KR100685498B1 - Alignment method of the optical transmitter and receiver in the optical wireless communication system - Google Patents

Abstract

The present invention relates to a device for enabling the transmitter to directly check the position of the receiving end of the laser light, and a transmitting and receiving end alignment method and aligner using the same.

The light detecting apparatus of the present invention is formed on a substrate, a plurality of photodetectors that can receive and detect light from the free space outside the substrate, formed on the substrate, the intensity of the light detected by the plurality of photodetectors It includes a plurality of light emitting diodes that can receive and visually display a signal indicating a. In addition, various alignment methods using the alignment device with the above devices and a removable motor are provided.

Description

Alignment method of the optical transmitter and receiver in the optical wireless communication system

The present invention relates to an apparatus and method for aligning a transmitting and receiving end in a wireless optical communication system, and more particularly, to a device for enabling a transmitter to directly check the position of a receiving end of a laser light, and a transmitting and receiving end alignment method and aligner using the same.

In order to construct a wireless optical communication network, it is essential to install a transmitter and a receiver to align the transmitter and the receiver so that the laser light from the transmitter can be accurately received by the receiver. Conventionally used alignment method in a wireless optical communication system generally goes through the following process.

A) Temporarily install the equipment to face each other using a telescope or sight.

B) Check the position of the laser light at the receiver using the IR viewer at the receiver.

C) Move the transmitter using the fine adjustment screw or motor until the laser beam of the transmitter is found at the receiver.

D) When the receiving end finds the light of the transmitting end, it indicates the position through the radio to the transmitting end.

E) move the laser light toward the light-receiving part of the receiver according to the instruction of the receiver.

E) If the center of laser light coincides with the receiver of receiver, fix transmitter and receiver.

In this conventional method, the wavelength of a light source generally used is an infrared band, and in this case, an infrared viewer can be used to observe the opposite light.

However, when an infrared viewer is used for a long time, the eyes become tired and the viewing area is limited to the moving distance of the eyes, which makes it difficult to observe a large area.

In addition, since it is impossible to align itself at the transmitting end without an instruction through the radio at the receiving end, the alignment speed becomes slow, and it is difficult to accurately match the center of the laser light to the light receiving part of the receiving end.

In addition, in the conventional alignment method, the alignment device is equipped with a driver such as a fine adjustment screw or a motor. In the case of a fine adjustment screw, the precision of the screw line must be very high, which makes the manufacturing process difficult and the manufacturing cost is high. A motor having a fine rotation angle and sufficient torque has a price that is tens of times the manufacturing cost of the aligner except the motor, and its volume and weight are difficult to make the aligner compact and lightweight.

As described above, the conventional alignment method takes a long time to align the transceiver, and it is difficult to accurately align the center of the laser light to the receiver of the receiver. In addition, there is a problem in that the volume and weight of the aligner provided to the user by the motor or the fine adjustment screw for driving the transmitting and receiving end is increased, the price increases.

SUMMARY OF THE INVENTION An object of the present invention is to provide an apparatus and a method for quickly and easily aligning a transmitter and a receiver in a wireless optical communication system.

Another object of the present invention is to reduce the size and weight of the aligner used for aligning a transmitter and a receiver in a wireless optical communication system and to reduce manufacturing costs.

In order to achieve the above object, the present invention provides a laser light detection device and a light intensity display device used for the alignment, and provides a method of aligning the transceiver using a manual, automatic and hybrid method using the same. In addition, the actuator is detachably formed to provide a aligner which is small, light and low in manufacturing cost.

That is, the light detecting apparatus according to the present invention includes a plurality of photodiodes formed on a substrate and a substrate and capable of detecting and detecting light from a free space outside the substrate. And a plurality of light-emitting diodes (LEDs) capable of receiving and visually displaying a signal indicative of the intensity of the light detected by the.

Here, each light emitting diode may be connected to each photodetector, and a transimpedance amplifier and / or a predetermined predetermined frequency in which the light detecting device converts a current signal from the photodetector into a voltage signal. Further comprising a plurality of demodulation circuitry for converting only the signal of to a direct current signal, an amplifier and / or a demodulation circuit may be connected between the photodetector and the light emitting diode. The amplifier circuit and / or demodulation circuit is preferably formed on the opposite side of the surface on which the photodetector and the light emitting diode are formed.

Each photodetector is paired with a respective light emitting diode, and each pair of photodetectors and light emitting diodes are preferably arranged in a lattice form on the substrate.

On the other hand, the light intensity display device according to the present invention includes a receiving terminal for receiving an electrical signal from the outside, and a plurality of light emitting diodes for displaying the intensity of the signal received through the receiving terminal, The light emitting diode of is formed to change the number of light emitting diodes according to the intensity of the signal received through the receiving terminal, the receiving terminal is connected to the power monitoring terminal of the optical receiver used in the wireless optical communication system And it can receive the light intensity signal from the optical receiver.

Here, the plurality of light emitting diodes are arranged in a line, and are mounted in a case for darkening the area around the plurality of light emitting diodes compared with the outside of the light intensity display device, and each of the plurality of light emitting diodes can display at least two different colors. It is preferred to include at least two light emitting diodes.

A method of aligning a transmitter and a receiver in a wireless optical communication system according to the present invention includes a substrate and a plurality of photodetectors formed on the substrate and capable of detecting light by detecting light from free space outside the substrate. A plurality of first light emitting diodes by using a light detection device that includes a plurality of first light emitting diodes that can receive and visually display a signal indicating the intensity of light detected by the plurality of photodetectors. A first step of detecting the position where the laser light from the transmitting end reaches the receiving end from the brightness distribution, and roughly matching the position with the light receiving part of the receiving end, connected to the light intensity detecting terminal of the receiving end to receive an electrical signal from the light intensity detecting terminal Receiving terminal for receiving the input, the strength of the signal received through the receiving terminal And a plurality of second light emitting diodes capable of displaying, wherein the plurality of second light emitting diodes are formed such that the number of second light emitting diodes that are emitted depends on the intensity of a signal received through the receiving terminal. And a second step of detecting a center position of the laser light emitted from the transmitting end from the number of the second light emitting diodes emitted by using the display device, and matching the center position with the light receiving portion of the receiving end.

In the first step, the position of the photodetector corresponding to the brightest first light emitting diode among the plurality of first light emitting diodes is detected as the position where the laser light from the transmitting end reaches the receiving end, and in the second step, The position of the laser light when the largest number of the plurality of second light emitting diodes is emitted can be detected as the center position.

Another alignment method according to the present invention is a method of aligning a transmitter and a receiver in a wireless optical communication system using a computer capable of receiving and processing a signal indicating the intensity of light received by the receiver, and scanning laser light from the transmitter. A first step of specifying a range, interval, and speed, a second step of transmitting a signal indicative of the intensity of light received by the receiver from the receiver to the computer upon initiating scanning at the specified scanning range, interval, and speed, A third step of determining whether or not the laser light from the transmitter is received by the receiver; and storing the received signal value and the corresponding scan position when it is determined that the laser light is received by the receiver in the third step. A fourth step of determining whether reception of the laser light is stopped; If it is determined in step 5 that the reception of the laser light is stopped, the received signal has the largest value between the sixth step of stopping scanning and the scanning position stored in the fourth step and the scanning stop position of the sixth step. And a seventh step of determining the indicated position, and an eighth step of moving the transmitter to the position at which the received signal exhibits the largest value.

Here, after the sixth step, determining whether or not the position indicating the highest value of the received signal is located at the corner of the scanning range, and the position indicating the highest value of the received signal is If it is determined that it is located at the corner of the scanning range, reassigning the scanning range to an adjacent portion of the corner of the scanning range including the position where the received signal indicates the largest value and repeating the second to eighth steps. It may further comprise a step.

In the third step, when the signal representing the intensity of light received by the receiver exceeds a predetermined value, it is determined that the laser light from the transmitter is received by the receiver. When the signal representing the intensity of the received light becomes less than or equal to a predetermined value, it may be determined that reception of the laser light is stopped.

Yet another alignment method according to the present invention includes a substrate, a plurality of photodetectors formed on the substrate and capable of detecting and detecting light from a free space outside the substrate, and a plurality of photodetectors formed on the substrate. A laser emitted from a transmitter from a brightness distribution of the plurality of first light emitting diodes by using a light detection device including a plurality of first light emitting diodes capable of receiving and visually displaying a signal indicative of the light intensity detected by the Detecting a position where light reaches the receiver, roughly matching the position with the light receiving portion of the receiver, and determining a predetermined range from the brightness distribution of the first light emitting diodes, the predetermined range determined in the first step The reception is performed by setting the scan range and starting the scan at a predetermined predetermined scan interval and speed. A second step of transmitting a signal indicating the intensity of light received at the stage to the computer; a third step of determining whether the laser light from the transmitting end is received at the receiving end; and in the third step, the laser light is If it is determined that the reception is received by the receiving end of the fourth step of storing the scanning position, the fifth step of determining whether the reception of the laser light is stopped, the fifth step is determined that the reception of the laser light is stopped A sixth step of stopping scanning; a seventh step of determining a position between the scanning position stored in the fourth step and the scanning stop position of the sixth step indicating the largest value; And an eighth step of moving the transmitter to the position representing the largest value.

On the other hand, the transceiver aligning device according to the present invention includes a transceiver moving means arranged to change or fix the position of the transceiver holder and the transceiver holder in a predetermined direction, the transceiver moving means is an external driver and And a fixing means for fixing the position of the transceiver holder which can be connected, and the position of the transceiver holder can be changed in the predetermined direction using the driver while being connected to an external driver using the connection portion. It is formed so as to fix the position of the transceiver holder using the fixing means.

Here, the transceiver movement means may be two or more, and the predetermined direction may be up and down or left and right.

1A is a view showing the overall structure of an infrared detection plate according to an embodiment of the present invention.

FIG. 1B is an enlarged view of portion A of FIG. 1A.

1C is a block diagram showing the configuration of a circuit formed on an infrared detection plate according to an embodiment of the present invention.

2 is a view showing the structure of the LED indicator according to an embodiment of the present invention.

3 is a flowchart of a manual alignment method according to an embodiment of the present invention.

4 is a flowchart of a method of automatic alignment according to an embodiment of the present invention.

5 is a conceptual diagram illustrating a sorter scanning method used in an embodiment of the present invention.

6 is a flowchart of a hybrid alignment method according to an embodiment of the present invention.

7 is a view schematically showing the configuration of the actuator removable sorter according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The alignment method of the optical transmitter proposed by the present invention can be broadly divided into a) manual alignment, b) automatic alignment, and c) a mixture of manual and automatic alignment. The greatest feature of these alignment methods is that the alignment is performed while checking the position of the laser light reaching the receiver directly from the transmitter without an instruction from the receiver.

The present invention proposes an infrared detection plate and LED indicator having a photodetector and an LED as a positioning device of the laser light for such alignment.

First, the structure and function of an infrared detection plate are demonstrated. The structure of the infrared detection plate according to the present invention is shown in FIGS. 1A-1C. FIG. 1A shows the overall structure of the infrared detection plate, FIG. 1B is an enlarged view of the region A of FIG. 1A, and FIG. 1C is a block diagram showing the configuration of a circuit formed on the infrared detection plate.

As shown in Figure 1a, the infrared detection plate 100 of the present invention is a portion of the main body 110 consisting of a plate of a certain size and the infrared detection plate 100 can be lifted by hand so that the main body 110 toward the transmitting end. The handle 120 is formed in a portion, and the main body 110 is attached to the photodetector 112 and the light emitting diode 114 in the infrared region in the form of a grid at a predetermined interval.

Here, the photodetector is formed of silicon (Si), germanium (Ge), or InGaAs depending on the wavelength, and the diameter of the effective detection region (Fig. 1B; 113) is preferably large. The effective detection area 113 of the photodetector is usually narrower than the entire area 112 of the photodetector. On the other hand, the light emitting diode 114 is a device having a characteristic that the intensity of the light emitted is increased as the magnitude of the applied voltage increases.

A circuit for connecting the two elements 112 and 114 with the amplifier 116 and the demodulation circuit 118 at the center of each photodetector 112 and the light emitting diode 114 at the back of the infrared detection plate 100. Is formed. That is, the configuration of the circuit is, as shown in Figure 1c, the photodetector 112 is connected to the input side of the amplifier 116, the output side of the amplifier 116 is connected to the input side of the demodulation circuit 118, the demodulation circuit The output side of 118 is configured to be connected to the light emitting diode 114.

The basic principle of the infrared detection plate 100 according to the embodiment of the present invention indicates the intensity of the light detected by the photodetector 112 through the light emitting diode 114 to receive the arrival position of the laser light emitted from the transmitting end. It is to be able to grasp directly from the transmitting end spaced apart from the receiving end as well.

However, since sunlight generally includes infrared rays, the light emitting diode of the infrared detection plate is turned on even when the detection rate of the photodetector is high even when the infrared laser light does not enter the infrared detection plate from the transmitter by strong direct sunlight. Can be. Therefore, in the present invention, it is possible to distinguish the infrared light from the sunlight and the transmitter light from the transmitter by using a demodulation circuit.

The infrared detection plate proposed in the present invention detects a signal through the following process.

First, the transmitter modulates the intensity of the infrared laser light at a constant frequency. The light modulated by the transmitter is then detected by the photodetector 112 of the infrared detection plate and converted into an alternating current electrical signal, which is detected as a direct current signal through the demodulation circuit 118. The demodulation circuit 118 has a function of converting only a signal of a desired frequency into a DC signal and removing the rest. Therefore, only the infrared signal of the transmitter is detected and the light emitting diode 114 is turned on by switching only the signal corresponding to the modulation frequency of the transmitter among the signals input to the demodulation circuit 118 and removing the rest. The amplifier 116 converts the current signal from the photodetector into a voltage signal.

As such, since the brightness of the light emitting diode 114 is changed according to the intensity of the laser light received in the effective detection region 113 of each photodetector 112 mounted in the grid in the infrared detection plate 100, The intensity, range, and shape of the laser light can be determined by observing the brightness distribution of the light emitting diodes 114 in the detection plate 100.

As a result, the infrared detection plate proposed by the present invention has an advantage that the position of the laser light can be detected more easily and quickly than the infrared viewer, the shape and size of the laser light can be easily detected, and the detection range of the laser light is also wide.

Now, an LED indicator according to an embodiment of the present invention will be described. 2, the structure of the LED indicator 200 according to the embodiment of the present invention is briefly shown. The LED indicator 200 enters the receiver by connecting an LED bar composed of a plurality of LEDs 210 with a power monitoring terminal (not shown) of the receiver through the receiver connector 230. It is a device that can observe the laser light intensity from a remote place.

As shown in FIG. 2, a plurality of light emitting diodes 210 are mounted on the LED indicator 200 in a line to form an LED bar, and the number of light emitting diodes that are emitted depends on the intensity of the applied voltage. Consists of. In addition, the LED bar is mounted inside the case 220 to darken the surroundings so that the LED light can be easily checked even if the outside of the LED bar is bright. As shown in the figure, it is possible to easily distinguish the number of LEDs that are emitted from a distance by changing the color of the LED used in the LED bar for each predetermined area.

According to the present invention, by observing the LED indicator at the receiving end through a telescope or scope, the transmitter can adjust the transmitter and immediately know the intensity of the light entering the receiver, so that the center of the laser light can be exactly matched to the receiver of the receiving end. have.

In general, the infrared detection plate 100 is useful for the approximate positioning of the laser light, and the LED indicator 200 is used to accurately match the laser light to the light receiving portion of the receiving end. In addition, the present invention proposes an alignment method of the following three methods using such equipment.

First, there is a manual alignment method of performing alignment by manually controlling the microadjustment screw or the motor directly, and this method is subjected to the following process, as shown in FIG.

A) Roughly aligns the transmitter and the receiver by using a device capable of confirming the direction of the transmitter, such as a sight scope (S310). This is to prevent the laser light of the transmitter from going too far from the receiver and being unable to be detected through the infrared detection plate.

B) After confirming the position of the laser light using the infrared detection plate (S320), the position and the light receiving unit of the receiver are approximately coincided (S330).

3) Using the LED indicator, the center of the laser light and the light receiving unit of the receiver are exactly matched (S340).

Secondly, there is an automatic alignment method in which a whole process of alignment is performed by a computer using a motor controller and a motor which can be controlled by a computer.

4 is a flowchart illustrating an automatic alignment method according to an embodiment of the present invention.

First, the position of the receiver is widely estimated, and the scanning range and scanning interval and the scanning speed of the horizontal and vertical are designated (S410), and then scanning is started (S420). The scan method uses a raster scan method as shown in FIG. 5.

The electrical signal (RSSI) detected at the light intensity detection terminal of the receiver enters the motor controller or computer of the transmitter via normal shortwave wireless or wired communication.                 

When the laser light of the transmitter enters during scanning (S430), the detected RSSI signal value and its position are stored (S440), and the scanning is further performed to stop scanning in the scanning line where the laser light disappears again (S450) (S460). ).

Next, it is determined whether the maximum value Peak of the detected RSSI signals is greater than the RSSI value RSSI_INI when the laser light does not enter the receiver (S470).

If the peak value is larger than RSSI_INI, the laser light from the transmitter has been received. If not, the laser light from the transmitter has not been received. Therefore, it returns to the beginning and starts scanning again in another scanning range.

In operation S480, it is determined whether the peak value PeakXY detected with the maximum value is an edge of the scanning area. If PeakXY is located at the edge of the scan area, a larger RSSI value can be detected outside the scan area, and the scan returns to the beginning and starts scanning in another range.

If PeakXY is not located at the edge of the scanning area but within the scanning area, it means that the receiving point of the laser light is located in the scanning area, and thus alignment is completed by moving the transmitter to the PeakXY position using a motor (S490).

If the laser light of the transmitter is not detected at the receiver within the specified scanning range, it is determined with the same scanning area, spacing, and speed in the adjacent part of the designated scanning range (for example, immediately below the designated scanning range) as prescribed. Scanning may be started, and if the strongest portion of the RSSI is located at the edge of the scan area, scan of the area abutting the edge is performed.                 

Third, there is a hybrid sorting method which improves the sorting speed rather than using only one method by properly mixing the manual sorting and the automatic sorting described above. The method is briefly described as follows.

First, for rough alignment, steps S610 to S630 corresponding to steps S310 to S330 in the manual alignment method are performed to substantially match the position of the laser light identified using the infrared detection plate to the light receiving unit of the receiver.

Next, by performing the automatic alignment in the method as described above with reference to the range near the approximately matched point to exactly match the center of the laser light and the light receiving portion of the receiving end (S640). In this case, since the scanning area for automatic alignment can be very narrowed, the alignment can be completed in a short time.

Basically, all three sorting methods described above can significantly improve the sorting time, and one of these three methods can be selected as needed. Thirdly, the hybrid alignment method presented is an alignment device, which uses an infrared detection plate, an LED indicator, and a computer according to an embodiment of the present invention, which requires a lot of alignment equipment, which is expensive and cumbersome to move, but has the fastest alignment speed. Conversely, the first manual sorting method and the second automatic sorting method take more time to align than the hybrid sorting method, but only the infrared detection plate and the LED indicator (manual sorting) or the computer (automatic sorting) are needed. The advantage is that the alignment equipment is simplified. Therefore, what is necessary is just to select each of these methods suitably according to a situation.

On the other hand, the present invention proposes a method for manufacturing a low-cost, light weight, miniaturized aligner by detachably configuring the actuator used in the aligner. Fig. 7 schematically shows an example of a driver removable aligner capable of removing or mounting a driver.

As shown in FIG. 7, the aligner 700 typically has two transceiver holders 711 and 712 paired with each other. The transceiver holder 711 shown on the left side of the drawing can move the transceiver holder left and right. It is fixed to the transceiver left and right rotating plate 730, the horizontal plate 730 for transmitting and receiving the horizontal support for receiving the connecting portion of the transceiver holder 711 and the transceiver left and right rotating plate 730 to move left and right. The vertical direction is fixed by). The horizontal support 720 is fixed to the transceiver shank dong rotating plate 750 which can move the transceiver holder 711 up and down, the transceiver shank dong rotating plate 750 is a horizontal support 720 and the transceiver shank dong rotating plate ( The horizontal direction is fixed by the vertical support 740 that accommodates the connection portion 750 to be movable up and down. The vertical support 740 is fixed to the support plate 701 for supporting the entire structure again. The transceiver holder 712 shown on the right side of the figure is also fixed in a similar manner.

The transceiver plate 750 may be connected to the motor coupler 790 through a protruding portion or fixed to the vertical support 740 by locking screws 760 on both sides. The motor 770 is connected to the opposite side of the portion of the motor coupler 790 that is connected to the rotating plate 750 for the shanghai copper, and the motor 770 is fixed by the motor holder 780.                 

That is, during alignment, the motor coupler 790 and the motor holder 780 are fixed to the transceiver shank dong rotating plate 750 and the vertical support 740, respectively, using the transceiver shank dong rotating plate 750. After moving the transceiver holder 711 up and down to fix the transceiver, and after the alignment is completed, fix the rotating plate 750 for the transceiver shangdong of the aligner using the locking screw 760, and then the motor coupler 790 and the motor holder. Loosen the fixing screw (780) and remove the motor (770). Although the alignment method has been described using an example of moving the transceiver 711 shown in the left side of the drawing as an example, it may be similarly performed in the case of horizontal movement of the transceiver 711 or vertical movement of the other transmitter 712. Is obvious. That is, the motor can be attached or removed in the direction of the arrow shown in the drawings, the two motors on the left side of the figure shows the state removed from the aligner, the two motors on the right side of the figure shows the state attached to the aligner.

If the alignment is misaligned due to external factors or otherwise needs to be realigned as needed, the maintenance personnel can realign the motor by moving the transceiver holder again by removing the motor and loosening the locking screw.

In this way, when the motor and the motor holder are detachably formed, the motor and the motor holder can be repeatedly used for a plurality of aligners, so that the manufacturing cost of the aligner is low, and the aligner is light and small.

The present invention has been described in detail with reference to preferred embodiments, but the scope of the present invention is not limited thereto, and should be interpreted by the following claims. In addition, those skilled in the art will appreciate that various modifications and changes can be made without departing from the spirit of the invention.

As described above, the alignment apparatus and the method of the present invention can be easily and quickly align the transceiver in the wireless optical communication system because it is possible to align the transceiver directly on the transmitter side without directing the radio from the receiver when aligning the transceiver.

In addition, the aligner proposed in the present invention is to remove the driver after the alignment and fixing is completed, it is possible to manufacture a cheaper, smaller, lighter aligner that does not include a driver and a drive controller, the alignment of the aligner later by any factor If this is the case, you can simply rearrange the driver by refitting the driver.

Claims (24)

Board, A plurality of photodetectors formed on the substrate and capable of detecting and detecting light from free space outside the substrate; A plurality of light emitting diodes formed on the substrate, the plurality of light emitting diodes being capable of receiving and displaying a signal indicative of the intensity of light detected by the plurality of photodetectors; Wherein each light emitting diode is connected to the respective photodetector. delete The method of claim 1, And a plurality of amplifier circuits for converting the current signal from each photodetector into a voltage signal. The method of claim 1, It further includes a plurality of demodulation circuit for converting only a signal of a predetermined predetermined frequency into a direct current signal, Wherein each demodulation circuit receives a signal from each of the amplifiers and transfers the converted signal to the respective light emitting diodes. The method according to claim 3 or 4, And the amplifier circuit, or the demodulation circuit, or both the amplifier circuit and the demodulation circuit are formed on a surface opposite to the surface on which the photodetector and the light emitting diode are formed on the substrate. The method of claim 1, The light detector is capable of detecting light in the infrared region. The method of claim 1, The light detecting device is used to align the transmitter and the receiver used in the wireless optical communication system. The method of claim 1, Each of the photodetectors is paired with each of the light emitting diodes. The method of claim 8, And each of the paired photodetectors and light emitting diodes are arranged in a lattice form on the substrate. It includes a receiving terminal for receiving an electrical signal from the outside, and a plurality of light emitting diodes for displaying the strength of the signal received through the receiving terminal, The plurality of light emitting diodes are formed such that the number of light emitting diodes changes according to the intensity of a signal received through the receiving terminal. And the receiving terminal is connected to a power monitoring terminal of an optical receiver used in a wireless optical communication system to receive a light intensity signal from the optical receiver. The method of claim 10, And a plurality of light emitting diodes arranged in a line. The method of claim 10, And the plurality of light emitting diodes are mounted in a case for darkening the periphery of the plurality of light emitting diodes compared to the outside of the light intensity display device. The method of claim 10, And the plurality of light emitting diodes each include at least two light emitting diodes capable of displaying at least two different colors. A method for aligning a transmitting end and a receiving end in a wireless optical communication system, A plurality of photodetectors formed on the substrate and capable of detecting and receiving light from free space outside the substrate; a signal formed on the substrate and representing the intensity of light detected by the plurality of photodetectors By using a light detection device including a plurality of first light emitting diode that can receive and visually display the detection, the position where the laser light from the transmitting end reaches the receiving end from the brightness distribution of the plurality of first light emitting diodes A first step of roughly matching the position with the light receiving portion of the receiving end, And a plurality of second light emitting diodes connected to a light intensity detecting terminal of a receiving end to receive an electrical signal from the light intensity detecting terminal, and a plurality of second light emitting diodes to display the intensity of the signal received through the receiving terminal. The plurality of second light emitting diodes may be formed from the number of the second diodes that emit light using an optical intensity display device configured to change the number of the second light emitting diodes according to the intensity of the signal received through the receiving terminal. And a second step of detecting a center position of the laser light emitted from the transmitting end and matching the center position with the light receiving portion of the receiving end. The method of claim 14, In the first step, And a position of the photodetector corresponding to the brightest first light emitting diode among the plurality of first light emitting diodes as a position where the laser light from the transmitting end reaches the receiving end. The method of claim 14, In the second step, And a position of the laser light when the largest number of the plurality of second light emitting diodes emits light as the center position. A method of aligning a transmitter and a receiver in a wireless optical communication system using a computer capable of receiving and processing a signal indicating the intensity of light received by the receiver, A first step of specifying the scanning range, spacing and speed of the laser light from the transmitter, A second step of transmitting a signal from the receiver to the computer indicative of the intensity of light received at the receiver upon initiating a scan at the specified scan range, interval and speed, Determining whether the laser light from the transmitter is received by the receiver; A fourth step of storing a received signal value and a corresponding scan position when it is determined that the laser light is received by the receiver in the third step, A fifth step of determining whether reception of the laser light is stopped, A sixth step of stopping scanning when it is determined in the fifth step that reception of the laser light is stopped; A seventh step of determining a position at which the received signal exhibits the largest value between the scan position stored in the fourth step and the scan stop position of the sixth step, And an eighth step of moving the transmitter to a position where the received signal exhibits the largest value. The method of claim 17, After the seventh step, Determining whether or not the position at which the received signal represents the largest value is located at an edge of the scanning range, If it is determined that the position at which the received signal has the largest value is located at the corner of the scanning range, the scanning range is moved to an adjacent portion of the corner of the scan range including the position at which the received signal has the largest value. And respecifying and repeating the second to eighth steps. The method of claim 17, In the third step, And determining that the laser light from the transmitter is received by the receiver when the signal representing the intensity of light received by the receiver exceeds a predetermined value. The method of claim 17, In the fifth step, And determining that the reception of the laser light is stopped when the signal representing the intensity of light received by the receiver becomes less than or equal to a predetermined value. A method for aligning a transmitting end and a receiving end in a wireless optical communication system, A plurality of photodetectors formed on the substrate and capable of detecting and receiving light from free space outside the substrate; a signal formed on the substrate and representing the intensity of light detected by the plurality of photodetectors By using a light detection device including a plurality of first light emitting diodes that can be received and visually displayed, by detecting the position where the laser light from the transmitting end reaches the receiving end from the brightness distribution of the plurality of first light emitting diodes A first step of roughly matching the position with the light receiving portion of the receiving end and determining a predetermined range including the position; A second step in which a signal indicating the intensity of light received at the receiving end is transmitted to a computer as scanning is performed at a predetermined range determined in the first step as a scanning range and at a predetermined predetermined scanning interval and speed; A third step of determining whether laser light from the transmitting end is received at the receiving end, A fourth step of storing a received signal value and a corresponding scan position when it is determined that the laser light is received by the receiver in the third step, A fifth step of determining whether reception of the laser light is stopped, A sixth step of stopping scanning when it is determined in the fifth step that reception of the laser light is stopped; A seventh step of determining a position at which the received signal exhibits the largest value between the scan position stored in the fourth step and the scan stop position of the sixth step, And an eighth step of moving the transmitter to a position at which the received signal represents a long maximum value. delete delete delete

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