KR20040028975A - Integrated optical transmitter, receiver for free space optical communication and network system and application apparatus thereof - Google Patents

Abstract

PURPOSE: An integrated transmitter and receiver for an FSON(Free Space Optical Network) and an application device therefor are provided to configure an IC chip including a circuit related to a wireless optical transceiving function in one chip, and to form a light source and an optical element on one substrate, thereby easily assembling a PCB and an optical system to standardized modules. CONSTITUTION: A light source driving and automatic output controlling IC(130) is formed on a semiconductor substrate(101). The IC(130) includes an input amplifier and an LD(Laser Diode) driving circuit. The input amplifier receives an input signal, and amplifies the input signal. The LD driving circuit drives an LD(110) by using the amplified signal. A signal detected through a PD(Photo Detector)(120) is amplified through an optical detection amplifier, is transmitted to an automatic output control circuit, and controls the LD driving circuit. The LD(110) transmits light including a wireless optical communication signal to a free space outside of a transmitter(100). The light emitted from the LD(110) is collimated through an optical system(140), and is transmitted to the free space.

Description

Integrated free-space wireless optical transmitters and receivers and their applications {INTEGRATED OPTICAL TRANSMITTER, RECEIVER FOR FREE SPACE OPTICAL COMMUNICATION AND NETWORK SYSTEM AND APPLICATION APPARATUS THEREOF}

The future telecommunications society in the 21st century is demanding a social environment in which subscribers can exchange a large amount of high-speed information, which is made possible by the development of high-speed optical communication technology using optical fiber and wireless communication technology of high frequency band. Optical communication research started in the 1970s has been developed over the past 10 years to minimize transmission loss to increase transmission distance and transmit at high speed and high capacity, and has already been put into practical use. In the '90s, we were looking at Tbps. However, there are still few technologies that provide end users or subscribers with more than tens of Mbps of information.

The key role of optical communication technology that guarantees high speed, parallelism, and high capacity of information transmission in the construction of high speed broadband integrated network is indisputable.

In the existing wireless communication system, data transmission in the PCS system of 2GHz band is currently insufficient to provide wireless multimedia service at tens of kbps.

In this regard, research on IMT-2000, which has a data transfer rate of up to 2 Mbps, which is a third generation wireless communication, has been actively carried out at home and abroad, and is in a commercialization stage. However, in the next generation multimedia system for ultra-high speed data transmission such as HDTV, subscribers need to transmit data of tens to hundreds of Mbps, so IMT-2000 may not be the ultimate solution.

Next-generation multimedia is a system and service that integrates various forms of information such as text, data, audio, graphic, photograph, animation, and video to produce, collect, transmit, and process the multimedia industry. Point. Recently, the multimedia information industry is moving toward the generalization of digitalization, bidirectionalization, asynchronousization, and video-sound in the content, form, and exchange method of information due to technological developments in the computer and communication fields. The impact of these technological developments on the industrial structure is revolutionary. The most important obstacles in the current multimedia services are the performance of insufficient capacity networks, and the towing vehicle capable of expanding and reproducing next-generation multimedia can provide economically personalized subscribers with high speed and high capacity. Depends on having

Only FTTH (fiber-to-the-home) is considered the only method for communication network technology that can provide such high-speed, high-capacity information to individual subscribers. This occurs, so there is a problem that the installation cost is large. In addition, in the optical transmission module, a process of aligning an optical fiber with a laser diode (LD) and a photo detector (PD) is additionally required. The present invention provides a connection between a base station (CBS) such as a base station (BS) and a mobile service switching center (mobile service switching center), such as a conventional coaxial cable network or an ultra-high frequency oscillator and modulator ( Instead of a wireless communication network using a microwave (MW) transmission and reception device such as a modulator, a very economical wireless transmission and reception module for free space wireless optical communication that can solve the problem of FTTH by more economical and easy installation Aim to.

To date, free space wireless optical communication is quick and easy to install, so it can provide services directly, and has the advantage of securing physical communication security, and it is used for back-up of existing wired network or requires quick installation. The practical aspects were not so large since the main focus was on the development of high-power transceivers with a focus on point-to-point connections.

Therefore, in the present invention, a new concept of economical free space suitable for stably providing a large amount of information to a large number of subscribers or users using a FSON system using OWLL and OWLL different from the existing simple point-to-point method. It is proposed a transceiver module for wireless optical communication.

The present invention provides a wireless optical communication link (OWLL; Optical WireLess Link) using a method of transmitting and receiving an optical signal through free space, that is, air, and a free space optical network (FSON) system using the same. The present invention relates to an optical communication transmitter and receiver and an apparatus using the same.

1 is a conceptual diagram showing the structure of a transmitter for a wireless optical communication according to an embodiment of the present invention.

FIG. 2 is a block diagram illustrating an example of a light source driving and control circuit in the wireless optical communication transmitter of FIG. 1.

3 and 4 is a conceptual diagram showing the structure of a transmitter for a wireless optical communication according to another embodiment of the present invention.

5 is a conceptual diagram illustrating a structure of a wireless optical communication receiver according to an embodiment of the present invention.

FIG. 6 is a block diagram illustrating an example of a receiver circuit in the receiver for wireless optical communication of FIG. 5.

7 and 8 are conceptual views showing the structure of a receiver for a wireless optical communication according to another embodiment of the present invention.

9 is a conceptual diagram illustrating a structure of a transceiver for wireless optical communication according to an embodiment of the present invention.

10 is a conceptual diagram illustrating a structure of a wireless optical communication transceiver according to another embodiment of the present invention.

11 is a conceptual diagram illustrating a structure of a wireless optical communication transceiver connectable through an optical fiber link according to an embodiment of the present invention.

12 is a conceptual diagram illustrating a structure of a wireless optical communication transceiver connectable through an optical fiber link according to another embodiment of the present invention.

13 is a conceptual diagram illustrating a structure of a wireless optical communication transceiver connectable with Ethernet according to an embodiment of the present invention.

14 is a conceptual diagram illustrating a structure of a transponder for wireless optical communication according to an embodiment of the present invention.

15 and 16 are conceptual views illustrating structures of a transmitter and a receiver of a wireless optical communication transponder in which a transmitter and a receiver are separated according to an embodiment of the present invention, respectively.

17 is a plan view illustrating a structure of a wireless optical communication receiver according to another embodiment of the present invention.

18 to 20 are cross-sectional views showing the structure of a wireless optical communication receiver according to another embodiment of the present invention.

[Mode for Carrying Out the Invention]

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

First, the structure of a transmitter for a wireless optical communication according to an embodiment of the present invention will be described. 1 is a conceptual diagram of a wireless optical communication transmitter 100 according to an embodiment of the present invention, Figure 2 is a block diagram showing an example of a light source driving and automatic output control circuit used in the transmitter of FIG.

As shown in FIG. 1, in the transmitter 100, an integrated circuit 130 for driving light sources and controlling automatic output is formed on a semiconductor substrate 101 made of silicon (Si) or the like. The light source driving and automatic output control circuit 130 can be formed in various ways, one example of which is shown in FIG. That is, it includes an input amplifier 1302 for receiving an input signal from the outside and amplifying it, and an LD driving circuit 1304 for driving the LD 110 as a light source using the signal amplified by the input amplifier 1302. The signal detected through the PD 120 is amplified by the photodetector amplifier 1306 and then transferred to the automatic output control circuit 1308 to control the LD driving circuit 1304. In addition, the integrated circuit 130 for light source driving and automatic output control is manufactured according to a known integrated circuit manufacturing process.

A laser diode (LD) is a light source for transmitting light containing a wireless optical communication signal to a free space outside the transmitter 100 on the substrate 101 on which the light source driving and automatic output control integrated circuits 130 are formed. 110 is formed. Light emitted from the LD 110 is collimated through the optical system 140 and transmitted to free space. In addition to LDs, light emitting diodes (LEDs) may be used as light sources, and LDs may include various types of LDs such as Febry-Perot LD, distributed feedback LD (DFB-LD), and vertical cavity surface emitting laser (VCSEL). You can use both.

What kind of light source to use for the transmitter is also related to the transmitter's transmission distance. The transmitters can be classified into super short distance (100m or less), short distance (50-300m), medium distance (150-500m), and long distance (500-2000m) for each transmission distance.For example, the nominal wavelength is 0.85 * It is recommended to use VCSEL of 10-6m as a light source. When the transmitter according to the present invention is used in a medium distance of 500m or less or short-range wireless optical communication of 300m or less, the nominal wavelength of light emitted from the LD may be 1,3 * 10-6m or 1.55 * 10-6m. Light emitted from the light source preferably satisfies safety standards for the human body, including the eyes.

In addition, a photodetector (PD) 120 capable of detecting light emitted from the LD 110 is formed on the substrate 101 to be adjacent to the LD 110 at a slight distance from each other. As the PD 120, various devices such as metal-semiconductor-metal (MSM) PD, inversely biased PN junction (PIN) PD, and avalanche photodiode (APD) may be used, and the PD 120 may emit light from the LD 110. As described above when the configuration of the light source driving and automatic output control circuit 130 is detected, this is used as a signal for controlling the output of the LD 110.

The light source driving and automatic output control circuit 130 formed on the substrate 101 has a plurality of bonding pads 103 for providing connection with the circuit, and the LD 110 and the PD 120 are such bonding. The pad 103 is connected to a portion for providing a connection with a corresponding connection portion in the light source driving and automatic output control circuit 130. That is, the LD 110 is connected to the LD driving circuit 1304 of FIG. 2, and the PD 120 is connected to the photodetector amplifier 1306 of FIG. 2. Since the LD 110 is positioned at a portion connected to the optical system, the connection unit 109 may be separately formed for driving the light source and connecting the automatic output control circuit 130.

The process of forming the light source driving and the automatic output control circuit 130 on the substrate 101 follows a general semiconductor manufacturing process, and the PD 120 may be formed together in a circuit manufacturing process in some cases. In the case of the LD 110, a separately formed LD element is attached onto the substrate 101. The manufactured substrate 101 is again fixed on the IC frame 107. The bonding pad 103 provided in the integrated circuit 130 is wire-bonded 105 with the bonding pad 104 of the IC frame to form the IC frame 107. It may be connected to the outside through the pin 108 of.

On the other hand, the optical system 140 is composed of two parts, the lens 141 and the lens holder 142, the substrate 101 on which the light source 110, PD 120, integrated circuit 130 is formed is fixed It is fixed to the IC frame 107. As the lens 141, a conventional aspherical lens, a Fresnel lens, or the like can be used. If Fresnel lens is used, it is easy to manufacture the lens by injection method, so there is an advantage of reducing the manufacturing cost of the transmitter. At this time, it is preferable to manufacture the transmitter by standardizing the size of the lens to be used for each transmission distance. In addition, the lens holder 142 is formed to adjust the position of the lens 141 back and forth in the optical system block 140 so that the focal length of the lens 141 can be adjusted according to the use of the transmitter.

Light from the light source 110 is collimated to an appropriate extent to be received by the receiver through the lens 141, where the nominal beam divergence of the light from the transmitter 100 is 1 * 10-3 radians. to be.

On the other hand, the optical system 140 and the IC frame 107 is made of a standardized block that can be easily assembled with each other to assemble and fix the two parts. 3 and 4 show examples of transmitters 300 and 400 having a screw portion for assembling the optical system and the IC frame portion. As shown in Fig. 3 or Fig. 4, the screw portions (Fig. 3: 350, Fig. 4) on the optical system (Fig. 3: 340, Fig. 4: 440) side and the IC frame (Fig. 3: 307, Fig. 4: 407) side, respectively. 450) is formed so that the two parts can be assembled by turning the screws. The screw portion may be formed integrally with the IC frame and the optical system, or may be formed to be assembled with the IC frame and the optical system. 3 and 4 show the assembled form by turning the screw. 3 to 4, the remaining components have a structure similar to that described with reference to FIG. 1, and similar components are denoted by like reference numerals. On the other hand, in order to form the screw portion on the optical system and the IC frame side, a frame surrounding the optical system or the IC frame may be further formed, and the screw portion may be formed on the frame.

When forming the screw part, the screw part of the same specification is formed for the IC frame including the optical system having the lens of various sizes or the IC formed by standardizing the transmission distance, so that the two parts can be properly assembled as necessary. In this case, a lens with a small diameter or a large lens can be arbitrarily attached to the same IC frame according to requirements such as transmission distance and reliability. That is, according to the present invention, since it can be manufactured to easily assemble the IC frame side and the optical system by a method such as forming a screw portion, it is possible to manufacture a transmitter of a suitable standard very simply.

In addition, in order to install the transmitter outdoors, it is preferable to provide an output window that is transparent to the wavelength of the light source outside the optical system, and a protective cover or heater for coping with moisture or temperature change may be provided.

Now, a wireless optical communication receiver according to an embodiment of the present invention will be described in detail. 5 is a conceptual diagram of a wireless optical communication receiver according to an embodiment of the present invention, and FIG. 6 is a block diagram showing an example of an optical receiver circuit used in the receiver of FIG.

In the receiver 500, for example, a receiver integrated circuit 530 having a configuration as shown in FIG. 6 is formed on a substrate 501 made of silicon (Si) or the like. The receiver circuit 530 may retransmit the signal transmitted from the preamplifier (TIA) 5302 and the preamplifier 5302 to amplify the input signal transmitted from the photodetector element 510. A signal amplifier 5304 for amplifying, an automatic gain controller 5306 for adjusting the gain of the received signal, a data recovery circuit 5308 for recovering data from the received signal, and data recovery by extracting a clock from the received signal And a clock generation circuit 5310 provided to the circuit 5308. This receiver integrated circuit 530 is also manufactured according to known integrated circuit manufacturing processes.

A photodetector (PD) 510 is formed on the substrate 501 to detect light received from a free space outside the receiver 500. As the PD 510, various devices, such as a metal-semiconductor-metal (MSM) PD, an inversely-biased P-N junction (PIN) PD, and an avalanche photodiode (APD), may be used as the PD 510. A connection unit 509 is formed to connect the PD 510 and the receiver integrated circuit 530.

The process of forming the PD 510 and the receiver integrated circuit 530 on the substrate 101 follows a general semiconductor manufacturing process, and the PD 510 and the receiver integrated circuit 530 may be manufactured through the same manufacturing process. . The completed substrate 101 is again fixed on the IC frame 107, and the bonding pad 503 provided in the integrated circuit 530 and the bonding pad 504 of the IC frame 507 are wire bonded 505 to form an IC. The receiver circuit 530 is connected to the outside through the pin 508 of the frame 507.

Light received from the outside is collected through the optical system 540 and transmitted to the PD 510. The optical system 540 includes a lens 541 and a lens holder 542 similarly to the case of the transmitter 100. As the lens 541, an aspherical lens or a Fresnel lens can be used as in the transmitter 100. When the Fresnel lens is used, the efficiency of beam collection can be maximized, and it is very economical such as injection. Since it can be manufactured by the method, it can be more economical than other types of lenses, which can greatly help in securing the economics of the FSON transceiver. In addition, Fresnel lenses have a large numerical aperture, so the acceptance angle is large, so that optical signals can be easily and economically received.

The receiver, like the transmitter, is also preferably manufactured from standardized blocks that can be easily assembled with the IC frame. 7 and 8 show an example of a receiver having a screw portion for assembling the optical system and the IC frame portion. As shown in Fig. 7 or Fig. 8, the screw portions (Fig. 7: 750, Fig. 8) on the optical system (Fig. 7: 740, Fig. 8: 840) side and the IC frame (Fig. 7: 707, Fig. 807) side respectively. 850) is formed so that the two parts can be assembled by turning the screw.

As in the case of the transmitter, the screw portion may be formed integrally with the IC frame and the optical system or may be assembled, and various combinations may be made using a standardized screw portion. 7 and 8 illustrate the assembled form by turning the screw, in FIGS. 7 to 8, the remaining components have a structure similar to that described with reference to FIG. 5, and similar components have similar reference numerals. Is indicated. On the other hand, in order to form the screw portion on the optical system and the IC frame side, a frame surrounding the optical system or the IC frame may be further formed, and the screw portion may be formed on the frame.

A very important function in a free space wireless optical communication system is that the transceiver must always be reliable. In the case of the OWLL, unlike the optical fiber communication link, there is an element that can be degraded as the size of the received signal worsens. Therefore, it is important to monitor whether the alignment of the OWLL transceiver is always in good condition. To this end, in an embodiment of the present invention, a monitoring terminal (not shown) may be provided so that the reception signal size can be always monitored. In addition, the monitoring terminal may be connected to a display device (not shown) to externally display the magnitude of the signal being received by the receiver. As the display device, a visible light LED or the like can be used. In addition to displaying the magnitude of the signal being received externally, it is also possible to determine the degree of signal attenuation on the receiver circuitry and report it to the central base station overseeing the entire FSON system.

Transceivers for wired optical communication using conventional optical fibers typically require a lot of manufacturing time to align and pig-tail the LD and optical fibers or PD and optical fibers with a few m precision. This necessitates a very high production cost. On the other hand, the transceiver for OWLL and FSON as presented in the present invention has the advantage that it can be manufactured very economically. As described above, the transceiver for the OWLL and the FSON proposed by the present invention is very economical compared to the conventional wired optical communication transceiver, and thus, the FSON system is very important to secure the economy more than the FTTH (fiber-to-the-home) system.

In the case of the receiver, it is desirable to selectively accept only the light emitted by the transmitter. The light emitted by the transmitter is light having a nominal wavelength of 0.85 * 10-6m, 1.3 * 10-6m, and 1.55 * 10-6m as described above. For this purpose, it is advisable to install an input window in front of the receiver's optics that is only transparent to the light emitted by the transmitter and blocks normal natural light. In order to install and use outdoors, the receiver may need to install a device such as a cover or a heater.

9 shows an integrated transceiver (TRX) for OWLL and FSON systems in which the transmitter and receiver are in one module. OWLL and FSON are basically two-way communications, so they are much more likely to be used together than when the transmitter and receiver are used separately. For this purpose, the transmitter and receiver shown in FIGS. 1 and 5 are integrally configured with the transceiver of FIG. 9.

As shown in FIG. 9, a circuit 930 for transmitting / receiving is integrally formed on one semiconductor substrate 901 and includes an LD 910 and a PD 920 for an optical transmission module and a PD for an optical receiving module. 960 is also formed on the substrate 901 together. The IC frame 907 to which the semiconductor substrate 901 is fixed is assembled together with the transmission optical system 940 and the reception optical system 990. The other structure is similar to that portion of transmitter 100 and receiver 500. Such a configuration can make the size of the optical transceiver very small, and therefore, this structure is useful when the size of the optical system can be made extremely small.

However, transceivers often face each other when configuring a wireless optical communication link. In this case, the optical signal may be input not only to the reception optical system of the transceiver but also to the light source on the side of the transmission optical system, and the size of the optical system may need to be set to several tens of cm as needed. Therefore, in this case, it is necessary to secure a certain space between the transmitting part and the receiving part of the transceiver. For this purpose, it is advantageous to separate the circuit of the transmitting part and the circuit of the receiving part.

Fig. 10 shows an example of a transceiver in which the circuits of the transmitting part and the circuits of the receiving part are separated in this way. As shown in FIG. 10, the integrated circuit 1030 for driving the light source of the transmitting portion and the automatic output control and the receiver integrated circuit 1080 for the receiving portion are formed on separate semiconductor substrates 1001 and 1051, respectively. The LD 1010 and the PD 1020 are formed together on the substrate 1001 of the transmitting portion, and are connected to the integrated circuit 1030 for driving the light source and the automatic output control, and the PD 1060 is formed on the substrate 1051 of the receiving portion. And are connected to the receiver integrated circuit 1080. Each of the substrates 1001 and 1051 formed as described above is fixed on the IC frames 1007 and 1057, respectively. The IC frames 1007 and 1057 are disposed on one substrate 1050 at appropriate intervals. The distance between the transmitting portion and the receiving portion can be appropriately determined by the size of the optical system constituting the transceiver. Then, the optical system 1040 and the optical system 1090 for transmission are coupled to the light source 1010 of the transmission portion and the light detecting element 1060 of the reception portion, respectively.

In the transceivers 900 and 1000 illustrated in FIGS. 9 and 10, as in the transmitter 100 and the receiver 500 described above, the transmission optical systems 940 and 1040 and the reception optical systems 990 and 1090 are respectively standardized. It can be assembled with the module according to the IC frame or the board, the assembly method can also use the same method used in the transmitter 100 or the receiver 500. In addition, the transceivers 900 and 1000 of the present invention shown in FIGS. 9 and 10 may have all the same features of the transmitter 100 and the receiver 500 described above.

The transmission optical system 940, 1040 and the reception optical system 990, 1090 may use the thing of the same specification as needed, and the thing of another specification may be used. In the transceivers 900 and 1000 shown in Figs. 9 and 10, although the transmission optical systems 940 and 1040 and the receiving optical systems 990 and 1090 are provided in the same direction, the transmission optical system and the receiving optical system are different from each other if necessary. It can also be installed in the direction. For this purpose, the position of the circuit and optical element formed on a board | substrate can be adjusted suitably.

Meanwhile, the wireless optical communication link and free space wireless optical communication network system of the present invention may be used in combination with an optical communication system using an existing optical fiber. To this end, the transceiver of the present invention may include a configuration of a transceiver for optical fiber communication for providing an optical fiber link.

11 illustrates a structure of a wireless optical communication transceiver connectable through an optical fiber link according to an embodiment of the present invention. As shown in FIG. 11, the second light source driving and automatic output control circuit portion and the second receiver circuit portion for the optical fiber communication together with the first light source driving and automatic output control circuit portion and the first receiver circuit portion for the wireless optical communication are one semiconductor substrate. It is integrally formed on the 1110. Also formed on the substrate 1101 is an LD 1110 connected to the first light source driving and automatic output control circuitry and a PD 1120 and a PD 1160 connected to the first receiver circuitry. The substrate 1101 is fixed on the IC frame 1107 and wire-bonded 1105. The transmission optical system 1140 and the reception optical system 1190 are coupled to the wireless optical communication side of the IC frame 1107, respectively, and optical fiber communication. On the side, the PD 1172 is connected to the second receiver circuit portion, and the LD 1176 is connected to the second light source driving and automatic output control circuit portion, and receives signals transmitted from the optical fiber links, respectively, and transmits them to the first light source driving and automatic output control circuit portion. Alternatively, the signal transmitted from the first receiver circuit portion may be transmitted to the optical fiber link. For this purpose, the PD 1172 and the LD 1176 are connected to the optical fiber link through the optical fiber adapters 1174 and 1178, respectively. At this time, the PD 1172 and the LD 1176 for optical fiber communication may use a package mounted in a thiocan (TO-can).

It is also possible to form optical elements such as PD or LD for optical fiber communication together on a semiconductor substrate without connecting them to the outside of the substrate. 12 illustrates a structure of a transceiver in which all optical elements for an optical fiber link are formed together on a semiconductor substrate.

As shown in FIG. 12, on the semiconductor substrate 1201 in which the circuit portion 1230 is formed, a light source 1276 and a photodetecting element 1277 on the transmitting side for optical fiber communication, and a photodetecting element 1272 on the receiving side. ) To form all. Next, the light source 1276 and the photodetector element 1272 are connected to the optical fiber link through the optical fiber adapters 1278 and 1274, respectively.

In the case of the optical transceivers 1100 and 1200 shown in FIGS. 11 and 12, as in the transceiver 1000 shown in FIG. It is also possible to fix and form on a phase. That is, the first light source driving and automatic output control circuit and the second receiver circuit are formed on one semiconductor substrate, and the first receiver circuit and the second light source driving and automatic output control circuit are formed on the other semiconductor substrate. Then, each part is fixed to another board | substrate. Likewise, this structure is useful when it is necessary to secure a certain distance between the transmitting part and the receiving part.

In addition, the wireless optical communication link and free space wireless optical communication network system of the present invention can be effectively used in combination with Ethernet or LAN. To do this, a media converter is used to convert the Ethernet signal and the signal of the optical transceiver of the present invention. An apparatus 1300 for this is shown in FIG. 13.

That is, the media converter circuit portion for data conversion together with the light source driving and automatic output control circuit portion and the receiver circuit portion are formed on the semiconductor substrate 1301. Pin 1308 connected to the media converter circuitry side of the IC 1330 connects the media converter circuitry to a port 1370 for an unshielded twisted-pair cable (UTP) for connection with Ethernet.

However, since it is difficult to use a UTP cable for a certain distance or more, there is a case where a fiber optic link is required to be connected between a wireless optical communication transceiver and a media converter. For example, the location where the transceiver for wireless optical communication is located is more than a certain distance from where the subscriber is located, such as on the roof of a building. In this case, it is necessary to transmit the data signal of the transceiver to the media converter near the subscriber as optical. In this case, an optical transceiver having a communication function with the optical fiber link described above with reference to FIGS. 11 and 12 may be connected to an external media converter.

Subscriber networks using FSON can be tried in many different forms. Both star and ring networks using ATM (asynchronous transfer mode) are possible, and tree, bus and mesh networks are also available. Do. When constructing such a network, one node may need to send and receive large bandwidth data from a central base station, utilize some of the data in the node itself, and relay the other data back to the other node. In this case, multiplexing / demultiplexing functions are required for the transmitting and receiving module. Fig. 14 shows an example of the wireless optical communication transponder of the present invention having such a multiplexing / demultiplexing function.

As shown in FIG. 14, an integrated circuit including a light source driving and automatic output control circuit unit on the transmitting side and a receiver circuit unit on the receiving side and a MUX / DEMUX circuit unit for implementing a multiplexing / demultiplexing function on the semiconductor substrate 1401 ( 1430. The MUX / DEMUX circuit unit multiplexes the data transmitted from the input pin and transmits it to the light source driving and automatic output control circuit unit on the transmitting side, and demultiplexes the signal transmitted from the receiver circuit unit on the receiving side and sends it out through the output pin. LD 1410 and PDs 1420 and 1460 are formed on the semiconductor substrate 1401, and the rest of the structure is similar to the transceiver 1000 as shown in FIG.

On the other hand, when the subscriber network is configured as a ring network using the ATM method, a signal packet that can be transmitted by adding a signal of some bandwidth among the received signals to the subscriber and adding the signal received from the subscriber again (ADD / DROP) function is essential. 15 and 16 show an example of a wireless optical communication transponder including such a function. However, in general, in the case of a ring network system, since the transmission direction and the reception direction indicate different directions, it may be difficult to install a transceiver for the FSON system. In consideration of these problems, when the transmitter and receiver are separately configured, the transceiver can be easily installed.

Accordingly, an embodiment of the present invention shows a transponder in a form in which a transmitting part and a receiving part are separated, and FIGS. 15 and 16 illustrate structures of a transmitting part and a receiving part of such a transponder, respectively.

As shown in Fig. 15, the transmission portion includes LD 1510 and PD 1520 formed on the semiconductor substrate 1501, and includes a light source driving and automatic output control circuit and a multiplexer (MUX) circuit for transmission. Integrated circuit (IC) 1530 is formed. In the IC frame 1507 where the IC 1530 is fixed, a data in pin for receiving data from a receiver and a data add pin for receiving data to be added at a location where a corresponding transceiver is installed are provided. do. The IC frame 1507 is assembled with the transmission optical system 1540.

The receiving portion is shown in FIG. 16, where a PD 1610 is formed on a semiconductor substrate 1601, and an integrated circuit (IC) 1630 including a receiver circuit for receiving and a demultiplexer (DEMUX) circuit is formed. It is. The IC frame 1607 to which the IC 1630 is fixed is provided with a data out pin for providing data to a transmitter and a data drop pin for providing data to a location where a corresponding transceiver is installed. IC frame 1607 is coupled to receive optical system 1640.

As such, when the transmitting part and the receiving part are separated and formed as separate modules, the transceiver can be easily installed even when the transmitting direction and the receiving direction are different.

On the other hand, the receiver according to the embodiment described so far has used a configuration in which the receiving optical system, the photodetecting element and the receiver circuit are arranged side by side, but the receiving optical system is perpendicular to the substrate on which the photodetecting element and the receiver circuit are formed. You can also place it. In this case, the substrate may additionally have a function of filtering visible light and the like, and it is also possible to form a lens directly on the semiconductor substrate by etching or coating. Hereinafter, such an embodiment will be described in detail.

FIG. 17 is a plan view illustrating a structure of a receiver according to another embodiment of the present invention in a direction of a substrate on which photodetecting elements and a receiver circuit are formed, and FIG. 18 is a cross-sectional view taken along the line 'VIII' of FIG.

As shown in FIG. 17, a receiver integrated circuit 1730 and a photodetector element 1710 are formed on a semiconductor substrate 1701, and the substrate 1701 is fixed to an IC frame 1707 and wire bonded 1705. have. The structure of this substrate is similar to the receiver 500 of FIG. 5 described above. 17 and 18, the lens 1840 of the optical system is formed in the direction perpendicular to the substrate 1701, as can be seen from the cross-sectional structure. In addition, an opening 1850 is formed in the IC frame 1707 so as to expose the substrate region where the PD 1710 is formed. In this way, the light collected through the lens 1840 is transmitted to the PD 1710 through the substrate 1701 made of silicon (Si) or the like.

Therefore, by appropriately selecting the material of the substrate, it is possible to selectively pass only the desired light.

Meanwhile, the lens may be directly formed using a semiconductor substrate without installing a separate lens outside the substrate. In this way, the manufacturing process of the optical receiver can be simplified, and the size of the receiver can be further reduced.

19 is a cross-sectional view of a receiver of the present invention in which a lens is formed in an etched manner on an opposite side of a semiconductor substrate on which a receiver circuit and a PD are formed. The planar structure of the receiver shown in FIG. 19 is similar to that shown in FIG. However, the lens 1940 is formed on the surface opposite to the surface on which the PD 1910 and the IC 1930 of the substrate 1901 are formed (upper surface in the figure) by etching.

The lens 1940 may be formed by an etching process in a general semiconductor manufacturing process. On the other hand, an opening is formed in the IC frame 1907 to which the substrate 1901 is fixed so as to expose the lens 1940. Since the lens 1940 is formed using the substrate 1901 on which the IC is formed without using any material, the receiver can be miniaturized and the manufacturing process is simplified.

The lens can also be formed by a coating method. According to the embodiment shown in FIG. 20, a lens (by coating) is formed on the opposite side (lower side of the figure) to the side (upper side of the figure) on which the PD 2010 and the IC 2030 of the substrate 2001 are formed. 2040. The lens 2040 may be formed by a coating process in a general semiconductor manufacturing process. The planar structure of the receiver is similar to that shown in FIG. 17, and here also forms an opening for exposing the lens 2040 in the IC frame 2007 to which the substrate 2001 is fixed.

It is clear that the features of the receiver described with reference to FIGS. 17 to 20 are also applicable to the receiver or the application apparatus of the receiver described above.

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, it will be understood by those skilled in the art that various modifications or changes may be made without departing from the spirit of the present invention.

The OWLL and FSON system of a new concept derived to solve the problems and limitations of the prior art have a difference from existing wired and wireless communication networks in preparation for the next generation multimedia era, and have high-speed Internet, point-to-point and point-to-point. -Free space wireless optical communication method that can provide complex multimedia communication service such as multi-point data, audio, video transmission with high speed and large capacity with stability and efficiency.

In the high-speed high-capacity communication system, the basic block is set according to the transmission distance and the transmission rate, and various combinations of these blocks can be used to provide the high-speed high-capacity information without being affected by the location and distance of the subscriber. Is a whole new concept of communication system. These OWLL and FSON systems must be robust against atmospheric turbulence, temperature gradients, snow, rain, fog, etc., and the intensity of light output, direction of light output, and bitrate depending on the surrounding conditions. (bit-rate), etc. to be able to adaptively change. In addition, it needs to be composed of a system that can comprehensively monitor, monitor and operate the transmission and reception status.

In order to achieve this goal, it is essential to provide an economical transmitter and receiver for OWLL and FSON systems that enable OWLL and FSON systems and various applications using them. Accordingly, an object of the present invention is to provide a transmitter, a receiver, and an application thereof for OWLL and FSON.

Another object of the present invention is to provide a transmitter, a receiver for a wireless optical communication, a receiver, and an application apparatus thereof, which can be miniaturized, light weight, low cost, stabilized and reliable.

In order to achieve the above object, in the present invention, an integrated circuit (IC) chip including a circuit related to wireless optical transmission and reception within one chip, and an optical device such as a light source such as a laser diode or a photodetecting device The present invention provides a variety of transmission and reception apparatuses for providing OWLL and FSON information and communication services, which are integrated on a substrate and are easily assembled by fabricating such a printed circuit board and an optical system into a standardized module.

That is, the wireless optical communication transmitter according to the present invention includes a semiconductor substrate, a light source formed on the substrate, a light detecting element formed on the substrate, capable of detecting light emitted from the light source, and integrally formed on the substrate and receiving signals from the outside. A light source driving and automatic output control circuit for controlling the output of the light source by driving a light source and receiving a signal from the light detecting element, and a substrate on which the light source, the light detecting element, the light source driving and the automatic output control circuit are formed is fixed. It includes a frame having a plurality of pins for electrical connection to the outside, and is formed to be assembled with the frame, and comprises an optical system for receiving the light from the light source and transmitting to the outside free space.

Herein, the light source is preferably a laser diode, and the optical system includes a lens holder capable of adjusting the focal length of the lens, and an aspheric lens or a Fresnel lens may be used as the lens.

In addition, the transmitter of the present invention includes a first threaded portion formed integrally with the frame or assembling, and a second threaded portion integrally or assembling with the optical system, and includes a frame using the first and second threaded portions. And the optical system are preferably assembled. Light from the transmitter meets eye safety standards.

On the other hand, the wireless optical communication receiver according to the present invention is integrated with a semiconductor substrate having a first surface and a second surface facing each other, a photodetecting element formed on the first surface of the substrate, and a first surface of the substrate. And an optical communication receiver circuit capable of converting and outputting a signal input from the photodetecting device, and a substrate on which the photodetecting device and the optical communication receiver circuit are formed is fixed and a plurality of pins for electrical connection to the outside are fixed. It has a frame, which is formed to be assembled with the frame, and includes an optical system for receiving light from an external free space and transmitting it to the photodetecting device.

Here, the optical communication receiver circuit has a terminal for externally monitoring the magnitude of the input signal, and is connected to the monitoring terminal through one or more of the plurality of pins of the frame to externally scale the magnitude of the input signal. It is preferable to further include a display device that can display, or to transmit the magnitude of the input signal to the base station outside the receiver.

In addition, the receiver of the present invention has a first threaded portion that is integrally formed or assembleable with the frame and a second threaded portion that is integrally formed or assembleable with the optical system, so that the frame and the optical system have the first and second threaded portions. Can be assembled using

On the other hand, the optical system is disposed in line with the optical communication receiver circuit and the photodetecting element formed on the substrate, or arranged in parallel with the second surface on the second surface side of the substrate. In the latter case, the frame has an opening that exposes at least a portion of the second side facing the portion where the light source of the first side is formed, and the optical system is a lens formed on the second side of the substrate and such a lens is the opening. Are exposed by The lens can be formed by etching or coating.

The wireless optical communication transceiver according to the present invention includes a semiconductor substrate, a light source formed on the substrate, a first photodetecting element formed on the substrate and capable of detecting light emitted from the light source, integrated on the substrate, and receiving a signal from the outside. A light source driving and automatic output control circuit for controlling the output of the light source by driving a light source and receiving a signal from the first photodetecting device, a second photodetecting device formed on the substrate, and integrally formed on the substrate; 2 receiver circuit for optical communication which converts and outputs the signal input from the photodetecting device, the frame is fixed and has a plurality of pins for electrical connection to the outside, and is formed to be assembled with the frame A transmission optical system that receives light from a light source and transmits it to an external free space It is formed so as to be assembled with the frame and comprises a receiving optical system for receiving light from an external free space and transmitting to the second photodetecting device.

Here, the transceiver is formed integrally with the frame or assembling, and is formed on the first screw portion, which is formed adjacent to the portion where the light source of the substrate is formed, integrally or assembling with the frame, 1 A second threaded portion formed adjacent to the portion where the photodetecting element is formed, a third threaded portion formed integrally or assembling with the transmission optical system, and a fourth threaded portion integrally formed or assemble with the receiving optical system It further comprises, the frame and the transmission optical system is assembled using the first and the third thread, the frame and the receiving optical system is preferably assembled using the second and fourth thread.

The transmitting optical system and the receiving optical system may be formed in the same direction, and the transmitting optical system and the receiving optical system may be the same or may not be the same.

Here, a light source, a first photodetecting element, a light source driving and an automatic output control circuit are formed on the first substrate, and a second photodetecting element and an optical communication receiver circuit are formed on the second substrate to form the first and second substrates. After fixing to the first and second frames, respectively, the first and second frames may be fixed at a predetermined interval on one printed circuit board.

The transceiver of the present invention may also provide a connection with an optical fiber link. That is, a transceiver according to another embodiment of the present invention includes a semiconductor substrate, a first light source formed on the substrate, a first light detecting element formed on the substrate and capable of detecting light emitted from the first light source, and integrated on the substrate. A first light source driving and automatic output control circuit which is connected to the first light source and drives the first light source and receives a signal from the first photodetector to control the output of the first light source, and is integrally formed on the substrate And a first optical communication receiver circuit connected to the first light source driving and automatic output control circuit to provide an input signal to the first light source driving and automatic output control circuit, and a first optical communication receiver circuit connected to the first optical communication receiver circuit. A second photodetection element for providing an input to the second photodetection element, the second photodetection element and the second photodetection element connected to the optical fiber transmission line A first optical fiber adapter, a third photodetector element formed on the substrate, an integrated receiver formed on the substrate and capable of converting and outputting a signal input from the third photodetector element; And a second light source driven by a second light source driving and automatic output control circuit in connection with a second light source driving and automatic output control circuit receiving a signal from a second optical communication receiver circuit, a second light source driving and an automatic output control circuit. A second optical fiber adapter, which is connected to a second light source and connects the second light source to the optical fiber transmission line, is fixed to the substrate and has a plurality of pins for electrical connection to the outside, and is formed to be assembled with the frame And a transmission optical system and a frame for receiving the light from the first light source and transmitting it to an external free space. It is formed to be assembled and comprises a receiving optical system for receiving light from an external free space and transmitting to the third photodetecting device.

Here, each of the second photodetector and the second light source may be formed using a package mounted on a thiocan (TO-can) or directly on the substrate.

In addition, the transceiver of the present invention provides a connection with the Ethernet using a media converter, another embodiment of the transceiver for this, the semiconductor substrate, a light source formed on the substrate, is formed on the substrate and detects light from the light source A first light detecting element capable of being integrated on a substrate, a light source driving and automatic output control circuit and a substrate which are connected to a light source to drive a light source and control the output of the light source by receiving a signal from the first light detecting element. A second photodetector formed on the substrate, an optical communication receiver circuit integrated on the substrate and capable of converting and outputting a signal input from the second photodetector, the substrate being fixed and a plurality of substrates for electrical connection to the outside; The frame has pins, and can be assembled with the frame and come from the light source. A transmission optical system that receives light and transmits it to an external free space, and is formed to be assembled with a frame, and includes a reception optical system that receives light from an external free space and transmits the light to a second light detecting element, It is connected with the light source driving and automatic output control circuit and the optical communication receiver circuit to convert the signal transmitted from the optical communication receiver circuit into the Ethernet signal, and converts the Ethernet signal input from the outside to control the light source driving and automatic output. It includes a media converter circuit that can be delivered to the circuit and has an unshielded twisted-pair (UTP) port for transmitting and receiving Ethernet signals to and from the outside.

On the other hand, the wireless optical communication transponder according to the present invention is a semiconductor substrate, a light source formed on the substrate, a first photodetecting element formed on the substrate and capable of detecting light from the light source, integrally formed on the substrate and a light source A light source driving and automatic output control circuit for driving the light source and receiving a signal from the first photodetector to control the output of the light source, integrated on a substrate, and connected to the light source driving and automatic output control circuit A multiplexer circuit which multiplexes the signal inputted from the light source and outputs it to a light source driving and automatic output control circuit, a second photodetector formed on the substrate, and integrated on the substrate and converting a signal input from the second photodetector Receiver circuit for optical communication that can output, integrated on the board and receiving for optical communication Demultiplexer circuit that is connected to the existing circuit and receives the signal from the optical communication receiver circuit and outputs the demultiplexed signal, and the board is fixed and can be assembled with the frame and the frame having a plurality of pins for electrical connection to the outside. A transmission optical system that is formed and receives light from a light source and transmits it to an external free space, and is assembleable with a frame and receives a light from an external free space and transmits the light to the second photodetecting device. do.

Another wireless optical communication transponder according to the present invention comprises a first semiconductor substrate, a first photodetecting element formed on the first substrate, an integrated formation formed on the first substrate, and converting a signal input from the first photodetecting element An optical communication receiver circuit capable of outputting, an input port integrated on the first substrate and connected to the optical communication receiver circuit for receiving a signal from the optical communication receiver circuit, a drop port for distributing some of the demultiplexed signals, and a reverse A demultiplexer circuit having an output port for outputting the rest of the multiplexed signals; a first frame, a second semiconductor substrate, a second substrate having a fixed first substrate and a plurality of pins for electrical connection to the outside; A light source formed thereon, a second light sword formed on the second substrate and capable of detecting light from the light source; A light source driving and automatic output control circuit integrally formed on the second substrate, the light source driving and automatic output control circuit being connected to the light source to drive the light source and receiving a signal from the second photodetecting device to control the output of the light source; It has an input port for receiving a signal from the output port of the demultiplexer circuit, an add port for receiving a signal to be added from the outside, and an output port for outputting the multiplexed signal to the light source driving and automatic output control circuit. A multiplexer circuit, a second frame having a second substrate fixed thereon and having a plurality of pins for electrical connection to the outside, a printed circuit board having a first frame and a second frame fixed at regular intervals, and a printed circuit board It is formed to be assembleable and transmits the light from the light source and transmits it to the free space outside. Optical system, is formed to enable a printed circuit board and assembled, and includes a receiving optical system for transmission to a second light detecting element for receiving light from the outside of the free space.

Using the transmitter, receiver, and applications thereof of the present invention, it is possible to easily build OWLL and FSON systems, which have many advantages over existing fiber communication systems. In addition, the transmitters, receivers, and applications thereof for the OWLL and FSON of the present invention are small in size, light in weight, and can produce standardized devices at low cost. At the same time, the transmitter, the receiver and the application thereof of the present invention can provide various functions necessary in the wireless optical communication system, and provide these functions to ensure stable reliability.

Claims (33)

Semiconductor substrate, A light source formed on the substrate, A photodetector formed on the substrate and capable of detecting light emitted from the light source; A light source driving and automatic output control circuit integrally formed on the substrate and configured to drive the light source by receiving a signal from an external source, and to control the output of the light source by receiving a signal from the photodetecting device; A frame on which the substrate on which the light source, the light detecting element, the light source driving and the automatic output control circuit are formed is fixed, and having a plurality of pins for electrical connection with the outside; It is formed so as to be assembled with the frame, the wireless optical communication transmitter including an optical system for receiving the light from the light source and transmits to the outside free space. The method of claim 1, The light source is a laser diode or a light emitting diode. The method of claim 1, The optical system is a wireless optical communication transmitter including a lens holder that can adjust the focal length of the lens and the lens. The method of claim 3, wherein And the lens is an aspheric lens or a fresnel lens. The method of claim 1, A first threaded portion integrally formed with the frame or assembleable; Further comprising a second screw unit which is formed integrally or assembling with the optical system, And the frame and the optical system are assembleable using the first and second threads. The method of claim 5, wherein The first and second threaded portions are formed to a certain standard, Wireless optical communication transmitter that can assemble various optical systems with frames of different sizes to the frame. The method of claim 1, Light emitted from the transmitter is eye-safe transmitter for wireless optical communication. A semiconductor substrate having a first side and a second side facing each other, A photodetecting element formed on said first surface of said substrate, An integrated circuit formed on the first surface of the substrate and capable of converting and outputting a signal input from the photodetecting device; A frame on which the substrate on which the photodetecting device and the optical communication receiver circuit are formed is fixed, and having a plurality of pins for electrical connection with the outside; It is formed so as to be assembled with the frame, the wireless optical communication receiver comprising an optical system for receiving the light from the external free space and transmitting to the light detecting element. The method of claim 8, The optical receiver circuit has a terminal for monitoring the magnitude of the input signal from the outside. The method of claim 9, And a display device connected to the terminal through at least one of the plurality of pins of the frame, the display device capable of displaying the magnitude of the input signal to the outside. The method of claim 9, And a receiver for transmitting the magnitude of the input signal to a base station outside the receiver. The method of claim 8, The optical system is a wireless optical communication receiver including a lens holder that can adjust the focal length of the lens and the lens. The method of claim 12, And the lens is an aspheric lens or a fresnel lens. The method of claim 8, A first threaded portion integrally formed with the frame or assembleable; Further comprising a second screw unit which is formed integrally or assembling with the optical system, And the frame and the optical system are assembleable using the first and second threads. The method of claim 14, The first and second threaded portions are formed to a certain standard, Wireless optical receiver that can assemble various optical systems with frames of different size to the frame. The method of claim 8, And the optical system is arranged in line with the optical communication receiver circuit and the light detecting element formed on the substrate. The method of claim 8, The optical system is disposed parallel to the second surface on the second surface side of the substrate, And the frame has an opening that exposes at least a portion of the second surface facing the portion where the light source of the first surface is formed. The method of claim 17, The optical system is a lens formed on the second surface of the substrate, And the opening exposes a portion where the lens is formed. The method of claim 18, The lens is a wireless optical communication receiver formed by etching the semiconductor substrate. The method of claim 18, The lens is a wireless optical communication receiver formed by the coating. Semiconductor substrate, A light source formed on the substrate, A first light detecting element formed on the substrate and capable of detecting light emitted from the light source; A light source driving and automatic output control circuit integrated with the substrate and configured to drive a light source by receiving a signal from the outside and to control a output of the light source by receiving a signal from the first photodetector; A second photodetector formed on the substrate, An integrated circuit formed on the substrate and capable of converting and outputting a signal input from the second photodetecting device; The substrate is fixed, the frame having a plurality of pins for electrical connection to the outside, Is formed so as to be assembled with the frame, the transmission optical system for receiving the light from the light source and transmits to the outside free space, And a receiving optical system formed to be assembled with the frame and receiving light from an external free space and transferring the light to the second photodetecting device. The method of claim 21, A first screw portion which is formed integrally with the frame or is assembleable and is formed adjacent to a portion where the light source of the substrate is formed; A second screw portion which is formed integrally with the frame or is assembleable and is formed adjacent to a portion where the first photodetecting element of the substrate is formed; A third screw portion which is formed integrally or assembling with the transmission optical system, Further comprising a fourth screw unit which is formed integrally or assembling with the receiving optical system, The frame and the transmission optical system may be assembled using the first and third threads, And the frame and the reception optical system are assembleable using the second and fourth screws. The method of claim 21, And said transmitting optical system and said receiving optical system are formed in the same direction. The method of claim 21, The transmission optical system and the reception optical system are the same as the transceiver for the wireless optical communication The method of claim 21, And said transmitting optical system and said receiving optical system are not identical to each other. A first semiconductor substrate, A light source formed on the first substrate, A first photodetecting device formed on the first substrate and capable of detecting light emitted from the light source; A light source driving and automatic output control circuit integrally formed on the first substrate and capable of driving the light source by receiving a signal from the outside and controlling the output of the light source by receiving a signal from the first photodetecting device; A first frame having the first substrate fixed thereto and having a plurality of pins for electrical connection with the outside; Second semiconductor substrate, A second photodetection element formed on the second substrate, An optical communication receiver circuit integrated on the second substrate and capable of converting and outputting a signal input from the second photodetector; A second frame having the second substrate fixed thereto and having a plurality of pins for electrical connection with the outside; A printed circuit board on which the first frame and the second frame are fixed at regular intervals, A transmission optical system which is formed to be assembled with the printed circuit board and receives light from the light source and transmits it to an external free space; And a receiving optical system formed to be assembled with the printed circuit board and receiving light from an external free space and transmitting the light to the second photodetecting device. The method of claim 26, A first screw portion which is formed integrally with the printed circuit board or assembleable and is formed adjacent to a portion where the light source of the first substrate is formed; A second screw portion which is formed integrally with the printed circuit board or is assembleable, and is formed adjacent to a portion where the second photodetecting element of the second substrate is formed; A third screw portion which is formed integrally or assembling with the transmission optical system, Further comprising a fourth screw unit which is formed integrally or assembling with the receiving optical system, The printed circuit board and the transmission optical system may be assembled using the first and third threaded portions, And the printed circuit board and the reception optical system are assembleable using the second and fourth threads. Semiconductor substrate, A first light source formed on the substrate, A first light detecting element formed on the substrate and capable of detecting light emitted from the light source; A first light source driving and automatic integrated on the substrate, the first light source being connected to the first light source to drive the first light source and receiving a signal from the first photodetector to control the output of the first light source Output control circuit, A first optical communication receiver circuit integrally formed on the substrate and connected to the first light source driving and automatic output control circuit to provide an input signal to the first light source driving and automatic output control circuit; A second photodetecting element connected to the first optical communication receiver circuit and providing an input to the first optical communication receiver circuit; A first optical fiber adapter connected to the second photodetector and capable of connecting the second photodetector to an optical fiber transmission line; A third photodetecting element formed on the substrate, A second optical communication receiver circuit integrated with the substrate and capable of converting and outputting a signal input from the third photodetecting device; A second light source driving and automatic output control circuit integrated on the substrate and receiving a signal from the second optical communication receiver circuit; A second light source connected to the second light source driving and automatic output control circuit and driven by the second light source driving and automatic output control circuit, A second optical fiber adapter connected to the second light source and capable of connecting the second light source to an optical fiber transmission line; The substrate is fixed, the frame having a plurality of pins for electrical connection to the outside, A transmission optical system configured to be assembled with the frame and to receive light from the first light source and to transmit it to an external free space; And a receiving optical system that is formed to be assembled with the frame and receives light from an external free space and transmits the light to the third light detecting element. The method of claim 28, And the second photodetector and the second light source are packages mounted in thiocans, respectively. The method of claim 28, And the second photodetector and the second light source are each formed on the substrate. Semiconductor substrate, A light source formed on the substrate, A first light detecting element formed on the substrate and capable of detecting light emitted from the light source; A light source driving and automatic output control circuit integrally formed on the substrate and connected to the light source to drive the light source and receive a signal from the first photodetector to control the output of the light source; A second photodetector formed on the substrate, An integrated circuit formed on the substrate and capable of converting and outputting a signal input from the second photodetecting device; The substrate is fixed, the frame having a plurality of pins for electrical connection to the outside, Is formed so as to be assembled with the frame, the transmission optical system for receiving the light from the light source and transmits to the outside free space, A receiving optical system formed to be assembled with the frame and receiving light from an external free space and transmitting the light to the second photodetecting device; It is integrated on the substrate and connected to the light source driving and automatic output control circuit and the optical communication receiver circuit to convert the signal transmitted from the optical communication receiver circuit into an Ethernet signal, and converts the Ethernet signal input from the outside. Converted and transmitted to the light source driving and automatic output control circuit for wireless optical communication including a media converter circuit having an unshielded twisted-pair (UTP) port for transmitting and receiving Ethernet signals to and from the outside. Transceiver. Semiconductor substrate, A light source formed on the substrate, A first light detecting element formed on the substrate and capable of detecting light emitted from the light source; A light source driving and automatic output control circuit integrally formed on the substrate and connected to the light source to drive the light source and receive a signal from the first photodetector to control the output of the light source; A multiplexer circuit integrated on the substrate, the multiplexer circuit being connected to the light source driving and automatic output control circuits and multiplexing a signal input from the outside to the light source driving and automatic output control circuits; A second photodetector formed on the substrate, An integrated circuit formed on the substrate and capable of converting and outputting a signal input from the second photodetecting device; A demultiplexer circuit integrated on the substrate, the demultiplexer circuit being connected to the optical communication receiver circuit and receiving a signal from the optical communication receiver circuit and outputting a demultiplexed signal; The substrate is fixed, the frame having a plurality of pins for electrical connection to the outside, Is formed so as to be assembled with the frame, the transmission optical system for receiving the light from the light source and transmits to the outside free space, And a receiving optical system configured to be assembled with the frame and to receive light from an external free space and to transmit the light to the second photodetecting device. A first semiconductor substrate, A first photodetecting element formed on the first substrate, An integrated circuit formed on the first substrate and capable of converting and outputting a signal input from the first photodetecting device; An input port integrated on the first substrate, the input port being connected to the optical communication receiver circuit and receiving a signal from the optical communication receiver circuit, a drop port for distributing a part of the demultiplexed signal, and the demultiplexed signal A demultiplexer circuit having an output port for outputting the rest, A first frame having the first substrate fixed thereto and having a plurality of pins for electrical connection with the outside; Second semiconductor substrate, A light source formed on the second substrate, A second photodetecting element formed on the second substrate and capable of detecting light emitted from the light source; A light source driving and automatic output control circuit integrally formed on the second substrate and connected to the light source to drive the light source and receive a signal from the second photodetector to control the output of the light source; An integrated port formed on the second substrate, an input port for receiving a signal from the output port of the demultiplexer circuit, an add port for receiving a signal to be added from the outside, and driving the light source and multiplexing the multiplexed signal A multiplexer circuit having an output port for outputting to a circuit, A second frame having the second substrate fixed thereto and having a plurality of pins for electrical connection with the outside; A printed circuit board on which the first frame and the second frame are fixed at regular intervals, A transmission optical system that is formed to be assembled with the printed circuit board and receives light from the light source and transmits the light to an external free space; And a receiving optical system configured to be assembled with the printed circuit board and to receive light from an external free space and to transmit the light to the second photodetecting device.