KR20130042260A - Optic signal transmission system in cloud network, multiplexer for optic signal transmission - Google Patents

Optic signal transmission system in cloud network, multiplexer for optic signal transmission Download PDF

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Publication number
KR20130042260A
KR20130042260A KR1020110106444A KR20110106444A KR20130042260A KR 20130042260 A KR20130042260 A KR 20130042260A KR 1020110106444 A KR1020110106444 A KR 1020110106444A KR 20110106444 A KR20110106444 A KR 20110106444A KR 20130042260 A KR20130042260 A KR 20130042260A
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KR
South Korea
Prior art keywords
optical signal
wavelength
multiplexing
optical
multiplexing device
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Application number
KR1020110106444A
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Korean (ko)
Inventor
최오열
채웅식
김경준
신성호
Original Assignee
에스케이텔레콤 주식회사
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Priority to KR1020110106444A priority Critical patent/KR20130042260A/en
Publication of KR20130042260A publication Critical patent/KR20130042260A/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
    • H04B10/2575—Radio-over-fibre, e.g. radio frequency signal modulated onto an optical carrier
    • H04B10/25752—Optical arrangements for wireless networks
    • H04B10/25753—Distribution optical network, e.g. between a base station and a plurality of remote units
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • 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
    • H04B10/27—Arrangements for networking
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0003—Details

Abstract

Conventionally, when installing a plurality of telecommunication devices in the same place, it is not possible to carry a plurality of signals of the same optical wavelength (1350nm) used in the individual telecommunication devices in one optical core, so as to transmit There is no choice but to transmit a signal by configuring an optical cable for each communication device. In this case, as many optical cores are needed as the number of telecommunication devices, additional costs may be incurred in constructing the optical core infrastructure. Thus, in the embodiment of the present invention, by using one optical core to transmit the optical signal of the same wavelength to a plurality of telecommunication devices, the optical signal transmission technology in a cloud network that can reduce the investment cost for the optical core infrastructure I would like to propose.

Description

OPTIC SIGNAL TRANSMISSION SYSTEM IN CLOUD NETWORK, MULTIPLEXER FOR OPTIC SIGNAL TRANSMISSION}

BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to optical signal transmission technology, and in particular, to enable optical networks to transmit optical signals for multiple telecommunication devices via a single optical core in a cloud network, thereby reducing the optical core investment cost. A signal transmission system and a multiplexing device for optical signal transmission.

In general, a base station may be composed of a digital unit (DU) that processes baseband and a communication unit (RU; RF unit) that processes analog radio signals such as RF.

The digital device and the communication device may be configured as one device or may be configured by separating the digital device and the communication device by a certain distance. A communication device separated from and controlled by a digital device may be referred to as a remote radio frequency unit (RRU), and a plurality of telecommunication devices may be connected to one digital device through an optical cable.

1 illustrates a connection configuration between such a digital device and a telecommunication device.

As shown in FIG. 1, the digital device 10 may be connected to the telecommunication device 14/1 to 14 / N through a plurality of optical cables 12/1 to 12 / N. ) May transmit an optical signal to a telecommunication device 14/1 to 14 / N using a certain wavelength, for example, a wavelength of 1350 nm.

In this case, when a plurality of telecommunication devices are installed in the same place, since a plurality of signals having the same optical wavelength (1350 nm) used by individual telecommunication devices cannot be loaded on one optical core and transmitted in FIG. As shown in the figure, optical cables 12/1 to 12 / N may be configured to transmit signals for each individual telecommunication device 14/1 to 14 / N.

In this case, as many optical cores are needed as the number of telecommunication devices, additional costs may be incurred in constructing the optical core infrastructure.

Korean Patent Publication No. 2009-0132956, Passive Optical Subscriber Network System and Its Optical Signal Receiving Method, 2009.12.31. open Korean Laid-Open Patent No. 2008-0068990, Communication device and method between a digital device and a remote RF device in a base station of a broadband wireless communication system, 2008.07.25. open

Thus, in the embodiment of the present invention, by using one optical core to transmit the optical signal of the same wavelength to a plurality of telecommunication devices, the optical signal transmission technology in a cloud network that can reduce the investment cost for the optical core infrastructure I would like to propose.

An optical signal transmission system according to an embodiment of the present invention is a digital device for receiving an optical signal of the same wavelength from a plurality of client terminals, and converts each of the optical signal of the wavelength pre-assigned to the received optical signal ( Digital unit), a first multiplexing device that merges optical signals of different wavelengths input from the digital device and multiplexes into one optical signal, and demultiplexes the optical signal from the first multiplexing device through a single optical cable And a second multiplexing device that separates each into an optical signal having a predetermined wavelength, and each telecommunication device receiving each optical signal provided from the second multiplexing device.

Here, the digital device and the respective telecommunication device may be applied with a common public radio interface (CPRI) or an Open Base Station Architecture Initiative (OBSAI) transmission protocol.

In addition, the first multiplexing device and the second multiplexing device may use a coarse wavelength division multiplexing (CWDM) technique or a sense wavelength length multiplexing (DWDM) technique.

An optical signal transmission system according to an embodiment of the present invention comprises a digital device for receiving an optical signal of the same wavelength from a plurality of client terminals, and an optical signal of a predetermined wavelength for the optical signal provided from the digital device. A first multiplexing device for converting and merging the converted optical signals into a single optical signal, and demultiplexing the optical signal from the first multiplexing device provided through a single optical cable, A second multiplexing device for splitting an optical signal and converting the wavelength into the same wavelength for each wavelength-separated optical signal; and a respective telecommunication device for receiving each wavelength-converted optical signal through the second multiplexing device. It may include.

The multiplexing apparatus for optical signal transmission according to an embodiment of the present invention, each receiving a plurality of optical signals having the same wavelength from each other provided from the digital device, and converts the received optical signal into an optical signal of a pre-assigned wavelength Each wavelength converter may include a multiplexing unit for merging optical signals of different wavelengths wavelength-converted through the respective wavelength converters and multiplexing them into one optical signal.

Here, the multiplexing apparatus may be applied with a CWDM technique or a DWDM technique.

In addition, the multiplexing device may be a fast multiplexing method.

In addition, the fast multiplexing method may be characterized by multiplexing n signals having a predetermined transmission rate at the same time.

The multiplexing apparatus for optical signal transmission according to an embodiment of the present invention, the demultiplexing unit for demultiplexing the multiplexed optical signal provided through a single optical cable into an optical signal having a predetermined wavelength, and the demultiplexing Each optical signal provided from the unit may include a wavelength conversion unit for converting the optical signal of the same wavelength and provided to each telecommunication device.

Here, the multiplexing apparatus may be applied with a CWDM technique or a DWDM technique.

In addition, the multiplexing apparatus may be a fast demultiplexing scheme.

In addition, the fast demultiplexing scheme may be characterized by simultaneously demultiplexing n signals having a predetermined transmission rate.

According to the present invention, by transmitting the optical signal of the same wavelength to a plurality of telecommunication devices through a single optical core, it is possible to reduce the initial installation cost due to the expansion of the optical core infrastructure. In addition, even when operating a plurality of telecommunication devices can be managed using only one optical cable can increase the operational stability in the cloud network environment.

1 is a diagram illustrating a connection between a conventional digital device and a telecommunication device;
2 is a block diagram illustrating an optical signal transmission system in a cloud network according to an embodiment of the present invention;
3 is a detailed block diagram of a digital device having a wavelength conversion function in the optical signal transmission system of FIG.
4 is a block diagram illustrating an optical signal transmission system in a cloud network according to another embodiment of the present invention;
FIG. 5 is a block diagram illustrating an optical signal transmission system in a cloud network capable of fast multiplexing and fast demultiplexing according to another embodiment of the present invention; FIG.
6 is a detailed block diagram of a multiplexing device having a wavelength conversion and multiplexing function in the optical signal transmission system of FIG.
7 is a detailed block diagram of a multiplexing device having demultiplexing and wavelength conversion functions in the optical signal transmission system of FIG.

Advantages and features of the present invention, and methods of achieving the same will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, it is to be understood that the present invention is not limited to the disclosed embodiments, but may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. It is intended that the disclosure of the present invention be limited only by the terms of the appended claims. Like numbers refer to like elements throughout.

In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. In addition, terms to be described below are terms defined in consideration of functions in an embodiment of the present invention, which may vary according to intention or custom of a user or an operator. Therefore, the definition should be based on the contents throughout this specification.

Prior to the description of the embodiment, the present invention converts an optical signal of the same wavelength to be used in each telecommunication device in a digital unit or a multiplexer to different optical wavelengths, thereby allowing a plurality of remotes through a single optical core. By transmitting an optical signal of the same wavelength to the communication device, it is possible to easily achieve the object of the present invention from this technical idea.

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

2 is a block diagram illustrating an optical signal transmission system in a cloud network according to an embodiment of the present invention. The digital device 100, the first multiplexing device 104, the second multiplexing device 108, and telecommunications are illustrated in FIG. Devices 112/1 to 112 / N, and the like.

In the embodiment of FIG. 2, the digital device allocates different optical wavelengths for each telecommunication device, and the multiplexing device includes a passive multiplexing device for transmitting the optical wavelengths for each of these telecommunication devices through one optical cable. Can be applied.

As illustrated in FIG. 2, the digital apparatus 100 converts a plurality of optical signals having the same wavelength into different wavelengths, and converts the first multiplexing apparatus through the respective optical cables 102/1 to 102 / N. 104) can serve as a role.

In detail, the digital apparatus 100 may serve to receive optical signals having the same wavelength from a plurality of client terminals (not shown), and convert the received optical signals into optical signals having a predetermined wavelength for the received optical signals. .

As shown in FIG. 3, the digital device 100 uses a predetermined wavelength (eg, 850 nm) for each optical signal of the same wavelength (for example, 850 nm) provided through the optical cables 102/1 to 102 / N. For example, each wavelength conversion unit 100/1 to 100 / N converting the wavelength to 1270 nm, 1290 nm, and 1610 nm may be included.

In this case, techniques such as low density CWDM (Coarse Wavelength Division Multiplexing) or high density DWDM (Dense Wavelength Division Multiplexing) may be applied to convert the wavelength of the optical signal.

Referring back to FIG. 2, the first multiplexing device 104 may serve to merge optical signals of different wavelengths input from the digital device 100 and multiplex into one optical signal. The multiplexed optical signal may be transmitted to the second multiplexing device 108 through the optical cable 106.

The second multiplexing device 108 demultiplexes the multiplexed optical signal inputted through the optical cable 106, and separates each of the second multiplexed device into an optical signal having a predetermined wavelength (for example, 1270 nm, 1290 nm ,, and 1610 nm). It may serve to deliver to each telecommunication device (112/1 ~ 112 / N).

The telecommunication devices 112/1 to 112 / N are means for receiving respective optical signals provided from the second multiplexing device 108, and each telecommunication device 112/1 to 112 / N is shown in FIG. Although illustrated separately from each other, it will be readily apparent to those skilled in the art that each of the telecommunication devices 112/1 to 112 / N may be located adjacent to each other at a short distance.

As the optical signal transmission protocol between the digital device 100 and the telecommunication device 112/1 to 112 / N, for example, a common public radio interface (CPRI) or an open base station architecture initiative (OBSAI) may be used. It can be applied regardless of the transmission speed.

4 is a block diagram illustrating an optical signal transmission system in a cloud network according to another embodiment of the present invention. The digital device 200, the first multiplexing device 204, the second multiplexing device 208, and telecommunications are illustrated in FIG. Devices 212/1 to 212 / N, and the like.

In the embodiment of Fig. 4, the multiplexing device receives a plurality of optical signals having the same wavelength from the digital device, and the multiplexing device uses the same wavelength to transmit the plurality of optical signals having the same wavelength through one optical cable. Wavelength conversion and multiplexing to different wavelengths may be applied.

In this case, in order to convert the wavelength of the optical signal, not only a low density CWDM technique but also a high density DWDM technique may be applied.

As shown in FIG. 4, the digital device 200 provides a plurality of optical signals having the same wavelength to each other through the respective optical cables 102/1 to 102 / N to the first multiplexing device 204. can do.

The first multiplexing device 204 receives a plurality of optical signals having the same wavelength from each other provided from the digital device 200, converts the received optical signals into optical signals of a predetermined wavelength, and converts each of the optical signals. It may serve to merge optical signals of different wavelengths and multiplex into one optical signal.

In this case, as illustrated in FIG. 5, the first multiplexing device 204 multiplexes the speed per optical wavelength between the digital device 200 and the telecommunication devices 212/1 to 212 / N at high speed to one optical signal. A high speed multiplexing scheme carried on the wavelength can be applied. For example, assuming that the transmission rate per optical wavelength between the digital device 200 and the telecommunication devices 212/1 to 212 / N is 2.5 Gbps, the high-speed multiplexing method generates n such 2.5 Gbps signals. For example, high-speed multiplexing at a speed that can accommodate four, that is, 10Gbps.

FIG. 6 is a diagram illustrating the above-described first multiplexing device 204 in detail, and may include a plurality of wavelength converters 204/1 to 204 / N, a multiplexing unit 204a, and the like.

As shown in Fig. 6, the wavelength converters 204/1 to 204 / N are optical signals of the same wavelengths (for example, 850 nm) provided through the optical cables 202/1 to 202 / N. It may serve to convert the wavelength into a pre-assigned wavelength (for example, 1270nm, 1290nm ,,, 1610nm), respectively.

The multiplexer 204a merges the optical signals of different wavelengths, which are wavelength-converted through the wavelength converters 202/1 to 202 / N, into multiplexes into one optical signal, and then second multiplexes through the optical cable 206. It may serve to deliver to the device 208.

Referring back to FIG. 4, the second multiplexing device 208 demultiplexes the optical signal from the first multiplexing device 204 provided through the optical cable 206 to provide a pre-assigned wavelength (eg, 1270 nm, 1290 nm ,, 1610 nm), and converts the wavelength into the first input wavelength (850 nm) for each wavelength separated optical signal and then to each telecommunication device (212/1 to 212 / N). It can play a role.

At this time, as shown in FIG. 5, the second multiplexing device 208 demultiplexes the speed per optical wavelength between the digital device 200 and the telecommunication devices 212/1 to 212 / N at high speed, respectively. A high speed demultiplexing scheme carried on the telecommunication devices 212/1 to 212 / N may be applied. Assuming that the typical optical wavelength per wavelength between the digital device 200 and the telecommunication devices 212/1 to 212 / N is 2.5 Gbps, the high speed demultiplexing method is the same as the high speed multiplexing method described above. It will be capable of high speed demultiplexing at a speed that can accommodate four signals, that is, 10Gbps.

FIG. 7 is a diagram illustrating the above-described second multiplexing device 208 in detail, and may include a demultiplexing unit 208a, a plurality of wavelength converters 208/1 to 208 / N, and the like.

As shown in FIG. 7, the demultiplexing unit 208a demultiplexes an optical signal from the first multiplexing device 204 provided through the optical cable 206 to generate a predetermined wavelength (for example, 1270 nm, 1290 nm ,,, 1610 nm) may be separated into an optical signal.

The wavelength converters 204/1 to 204 / N convert the respective optical signals provided from the demultiplexer 208a into wavelengths 850 nm input for the first time and then each telecommunication device 212/1 to 212. / N). For example, the first wavelength converter 208/1 converts an optical signal having a wavelength of 2170 nm provided from the demultiplexer 208a into a wavelength of 850 nm to the first telecommunication device 212/1. I can deliver it.

As the optical signal transmission protocol between the digital device 100 and the telecommunication device 112/1 to 112 / N, for example, a common public radio interface (CPRI) or an open base station architecture initiative (OBSAI) may be used. It can be applied regardless of the transmission speed.

As described above, the embodiment of the present invention converts an optical signal of the same wavelength to be used in each telecommunication device in a digital device or a multiplexing device to a different optical wavelength, thereby providing a single optical core in a cloud network environment. It is implemented to transmit optical signals for a number of telecommunication devices.

According to an embodiment of the present invention, by transmitting an optical signal of the same wavelength to a plurality of telecommunication devices through a single optical core, it is possible to reduce the initial installation cost due to the expansion of the optical core infrastructure, even if the telecommunication devices are operated a large number Since it can be managed with only one optical cable, it can increase operational stability in cloud network environment. Therefore, in the present invention, when constructing a long term evolution (LTE) network, it is expected that the network operation stability of a Smart Cloud Access Network (SCAN) environment can be increased to activate the next generation network market.

100, 200: digital device 104, 108, 204, 208: multiplexing device
106, 206: Optical cable 112/1 to 112 / N, 212/1 to 212 / N: Telecommunication device
100/1 to 100 / N, 204/1 to 204 / N: wavelength conversion unit
204a: multiplexer 208a: demultiplexer

Claims (10)

A digital unit for receiving an optical signal having the same wavelength from a plurality of client terminals, and converting the optical signal to a respective optical signal of a wavelength allocated to the received optical signal;
A first multiplexing device for merging optical signals of different wavelengths inputted from the digital device and multiplexing them into one optical signal;
A second multiplexing device for demultiplexing the optical signal from the first multiplexing device through a single optical cable and separating each of the optical signals into optical signals having a predetermined wavelength;
Each telecommunication device receiving each optical signal provided from said second multiplexing device;
Optical signal transmission system. The method of claim 1,
The digital device and each telecommunication device may be applied with a common public radio interface (CPRI) or an Open Base Station Architecture Initiative (OBSAI) transmission protocol.
Optical signal transmission system. The method of claim 1,
The first multiplexing device and the second multiplexing device may include a coarse wavelength division multiplexing (CWDM) technique or a sense wavelength length multiplexing (DWDM) technique.
Optical signal transmission system. A digital device each receiving an optical signal of the same wavelength from a plurality of client terminals;
A first multiplexing device converting the optical signal provided from the digital device into an optical signal having a predetermined wavelength, and merging the converted optical signal into a single optical signal;
A second demultiplexing of the optical signal from the first multiplexing device provided through a single optical cable, separating the optical signal into an optical signal of a pre-assigned wavelength, and converting the wavelength into the same wavelength for each wavelength separated optical signal With a multiplexing device,
Each telecommunication device receiving each wavelength signal converted by the second multiplexing device;
Optical signal transmission system. A wavelength converting unit for receiving a plurality of optical signals having the same wavelength from each other provided from the digital device, and converting the plurality of optical signals into optical signals having a predetermined wavelength with respect to the received optical signals;
And a multiplexing unit for merging optical signals of different wavelengths converted by the respective wavelength converters and multiplexing them into one optical signal.
Multiplexing device for optical signal transmission. The method of claim 5, wherein
The multiplexing device, CWDM technique or DWDM technique is applied
Multiplexing device for optical signal transmission. The method of claim 5, wherein
In the multiplexing apparatus, a fast multiplexing scheme for simultaneously multiplexing n signals having a predetermined transmission rate is applied.
Multiplexing device for optical signal transmission. A demultiplexer for demultiplexing the multiplexed optical signal provided through a single optical cable and separating the multiplexed optical signal into an optical signal having a predetermined wavelength;
A wavelength converting unit converting each optical signal provided from the demultiplexing unit into an optical signal having the same wavelength and providing each optical communication unit to each telecommunication device;
Multiplexing device for optical signal transmission. The method of claim 8,
The multiplexing device, CWDM technique or DWDM technique is applied
Multiplexing device for optical signal transmission. The method of claim 8,
The multiplexing apparatus may include a fast demultiplexing scheme for simultaneously demultiplexing n signals having a predetermined transmission rate.
Multiplexing device for optical signal transmission.
KR1020110106444A 2011-10-18 2011-10-18 Optic signal transmission system in cloud network, multiplexer for optic signal transmission KR20130042260A (en)

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