program that selectively outputs the second optical signal to the self-verification optical dedicated line from an optical signal branched toward the self-verification optical dedicated line. Optical communication program.

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