JP2004325927A - Monitoring device of incident light to optical fiber, device equipped with same , and control method of beam steering mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To monitor incident situations of light to an optical fiber with simple constitution. <P>SOLUTION: In this monitoring device, light which is reflected on the incident end face 13 of an optical fiber 12, which is inclined to the optical axis C of the optical fiber 12 are guided to a prescribed direction and these reflected light is received by a 2-dimensional photo sensor 35. Then, incident situation of light to the optical fiber 12 is grasped by whether it is received in which positions on the 2-dimensional photo sensor 35. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an incident light monitoring device that monitors whether light is incident on an optical fiber, a device including the same, and a method of controlling a beam steering mechanism.
[0002]
[Prior art]
In recent years, a technique has been developed in which light of a specific wavelength is extracted from light output from an optical fiber using an inverse dispersion type double spectroscope or the like and the light of the specific wavelength is returned to another optical fiber. ing.
[0003]
In such a technique, when returning light of a specific wavelength to an optical fiber, there is a technique for surely monitoring whether light is incident on the optical fiber.
[0004]
In order to monitor whether light is reliably incident on the optical fiber, for example, a technique described in the following Non-Patent Document 1 or Patent Document 1 can be used.
[0005]
The technology described in Non-Patent Document 1 connects an optical coupler to an optical fiber on which light of a specific wavelength is incident, taps a part of the light incident on the optical fiber with the optical coupler, and partially taps the optical fiber. This is a technology for monitoring light. By using this technique, it is possible to confirm whether light is incident on the optical fiber.
[0006]
In addition, the technique described in Patent Document 1 is a method of detecting a positional shift of an incident beam by attaching, for example, a four-division sensor to an end face of an optical fiber.
[0007]
[Non-patent document 1]
Author Yoshitaka Namihira "DWDM optical measurement technology" Published by Optronics Co., Ltd., published on March 10, 2001 P95
[Patent Document 1]
US 6,483,962B1
[0008]
[Problems to be solved by the invention]
However, when the technology described in Non-Patent Document 1 is used, since a part of the light incident on the optical fiber is used for monitoring, an optical coupler is required for each optical fiber, and the configuration becomes complicated. There are points. In addition, the method described in Patent Literature 1 has a problem that it is difficult to actually manufacture, and a deviation of an incident angle cannot be detected.
[0009]
The present invention focuses on such a problem, and an incident light monitoring device capable of monitoring an incident state to an optical fiber with a simple configuration, an apparatus including the same, a beam steering mechanism using a method of incident light monitoring The purpose of the present invention is to provide a control method.
[0010]
[Means for Solving the Problems]
The incident light monitoring device of the invention according to claim 1 for solving the above problem,
Receiving light reflected from the incident end face (hereinafter, referred to as a monitor surface) of the light reaching the incident end face of the optical fiber, and detecting an incident angle and / or an incident position of the light with respect to the incident end face; It is characterized by.
[0011]
In addition, the incident light monitoring device of the invention according to claim 2 for solving the above problem is characterized in that, of the light directed to the incident end face to enter the incident end face of the optical fiber through the transparent solid medium, It receives light reflected on any one of a light incident surface and a light exit surface (hereinafter, referred to as a monitor surface) of the transparent solid medium disposed in contact with the incident end face or disposed through the medium. Detecting an incident angle and / or an incident angle of light with respect to the incident end face.
[0012]
The incident light monitoring device of the invention according to claim 3 is:
The incident light monitoring device according to any one of claims 1 and 2,
An incident position of light in at least a one-dimensional direction in a plane parallel to the incident end face, and / or an incident angle of light in a plane spreading in at least the one-dimensional direction and perpendicular to the incident end face; Is detected.
[0013]
The incident light monitoring device of the invention according to claim 4 is:
The incident light monitoring device according to any one of claims 1 to 3,
The monitor surface has a reflective film,
A light guide hole for guiding light to a part of the incident end face of the optical fiber where light is to be incident is formed in the reflection film.
[0014]
The incident light monitoring device of the invention according to claim 5 is:
The incident light monitoring device according to any one of claims 1 to 4,
A monitor optical system that guides reflected light from the monitor surface in a predetermined direction, and a light receiving unit that receives light guided by the monitor optical system,
The monitor optical system is an imaging optical system, and the monitor surface and the light receiving surface of the light receiving unit are arranged at optically conjugate positions.
[0015]
The incident light monitoring device of the invention according to claim 6 is:
The incident light monitoring device according to any one of claims 1 to 4,
A monitor optical system that guides reflected light from the monitor surface in a predetermined direction, and a light receiving unit that receives light guided by the monitor optical system,
The monitor optical system is a collimating optical system, and the collimating optical system is disposed such that a focal position is on the monitor surface.
[0016]
The incident light monitoring device according to claim 7,
The incident light monitoring device according to any one of claims 1 to 4,
A monitor optical system that guides reflected light from the monitor surface in a predetermined direction, and a light receiving unit that receives light guided by the monitor optical system,
The monitor optical system includes an optical path splitting unit that splits an optical path of light reflected from the monitor surface, an imaging optical system that is disposed in one of the optical paths split by the optical path splitting unit, and an optical path splitting unit. A collimate optical system arranged on the other of the divided optical paths,
The light receiving unit has a first light receiving unit that receives light that has passed through the imaging optical system, and a second light receiving unit that receives light that has passed through the collimate optical system,
The imaging optical system is arranged such that the monitor surface and the light receiving surface of the first light receiving unit are conjugate positions, and the collimating optical system is arranged such that a focal position is on the monitor surface. Are arranged.
[0017]
The optical transmission device according to claim 8 for solving the problem,
An incident monitor device according to any one of claims 1 to 7, comprising: the optical fiber; and a beam steering mechanism for adjusting a position and / or an incident angle of incident light with respect to the optical fiber,
The beam steering mechanism adjusts an incident position and / or an incident angle of the light on the optical fiber according to an incident angle and / or an incident angle of the light on the optical fiber detected by the incident light monitoring device. Features.
Optical transmission device.
[0018]
A method for controlling a beam steering mechanism according to claim 9 for solving the above problem is as follows.
Of the light directed to the optical fiber, the light incident surface of the optical fiber, the light incident surface of a transparent solid medium disposed in contact with the light incident surface or disposed via the medium, and the light incident surface of the transparent solid medium. Receiving the light reflected by any one of the light exit surfaces,
The beam steering mechanism is adjusted based on light reception information obtained as a result of light reception.
[0019]
According to another aspect of the present invention, there is provided a method for controlling a beam steering mechanism.
At least one of an incident end face of the optical fiber, a light incident face of the transparent solid medium disposed in contact with the incident end face or disposed through the medium, and a light emitting face of the transparent solid medium. While applying a reflection film in advance, a light guide hole for guiding light is formed in advance in a portion of the reflection film where light is to be incident,
Of the light directed to the optical fiber, receiving light reflected from the reflective film,
The beam steering mechanism is adjusted based on light reception information obtained as a result of light reception.
[0020]
Further, another incident light monitoring device for solving the above problem,
In an incident light monitoring device that monitors an incident state of light on an optical fiber whose incident end face is inclined with respect to the fiber optical axis,
A monitor optical system for guiding light reflected on an incident end face (hereinafter referred to as a monitor surface) of the optical fiber in a predetermined direction, and a light receiving surface for spreading the light guided by the monitor optical system at least one-dimensionally And a light-receiving means for receiving the light at (1).
[0021]
Further, still another incident light monitoring device for solving the above problem,
An optical fiber in which light is incident through a transparent solid medium, the incident end face of which is inclined with respect to the optical axis of the fiber, and the incident end face is in contact with the transparent solid medium, or the transparent solid medium. In an incident light monitoring device that monitors the incident state of light to an optical fiber that is in contact with the incident end face via a medium,
A reflecting material is applied to any one of a light incident surface of the optical fiber, a light incident surface of the transparent solid medium, and a light emitting surface of the transparent solid medium (hereinafter, a monitor surface),
In the reflective material, a light guide hole for guiding light to a portion where light is to be incident on the incident end face of the optical fiber is formed,
A monitor optical system that reflects light on the monitor surface on which the reflective material is applied and guides light emitted from the transparent solid medium in a predetermined direction; and a light guided by the monitor optical system, at least one-dimensionally. Light-receiving means for receiving light on the light-receiving surface that spreads.
[0022]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, various embodiments of the optical transmission device according to the present invention will be described with reference to the drawings.
[0023]
First, a first embodiment of an optical transmission device according to the present invention will be described with reference to FIGS.
[0024]
As shown in FIG. 2, the optical transmission device according to the present embodiment includes an optical fiber bundle 10 including one input optical fiber 11 and a plurality of output optical fibers 12, 12,. An inverse dispersion double spectroscope 20 that guides light of a specific wavelength of the light to the output optical fiber 12 and an incident light monitoring device 30 that monitors the state of light incident on the output optical fiber 12 are provided. .
[0025]
The inverse dispersion double spectrometer 20 guides the light from the input optical fiber 11 to the diffraction grating 21, the MEMS (Micro Electro Mechanical System) 22, and the light from the input optical fiber 11 to the diffraction grating 21. An optical system 25 that guides the light that has passed through the diffraction grating 21 to the MEMS 22 and then guides the light to the output optical fibers 12 and 12 a via the diffraction grating 21.
[0026]
The MEMS 22 has a micromirror array 23 in which a plurality of micromirrors are arranged one-dimensionally, and a mirror driver 24 for individually driving each micromirror constituting the micromirror array 23. Each micromirror is a plane mirror of the same size, and its size is about several tens μm to several hundred μm square. The MEMS 22 functions as a beam steering mechanism, and adjusts a light incident position on the output optical fiber 12 according to a signal from the incident light monitoring device 30 as described later.
[0027]
The inverse dispersion double spectroscope 20 splits the light from the input optical fiber 11 by the diffraction grating 21, and the light in each wavelength range of the split light corresponds to the wavelength range of the micromirror array 23. Are reflected by the respective micromirrors, and are incident on a desired output optical fiber 12 among the plurality of output optical fibers 12, 12,... Via the optical system 25 and the diffraction grating 21. FIG. 2 exemplifies only the optical path of one of the wavelength ranges separated by the diffraction grating 21.
[0028]
As shown in FIG. 1, the incident light monitoring device 30 receives a light guided by the monitor optical system and a monitor optical system for guiding the reflected light from the incident end face 13 of the output optical fiber 12 in a specific direction. A two-dimensional light receiving sensor 35.
[0029]
Generally, the end face 13 of the optical fiber is not cut at 90 ° with respect to the fiber optical axis C, and in order to prevent return due to reflection from the end face 13, (90 + α ) ° cut. This α ° is, for example, about 8 °. The monitor optical system captures the reflected light from the incident end face 13 inclined with respect to the fiber optical axis C and guides the reflected light to the two-dimensional light receiving sensor 35. The monitor optical system includes an imaging optical system 31. The incident end face 13 of the output optical fiber 12 serving as a monitor surface and the light receiving surface of the two-dimensional light receiving sensor 35 are disposed at positions optically conjugate with respect to the imaging optical system 31.
[0030]
The two-dimensional light receiving sensor 35 has a plurality of light receiving elements arranged two-dimensionally, and among the plurality of light receiving elements, the light receiving element that receives light converts an electric signal corresponding to the amount of received light into an inverse dispersion double spectrometer. 20 to the mirror driver 24. That is, the two-dimensional light receiving sensor 35 outputs a signal indicating at which position and how much light is received. The mirror driver 24 of the inverse dispersion double spectroscope 20 drives the micro mirror array based on the output signal.
[0031]
For example, it is assumed that light A having a specific wavelength is emitted from the inverse dispersion double spectroscope 20 to the incident end face 13 of the output optical fiber 12. Part of the light A enters the output optical fiber 12, and the other part is reflected by the incident end face 13, and illuminates a certain position on the two-dimensional light receiving sensor 35 by the imaging optical system 31. When receiving the light A from the incident end face 13, the two-dimensional light receiving sensor 35 sends a signal indicating which position and how much light has been received to the mirror driver 24 of the inverse dispersion double spectroscope 20 as described above. Output. The mirror driver 24 stores the target light receiving pattern in advance, compares the light receiving pattern indicated by the signal from the two-dimensional light receiving sensor 35 with the target light receiving pattern, and responds to the deviation of the actual light receiving pattern from the target light receiving pattern. , The driving amount of the micromirror array is determined. As a result, the light from the inverse dispersion double spectroscope 20 can be accurately made incident on the intended output optical fiber 12.
[0032]
As described above, in the present embodiment, the reflected light from the input end face 13 of the output optical fiber 12, which is originally discarded light, is monitored, so that the light incident on the output optical fiber is damaged. Never. Moreover, since only the reflected light from the input end face 13 is monitored, there is no need to provide an optical coupler on the optical fiber, and the configuration of the device can be simplified and the cost of the device can be reduced.
[0033]
Next, an optical transmission device according to a second embodiment of the present invention will be described with reference to FIGS.
[0034]
The optical transmission device of the present embodiment also includes an optical fiber bundle, an inverse dispersion double spectroscope, and an incident light monitoring device 30a, as in the first embodiment.
[0035]
As shown in FIG. 3, a transparent solid medium 26 is in close contact with the input end face 13 of the output optical fiber 12 of the present embodiment via a refractive index matching medium 29. In this transparent solid medium 26, both the optical fiber bundle side surface 27a and the inverse dispersion double spectroscope side surface 27b are flat-polished. The transparent solid medium 26 extends in the direction in which the optical fiber bundles (not shown) are arranged, and the input end faces of the plurality of output optical fibers and the output end faces of the input optical fibers also It is in close contact with the bundle side surface 27a via a refractive index matching medium 29. When the light enters the transparent solid medium 26 from the output end face of the input optical fiber, and when the light enters the input optical fiber 12 from the transparent solid medium 26, the refractive index matching medium 29 loses a light amount due to reflection or the like. Is used to make it as small as possible.
[0036]
Of the optical fiber bundle side surface (light emitting surface) 27a of the transparent solid medium 26, a portion excluding a target portion 28a through which light from the transparent solid medium 26 passes to the output optical fiber 12, in other words, the core of the output optical fiber 12 Except for the portion 28a corresponding to the end face 14, a back reflection film 28 is provided. For this reason, the target portion 28 a through which light to the output optical fiber 12 passes is optically transparent in a pinhole shape, and most of the light that reaches the target portion enters the core of the output optical fiber 12. On the other hand, most of the light that has reached around the pinhole 28a is reflected by the back reflection film 28.
[0037]
Light from the input optical fiber enters the inverse dispersion double spectroscope via the transparent solid medium 26, and only the light of a specific wavelength is extracted by the inverse dispersion double spectroscope. From the inverse dispersion double spectroscope, the light of the specific wavelength enters the output optical fiber 12 via the transparent solid medium 26.
[0038]
The incidence monitor device 30a monitors the state of incidence of light on the output optical fiber 12. This incident monitor device 30a also has an imaging optical system and a two-dimensional light receiving sensor 35 as shown in FIGS. 3 and 4, as in the first embodiment. The imaging optical system has a microlens 31b attached to the inverse dispersion double spectroscope side surface 27b of the transparent solid medium 26. In this embodiment, the optically conjugate position with the light receiving surface of the two-dimensional light receiving sensor 35 with respect to the imaging optical system 31b is the reflecting surface of the reflecting film 28 serving as the monitor surface, that is, the transparent solid medium 26. Of the optical fiber bundle 27a.
[0039]
Similarly to the first embodiment, the incident monitor device 30a receives the reflected light from the reflective film 28, which is the monitor surface, by the two-dimensional light receiving sensor 35, and outputs a signal corresponding to the received position and the light amount.
[0040]
When receiving the signal from the two-dimensional light receiving sensor 35, the mirror driver 24 compares the light receiving pattern indicated by the signal with the target light receiving pattern to determine the driving amount of the micromirror array. However, in the present embodiment, the target light receiving pattern stored in the mirror driver 24 in advance is different from the first embodiment. In the first embodiment, no matter where the light is reflected on the monitor surface, only the light receiving position on the two-dimensional light receiving sensor 35 is changed, and the amount of light received by the two-dimensional light receiving sensor 35 basically hardly changes. Therefore, the target light receiving pattern of the first embodiment is a pattern on the two-dimensional light receiving sensor 35 in which the light amount at the position corresponding to the target portion is maximized. On the other hand, in the present embodiment, when light reaches the target portion 28a on the monitor surface, most of the light is not reflected, and when light does not reach the target portion 28a, most of the light is reflected. Since the light is guided to the two-dimensional light receiving sensor 35, the target light receiving pattern is a pattern on the two-dimensional light receiving sensor 35 in which the light amount at the position corresponding to the target portion 28a is minimized.
[0041]
As described above, also in the present embodiment, the reflected light from the reflecting material 28 formed on the transparent solid medium 26, which is light that does not enter the output optical fiber 12, is monitored. There is no loss.
[0042]
In the present embodiment, the reflecting material 28 is provided on the optical fiber bundle side surface (light emitting surface) 27a of the transparent solid medium 26. However, the present invention is not limited to this. A reflective material may be provided on the side surface (light incident surface) 27b of the inverse dispersion double spectroscope and the incident end face 13 of the output optical fiber 12, and the light reflected by this reflective material may be monitored.
[0043]
Next, an optical transmission device according to a third embodiment of the present invention will be described with reference to FIG.
[0044]
The optical transmission device of the present embodiment also includes an optical fiber bundle, an inverse dispersion double spectroscope, and an incident light monitoring device 30b, as in the first embodiment.
[0045]
The incident light monitoring device 30b includes a monitor optical system that guides reflected light from the incident end face 13 of the output optical fiber 12 in a specific direction, a two-dimensional light receiving sensor 35 that receives light guided by the monitor optical system, have. The monitor optical system differs from the first embodiment in that the monitor optical system includes a collie-meta optical system 31b. At the focal position of the collimator optical system 31b, the incident end face 13 of the output optical fiber 12, which is a monitor surface, is located. For this reason, the light reflected on the incident end face 13 of the output optical fiber 12 and having passed through the collimator optical system 31b becomes parallel light.
[0046]
In the inverse dispersion double spectroscope of the present embodiment, the irradiation position of the light on the output optical fiber 12 does not basically change at the position of the core end face 14 in the input end face. Changes the irradiation angle. Therefore, when the imaging optical system 31 is used as the monitor optical system as in the first embodiment, the light receiving position of the two-dimensional light receiving sensor 35 can be changed even if the irradiation angle of the light to the output optical fiber 12 changes. Hardly change. Therefore, in the present embodiment, the collimator optical system 31b is adopted as the monitor optical system so that when the irradiation angle of light to the output optical fiber 12 changes, the light receiving position of the two-dimensional light receiving sensor 35 changes. I have.
[0047]
The two-dimensional light receiving sensor 35 outputs a signal corresponding to the position and the amount of light received to the mirror driver 24 as in the first embodiment.
[0048]
In the first and second embodiments described above, the irradiation position of the light on the output optical fiber 12 does not basically change at the position of the core end face 14 in the input end face. Needless to say, when the irradiation angle of light with respect to changes, it is necessary to use a collimator optical system as the monitor optical system.
[0049]
Next, an optical transmission device according to a fourth embodiment of the present invention will be described with reference to FIG.
[0050]
The optical transmission device of the present embodiment also includes an optical fiber bundle, an inverse dispersion double spectroscope, and an incident light monitoring device 30c as in the above embodiments.
[0051]
The incident light monitoring device 30c includes a monitor optical system that guides the reflected light from the incident end face 13 of the output optical fiber 12 in a specific direction, and first and second 2 that receive the light guided by the monitor optical system. Dimensional light receiving sensors 35a and 35b. The monitor optical system includes a beam splitter 32 that separates the reflected light from the incident end face 13 of the output optical fiber 12 in two directions, and an image that guides one of the lights separated by the beam splitter 32 to a first light receiving sensor 35a. An optical system 31 and a collimator optical system 31b that guides the other light separated by the boom splitter 32 to the second light receiving sensor 35b are provided. The incident end face 13 of the output optical fiber 12 which is a monitor surface and the light receiving surface of the first light receiving sensor 35 are arranged at positions optically conjugate to the imaging optical system 31 of the monitor optical system. . Further, the incident end face 13 of the output optical fiber 12, which is a monitor surface, is located at the focal position of the collimator optical system 31b.
[0052]
In the inverse dispersion double spectroscope of this embodiment, both the irradiation position and the irradiation angle of the light to the output optical fiber 12 are changed. Therefore, a change in the light irradiation position is handled by an output from the first light receiving sensor 35a that receives light from the imaging optical system 31, and a change in the light irradiation angle is caused by a collimator. The output from the second light receiving sensor 35b that receives light from the optical system 31b responds.
[0053]
The mirror driver 24 receives the signal from the first light receiving sensor 35a, compares the light receiving pattern indicated by this signal with the target light receiving pattern, obtains the first driving amount of the multi-mirror array, A signal from the two light receiving sensors 35b is also received, and a light receiving pattern indicated by the signal is compared with a target light receiving pattern to obtain a second driving amount of the multi-mirror array. Then, the mirror driver 24 obtains a driving amount obtained by combining the first driving amount and the second driving amount, and drives the multi-mirror array according to the driving amount.
[0054]
In the first and second embodiments described above, when the irradiation position and the irradiation angle of the light on the output optical fiber 12 change, the imaging optical system and the collimator optical system are used as the monitor optical systems. Preferably, it is used. However, when the irradiation angle of light hardly changes and the irradiation position largely changes, only the image forming optical system may be used as the monitor optical system, similarly to the first embodiment, or conversely, the light irradiation position may be changed. Is substantially the same and the irradiation angle changes greatly, the collimator optical system alone may be used as the monitor optical system as in the second embodiment.
[0055]
In the above embodiments, the two-dimensional light receiving sensor is adopted as the light receiving sensor. However, the case where the light incident position on the incident end face changes only in the one-dimensional direction in a plane parallel to the incident end face. Alternatively, when the incident angle of light with respect to the incident end face changes only in a plane including a one-dimensional direction in a plane parallel to the incident end face, the one-dimensional light receiving sensor is used to input the light in the one-dimensional direction. The position or the angle of incidence of light in a plane spreading in the one-dimensional direction may be detected.
[0056]
Further, in the above description, an inverse dispersion double spectrometer has been described as an example of an apparatus having a beam steering function, but the present invention is not limited to this, and the light irradiation position and / or irradiation angle on the optical fiber is not limited thereto. Any device can be used as long as it changes.
[0057]
【The invention's effect】
According to the present invention, in order to monitor the state of incidence of light on an optical fiber, reflected light from the incident end face of the fiber, which is light that does not enter the optical fiber, or reflected light from a reflective material formed on a transparent solid medium. Since the monitoring is performed, the incident position and the incident angle can be easily detected with a simple configuration.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram illustrating a configuration of an incident light monitoring device according to a first embodiment of the present invention.
FIG. 2 is an explanatory diagram illustrating a configuration of an optical transmission device according to the first embodiment of the present invention.
FIG. 3 is a side view of an incident light monitoring device according to a second embodiment of the present invention.
FIG. 4 is an explanatory diagram showing a configuration of an incident light monitoring device according to a second embodiment of the present invention.
FIG. 5 is an explanatory diagram illustrating a configuration of an incident light monitoring device according to a third embodiment of the present invention.
FIG. 6 is an explanatory diagram showing a configuration of an incident light monitoring device according to a fourth embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Optical fiber bundle 11 ... Input optical fiber 12 ... Output optical fiber 13 ... Incident end face 20 ... Inverse dispersion double spectroscope 21 ... Diffraction grating 22 ... MEMS 23 ... Micromirror array 24 ... Mirror driver 30, 30a, 30b , 30c ... incident light monitoring device 31, 31a ... imaging optical system 31b ... collimeter optical system 35, 35a, 35b ... two-dimensional light receiving sensor

Claims (10)

Of the light reaching the incident end face of the optical fiber, receiving light reflected by the incident end face (hereinafter, referred to as a monitor face), and detecting an incident angle and / or an incident position of the light with respect to the incident end face;
An incident light monitoring device, characterized in that: Of the light directed to the incident end face to be incident on the incident end face of the optical fiber through the transparent solid medium, of the transparent solid medium disposed in contact with the incident end face or disposed through the medium Receiving light reflected by any one of a light incident surface and a light exit surface (hereinafter, referred to as a monitor surface), and detecting an incident angle and / or an incident angle of the light with respect to the incident end surface;
An incident light monitoring device, characterized in that: The incident light monitoring device according to any one of claims 1 and 2,
An incident position of light in at least a one-dimensional direction in a plane parallel to the incident end face, and / or an incident angle of light in a plane spreading in at least the one-dimensional direction and perpendicular to the incident end face; To detect the
An incident light monitoring device, characterized in that: The incident light monitoring device according to any one of claims 1 to 3,
The monitor surface has a reflective film,
In the reflection film, a light guide hole for guiding light to a portion of the incident end face of the optical fiber where light is to be incident is formed,
An incident light monitoring device, characterized in that: The incident light monitoring device according to any one of claims 1 to 4,
A monitor optical system that guides reflected light from the monitor surface in a predetermined direction, and a light receiving unit that receives light guided by the monitor optical system,
The monitor optical system is an imaging optical system, and the monitor surface and the light receiving surface of the light receiving unit are arranged at optically conjugate positions.
An incident light monitoring device, characterized in that: The incident light monitoring device according to any one of claims 1 to 4,
A monitor optical system that guides reflected light from the monitor surface in a predetermined direction, and a light receiving unit that receives light guided by the monitor optical system,
The monitor optical system is a collimating optical system, and the collimating optical system is disposed such that its focal position is on the monitor surface.
An incident light monitoring device, characterized in that: The incident light monitoring device according to any one of claims 1 to 4,
A monitor optical system that guides reflected light from the monitor surface in a predetermined direction, and a light receiving unit that receives light guided by the monitor optical system,
The monitor optical system includes an optical path splitting unit that splits an optical path of light reflected from the monitor surface, an imaging optical system that is disposed in one of the optical paths split by the optical path splitting unit, and an optical path splitting unit. A collimate optical system arranged on the other of the divided optical paths,
The light receiving unit has a first light receiving unit that receives light that has passed through the imaging optical system, and a second light receiving unit that receives light that has passed through the collimate optical system,
The imaging optical system is arranged such that the monitor surface and the light receiving surface of the first light receiving unit are conjugate positions,
The collimating optical system is disposed such that its focal position is on the monitor surface.
An incident light monitoring device, characterized in that: An incident monitor device according to any one of claims 1 to 7,
The optical fiber;
A beam steering mechanism that adjusts the position and / or angle of incidence of the incident light with respect to the optical fiber,
The beam steering mechanism adjusts an incident position and / or an incident angle of the light on the optical fiber according to an incident angle and / or an incident angle of the light on the optical fiber detected by the incident light monitoring device.
An optical transmission device, comprising: In a control method of a beam steering mechanism for adjusting an incident position and / or an incident angle of light incident on an optical fiber,
Of the light directed to the optical fiber, an incident end face of the optical fiber, a light incident face of a transparent solid medium disposed in contact with the incident end face or disposed via a medium, and the transparent solid medium Receiving the light reflected on any one of the light exit surfaces,
Adjusting the beam steering mechanism based on the light reception information obtained as a result of the light reception,
A method for controlling a beam steering mechanism. In a control method of a beam steering mechanism for adjusting an incident position and / or an incident angle of light incident on an optical fiber,
At least one of an incident end face of the optical fiber, a light incident face of the transparent solid medium disposed in contact with the incident end face or disposed through the medium, and a light emitting face of the transparent solid medium. While applying a reflection film in advance, a light guide hole for guiding light is formed in advance in a portion of the reflection film where light is to be incident,
Of the light directed to the optical fiber, receiving light reflected from the reflective film,
Adjusting the beam steering mechanism based on the light reception information obtained as a result of the light reception,
A method for controlling a beam steering mechanism.

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