KR20070020926A - Method and system of sharing passive optical core using optical circulator - Google Patents

Abstract

The present invention relates to an optical core sharing method and system using an optical circulator.

In a first network repeater and a second network repeater system for transmitting and receiving an optical signal using a plurality of wavelengths according to the present invention, when one wavelength is the same, an optical core is used between an donor unit and a remote unit using an optical circulator. The sharing method includes the step of inputting the same wavelength to the circulator of the donor part through the second network port of the donor part; Inputting the same wavelength to a common port of the donor part in the circulator of the donor part; Inputting the same wavelength to a common port of the remote unit through an optical line at a common port of the donor unit; Inputting the same wavelength to a circulator of the remote unit at a common port of the remote unit; And outputting, by the circulator of the remote unit, the same wavelength through the second communication network port of the remote unit.

Optical, circulator, core, shared

Description

Passive optical core sharing method and system using optical circulator {METHOD AND SYSTEM OF SHARING PASSIVE OPTICAL CORE USING OPTICAL CIRCULATOR}

1 is a schematic configuration diagram of a donor unit on which an optical line sharing module according to an embodiment of the present invention is mounted.

2 is a shape view of a donor self according to another embodiment of the present invention.

3 is a system configuration diagram when one wavelength among three wavelengths using the optical circulator according to another embodiment of the present invention is the same.

4 illustrates a detailed signal flow of the system according to the embodiment of FIG.

5A to 5C are diagrams illustrating the configuration and operation of an optical circulator according to still another embodiment of the present invention.

The present invention relates to an optical repeater, and more particularly, to operate a CDMA optical repeater system and a WCDMA optical repeater system using one optical core. The present invention relates to a method and a system for transmitting the same two wavelengths without distortion when it is necessary to use a repeater.

In general, a mobile phone operator operates an optical repeater that can expand service at a low cost instead of additionally installing a base station to expand coverage.

The optical repeater passes through an optical core to receive a radio frequency (RF) signal from a base station located at a remote location. The optical core converts the RF signal of the base station into light and provides the optical repeater at a remote location. It performs the function of transmitting the incoming RF signal from the base station located in the far.

Conventionally, in applying the optical core sharing module of a plurality of optical filtering methods (using Wavelength Division Multiplexing (WDM)) to share the optical cores of the CDMA optical repeater and the WCDMA optical repeater, some systems are not applicable to the wavelength specification and thus cannot be applied. Multiple localizations occurred. Therefore, there is a further need for an apparatus that allows the application of such inapplicable wavelength CDMA optical repeater systems.

That is, the conventional CDMA optical repeater uses two wavelengths of 1310 ± 10nm and 1550 ± 10nm, but some equipments use 15 wavelengths by adding 1510 ± 10nm wavelength to realize reverse diversity. If WCDMA optical repeaters with wavelengths of 1510 ± 10nm, 1530 ± 10nm, and 1570 ± 10nm of these systems and optical modules are attempted to share the optical lines by using the sharing module, problems arise with the same wavelength of 1510 ± 10nm.

Accordingly, the present invention has been made to solve the problems of the prior art, and when the core cannot be shared by the optical core sharing module of the conventional filtering method, that is, the wavelength used locally at the same time operating the CDMA optical repeater and WCDMA optical repeater If these three wavelengths and one of them is the same (for example, 1510nm), to provide a method and system that can transmit the same wavelength in both directions without interference with each other using a circulator in the existing optical core sharing module There is this.

In a first network repeater and a second network repeater system for transmitting and receiving an optical signal using a plurality of wavelengths according to the present invention, when one wavelength is the same, an optical core is used between an donor unit and a remote unit using an optical circulator. The sharing method includes the step of inputting the same wavelength to the circulator of the donor part through the second network port of the donor part; Inputting the same wavelength to a common port of the donor part in the circulator of the donor part; Inputting the same wavelength to a common port of the remote unit through an optical line at a common port of the donor unit; Inputting the same wavelength to a circulator of the remote unit at a common port of the remote unit; And outputting, by the circulator of the remote unit, the same wavelength through the second communication network port of the remote unit.

In a first network repeater and a second network repeater system for transmitting and receiving an optical signal using a plurality of wavelengths according to the present invention, when one wavelength is the same, an optical core is used between an donor unit and a remote unit using an optical circulator. The sharing method includes the step of inputting the same wavelength to the circulator of the remote unit through a first communication network port of the remote unit; Inputting the same wavelength to a common port of the remote unit in a circulator of the remote unit; Inputting the same wavelength to a common port of the donor portion through an optical line at a common port of the remote portion; Inputting the same wavelength to a circulator of the donor part at a common port of the donor part; And outputting the same wavelength through the donor unit's first communication network port in the donor unit's circulator.

In a first network repeater and a second network repeater system for transmitting and receiving an optical signal using a plurality of wavelengths according to the present invention, when one wavelength is the same, an optical core is used between an donor unit and a remote unit using an optical circulator. The sharing system receives the same wavelength from the second communication network port of the donor section and outputs the same wavelength to the common port of the donor section, and receives the same wavelength from the common port of the donor section and outputs the same wavelength to the first network port of the donor section. A donor unit including a radar; And a circulator that receives the same wavelength from the first communication network port of the remote unit and outputs the same wavelength to the common port of the remote unit, and receives the same wavelength from the common port of the remote unit and outputs the same wavelength to the second communication network port of the remote unit. A remote unit; And an optical path connecting the common port of the donor part and the common port of the remote part.

Details and improvements of the invention are disclosed in the dependent claims.

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

1 is a schematic configuration diagram of a donor unit on which an optical line sharing module according to an embodiment of the present invention is mounted.

Referring to FIG. 1, the donor unit includes an optical core sharing module, and the optical core sharing module includes an input port 2G, a 3G repeater input port 3G, and a sharing port COM of a 2G repeater. Include. In addition, although not shown in the drawing, the donor part includes a laser diode (LD), a photo diode (PD), and a wavelength division multiplexer.

Laser diode (LD) is a block containing a chip that generates a unique wavelength, receives a high frequency (RF) signal received from the base station to convert into an optical signal and converts the unique wavelength to the converted optical signal, respectively It is loaded differently and provided to a wavelength division multiplexer.

The photodiode PD converts an optical signal having a unique wavelength provided through a wavelength division multiplexer into a high frequency (RF) signal and provides the same to a base station.

The donor may be implemented with a 19 "1U self, which is the same as the donor self of the existing core sharing module. In addition, up to four optical core sharing modules may be mounted in the self.

2 is a shape view of a donor self according to another embodiment of the present invention.

Referring to FIG. 2, a schematic shape of the donor self of FIG. 1 is shown. That is, the front view, the left and right side views, the rear view and the internal view of the donor part are shown. As shown in the inside view, a shape in which four optical core sharing modules are mounted is shown. The sharing module is mounted inside the remote enclosure of the 3G optical repeater using its fixing holes and brackets.

3 is a system configuration diagram when one wavelength among three wavelengths using the optical circulator according to another embodiment of the present invention is the same.

Referring to FIG. 3, in the system, the optical core sharing module includes a donor part and a remote part.

The donor section allows the shared module to be mounted in the shelf and the remote is designed to be mounted inside the repeater.

The passive optical core sharing system using the optical circulator includes a donor part, a remote, and an optical line.

4 illustrates a detailed signal flow of the system according to the embodiment of FIG.

Referring to FIG. 4, first, an optical core sharing method will be described when transmitting an optical signal from a donor unit to a remote unit.

The 3G signal is input to the low spacing wavelength division multiplexer at a wavelength of 1510 nm at the 3G port, which is input to the circulator. The wavelength input to the circulator does not go to the 2G port due to the characteristics of the circulator, and is output to the common port through the wavelength division multiplexer. Subsequently, the remote unit passes through the wavelength division multiplexer to the remote unit's circulator, where it does not go back to the 2G port but through the wavelength division multiplexer to the 3G port. Meanwhile, the 2G signal is loaded on a 1310 nm wavelength and transmitted from the donor part to the remote part.

Next, an optical core sharing method will be described when transmitting an optical signal from the remote unit to the donor unit.

The 2G signal is carried on the wavelengths of 1510nm and 1530nm, and the wavelength emitted from the 2G port of the remote part is transmitted to the circulator by splitting the 1510nm wavelength in the wavelength division multiplexer. Is sent through. Subsequently, the 1510nm wavelength input to the circulator of the donor portion does not go back to the 3G port but is transmitted to the 2G port. Meanwhile, as shown in the drawing, 3G signals are transmitted on wavelengths of 1530 nm and 1570 nm.

By the above-described method, the same wavelength (1510 nm in the above embodiment) can be transmitted in different directions without interference with each other.

The CWDM (Coarse Wavelength Division Multiplexing) shown in the figure is a technique of grouping (multiplexing) optical signals with a fairly wide wavelength interval (e.g., 10 nm or more, 20 nm interval according to the International Telecommunications Recommendations). to be. Or an optical element having such a function. The wavelength division multiple passive optical network (WDM), which is one of the optical subscriber network technologies that can transmit and receive large amounts of information to each subscriber by using the optical device fabrication technology and the low-wavelength wavelength multiplexing technology using the reliable dielectric thin film filter -PON) is a realistic way to implement.

In addition, the CWDM is a component that distributes or combines the intensity or wavelength of an optical signal into several, and is mainly used for optical signal distribution, wavelength distribution of optical signals such as an optical repeater module, an optical network, and EDFA.

A circulator according to a preferred embodiment of the present invention performs a function of separating and demultiplexing bidirectional signals or merging remultiplexed bidirectional signals. The circulator is an irreversible passive device consisting of three or more ports. For example, when composed of three ports, the light component having a circulation structure such that the light input to the first port is output only to the second port and the light input to the second port is output only to the third port. Such a circulator is applied to an optical fiber amplifier or bidirectional communication applied to a wavelength division multiplexing system. The internal structure of the general circulator and the optical path will be described with reference to FIGS. 5A to 5C.

5A to 5C are diagrams illustrating the configuration and operation of an optical circulator according to still another embodiment of the present invention.

5A to 5C are conceptual views illustrating the internal structure and the optical path of the circulator used in the present invention. More specifically, FIG. 5A is an internal configuration diagram of the circulator, and FIG. 5B is a second view from the first port. The optical path proceeding to the port is shown, and FIG. 5C illustrates the optical path traveling from the second port to the third port.

Referring to FIG. 5A, the circulator includes a beam displacer, a rotor, and a collimator.

The circulator is an irreversible device, and the position of the output port is changed according to the light propagation direction, and the light passing through the irreversible crystal feels a different path difference depending on the propagation direction. This is the output from the port. In addition, in order to eliminate the polarization dependence, the light of the two polarization states are basically divided and given different paths and combined again (in the same manner as the configuration of the isolator). Here, the functional description of each component will be omitted, and the description will be given based on the optical path.

First, an optical path traveling from the first port to the second port will be described with reference to FIG. 5B. Light incident from the first port is separated through the beam displacer, combined again at the displacer through the rotor and the displacer and the rotor and output to the second port.

Next, an optical path traveling from the second port to the third port will be described with reference to FIG. 5C. The optical path from the second port to the third port runs in the opposite direction to the path shown in FIG. 5B. However, since the rotor is an irreversible rotor, even if the light incident in the reverse direction is rotated by the rotor, it is compensated by the other rotor and is output to the beam displacer without being changed in the polarization state and output to the third port.

Although described above based on the preferred embodiment of the present invention, those skilled in the art will understand that it can be carried out in other specific forms without changing the technical spirit or essential features of the technical field to which the present invention belongs. Therefore, the embodiments described above are to be understood as illustrative in all respects and not as restrictive. The scope of the present invention is defined by the appended claims rather than the foregoing description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention. do.

By using the passive optical core sharing method and system according to the present invention, when the wavelength of use of the optical fiber sharing module of the conventional filtering method is not applicable to three wavelengths and one of the same wavelengths is included, signals in both directions are not interfered with each other. By sharing the optical core by sharing the transmission cost can be minimized.

Claims (19)

In a first network repeater and a second network repeater system for transmitting and receiving optical signals using multiple wavelengths, a method of sharing an optical core using an optical circulator between a donor unit and a remote unit when one wavelength is the same. , (a) inputting the same wavelength to the circulator of the donor part through the second network port of the donor part; (b) inputting the same wavelength to a common port of the donor part in the donor circulator; (c) inputting the same wavelength at a common port of the donor portion to a common port of the remote portion through an optical line; (d) inputting the same wavelength to the circulator of the remote unit at a common port of the remote unit; And and (e) outputting the same wavelength at the circulator of the remote unit through a second communication network port of the remote unit. In a first network repeater and a second network repeater system for transmitting and receiving optical signals using multiple wavelengths, a method of sharing an optical core using an optical circulator between a donor unit and a remote unit when one wavelength is the same. , (a) inputting the same wavelength to the circulator of the remote unit through a first communication network port of the remote unit; (b) inputting the same wavelength to a common port of the remote unit in a circulator of the remote unit; (c) inputting the same wavelength to a common port of the donor portion through an optical line at a common port of the remote portion; (d) inputting the same wavelength to the donor part's circulator at the common port of the donor part; And and (e) outputting the same wavelength through the donor part's first communication network port in the donor part's circulator. The method of claim 1, wherein step (a) comprises: (a1) inputting the same wavelength to the first wavelength division multiplexer of the donor portion at the second communication network port of the donor portion; And and (a2) inputting the same wavelength to the circulator of the donor unit in the first wavelength division multiplexer of the donor unit. The method of claim 2, wherein step (a) comprises: (a1) inputting the same wavelength to a first wavelength division multiplexer of the remote unit at a first communication network port of the remote unit; And and (a2) inputting the same wavelength to the circulator of the remote unit in the first wavelength division multiplexer of the remote unit. According to claim 1, wherein step (b), (b1) inputting the same wavelength to the second wavelength division multiplexer of the donor part in the donor circulator; And and (b2) inputting the same wavelength to a common port of the donor unit in the second wavelength division multiplexer of the donor unit. The method of claim 2, wherein step (b) comprises: (b1) inputting, by the circulator of the remote unit, the same wavelength to a second wavelength division multiplexer of the remote unit; And and (b2) inputting the same wavelength to a common port of the remote unit in the second wavelength division multiplexer of the remote unit. The method of claim 1, wherein step (d) (d1) inputting the same wavelength to a second wavelength division multiplexer of the remote unit at a common port of the remote unit; And and (d2) inputting the same wavelength to the circulator of the remote unit in the second wavelength division multiplexer of the remote unit. The method of claim 2, wherein step (d) (d1) inputting the same wavelength to a second wavelength division multiplexer of the donor part at a common port of the donor part; And and (d2) inputting the same wavelength to the donor part's circulator in the second wavelength division multiplexer of the donor part. The method of claim 1, wherein step (e) (e1) inputting, by the circulator of the remote unit, the same wavelength to a third wavelength division multiplexer of the remote unit; And (e2) further comprising the step of outputting the same wavelength through the second communication network port of the remote unit in the third wavelength division multiplexer of the remote unit. The method of claim 2, wherein step (e) (e1) inputting the same wavelength to a third wavelength division multiplexer of the donor part in the donor circulator; And and (e2) outputting the same wavelength through the second communication network port of the remote unit in the third wavelength division multiplexer of the donor unit. The method according to claim 1 or 2, The first communication network is a 2G system including a CDMA network, the second communication network is an optical core sharing method using an optical circulator, characterized in that the 3G system including a WCDMA network. The method of claim 11, The plurality of wavelengths include 1310nm, 1510nm and 1550nm in the case of 2G system, and 1510nm, 1530nm and 1570nm in the case of 3G system. The method of claim 12, The same wavelength is 1510nm, the optical core sharing method using an optical circulator, characterized in that. A first network repeater and a second network repeater system for transmitting and receiving optical signals using a plurality of wavelengths, wherein when one wavelength is the same, an optical circulator is used to share an optical core between a donor part and a remote part. , And a circulator for receiving the same wavelength from the second communication network port of the donor part and outputting the same wavelength to the common port of the donor part, and receiving the same wavelength from the common port of the donor part and outputting the same wavelength to the first communication network port of the donor part. Donor part; And a circulator that receives the same wavelength from the first communication network port of the remote unit and outputs the same wavelength to the common port of the remote unit, and receives the same wavelength from the common port of the remote unit and outputs the same wavelength to the second communication network port of the remote unit. A remote unit; And An optical core sharing system using an optical circulator comprising an optical line connecting the common port of the donor unit and the common port of the remote unit. The method of claim 14, The donor unit and the remote unit each include at least one wavelength division multiplexer for splitting / combining a plurality of wavelengths, the optical core sharing system using an optical circulator The method of claim 15, wherein the wavelength division multiplexer, An optical core sharing system using an optical circulator, characterized by a low spacing wavelength division multiplexer (CWDM). The method according to claim 14 or 15, The first communication network is a 2G system including a CDMA network, the second communication network is an optical core sharing system using an optical circulator, characterized in that the 3G system including a WCDMA network. The method of claim 17, wherein the plurality of wavelengths, The plurality of wavelengths include 1310 nm, 1510 nm, and 1550 nm in a 2G system, and 1510 nm, 1530 nm, and 1570 nm in a 3G system. The method of claim 18, The same wavelength is 1510nm, the optical core sharing system using the optical circulator, characterized in that.

Images