JP4068252B2 - Spatial propagation light vibration compensation device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an optical communication device that is mounted on a spacecraft such as an artificial satellite and performs optical communication using spatial propagation of light, and an optical observation device that uses spatially propagated light such as an optical distance measuring device. In particular, the present invention relates to a vibration compensation device for the spatially propagated light.
[0002]
[Prior art]
As is well known, in an optical communication device that performs communication using spatial propagation of light, when it is subjected to vibration or the like in its installed state, the spatially propagated light deviates from the propagation range and performs stable communication. It becomes difficult.
[0003]
Therefore, in such an optical communication device, for example, in an installation state mounted on a spacecraft or the like, vibration compensation means for compensating for vibrations transmitted from the outside, for example, so as to prevent the spatially transmitted light transmitted and received from deviating from the propagation range. Provided.
[0004]
The vibration compensation means includes an angle control device provided with a reflecting mirror whose angle can be adjusted in one axis direction corresponding to two axes on the optical path, and the angle control device arranged for each of the two axes. A method of compensating the vibration by selectively driving to control the light position in the biaxial direction of the spatially propagated light is employed.
[0005]
However, in the above-described vibration compensation means, the angle control device is arranged on each of the two axes, and the vibration compensation is performed independently for each axis. Are very large, large, and heavy.
[0006]
By the way, in a spatial propagation optical system that transmits and receives spatial propagation light using such an optical antenna, as a reception system thereof, a tracking scanning system that scans in a wide range and performs tracking and a scanning in a narrow range. It is necessary to provide a vibration tracking means including two angle control devices for controlling the angles around two axes in each of the tracking scanning system and the fine tracking scanning system. is there. For this reason, when constructing an optical communication system using spatially propagated light, the problem of weight increase is one of the important issues as the vibration compensation means becomes larger.
[0007]
Note that the above problem is not limited to an optical communication system, but is also the same in an optical observation system that uses spatially propagated light, such as an optical ranging system.
[0008]
[Problems to be solved by the invention]
As described above, the conventional vibration compensation means has a problem that it becomes large and heavy.
[0009]
The present invention has been made in view of the above circumstances, and it is possible to realize a highly accurate vibration compensation with a simple configuration, and to promote a reduction in size and weight, and to compensate for the vibration of spatially propagated light. An object is to provide an apparatus.
[0010]
[Means for Solving the Problems]
According to the present invention, two or more reflecting mirrors are arranged in combination on the same optical path where spatially propagated light is incident so that the angle in the biaxial direction can be adjusted, and between the two or more reflecting mirrors. Based on the first beam splitter that is arranged and distributes the spatially propagated light reflected at the front stage and guides one light to the reflector at the rear stage, and the other light distributed by the first beam splitter. First light detection means for detecting the light position of the spatial propagation light, and the optical position adjustment means for guiding the spatial propagation light to the first beam splitter based on the light position detected by the first light detection means A first reflecting mirror adjusting means for controlling the angle of the reflecting mirror and a light reflected by the last stage of the two or more reflecting mirrors, and guiding one of the lights to the spatial propagation light receiving unit. Distributed by two beam splitters and this second beam splitter. A second light detecting means for detecting the light position based on the other light, and the angle of the last reflecting mirror of the light position adjusting means based on the light position detected by the second light detecting means. And a second reflecting mirror adjusting means configured to constitute a vibration compensation device for spatially propagating light.
[0011]
According to the above configuration, the light position adjusting means includes two or more reflecting mirrors, the angles of which are independently adjusted via the first and second reflecting mirror adjusting means, respectively, so that the light in the biaxial direction of the spatially propagated light By controlling the position, the vibration applied to the spatially propagated light is compensated. As a result, high-accuracy spatial propagation of spatially propagated light can be realized with a simple configuration that can be reduced in size and weight.
[0012]
Also, according to this, it becomes possible to realize high-accuracy reception of spatially propagated light without improving the performance of a spatially propagated light receiving system in an optical communication system or the like. Contributes to the promotion of weight reduction.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0014]
FIG. 1 shows a vibration compensating device for spatially propagating light according to an embodiment of the present invention. A first reflecting mirror 10 is disposed on an optical path of an optical antenna (not shown), and this optical antenna (not shown) is shown. For example, transmitted from an optical communication partner and propagated through the space and received. The first reflecting mirror 10 is provided so as to be adjustable in angle in one of two axial directions perpendicular to the optical path and perpendicular to each other, and the first beam splitter 11 is disposed on the reflecting path. Is done.
[0015]
A first optical coupler 12 is disposed on the reflection path of the first beam splitter 11, and a first photodetector 13 is connected to the output end of the first optical coupler 12. . And the calculation part 14 which memorize | stores the reference position information of space propagation light is connected to the output terminal of this 1st photodetector 13, for example.
[0016]
When the light reflected by the first beam splitter 11 is input via the first optical coupler 12, the first photodetector 13 detects the light position of the light and detects the light position. Information is output to the calculation unit 14. The calculation unit 14 generates a first reflecting mirror drive signal based on the input optical position information from the first photodetector 13 and controls the angle of the first reflecting mirror 10.
[0017]
A second reflecting mirror 15 is disposed on the transmission path of the first beam splitter 11. The second reflecting mirror 15 is provided such that the angle of the second reflecting mirror 15 can be adjusted with respect to the other of the two axes orthogonal to the optical path, and the second beam splitter 16 is disposed on the reflecting path.
[0018]
A second optical coupler 17 is disposed on the reflection path of the second beam splitter 16, and a second optical detector 18 is connected to the output end of the second optical coupler 17. . The calculation unit 14 is connected to the output end of the second photodetector 18. When the light reflected by the second beam splitter 16 is input via the second optical coupler 17, the second photodetector 18 detects the light position of this light, and the light position information. Is output to the calculation unit 14. The calculation unit 14 generates a second reflecting mirror drive signal based on the input optical position information from the second photodetector 18 and controls the angle of the second reflecting mirror 15.
[0019]
Further, on the transmission path of the second beam splitter 16, for example, an optical receiver of an optical communication device (not shown) is disposed.
[0020]
In the above configuration, the spatially propagated light received by the optical antenna (not shown) is reflected by the first reflecting mirror 10 and guided to the first beam splitter 11, and the reflection path of the first beam splitter 11. A part of the signal is input to the first optical coupler 12 via. The first optical coupler 12 outputs the input light to the first photodetector 13. The first photodetector 13 detects the optical position of the input light and outputs the optical position information to the calculation unit 14.
[0021]
The calculation unit 14 obtains a displacement in one axial direction of two axes orthogonal to the optical path of the spatial propagation light based on the input light position information, and generates a first reflector driving signal based on the displacement. The angle of the first reflecting mirror 10 is controlled.
[0022]
At the same time, the spatially propagated light reflected by the first reflecting mirror 10 enters the second reflecting mirror 15 via the transmission path of the first beam splitter 11 and is reflected by the second reflecting mirror 15. To the second beam splitter 16.
[0023]
The second beam splitter 16 reflects a part of the incident light and guides it to the second optical coupler 17. The second optical coupler 17 outputs the input light to the second photodetector 18. The second photodetector 18 detects the optical position of the input light and outputs the optical position information to the calculation unit 14.
[0024]
The calculation unit 14 obtains a displacement in the other axial direction of the two axes orthogonal to the optical path of the spatial propagation light based on the input light position information, and generates a second reflector driving signal based on the displacement. The angle of the second reflecting mirror 15 is controlled to compensate for the biaxial vibration of the spatially propagating light.
[0025]
The spatially propagated light reflected by the second reflecting mirror 15 is transmitted through the transmission path of the second beam splitter 16 to be spatially propagated and transmitted to the optical receiver (not shown).
[0026]
As described above, the vibration compensating device for spatially propagating light has the first and second reflecting mirrors 10 and 15 arranged in the optical path of the spatially propagating light so that the angle can be adjusted around two axes orthogonal to the optical path. The first and second beam splitters 11 and 16 are arranged at the subsequent stage of the first and second reflecting mirrors 10 and 15, and the spatially propagated light is distributed by the first and second beam splitters 11 and 16. Thus, by controlling the angles of the first and second reflecting mirrors 10 and 11 based on the light position of the distributed light, the spatial propagation that compensates for the biaxial vibration applied to the spatially propagated light is realized. Configured to do.
[0027]
According to this, a displacement around two axes of spatially propagated light is detected, and the angle of the first and second reflecting mirrors 10 and 15 is controlled based on each displacement to realize compensation of vibration around the two axes. By doing so, the miniaturization and weight reduction can be promoted as much as possible.
[0028]
In addition, according to this, since the propagation accuracy of the spatial propagation light can be improved, it is possible to receive the spatial propagation light with high accuracy without improving the performance of the spatial propagation light receiving system in the optical communication system or the like. This contributes to the promotion of downsizing and weight reduction of optical communication devices.
[0029]
In the above embodiment, the description has been given of the case where the two reflecting mirrors of the first and second reflecting mirrors 10 and 15 are provided to compensate for the biaxial vibration of the spatially propagated light. However, the present invention is not limited to this, and it is also possible to provide two or more reflecting mirrors so as to compensate for biaxial vibration of spatially propagated light.
[0030]
In the above embodiment, the case where the present invention is applied to an optical communication system has been described. However, the present invention is not limited to this, and can also be applied to an optical observation system such as an optical ranging system using spatially propagated light. Yes, the same effect is expected.
[0031]
Therefore, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.
[0032]
【The invention's effect】
As described above in detail, according to the present invention, a vibration compensation device for spatially-propagating light, which can realize a highly accurate vibration compensation with a simple configuration and can promote a reduction in size and weight. Can be provided.
[Brief description of the drawings]
FIG. 1 is a block diagram showing the configuration of a spatially-propagating light vibration compensation device according to an embodiment of the present invention.
[Explanation of symbols]
10: First reflecting mirror.
11: First beam splitter.
12: First optical coupler.
13 ... 1st photodetector.
14: Calculation unit.
15 ... Second reflecting mirror.
16: Second beam splitter.
17 ... 2nd optical coupler.
18: Second photodetector.

Claims (3)

A light position adjusting means in which two or more reflecting mirrors are combined and arranged on the same optical path where spatially propagated light is incident so that the angle in the biaxial direction can be adjusted;
A first beam splitter disposed between the two or more reflecting mirrors, distributing the spatially propagated light reflected in the previous stage and guiding one light to the reflecting mirror in the subsequent stage;
First light detecting means for detecting the light position of the spatially propagated light based on the other light distributed by the first beam splitter;
First reflecting mirror adjusting means for controlling the angle of the reflecting mirror of the light position adjusting means for guiding spatially propagated light to the first beam splitter based on the light position detected by the first light detecting means;
A second beam splitter that distributes the light reflected at the final stage of the two or more reflecting mirrors and guides one of the lights to the spatially-propagating light receiving unit;
Second light detection means for detecting a light position based on the other light distributed by the second beam splitter;
Spatial propagation light, comprising: second reflecting mirror adjusting means for controlling the angle of the last reflecting mirror of the light position adjusting means based on the light position detected by the second light detecting means. Vibration compensation device. 2. The apparatus for compensating for vibration of spatial propagation light according to claim 1, wherein the spatial propagation light is received by an optical antenna, is then spatially propagated, and is guided to a first-stage reflecting mirror of the optical position adjusting means. The first and second reflecting mirror adjusting means controls the angle of the reflecting mirror of the light position adjusting means based on preset position information and the light position detected by the first and second light detecting means. The vibration compensation apparatus for spatially propagating light according to claim 1 or 2.

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