KR20110122373A - Fso transceiver for dual communication using single optical system and communication module for fso transmitting and receiving - Google Patents

Abstract

PURPOSE: An FSO(Free Space Optics) transmitting/receiving apparatus and communication module for the same are provided to implement wireless transmission/reception through one optical system by including a transmitting/receiving diode. CONSTITUTION: A transmitting diode(210) outputs a transmitting signal through transmitting light. The transmitting diode irradiates transmitting light through an optical system and transmits receiving light through the optical system. A receiving diode(220) converts the receiving signal into an electrical signal. The transmitting/receiving diode is located on an optical path of one optical system lens(230). The transmitting/receiving diode is located within the circumference of the receiving light. The transmitting diode is located on the optical axis of the receiving light.

Description

FSO transceiver for dual communication using single optical system and Communication module for FSO transmitting and receiving}

The present invention relates to a dual communication FSO transmission and reception apparatus using a single optical system and a communication module for FSO transmission and reception, by having a diode for transmission and a diode for reception in one module to perform wireless transmission and reception using one optical system. have.

Free Space Optics (FSO) technology is a technology that transmits various information such as voice, video, data to the laser and transmits it to the air. Thus, when using FSO technology, gigabit-class high-speed data transmission is possible without installing a fiber optic cable or obtaining a radio frequency license between a service provider and a subscriber.

In a conventional dual communication FSO system capable of transmitting and receiving, each transceiver has a transmission optical lens and a receiving optical lens for dual communication. That is, one transceiver capable of transmitting and receiving includes two or more optical lenses for dual communication.

1 is a diagram illustrating an example of a conventional transceiver. Referring to FIG. 1, the transceiver 200 includes two transmitting lenses 210 and 120 and one receiving lens 230. Therefore, in the conventional FSO system, as the transceiver uses the transmission optical system and the reception optical system, it is difficult to reduce the cost and size of the transceiver.

Accordingly, an object of the present invention for solving the above problems is to provide a dual communication FSO transceiver and communication module for FSO transmission and reception using a single optical system that can provide a low cost and miniaturization of the product by minimizing the number of optical systems will be.

 A dual communication FSO transmission / reception apparatus using a single optical system according to an embodiment of the present invention includes a single optical lens, a transmission diode for outputting a transmission signal to the transmission light, and a transmission light carrying the transmission signal. And a transmitting / receiving unit which emits to the outside through the optical system and receives the received light carrying the receiving signal from the outside through the optical system, and a receiving diode converting the receiving signal among the received receiving light into an electrical signal, The transmitting diode and the receiving diode are located on an optical path of the single optical lens, and the transmitting diode and the receiving diode are located within the circumference of the receiving light, wherein the transmitting diode is an optical axis of the receiving light. The receiving diode may be positioned to deviate from the optical axis of the received light.

The receiving diode may be positioned on the same surface as the transmitting diode and may be positioned on an optical path of the received light.

The transmitting diode and the receiving diode may use different light wavelengths so as not to interfere with each other.

The wavelength used in the transmitting diode has a peak range response characteristic among the wavelength characteristics of the receiving diode, and the wavelength used in the receiving diode has a narrow band peak response characteristic. Have

The wavelength of the transmitting diode is the same as the wavelength of the receiving diode of the external transmitting and receiving device located in the outside, the wavelength of the receiving diode is the same as the wavelength of the transmitting diode of the external transmitting and receiving device.

The transmitting diode and the receiving diode are provided in one module.

On the other hand, the module for dual communication according to an embodiment of the present invention, a single optical lens, a transmission diode for outputting a signal for transmission to the single optical lens to the transmission light, and received through the single optical lens Receiving diode for converting a receiving signal of the received light into an electrical signal, wherein the transmitting diode and the receiving diode is located on the optical path of the single optical lens, the transmitting diode and the receiving diode Located in the circumference of the receiving light, the transmitting diode may be located on the optical axis of the receiving light, the receiving diode may be located to deviate from the optical axis of the receiving light.

According to an embodiment of the present invention, in the dual communication FSO system capable of transmitting and receiving, a transmitting diode and a receiving diode may be provided in one module. As a result, the FSO transmission / reception apparatus according to an embodiment of the present invention can perform wireless transmission / reception using one optical system, and as a result, the FSO transmission / reception apparatus can be reduced in cost and size.

1 is a diagram illustrating an example of a conventional transceiver.
2 and 3 are diagrams for explaining a module for FSO transmission and reception according to an embodiment of the present invention.
4 is a view for explaining an example provided with a module for FSO transmission and reception according to an embodiment of the present invention.
5 is a view for explaining a method for minimizing the effect of reflection interference in the FSO module according to an embodiment of the present invention.
6 is a view for explaining an example of the peak range response characteristics of the receiving diode.
7 is a view for explaining an example of the narrow-band peak response characteristics of the receiving diode.
8 illustrates an FSO transmission / reception system for dual communication according to an embodiment of the present invention.
FIG. 9 is a diagram for describing an example of wavelengths employed in the first and second transmitting diodes and the first and second receiving diodes of FIG. 8.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In describing the present invention, when it is determined that detailed descriptions of related known functions or configurations may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. Terminology used herein is a term used to properly express a preferred embodiment of the present invention, which may vary according to a user, an operator's intention, or a custom in the field to which the present invention belongs. Therefore, the definitions of the terms should be made based on the contents throughout the specification.

2 and 3 are diagrams for explaining a module for FSO transmission and reception according to an embodiment of the present invention. Referring to FIG. 2, the module 200 includes a transmitting diode 210 and a receiving diode 220. Include. The transmitting diode 210 and the receiving diode 220 are positioned on the optical path of the single optical lens 230. Also, the transmitting diode 210 and the receiving diode 220 are located in the circumference of the receiving light, the transmitting diode 210 is located at the optical axis of the receiving light, and the receiving diode 220 is located at the optical axis of the receiving light. Position it away. Alternatively, the transmitting diode 210 may be provided to be positioned at the center of the optical axis of the received light. In addition, the transmitting diode 210 and the receiving diode 220 are provided on the same surface, the receiving diode 220 is located in the optical path of the received light.

As a result, the reception diode 220 is provided at a position at which the reception light is incident within a focal length range of the optical lens. The optical axis of the reception light in which the transmitting diode 210 is located may be the optical axis of the optical path to which the reception light is incident.

Referring to FIG. 3, the receiving diode 220 is provided at a position deviated from the optical axis, and is provided at a position as close as possible to the focal length of the single optical lens 230 so as to receive all incident light. Even if the receiving diode 220 is provided so as to deviate from the optical axis, the reason for receiving the received light is that the light basically has characteristics of wave and particle.

Therefore, the role of the receiving diode 220 in the FSO system is to receive the particles of light and convert them into electrical signals. Even if the receiving diode 220 is provided at a position off the optical axis, the receiving diode 220 is provided on the optical path. can do. This is because the reception diode 220 receives light in proportion to the area of the photo sensor in the reception diode 220.

4 is a view for explaining an example in which a module is provided in the FSO transceiver according to an embodiment of the present invention.

Referring to FIG. 4, a lens cap 240 is provided outside the optical lens 230 to fix the optical lens 230 and to protect the optical lens 230 from an external physical shock. The housing 250 is provided outside the module 200 to protect the module 200 from external physical shocks. The housing 250 may be formed by aluminum alloy for diecastings that use high pressure injection / casting of molten metal using a metal mold among aluminum alloy castings. The lens cap 240 and the housing 250 may be lens barrels.

The housing 260 protects the space where the focus of the optical lens 230 is formed and may be made of a precision press sheet metal mold. The housing 260 includes two or more screw holes 261 and 162 for fixing the module 200 to the FSO transceiver, and two or more screw holes for connecting and fixing the housing 250 and the housing 260 to each other. 263 and 164 are formed.

5 is a view for explaining a method for minimizing the effect of reflection interference in the FSO module according to an embodiment of the present invention.

When the transmitting diode 210 and the receiving diode 220 are provided in one module 200, the transmitting diode 210 and the receiving diode 220 have the same optical wavelength (for example, a laser wavelength). When using, as shown in FIG. 5, the transmitting diode 210 and the receiving diode 220 are subjected to mutual interference by light reflection inside the optical system. As a result, noise is generated in the transmission signal or the reception signal. In order to prevent such interference, the transmitting diode 210 and the receiving diode 220 use different light wavelengths.

For example, the wavelength used in the transmitting diode 210 may be a wavelength having a peak range response characteristic among the wavelength characteristics of the receiving diode 220 as shown in FIG. 6. . Peak range response is a characteristic that shows high sensitivity only at a specific wavelength.

In addition, the wavelength used in the reception diode 220 may be a wavelength having a narrow band peak response as shown in FIG. 7. This is because the receiving diode 220 does not react to light having a wavelength outside the narrow band range. The narrow band peak response characteristic is a characteristic in which the photodiode does not react to light having a wavelength outside the narrow band range.

6 is a diagram illustrating an example of a peak range response characteristic of a receiving diode, and FIG. 7 is a diagram illustrating an example of a narrow band peak response characteristic of a receiving diode.

6 and 7, Responsivity represents a ratio of an output signal to a magnitude of an input signal incident on a detector that detects a magnitude of a wavelength. If the output signal is current, A / W is used. Referring to FIG. 6, the receiving diode 220 has a peak characteristic at 850 nm, and referring to FIG. 7, the receiving diode 220 has a narrow band peak response characteristic at 1220 nm. Accordingly, the transmitting diode 210 may be designed to use an optical wavelength of 850 nm, and the receiving diode 220 may be designed to use an optical wavelength of 1220 nm.

In addition, the wavelength of the transmitting diode 210 is the same as the wavelength of the receiving diode of an external transceiver (not shown) located outside, the wavelength of the receiving diode 220 is the wavelength of the transmitting diode of the external transceiver. Is the same as

8 illustrates an FSO transmission / reception system for dual communication according to an embodiment of the present invention.

The FSO transmission / reception system is a communication system for transmitting a signal wirelessly. The FSO transmission / reception system modulates all kinds of data signals input to a transmitting end (for example, a first FSO transmission / reception apparatus), and loads the modulated signal on light to provide an optical system. Through Free Space Optics. The emitted light is converged through the optical system at the receiving end (eg, the second FSO transceiver), and is converted into an electrical signal and then demodulated. Therefore, the original data signal input at the transmitting end is recovered at the receiving end.

The FSO transmission / reception system for dual communication is a communication system in which each device 800 and 900 transmits and receives light using one optical system. Referring to FIG. 8, the FSO transceiving system for dual communication includes a first FSO transceiving apparatus 800 and a second FSO transceiving apparatus 900. Both the first FSO transceiver 800 and the second FSO transceiver 900 may operate in a transmission mode for transmitting light or a reception mode for receiving light.

Hereinafter, a case in which the first FSO transceiver 800 operates in the transmission mode and the second FSO transceiver 900 operates in the reception mode will be described first.

The first FSO transceiver 800 modulates all types of input data signals, and loads the modulated signals onto light and emits them onto the FSO through an optical system. To this end, the first FSO transceiver 800 includes a first circuit unit 810, a first module 820, and a first transmitter / receiver 830.

The first circuit unit 810 modulates an input data signal (Data Signal Input 1). In the case of the reception mode, the first circuit unit 810 may demodulate the received signal.

The first module 820 is a module including a first transmitting diode 821 and a first receiving diode 822, and may be located inside or outside an optical path. Since the first module 820 is the module 200 described with reference to FIGS. 2 to 7, a detailed description thereof will be omitted.

The first transmitting diode 821 loads the data signal modulated by the first circuit unit 810 on the transmission light and outputs the optical signal to the optical system. The light may be a laser. The first transmitting diode 821 may be a laser diode.

The first transmitter / receiver 830 includes an optical system having at least one lens 831. The first transmitter / receiver 830 transmits the transmission light output from the first transmitter diode 821 to a receiver, that is, the second FSO transceiver 900 through an optical system.

Meanwhile, the second FSO transceiver 900 operating in the reception mode converges the light emitted from the first FSO transceiver 800 through the optical system, converts the light emitted into the electrical signal, and demodulates the signal. That is, the raw data signal input to the transmitting end is incident to the receiving end and restored to the original data signal. To this end, the second FSO transceiver 900 includes a second transmitter / receiver 910, a second module 920, and a second circuit unit 930.

The second transmitter / receiver 910 includes an optical system having at least one lens 911. The second transmitter / receiver 910 receives the light transmitted from the first FSO transceiver 800 as the received light through the optical system.

The second module 920 is a module including the second receiving diode 921 and the second transmitting diode 922 and may be located inside or outside the optical path. Since the first module 820 is the module 200 described with reference to FIGS. 2 to 7, a detailed description thereof will be omitted.

The second receiving diode 921 converts a reception signal of the received light received through the second transmitter / receiver 910 into an electrical signal. The second receiving diode 921 may be a photodiode.

The second circuit unit 930 demodulates the reception signal converted from the second reception diode 921 into an electrical signal and outputs the same data signal as the data signal (Data Signal Input 1) input to the first FSO transceiver 800. Create

Meanwhile, when the second FSO transceiver 900 operates in the transmission mode, the second circuit unit 930 modulates a data signal (Data Signal Input 2) to be transmitted to the first FSO transceiver 800 and then the second module 920. ) Is input to the second transmission diode 922.

The second transmitting diode 922 loads the data signal modulated by the second circuit unit 930 to the transmission light and outputs the optical signal to the optical system. The second transmitting diode 922 may be a laser diode.

The second transmitter / receiver 910 transmits the transmission light emitted from the second transmitter diode 922 to the first FSO transceiver 800 through an optical system.

At this time, the first FSO transceiver 800 operates in a reception mode. The first transmitter / receiver 830 receives the light transmitted from the second FSO transceiver 900 through the optical system.

The first receiving diode 822 of the first module 820 converts the received light, that is, the received light into an electrical signal. The first receiving diode 822 may be a photodiode.

The first circuit unit 810 demodulates the converted electrical signal to generate the same data signal as the data signal (Data Signal Input 2) input to the second FSO transceiver 900.

FIG. 9 is a diagram for describing an example of wavelengths employed in the first and second transmitting diodes and the first and second receiving diodes of FIG. 8.

As described with reference to FIGS. 5, 6, and 7, the first transmitting diode 821 and the first receiving diode 822 use different light wavelengths in order not to be affected by interference. For example, the first transmitting diode 821 uses an optical wavelength of 850 nm, and the first receiving diode 822 uses an optical wavelength of 1220 nm. At this time, the light transmitted from the first transmitting diode 821 is incident on the second receiving diode 921. Therefore, as shown in FIG. 9, the same wavelength is employed for the first transmitting diode 821 and the second receiving diode 921. Similarly, the same wavelength is employed for the second transmitting diode 922 and the first receiving diode 822.

Methods according to an embodiment of the present invention can be implemented in the form of program instructions that can be executed by various computer means and recorded in a computer readable medium. The computer readable medium may include program instructions, data files, data structures, etc. alone or in combination. Program instructions recorded on the media may be those specially designed and constructed for the purposes of the present invention, or they may be of the kind well-known and available to those having skill in the computer software arts.

As described above, the present invention has been described by way of limited embodiments and drawings, but the present invention is not limited to the above embodiments, and those skilled in the art to which the present invention pertains various modifications and variations from such descriptions. This is possible.

Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the claims below but also by the equivalents of the claims.

200: module 210: transmission diode
220: reception diode 230: lens
800: first FSO transceiver device 900: second FSO transceiver device

Claims (7)

In the dual communication FSO transceiver using a single optical system,
Single optic lens;
A transmission diode configured to output a transmission signal to transmission light;
A transmission / reception unit configured to emit transmission light carrying the transmission signal to the outside through an optical system and to receive reception light carrying the reception signal from the outside through the optical system; And
Receiving diode for converting the receiving signal of the received reception light into an electrical signal
Including;
The transmitting diode and the receiving diode are located on an optical path of the single optical lens, and the transmitting diode and the receiving diode are located within the circumference of the receiving light, wherein the transmitting diode is an optical axis of the receiving light. And a receiving diode positioned to deviate from an optical axis of the received light. The method of claim 1,
The receiving diode is located on the same surface as the transmitting diode, the FSO transceiver for dual communication is located on the optical path of the received light. The method of claim 1,
The transmission diode and the reception diode FSO transmission and reception device for dual communication using different wavelengths of light so as not to interfere with each other. The method of claim 3,
The wavelength used in the transmitting diode has a peak range response characteristic among the wavelength characteristics of the receiving diode, and the wavelength used in the receiving diode has a narrow band peak response characteristic. FSO transceiver for dual communication. The method according to claim 3 or 4,
The wavelength of the transmitting diode is the same as the wavelength of the receiving diode of the external transmitting and receiving device located outside, the wavelength of the receiving diode is the same as the wavelength of the transmitting diode of the external transmitting and receiving device for dual communication FSO Device. The method of claim 1,
The transmitting diode and the receiving diode is an FSO transceiver for dual communication is provided in one module. Single optic lens;
A transmission diode which loads a transmission signal into transmission light and outputs the signal to the single optical lens; And
Receiving diode that converts the receiving signal of the received light received through the single optical lens to an electrical signal
Including;
The transmitting diode and the receiving diode are located on an optical path of the single optical lens, and the transmitting diode and the receiving diode are located within the circumference of the receiving light, wherein the transmitting diode is an optical axis of the receiving light. Located in, wherein the receiving diode is located away from the optical axis of the received light, the communication module for dual communication FSO transmission and reception.

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