WO2022186114A1 - Dispositif de transmission optique - Google Patents

Dispositif de transmission optique Download PDF

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Publication number
WO2022186114A1
WO2022186114A1 PCT/JP2022/008183 JP2022008183W WO2022186114A1 WO 2022186114 A1 WO2022186114 A1 WO 2022186114A1 JP 2022008183 W JP2022008183 W JP 2022008183W WO 2022186114 A1 WO2022186114 A1 WO 2022186114A1
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Prior art keywords
light
optical system
communication
optical
receiving
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PCT/JP2022/008183
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English (en)
Japanese (ja)
Inventor
悠 宮島
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キヤノン株式会社
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Publication of WO2022186114A1 publication Critical patent/WO2022186114A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
    • H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
    • H04B10/077—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using a supervisory or additional signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum

Definitions

  • the present invention relates to optical transmission devices that are arranged facing each other at a distance and transmit and receive light to transmit information.
  • An optical transmission device consists of a light projecting part that transmits communication light and a light receiving part that receives communication light. In order to perform communication, it is necessary to align the optical axes of the optical system of the light-projecting section and the optical system of the light-receiving section.
  • Optical transmission measures have the problem that communication becomes unstable due to changes in the direction and divergence of communication light due to vibrations at the installation site, atmospheric fluctuations, environmental temperature changes, etc.
  • Patent Document 1 a movable lens that is movable in a plane substantially perpendicular to the optical axis of a light receiving optical system and a light beam separation element that separates communication light and detection light are provided at the subsequent stage, and the direction of the communication light is determined by the detection light.
  • a technique for stabilizing communication is disclosed by confirming the amount of change in and correcting the direction of communication light using a movable lens that is a correction optical element.
  • Patent Document 1 has the following problems. Since the beam separation element for separating the communication light and the detection light is provided on the side of the detection light receiving part of the movable lens that adjusts the direction of the communication light, the optical axis direction of the light receiving optical system is increased by the amount of the light separation element provided. becomes longer. In addition, since the optical path of the detection light is folded back at an angle of 90° with respect to the optical axis of the light receiving optical system, the detection light receiving section and the communication light receiving section face different directions and are separated from each other. It gets complicated.
  • the object of the present invention is to solve the above problems and provide an optical transmission device capable of separating detection light for correcting an optical system with a compact and simple structure.
  • An optical transmission apparatus for achieving the above object is provided by: a light projecting section including first emitting means for emitting communication light; a light projecting optical system; a light receiving optical system; 1.
  • An optical transmission apparatus for achieving the above object is provided by: a light projecting section including first emitting means for emitting communication light; a light projecting optical system; a light receiving optical system; 1.
  • the second light receiving means that receives the detection light that has passed through the light projecting optical system, and the second light receiving means, and a control unit for controlling the correction optical system.
  • FIG. 1 is a configuration diagram of an optical transmission device according to an embodiment
  • FIG. 3 is a detailed configuration diagram of a light projecting section
  • FIG. 4 is an enlarged view of a main portion of a light projecting section
  • 3 is a detailed configuration diagram of a light receiving unit
  • FIG. FIG. 2 is an enlarged view of a main portion of a light receiving portion
  • FIG. 4 is a longitudinal aberration diagram for a wavelength of 1550 nm when the light receiving optical system is focused at infinity.
  • FIG. 4 is a lateral aberration diagram for a wavelength of 1550 nm when the light receiving optical system is focused at infinity.
  • FIG. 1 is a schematic configuration diagram of a spatial optical transmission device (optical transmission device) showing an embodiment of the present invention. Although the description is for one-way communication, the same is true for reverse-direction communication.
  • the communication light transmitted from the spatial optical transmission device 1000 on the transmitting side is received by the spatial optical transmission device 2000 on the receiving side at a distance, and communication is performed.
  • the spatial optical transmission device 1000 on the transmitting side has a configuration in which the light projecting section 100 for emitting communication light is mounted on the angle adjustment table 101, and the direction of the light projecting section 100 can be adjusted on two axes.
  • the spatial optical transmission device 2000 on the receiving side has a configuration in which a light receiving unit 200 for receiving communication light is mounted on an angle adjustment table (angle adjusting unit) 201, and the direction of the light receiving unit 200 can be adjusted on two axes.
  • angle adjustment table angle adjusting unit
  • the angle adjustment base 101 and the angle The angle is adjusted by the adjustment base 201 . This ensures communication once.
  • the free-space optical transmission devices 1000 and 2000 are continued to be used as they are, atmospheric fluctuations, vibrations of members (not shown) holding the angle adjustment base 101 and the light receiving optical system 220, environmental temperature fluctuations, and the like may occur. As a result, the optical path of the communication light fluctuates, and the communication becomes unstable. Therefore, fluctuations in the communication light are grasped by the transmission light detection unit of the light projection unit 100 and the reception light detection unit of the light reception unit 200 (composed of a transmission wedge prism 231 and a position detection sensor 232, which will be described later). Then, the optical path of the communication light is corrected to stabilize the communication. Specifically, the transmission light control unit (control unit) 140 and the focus mechanism (correction optical system, both of which are not shown in FIG.
  • the control unit 240 and an image blur correction mechanism (correction optical system, both of which are not shown in FIG. 1) in the light receiving optical system 220 correct the optical path of the communication light and stabilize the communication.
  • FIG. 2A is a detailed configuration diagram of the light projecting unit 100.
  • the light projecting section 100 includes communication light emitting means (first emitting means, second emitting means) 110, a light projecting optical system 120, a transmission light detection section, a transmission light control section 140, and a holding section 150 (not shown).
  • a communication light emitting means (ejecting means) 110 emits communication light
  • a light projecting optical system 120 substantially parallelizes the communication light emitted from the communication light emitting means 110 and transmits the collimated light.
  • the transmitted light detection section detects the state of the communication light transmitted from the projection optical system 120, and the transmitted light control section 140 controls the communication light.
  • the communication light emitting means 110 is an optical fiber, and emits communication light with a wavelength of 1540 nm to 1560 nm incident from the other end (not shown).
  • Communication light receiving means (first light receiving means) 210 (not shown in FIG. 2A), which will be described later, is also an optical fiber, and receives communication light at the other end (not shown).
  • the spatial optical transmission device 1000 on the transmitting side and the spatial optical transmission device 2000 on the receiving side have substantially the same structure, and if the direction of the communication light in the optical fiber is reversed, the relationship between transmission and reception is reversed. become. Thereby, two-way communication is established.
  • the projection optical system 120 has a lens 121 , a lens 122 , a lens 123 , a secondary mirror (reflective curved surface) 124 and a primary mirror (reflective curved surface) 125 .
  • the lens 121 has an image blur correction mechanism (correction optical system, double-lined frame in the drawing), and can finely adjust the direction of communication light by shifting in a direction perpendicular to the optical axis.
  • the optical system of the image blur correction mechanism is a transmissive member that can change its position and inclination in order to change the direction of communication light.
  • the lens 123 has a focus mechanism (correction optical system, double-lined frame in the figure), and by shifting in the optical axis direction, it is possible to finely adjust the degree of divergence of the communication light.
  • the primary mirror 125 has an opening with a diameter of 30 mm at its center.
  • the optical system of the focus mechanism is a transmissive member whose position and inclination can be changed in order to change the degree of divergence of communication light.
  • the transmitted light detector is composed of reflecting prisms 131a and 131b that return part of the transmitted communication light, and position detection sensors (second light receiving means) 132a and 132b that detect the imaging positions of the returned light flux. be done.
  • FIG. 2B is an enlarged view of the reflecting prisms 131a and 131b.
  • the communication light is shifted by 0.2° and folded back (180.2° with respect to the original direction).
  • the folded light rays enter the light projecting optical system 120 again and are condensed on the position detection sensors 132a and 132b located at different positions from the communication light emitting means 110 because they are shifted by 0.2° as described above. be done.
  • the direction of the light beam can be calculated from the imaging positions (information) detected by the position detection sensors 132a and 132b.
  • the reflecting prisms 131a and 131b are installed so as to reflect the communication light within a range of 1 mm at each end of the communication light beam and within a range of 5 mm in the circumferential direction around the optical axis in one cross section including the optical axis. , the divergence of the communication light can be calculated from the directions (information) of the light rays at both ends.
  • the position detection sensors 132a and 132b have wavelength selection filters, and the light having the wavelength of the detection light emitted by the communication light emission means 110 of the spatial light transmission device 1000 is transmitted therethrough. Light at the wavelength of the communication light or sensing light coming from device 2000 is blocked. Such a configuration reduces erroneous detection due to stray light.
  • the wavelength of the detection light is the same as the wavelength of the communication light.
  • the transmission light control unit 140 is connected to the position detection sensors 132a and 132b and performs the above calculations. Moreover, the calculation result is fed back to the focus mechanism of the projection optical system 120 .
  • the holding part 150 (not shown) has a replaceable holding member 151 and a fixed holding member 152 .
  • the communication light emitting means 110 , the position detection sensors 132 a and 132 b that are part of the transmission light detection section, and the transmission light control section 140 are held by a replaceable holding member 151 .
  • the projection optical system 120 and the reflecting prisms 131 a and 131 b that are part of the transmitted light detection section are held by a fixed holding member 152 together with a dustproof glass 153 .
  • the detachable portion 151a of the exchangeable holding member 151 and the detachable portion 152a of the fixed holding member 152 are detachable.
  • the control signal from the transmission light control unit 140 is transmitted to the light projection optical system 120 by signal transmission/reception by a mechanism (electrical contact, optical coupling, etc.) configured in the attachment/detachment unit 151a and the attachment/detachment unit 152a. is transmitted to the focusing mechanism.
  • the fixed holding member 152 is held by the angle adjustment table 101 , whereby the spatial optical transmission device 1000 is placed on the angle adjustment table 101 .
  • FIG. 3A is a detailed configuration diagram of the light receiving unit 200 on the receiving side.
  • the light receiving unit 200 includes a light receiving optical system 220 for receiving and condensing communication light, a communication light receiving means 210 for receiving the communication light collected by the light receiving optical system 220, and a received light for detecting the state of the received communication light. It has a detection section, a received light control section 240 for controlling communication light, and a holding section.
  • the holding portion is composed of a replaceable holding member (light receiving means holding member) 251 and a fixed holding member (optical system holding member) 252 .
  • the light receiving optical system 220 has a primary mirror (reflective curved surface) 225 , a secondary mirror (reflective curved surface) 224 , lenses 223 , 222 and 221 .
  • the lens 221 has an image blur correction mechanism (double frame in the figure), and by shifting in a direction perpendicular to the optical axis, the direction of communication light can be adjusted.
  • the lens 223 has a focus mechanism (double frame in the drawing), and by shifting it in the optical axis direction, it is possible to finely adjust the degree of divergence of the communication light.
  • the primary mirror 225 has an opening with a diameter of 30 mm at its center.
  • the communication light receiving means 210 is an optical fiber as described above, and receives communication light at the other end (not shown).
  • the spot diameter of the communication light condensed by the light receiving optical system 220 is 44 ⁇ m for the core diameter of the optical fiber of the communication light receiving means 210 of 50 ⁇ m. ing.
  • the communication light receiving means 210 is arranged on the optical axis of the light receiving optical system 220 .
  • the received light detection unit includes a transparent wedge prism 231 that refracts part of the incoming communication light, and a position detection sensor (second light receiving means) 232 that detects the imaging position of the refracted light beam. Consists of
  • FIG. 3B is an enlarged view of the transmission wedge prism 231.
  • the refracted light beam enters the light receiving optical system 220 and is condensed on the position detection sensor 232 located at a different position from the communication light receiving means 210 because of the 0.2° deviation described above.
  • the direction of the light beam can be calculated from the imaging position (information) detected by the position detection sensor 232 .
  • the transmission wedge prism 231 is installed so as to refract the communication light within a range of 3 mm at one end of the communication light and 5 mm in the circumferential direction around the optical axis in one cross section including the optical axis. From the ray orientation, the angle of arrival of the communication light can be calculated.
  • the position detection sensor 232 has a wavelength selection filter, and the light having the wavelength of the detection light emitted by the communication light emitting means 110 of the spatial light transmission device 1000 passes through and comes from the other space light transmission device 2000. Light of the wavelength of the communication light or detection light is blocked. Such a configuration reduces erroneous detection due to stray light.
  • the wavelength of the detection light is the same as the wavelength of the communication light.
  • the received light control unit 240 is connected to the position detection sensor 232 and performs the above calculations. Further, the calculation result is fed back to the image blur correction mechanism of the light receiving optical system 220 and the angle adjustment base 201 (the adjustment portion is indicated by a double-lined frame in the drawing). Specifically, when the fluctuation of the corrected angle of the communication light is low frequency, the angle adjustment table 201 corrects it, and when it is high frequency, the image blur correction mechanism of the light receiving optical system 220 corrects it.
  • a holding portion that holds the light receiving portion is composed of a replaceable holding member 251 and a fixed holding member 252 .
  • the communication light receiving means 210 and the position detection sensor 232 which is part of the received light detection section are held by a replaceable holding member 251 .
  • the light receiving optical system 220 , the transmission wedge prism 231 that is part of the received light detection section, and the received light control section 240 are held by a fixed holding member 252 together with a dustproof glass 253 .
  • the detachable portion 251a of the exchangeable holding member 251 and the detachable portion 252a of the fixed holding member 252 are detachably connected.
  • the control signal from the reception light control unit 240 is transmitted to and received from the light receiving optical system 220 by a mechanism (electrical contact, optical coupling, etc.) configured in the attachment/detachment part 151a and the attachment/detachment part 152a, which is capable of sending and receiving signals. It is transmitted to the focus mechanism and the angle adjustment base 201 .
  • the fixed holding member 252 is held by the angle adjustment table 201 , whereby the spatial optical transmission device 2000 is placed on the angle adjustment table 201 .
  • the communication light emitting means 110 also serves as a detection light emitting section. Also, for the sake of clarity, it should be noted that the "communication light” discussed thus far includes detection light as well as light that communicates.
  • Communication light is redefined as “optical communication light for communication” or "light that contributes to communication”, and is considered separately from detection light.
  • Communication light is light emitted from the projection optical system 120 without being reflected by the reflecting prisms 131a and 131b
  • detection light is light reflected by the reflecting prisms 131a and 131b.
  • the luminous flux areas of the communication light and the detection light can be roughly calculated as follows when they are emitted from the projection optical system 120 (cross section perpendicular to the optical axis where the reflecting prisms 131a and 131b are arranged).
  • the area of the light beams reflected and separated by the reflecting prisms 131a and 131b is smaller than the area of the light beams not separated by the reflecting prisms 131a and 131b.
  • the area of the light beams reflected and separated by the reflecting prisms 131a and 131b is smaller than the area of the light beams not separated by the reflecting prisms 131a and 131b.
  • optical detailed values of the light receiving optical system 220 are shown below.
  • the optical details of the projection optics 120 are also similar.
  • surface number i which is the order of surfaces (optical surfaces) from the object side
  • r is the radius of curvature of the i-th surface from the object side
  • d is the i-th surface from the object side. It shows the interval (on the optical axis) of the (i+1)th surface.
  • nd and ⁇ d represent the refractive index and Abbe number of the medium (optical member) between the i-th surface and the (i+1)-th surface.
  • the symbol * attached to the right of the surface number indicates that the surface is an aspherical surface.
  • the aspheric shape is expressed by the following equation, where the X axis is in the direction of the optical axis, the H axis is in the direction perpendicular to the optical axis, the traveling direction of light is positive, R is the paraxial radius of curvature, and K is the conic constant. Also, “eZ” means “ ⁇ 10 ⁇ Z ”.
  • a solid line and a dotted line in the astigmatism diagram of the longitudinal aberration diagram and the lateral aberration diagram show aberrations on the meridional image plane and the sagittal image plane, respectively.
  • spherical aberration is drawn on a scale of 0.4 mm
  • astigmatism is drawn on a scale of 0.4 mm
  • distortion is drawn on a scale of 5%.
  • the lateral aberration diagrams in FIG. Fig. 4 is a lateral aberration diagram at 0.0000 mm;
  • the aberration can be reduced at the central angle of view of the communication light receiving means 210 at the communication wavelength (1540 nm to 1560 nm).
  • the optical performance of the light receiving optical system changes depending on the position and refractive index of the optical element.
  • it is necessary to detect and evaluate changes in the direction and divergence of communication light. I want to pass through the element.
  • the correcting optical element that corrects the direction and divergence of the communication light should be configured so that both the communication light and the detection light pass through so that the direction and divergence of the communication light after correction can also be evaluated. .
  • the correction optical element is an optical element that causes some kind of change in the position, attitude, shape, optical characteristics, etc. for correction such as shifting and tilting operations and changes in the refractive index, it is possible to make the optical element as small as possible. I have a desire to Therefore, the correction optical element is usually arranged near the communication light receiving means and the detection light receiving means, which have a small beam diameter.
  • the beam separating element is arranged closer to the communication light receiving means and the detection light receiving means than the correction optical element located near the communication light receiving means and the detection light receiving means.
  • the detection light is arranged so that the relative angle between the directions of the communication light and the detection light increases in order to separate the communication light and the detection light. The direction is likely to need to be changed by a relatively large amount to change the direction of the detection light.
  • the length of the light-receiving optical system in the optical axis direction is increased by the amount of the light beam separation element provided on the side of the detection light-receiving means of the correction optical element.
  • both communication light and detection light are passed through the same light receiving optical system, and the communication light and the detection light are sent to the subsequent stage (on the side of the second light receiving means) via a movable lens that is a correction optical element.
  • a beam separating element was arranged to set the relative angle to the light at 90°.
  • a light beam separating element that slightly changes the relative directions of the light beams of the communication light and the detection light is arranged in the front stage (opposite to the second light receiving means side) of the correction optical element. Since the relative direction difference is very small, both the communication light and the detection light pass through the light receiving optical system including the correcting optical element. As a result, both the communication light and the detection light are subject to changes in optical performance caused by the positions and refractive indices of the optical elements described above. At this time, since the difference in relative orientation is minute, the size of the beam splitting element can also be reduced.
  • the communication light and the detection light are separated in the vicinity of the communication light receiving means in a state where the relative angle between the directions of the communication light and the detection light is small. easier to do.
  • the communication light receiving means and the detection light receiving means can be oriented substantially in the same direction. At this time, by condensing the communication light and the detection light together in the light receiving optical system, the communication light receiving means and the detection light receiving means are brought closer to each other than when the light is collected by separate optical elements. be done.
  • the transmission wedge prism 231 which is a light beam separating element that separates the communication light and the detection light, is connected to the position detection sensor 232 that receives the detection light. It is arranged at a position farther from the light-receiving part than As a result, there is no need to dispose the light beam separation element closer to the position detection sensor 232 than the lens 221 having the image blur correction mechanism, and a size reduction is achieved as compared with the configuration disclosed in Patent Document 1.
  • a transmission wedge prism 231 that slightly changes the angle of the detection light with respect to the communication light is used as a light beam separating element, and the imaging position after passing through the light receiving optical system 220 is made different from the communication light receiving means 210 .
  • the communication light receiving means 210 for communication light and the position detection sensor 232 which is a light receiving portion for detection light, can be arranged in close proximity in the same direction while separating the light beams. It can be held, and a simple structure is achieved as compared with the configuration of Patent Document 1.
  • the reflecting prisms 131a and 131b are arranged at positions farther from the light receiving section than the lens 121 having a focusing mechanism that adjusts the degree of divergence of the communication light. ing. As a result, there is no need to dispose the light beam separating element on the side of the position detection sensors 132a and 132b from the lens 121 having the focusing mechanism, and miniaturization is achieved.
  • Reflecting prisms 131a and 131b that slightly change the angle of the detection light with respect to the communication light and turn it back are used as light beam splitting elements, and the imaging position after passing through the light projecting optical system 120 is different from the communication light emitting means 110.
  • Reflecting prisms 131a and 131b which are separation units, change the relative directions of the optical paths of the detection light and the communication light that have passed through the light projection optical system 120, and cause the light to enter the light projection optical system.
  • the communication light emitting means 110 for the communication light and the position detection sensors 132a and 132b which are the light receiving units for the detection light, can be arranged in close proximity in the same direction while separating the light beams. It can be held integrally and a simple structure is achieved. With the above configuration, the effects of the present invention can be obtained.
  • the communication light receiving means 210 and the position detection sensor 232 which is part of the received light detection means, are integrally held by the replaceable holding member 251.
  • FIG. Such a configuration facilitates assembly of each unit, and facilitates alignment of the relative positions of the communication light receiving means 210 and the position detection sensor 232 .
  • an image blur correction mechanism is used to move the lenses 121 and 221 in a direction perpendicular to the optical axis. In this way, a low-cost configuration can be achieved by utilizing the technology that has been generalized in cameras and the like.
  • a mechanism for changing the position and angle of a reflecting member such as a MEMS mirror may be used.
  • a reflecting member such as a MEMS mirror
  • the MEMS mirror can be driven at a higher speed than the image blur correction mechanism.
  • correcting the divergence of communication light may not be essential depending on the communication distance of the spatial optical transmission device.
  • the divergence of the projection optical system may change due to environmental temperature changes, vibrations, and the like. If the divergence is deviated from the desired divergence, the luminous flux spreads and the amount of light received by the communication light receiving means decreases. preferred for security.
  • the lens 123 and the lens 223 are used as a focusing mechanism as means for adjusting the degree of divergence of communication light. In this way, a low-cost configuration can be achieved by utilizing the technology that has been generalized in cameras and the like.
  • a transmission member called a transmission wedge prism 231 is used as the detection light separation section of the received light detection section.
  • the detection light separation section of the received light detection section is configured using a transmission member such as the transmission wedge prism 231, but the present invention is not limited to this, and may be configured with a reflection member or a transmission member. I can do it.
  • reflection prisms 131a and 131b are used as reflection members in the detection light separation section included in the transmission light detection section.
  • the direction of the detection light is greatly changed with respect to the communication light (approximately 180° in this embodiment), and the communication light directed toward the reflecting member and the detection light reflected by the reflecting member are relative to each other. It has the effect of securing an appropriate angle.
  • the detection light separation section included in the transmission light detection section is configured with the reflecting prisms 131a and 131b as reflecting members, but the detection light separation section included in the transmission light detection section is configured with either a reflection member or a transmission member. can do
  • part of the communication light emitted from the communication light emitting means 110 is used as the detection light, so the communication light emitting portion and the detection light emitting portion are the same. With such a configuration, the optical paths of the communication light and the detection light become closer, and the optical characteristics of the communication light can be detected more accurately.
  • the luminous flux area of the detection light emitted from the projection optical system 120 is smaller than the luminous flux area of the communication light (here, only contributing to communication).
  • the luminous flux area of the detection light incident on the light receiving optical system 220 is smaller than the luminous flux area of communication light (here, only light that contributes to communication). Normally, even if the amount of detection light is less than that of communication light (here, it refers only to light used for communication), sufficient detection can be performed. By adopting such a configuration, an effect of reducing the size of the detection light separating section is obtained.
  • a plurality of detection light receiving means are provided in one spatial optical transmission device, such as the position detection sensor 232 constituting the received light detection section and the position detection sensors 132a and 132b constituting the transmission light detection section. ing.
  • the characteristics of the communication light can be grasped from many viewpoints, which is preferable for ensuring the stability of communication.
  • the spatial optical transmission device 2000 on the receiving side has been mainly discussed for the purpose of explanation. The same is true for In particular, it should be noted that both devices have a transmitted light detector and a received light detector, although only one side is shown.
  • the reflective prism and the transmissive wedge prism are installed so as to be rotated by 90° around the optical axis (in FIGS. 2A and 3A, the front side of the page).
  • the light emitting optical system and the light receiving optical system of the spatial light transmission device have the same optical axis.
  • the "optical axis" discussed in the present invention means the central optical path of the communication light beam emitted from the emitting means and passing through the light projecting optical system, and the light receiving means passing through the light receiving optical system. It refers to the central optical path of the luminous flux of the communication light heading. Note that the definition is different from the optical axis of a general coaxial optical system. In this embodiment, for the sake of clarity, a mode is assumed in which the emitting means exists on the optical axis of the coaxial light projecting optical system, and the light receiving means exists on the optical axis of the coaxial light receiving optical system.
  • the detection light and the communication light pass through all the optical elements of the light projecting optical system 120 and the light receiving optical system 220 in the same way, but it is not limited to this.
  • the effect of the present invention can be obtained by passing through at least part of the light projecting optical system and the light receiving optical system in the same way.
  • it is preferable for the stability of communication that the number of optical elements that are similarly routed is as large as possible.
  • the detection light and the communication light may pass through different optical elements as the light projecting optical system and the light receiving optical system.
  • both the reflective optical element and the transmissive optical element are used in the light projecting optical system 120 and the light receiving optical system 220, but the invention is not limited to this, and only the reflective optical element, only the transmissive optical element, etc. may consist of
  • part of the communication light emitted from the communication light emitting means 110 is used for detection, but it is not limited to this.
  • a dedicated detection light may be used, for example, a light having a wavelength different from that of the communication light may be incident from the other end (not shown) of the optical fiber of the communication light emitting means 110 and used as the detection light.
  • the communication light emitted from the optical fiber is received by the optical fiber, but the present invention is not limited to this.
  • the communication light emitted from the semiconductor laser may be received by the sensor.
  • a position detection sensor is used as the detection light receiving means, but the present invention is not limited to this, and a two-dimensional sensor, a light amount detection sensor, or the like may be used.

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  • Engineering & Computer Science (AREA)
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  • Optical Communication System (AREA)

Abstract

Le but de la présente invention est de fournir un dispositif de transmission optique avec lequel il est possible, à l'aide d'une structure petite et simple, de séparer la lumière de détection pour corriger un système optique. L'invention concerne un dispositif de transmission optique pour effectuer une communication optique entre une unité de projection de lumière et une unité de réception de lumière, l'unité de projection de lumière comprenant un premier moyen d'émission pour émettre une lumière de communication et un système optique de projection de lumière, l'unité de réception de lumière comprenant un système optique de réception de lumière et un premier moyen de réception de lumière pour recevoir la lumière de communication, le dispositif de transmission optique étant caractérisé en ce que l'unité de projection de lumière comprend un second moyen d'émission pour émettre une lumière de détection ; le système optique de réception de lumière comprend un système optique de correction pour changer une caractéristique optique du système optique de réception de lumière ; et l'unité de réception de lumière comprend une unité de séparation pour faire en sorte que la lumière de détection et la lumière de communication soient incidentes sur le système optique de réception de lumière avec les directions relatives du chemin optique de la lumière de détection et du chemin optique de la lumière de communication étant changées ; un second moyen de réception de la lumière pour recevoir la lumière de détection qui a traversé le système optique de réception de la lumière ; et une unité de commande pour commander le système optique de correction sur la base des informations obtenues par le second moyen de réception de la lumière.
PCT/JP2022/008183 2021-03-02 2022-02-28 Dispositif de transmission optique WO2022186114A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2021032365A JP2022133600A (ja) 2021-03-02 2021-03-02 光伝送装置
JP2021-032365 2021-03-02

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040208595A1 (en) * 2002-02-19 2004-10-21 Fai Mok Free space communication system with common optics and fast, adaptive tracking
JP2004349797A (ja) * 2003-05-20 2004-12-09 Victor Co Of Japan Ltd 光無線伝送装置及び光無線伝送装置の光軸調整方法
JP2007511968A (ja) * 2003-11-17 2007-05-10 メディア ラリオ ソシエタ ア レスポンサビリタ リミタータ 光空間通信
JP2007184706A (ja) * 2006-01-05 2007-07-19 Victor Co Of Japan Ltd 光無線伝送装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040208595A1 (en) * 2002-02-19 2004-10-21 Fai Mok Free space communication system with common optics and fast, adaptive tracking
JP2004349797A (ja) * 2003-05-20 2004-12-09 Victor Co Of Japan Ltd 光無線伝送装置及び光無線伝送装置の光軸調整方法
JP2007511968A (ja) * 2003-11-17 2007-05-10 メディア ラリオ ソシエタ ア レスポンサビリタ リミタータ 光空間通信
JP2007184706A (ja) * 2006-01-05 2007-07-19 Victor Co Of Japan Ltd 光無線伝送装置

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