KR20100050024A - A system for transmitting optical signal - Google Patents

A system for transmitting optical signal Download PDF

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Publication number
KR20100050024A
KR20100050024A KR1020080109107A KR20080109107A KR20100050024A KR 20100050024 A KR20100050024 A KR 20100050024A KR 1020080109107 A KR1020080109107 A KR 1020080109107A KR 20080109107 A KR20080109107 A KR 20080109107A KR 20100050024 A KR20100050024 A KR 20100050024A
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South Korea
Prior art keywords
wavelength
optical
cwdm
optical signal
coupler
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KR1020080109107A
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Korean (ko)
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나충남
윤대성
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(주)셀런에스엔
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Publication of KR20100050024A publication Critical patent/KR20100050024A/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/25—Arrangements specific to fibre transmission
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Optical Communication System (AREA)

Abstract

The present invention relates to an optical transmission system for realizing communication between a base station and a plurality of relay periods, and improves transmission efficiency by using a plurality of wavelength converters and edge filters, and installs a relay section. The present invention relates to an optical transmission system having reduced the cost.

Description

Optical transmission system {A System For Transmitting Optical Signal}

The present invention relates to an optical transmission system for realizing communication between a base station and a plurality of relay periods, and improves transmission efficiency by using a plurality of wavelength converters and edge filters, and installs a relay section. The present invention relates to an optical transmission system having reduced the cost.

With the advance of the information industry, the demand for information and communication, which requires convergence with the communication network, is gradually increasing, and the sharing of information from the communication network, the enhancement of information expression, and the exchange of information beyond time and space are required. In order to meet the demand for information and communication, the transmission capacity needs to be expanded. To realize this, a high-speed information communication network capable of broadband transmission of tens to hundreds of Gbps is required, and optical communication using optical fiber is made possible.

In general, optical communication is to transmit data such as voice, text, picture, etc. at high speed by using optical fiber with low transmission loss, and transmits an optical signal, a transmitter that converts and transmits an electrical signal into an optical signal as a transmission medium. A repeater which amplifies in the middle, and a receiver which converts and outputs the received optical signal into an electrical signal.

In addition, there is a wavelength division multiplexing (WDM) method for multiplexing a plurality of wavelengths or data channels using a single optical fiber, which enables multiple optical signal wavelengths to be simultaneously used as a single optical fiber during optical transmission.

4 is a block diagram illustrating a conventional optical transmission system. As shown in FIG. 4, an initial optical transmission network is connected to a base station and a plurality of repeaters by a plurality of optical lines (ie, optical cables). In the base station and the plurality of repeaters, a transmitter and a receiver are connected to a WDM device at one end of the optical path to realize communication, and a separate transmitter and receiver are connected to the WDM device at the other end. It is connected.

However, such a conventional optical transmission system has a problem in that an installation cost for a relay section is increased because a plurality of optical paths must be provided to connect a base station and a plurality of repeaters.

Accordingly, an object of the present invention is to reduce the installation cost of a relay section by providing only one optical path in realizing optical communication between a base station and a plurality of relay periods.

Other objects and advantages of the invention will be described below and will be appreciated by the practice of the invention. Further, objects and advantages of the present invention can be realized by the means and the combination shown in the appended claims.

In an optical transmission system according to an aspect of the present invention, a base station and a plurality of repeaters are optically connected through a single optical path.

At this time, the base station, at least one optical transmitter and optical receiver; At least one wavelength division multiplexer (WDM) connected to the optical transmitter and the optical receiver to pass an optical signal of a specific wavelength and reflect an optical signal of another specific wavelength; At least one wavelength converter for converting a wavelength of an optical signal transmitted from the wavelength division multiplexer into an optical signal having a different wavelength; And a first bundle that bundles the optical signals of various channels having different wavelengths of light and transmits them to the repeater via the optical path, and divides the optical signals of the various channels received from the repeaters according to the wavelengths and distributes them to different optical receivers. A photocovalent linker; The repeater may include an optical transmitter and an optical receiver; A wavelength division multiplexer (WDM) connected to the optical transmitter and the optical receiver to pass an optical signal of a specific wavelength and reflect an optical signal of another specific wavelength; And a wavelength converter for converting a wavelength of the optical signal transmitted from the wavelength division multiplexer into an optical signal of another wavelength; Between the repeater and the optical path, the optical signals of several channels transmitted from a plurality of repeaters are bundled and transmitted to the base station via the optical path, and the optical signals of the various channels received from the base station are divided according to their wavelengths to be different from each other. And a second optical covalent coupler for distributing to the optical receiver of the repeater.

The wavelength converter may further include three low density wavelength division multiplexers (CWDMs) (hereinafter referred to as first to third CWDMs) having different center wavelengths; And three wavelength converting couplers (hereinafter, first to third wavelength converting couplers) for converting light wavelengths by combining a light emitting element and a light receiving element, wherein the first CWDM is connected to the WDM, 3 CWDM is coupled to the first or second covalent coupler, the second CWDM is disposed between the first and third CWDM, the first wavelength conversion coupler is disposed between the WDM and the third CWDM The second and third wavelength converting couplers are disposed between the first and second CWDM.

In addition, the first and second covalent couplers are configured by combining two edge filters having different pass wavelength bands.

In addition, the WDM and the wavelength converter is configured as one unit, characterized in that separated and coupled to the first covalent coupler.

According to the present invention, since it is possible to realize optical communication using only one optical fiber in a plurality of relay periods with the base station, it is possible to drastically reduce the installation cost of the relay section.

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

First, Figure 1 is a block diagram of an optical transmission system according to a preferred embodiment of the present invention.

Referring to FIG. 1, in the optical transmission system according to the present invention, the base station 100 and the relay station 200 are connected through one optical line 300. The relay station 200 includes a plurality of repeaters 220, 230, and 240. The optical path 300 is an optical cable including a large-capacity optical fiber capable of transmitting signals in the wavelength range of 1300 nm to 1600 nm at high speed.

Accordingly, the base station 100 and the plurality of repeaters 220, 230, and 240 may exchange at least one or more optical signals having different wavelengths λ 1 to λ 9 using one optical path 300. As described above, in order for the base station 100 and the plurality of repeaters 220, 230, and 240 to communicate a plurality of optical signals having different wavelengths using the single optical path 300, multiplexing or appropriately distributing optical signals having different wavelengths. There is a need for devices. That is, as shown in FIG. 1, the base station 100 and the plurality of repeaters 220, 230, and 240 each require a wavelength converter 120, 130, 140, 222, 232, 242 and a covalent coupler 110, 210 in addition to the wavelength division multiplexing devices 113 and 213, respectively.

Hereinafter, the configuration of the base station 100 and the relay station 200 constituting the optical transmission system according to the present invention will be described in detail with reference to the drawings.

The base station 100 includes a plurality of transmitters 111 and a receiver 112, a plurality of WDM elements 113, a plurality of wavelength converters 120, 130, 140, and a first covalent combiner 110.

The transmitter 111 is preferably an all-optical conversion device that emits an optical signal of a predetermined wavelength, and a semiconductor laser diode (LD) is preferable, and the receiver 112 is an optical-electric converter that converts an optical signal into an electrical signal. As a conversion element, a photo diode (PD) is preferable. In the case of FIG. 1, the transmitter 111 of the base station 100 emits wavelengths λ 2 and λ 3 , and the receiver 112 receives the wavelength λ 1 .

The wavelength division multiplexer (WDM) 113 is a type of optical coupler that passes an optical signal of a specific wavelength and reflects an optical signal of a specific wavelength. The WDMs 113 and 213 of FIG. 1 pass optical signals of λ 1 (e.g., 1310 nm) wavelengths, and optical signals of λ 2 (e.g., 1550 nm) and λ 3 (e.g., 1510 nm) wavelengths. Is designed to reflect.

In addition, the wavelength converters 120, 130, and 140 are devices for converting an optical signal of a specific wavelength into an optical signal of another wavelength.

Wavelength converter 1 120 of Figure 1 is λ 1 (e.g., 1310nm), λ 2 (e.g., 1550nm), (e.g., 1510nm) λ 3 an optical signal, for λ 1 (for example, each of the , 1310nm), λ 4 (e.g., 1430nm), λ 5 (e. g., converted into an optical signal of 1410nm), wavelength converters 2 (130), for λ 6 (for example, and 1530nm), λ 2 ( For example, 1550 nm), λ 3 (e.g., 1510 nm), respectively, λ 1 (e.g., 1310 nm), λ 2 (e.g., 1550 nm), λ 7 (e.g., 1570 nm), respectively. and the conversion into an optical signal, the wavelength converter 3 140 λ 8 (e.g., 1470nm), λ 2 (e.g., 1550nm), λ 3 (e.g., 1510nm) λ 1 to the optical signal of each (E.g., 1310 nm), λ 9 (e.g., 1490 nm), and λ 3 (e.g., 1510 nm).

2 shows an internal block diagram of the wavelength converter 1 120. 2, wavelength converter 1 120 includes three CWDMs (Coarse Wavelength Multiplexers) 121, 122, and 123 and three wavelength converting couplers 124, 125, and 126.

The CWDMs 121, 122, and 123 are optical elements that pass optical signals within a predetermined bandwidth (± 7 nm) from a center wavelength λ 0 and reflect all other optical signals.

The center wavelength λ 0 of CWDM 1 121 in FIG. 2 is λ 3 (eg, 1510 nm), and the center wavelength λ 0 of CWDM 2 122 is λ 5 (eg, 1410 nm). , The center wavelength λ 0 of CWDM 3 123 is λ 1 (eg, 1310 nm).

The wavelength conversion coupler 124, 125, 126 is a device that transmits a signal to the medium by combining the light emitting device LD and the light receiving device PD, and converts the wavelength of the optical signal.

The wavelength converting coupler 124 of FIG. 2 converts λ 1 (e.g., 1310 nm) to λ 1 (e.g., 1310 nm) and the wavelength converting coupler 125 converts λ 3 (e.g., 1510nm) to λ 5 (e.g., 1410 nm), and wavelength converting coupler 126 converts λ 2 (eg, 1550 nm) to λ 4 (eg, 1430 nm).

In addition, the CWDM 1 121 and the wavelength conversion coupler 124 are connected to the wavelength division multiplexer (WDM) 113, and the CWDM 3 123 is connected to the first covalent coupler 110.

The wavelength converter 2 (130) and the wavelength converter 3 (140) is composed of three CWDM and three wavelength conversion coupler, the configuration and principle of the wavelength converter 1 (120) is exactly the same. However, the wavelength converter 1 (120), the wavelength converter 2 (130) and the wavelength converter 3 (140) only differ in the wavelength of the optical signal to be processed.

That is, the center wavelength λ 0 of CWDM 1 (CWDM connected to the WDM) of the wavelength converter 2 130 is λ 3 (for example, 1510 nm), and the center wavelength λ 0 of the CWDM 2 is λ 7 ( For example, 1570 nm), and the central wavelength λ 0 of CWDM 3 (CWDM that is connected to the first covalent bond) is λ 6 (eg, 1530 nm). Accordingly, wavelength converting coupler 124 of wavelength converter 2 130 (coupler coupled with WDM) converts λ 6 (e.g., 1530 nm) to λ 1 (e.g., 1310 nm), and wavelength converting coupler 125 is λ. 3 (eg, 1510 nm) is converted to λ 7 (eg, 1570 nm) and wavelength converting coupler 126 converts λ 2 (eg, 1550 nm) to λ 2 (eg, 1550 nm).

Further, the center wavelength λ 0 of CWDM 1 (CWDM connected to the WDM) of the wavelength converter 3 140 is λ 3 (for example, 1510 nm), and the center wavelength λ 0 of the CWDM 2 is λ 9 ( For example, 1490 nm, and the center wavelength λ 0 of CWDM 3 (CWDM that is connected to the first covalent bond) is λ 8 (eg, 1470 nm). Thus, wavelength converting coupler 124 of wavelength converter 3 140 (coupler coupled with WDM) converts λ 8 (e.g., 1470nm) to λ 1 (e.g., 1310nm), and wavelength converting coupler 125 is λ. 2 (eg 1550 nm) is converted to λ 9 (eg 1490 nm) and wavelength converting coupler 126 converts λ 3 (eg 1510 nm) to λ 3 (eg 1510 nm).

In addition, the first covalent coupler 110 bundles optical signals of various channels having different wavelengths of light and transmits them to the relay station 200 via a single optical path 300 and receives the received signals from the relay station 200. The optical signal of the channel is divided according to its wavelength and distributed to different receivers 112.

3 shows an internal block diagram of the first covalent coupler 110. Referring to FIG. 3, the first covalent coupler 110 is composed of a combination of two edge filters 114 and 115.

The edge filters 114 and 115 pass optical signals of a specific wavelength band and reflect optical signals of a specific wavelength band.

That is, the edge filter 1 114 of FIG. 3 passes an optical signal in a wavelength band of 1450 nm to 1620 nm and reflects an optical signal in a wavelength band of 1270 nm to 1430 nm. On the other hand, the edge filter 2 115 passes the optical signal in the wavelength band of 1530 nm to 1620 nm, and reflects the optical signal in the wavelength band of 1260 nm to 1510 nm.

The edge filter 1 114 of the first covalent coupler 110 is connected to the CWDM 3 123, the optical path 300, and the edge filter 2 115 of the wavelength converter 1 120, and the first covalent coupler 110. Edge Filter 2 115 is connected to the Edge Filter 1 114, the CWDM 3 123 of the wavelength converter 2 130, and the CWDM 3 123 of the wavelength converter 3 140.

On the other hand, the relay station 200 of FIG. 1 is connected to the base station 100 through a single optical path 300, the second covalent combiner 210, repeater # 1 (220), repeater # 2 (230) and Repeater # 3 (240).

The repeater # 1 220, the repeater # 2 230, and the repeater # 3 240 are respectively a transmitter 211, a receiver 212, a wavelength division multiplexer (WDM) 213, and a wavelength converter 4. , 5, 6 (222, 223, 224).

The wavelength converter 4 (222), the wavelength converter 5 (223) and the wavelength converter 6 (224) is composed of three CWDM and three wavelength conversion coupler in that it converts an optical signal of a specific wavelength into an optical signal of another wavelength The wavelength converter 1 120, the wavelength converter 2 130, and the wavelength converter 3 140 on the side of the base station 100 are exactly the same in structure and principle.

However, the wavelength converter 4 222 (e.g., 1310nm), λ 1, λ 4 (e.g., 1430nm), λ 5 (e.g., 1410nm), respectively for λ 1 (for example, the optical signal , 1310 nm), λ 2 (e.g., 1550 nm), λ 3 (e.g., 1510 nm), and the wavelength converter 5 (232) is λ 1 (e.g., 1310 nm), λ 2 (E.g., 1550 nm), λ 7 (e.g., 1570 nm), respectively, λ 6 (e.g., 1530 nm), λ 2 (e.g., 1550 nm), and λ 3 (e.g., 1510 nm), respectively. Wavelength converter 6 (242) converts λ 1 (e.g., 1310 nm), λ 9 (e.g., 1490 nm), and λ 3 (e.g., 1510 nm), respectively. It converts into optical signals of λ 8 (e.g., 1470 nm), λ 2 (e.g., 1550 nm), and λ 3 (e.g., 1510 nm) (see FIG. 1).

That is, the center wavelength λ 0 of CWDM 1 (CWDM connected to the WDM) of the wavelength converter 4 222 is λ 3 (eg, 1510 nm), and the center wavelength λ 0 of the CWDM 2 is λ 5 ( For example, 1410 nm), and the central wavelength λ 0 of CWDM 3 (CWDM, which is connected to a covalent bond) is λ 4 (eg, 1430 nm). Accordingly, wavelength converting coupler 124 of wavelength converter 4 222 (coupler coupled with WDM) converts λ 1 (e.g., 1310nm) to λ 1 (e.g., 1310nm) and wavelength converting coupler 125 is λ. 5 (eg, 1410 nm) is converted to λ 3 (eg, 1510 nm) and wavelength converting coupler 126 converts λ 4 (eg, 1430 nm) to λ 2 (eg, 1550 nm).

The wavelength λ 0 of CWDM 1 (CWDM connected to the WDM) of the wavelength converter 5 232 is λ 3 (for example, 1510 nm), and the center wavelength λ 0 of CWDM 2 is λ 7 (for example, For example, 1570 nm), and the center wavelength λ 0 of CWDM 3 (CWDM, which is connected to a covalent bond) is λ 6 (eg, 1530 nm). Accordingly, wavelength converting coupler 124 of wavelength converter 5 222 (coupler coupled with WDM) converts λ 6 (e.g., 1530 nm) to λ 1 (e.g., 1310 nm), and wavelength converting coupler 125 is λ. 7 (eg, 1570 nm) is converted to λ 3 (eg, 1510 nm) and the wavelength conversion coupler 126 converts λ 2 (eg, 1550 nm) to λ 2 (eg, 1550 nm).

The wavelength λ 0 of CWDM 1 (CWDM connected to the WDM) of the wavelength converter 6 242 is λ 3 (eg, 1510 nm), and the center wavelength λ 0 of CWDM 2 is λ 9 (eg, For example, 1490 nm), and the center wavelength λ 0 of CWDM 3 (CWDM connected with a covalent bond) is λ 8 (eg, 1470 nm). Accordingly, wavelength converting coupler 124 of wavelength converter 6 242 (coupler coupled with WDM) converts λ 8 (e.g., 1470nm) to λ 1 (e.g., 1310nm), and wavelength converting coupler 125 is λ. 9 (e.g., 1490nm) (e.g., 1550nm) λ 2, and converted to, is converted into the wavelength conversion coupler 126 is λ 3 (e.g., 1510nm) to λ 3 (e.g., 1510nm).

In addition, the second covalent coupler 210 is similar to the first covalent coupler 110 of FIG. 3. The Edge Filter 1 (pass wavelength band: 1450 nm to 1620 nm, reflection wavelength band: 1270 nm to 1430 nm) and the Edge Filter 2 ( Pass wavelength band: 1530nm ~ 1620nm, reflection wavelength band: 1260nm ~ 1510nm).

The Edge Filter 1 114 of the second covalent coupler 210 is connected to the CWDM 3, the optical path 300 and the Edge Filter 2 115 of the wavelength converter 4 222, and the Edge of the second covalent coupler 210. Filter 2 115 is coupled to CWDM 3 of Edge Filter 1 114, Wavelength Converter 5 232, and CWDM 3 of Wavelength Converter 6 242.

Hereinafter, a process of communication between a base station and a plurality of repeaters using a single optical fiber by using the optical transmission system having the above-described configuration will be described. Here, only the communication between the base station 100 and the repeater # 1 220 is described for convenience of description, but the base station 100 and the remaining repeater # 2 and the repeater # 3 are also communicated in the same procedure.

First, optical signals of λ 2 (for example, 1550 nm) and λ 3 (for example, 1510 nm) emitted from the transmitter 111 of the base station 100 are bypassed by the wavelength division multiplexer (WDM) 113. To CWDM 1 121 of wavelength converter 1 120. The CWDM 1 121 transmits the optical signal of λ 3 (for example, 1510 nm) to the wavelength conversion coupler 125 and reflects the optical signal of λ 2 (for example, 1550 nm) to the wavelength conversion coupler 126. do. Wavelength conversion coupler 125 is λ 3 (e.g., 1510nm) the optical signal (e.g., 1410nm) λ 5 is converted into optical signals and transmitted to the CWDM 2 (122), the wavelength conversion coupler 126 is λ 2 ( For example, an optical signal of 1550 nm is converted into an optical signal of λ 4 (eg, 1430 nm) and transmitted to the CWDM 2 122.

CWDM 2 122 transmits an optical signal having a wavelength λ 5 (e.g., 1410 nm) from wavelength converting coupler 125 to CWDM 3 123, and transmits a wavelength λ 4 (e.g., from wavelength converting coupler 126). , 1430nm) and reflects the optical signal to the CWDM 3 (123).

CWDM 3 123 is an optical signal of wavelength λ 5 (eg, 1410 nm) passing through CWDM 2 122 and an optical signal of wavelength λ 4 (eg, 1430 nm) reflected by CWDM 2 122. Reflects all of them and delivers them to the edge filter 1 114 of the first covalent coupler 110.

The edge filter 1 114 reflects both the optical signal having the wavelength λ 5 (eg, 1410 nm) and the optical signal having the wavelength λ 4 (eg, 1430 nm) and passes through the optical path 300 to transmit the relay station 200. ) To the second covalent combiner 210.

The edge filter 1 114 of the second covalent coupler 210 also reflects the optical signal having the wavelength λ 5 (eg, 1410 nm) and the optical signal having the wavelength λ 4 (eg, 1430 nm) to repeater # 1. To CWDM 3 123 of wavelength converter 4 222 of 220.

The CWDM 3 123 reflects the optical signal having the wavelength λ 5 (eg, 1410 nm) and the optical signal having the wavelength λ 4 (eg, 1430 nm) to the CWDM 2 122, and the CWDM 2 122 is An optical signal having a wavelength of λ 5 (eg, 1410 nm) is passed to the wavelength conversion coupler 125, and an optical signal having a wavelength of λ 4 (eg, 1430 nm) is reflected to the wavelength conversion coupler 126.

The wavelength conversion coupler 125 converts an optical signal having a wavelength λ 4 (eg, 1430 nm) into an optical signal having a wavelength λ 3 (eg, 1510 nm), and the wavelength conversion coupler 126 has a wavelength λ 5 (eg, 1410 nm). ) Is converted into an optical signal having a wavelength λ 2 (for example, 1550 nm) and transmitted to a wavelength division multiplexer (WDM) 213. The wavelength division multiplexer (WDM) 213 bypasses the λ 3 (eg, 1510 nm) and λ 2 (eg, 1550 nm) optical signals and passes them to the receiver 212. Accordingly, the optical signal transmitted from the transmitter 111 of the base station 100 is transmitted to the receiver 212 of the repeater # 1 220 via the single optical path 300.

On the other hand, the optical signal of wavelength λ 1 (eg, 1310 nm) transmitted from the transmitter 211 of the repeater # 1 220 passes through the WDM 213 to pass the wavelength conversion coupler 124 and the CWDM of the wavelength converter 4 222. After passing through 3, it is introduced into the edge filter 1 of the second covalent coupler 210.

Edge filter 1 of the second covalent coupler 210 reflects the optical signal having the wavelength λ 1 (eg, 1310 nm) to the optical path 300, and transmits the wavelength λ 1 via the optical path 300. The optical signal (eg, 1310 nm) is transmitted to the edge filter 1 114 of the first covalent coupler 110.

Edge filter 1 (114) of the first covalent coupler 110 reflects the optical signal of the wavelength λ 1 (for example, 1310nm) and transmits to the CWDM 3 (123) of the wavelength converter 1 (120), CWDM 3 Reference numeral 123 transmits the optical signal having the wavelength λ 1 (for example, 1310 nm) to the receiver 112 through the wavelength conversion coupler 124 and the WDM 113.

In the above described with reference to the accompanying drawings, preferred embodiments of the present invention in detail. However, embodiments of the present invention can be variously modified or applied by those skilled in the art, the scope of the technical idea according to the present invention should be determined by the claims to be described later will be.

The following drawings, which are attached to this specification, illustrate exemplary embodiments of the present invention, and together with the detailed description of the present invention, serve to further understand the technical spirit of the present invention. It should not be construed as limited to.

1 is a block diagram of an optical transmission system according to the present invention.

2 is an internal block diagram of the wavelength converter of FIG.

3 is an internal block diagram of the covalent coupler of FIG.

4 is a block diagram of a conventional optical transmission system.

Claims (5)

In an optical transmission system in which a base station and a plurality of repeaters are optically connected through a single optical path, The base station comprises: At least one optical transmitter and optical receiver; At least one wavelength division multiplexer (WDM) connected to the optical transmitter and the optical receiver to pass an optical signal of a specific wavelength and reflect an optical signal of another specific wavelength; At least one wavelength converter for converting a wavelength of an optical signal transmitted from the wavelength division multiplexer into an optical signal having a different wavelength; A first optical beam which bundles optical signals of various channels having different wavelengths of light and transmits them to the repeater via the optical path, and divides the optical signals of the various channels received from the repeaters according to the wavelengths and distributes them to different optical receivers Comprises a covalent bond; The repeater, Optical transmitter and optical receiver; A wavelength division multiplexer (WDM) connected to the optical transmitter and the optical receiver to pass an optical signal of a specific wavelength and reflect an optical signal of another specific wavelength; And A wavelength converter for converting a wavelength of the optical signal transmitted from the wavelength division multiplexer into an optical signal of another wavelength; Between the repeater and the optical path, the optical signals of several channels transmitted from a plurality of repeaters are bundled and transmitted to the base station via the optical path, and the optical signals of the various channels received from the base station are divided according to their wavelengths to be different from each other. And a second optical covalent coupler for distributing to the optical receiver of the repeater. The method of claim 1, The wavelength converter, Three low density wavelength division multiplexers (CWDMs) (hereinafter referred to as first to third CWDMs) having different center wavelengths; And three wavelength converting couplers (hereinafter, first to third wavelength converting couplers) for converting the wavelength of light by combining the light emitting element and the light receiving element. The method of claim 2, The first CWDM is connected to the WDM, The third CWDM is connected to the first or second covalent bond, The second CWDM is disposed between the first and third CWDM, The first wavelength conversion coupler is disposed between the WDM and the third CWDM, And the second and third wavelength converting coupler are disposed between the first and second CWDM. The method according to any one of claims 1 to 3, The first and second covalent bond groups, An optical transmission system comprising two edge filters having different pass wavelength bands in combination. The method of claim 4, wherein The WDM and the wavelength converter are composed of a single unit, the optical transmission system, characterized in that separated from the first covalent coupler.
KR1020080109107A 2008-11-04 2008-11-04 A system for transmitting optical signal KR20100050024A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
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WO2013048119A1 (en) * 2011-09-26 2013-04-04 주식회사 에치에프알 Method for sharing optical fiber for cloud-based wired and wireless access network, and system and apparatus for same
US9258548B2 (en) 2010-12-27 2016-02-09 Samsung Electronics Co., Ltd. Apparatus and method for generating depth image

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9258548B2 (en) 2010-12-27 2016-02-09 Samsung Electronics Co., Ltd. Apparatus and method for generating depth image
WO2013048119A1 (en) * 2011-09-26 2013-04-04 주식회사 에치에프알 Method for sharing optical fiber for cloud-based wired and wireless access network, and system and apparatus for same
KR101477169B1 (en) * 2011-09-26 2014-12-29 주식회사 에치에프알 Method for Sharing Optical Fiber for Cloud Based Network, System And Apparatus Therefor
US9596048B2 (en) 2011-09-26 2017-03-14 Sk Telecom Co., Ltd. Method for sharing optical fiber for cloud-based wired and wireless access network, and system and apparatus for same

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