KR200435229Y1 - Coarse Wavelength Division Multiplexer Passive Optical Network System having 8 Channle - Google Patents

Abstract

A low density wavelength division multiplexing passive optical communication network device is disclosed. The disclosed apparatus includes a L3 switch having a plurality of SFP modules and ports of the SFP module, a 1310 / 1550nm high isolation WDM on one side connected to the optical path, and a circulator on one side connected to the other side of the 1310 / 1550nm high isolation WDM; It transmits and receives optical signals in multiple wavelength ranges through optical signal transmission and reception long pass WDM and parallel transmission and reception long pass WDM, respectively. An optical fiber having a MUX including a plurality of CWDMs for transmitting / receiving optical signals each connected to the SFP module and eight ports connected to the plurality of CWDMs for transmitting / receiving optical signals, a port of a 1310 nm wavelength band, and a COM port to which an optical path is connected; Line terminal apparatus (OLT); An optical signal transceiver for transmitting and receiving optical signals in a plurality of wavelength regions through an optical path, and seven optical signal transceivers connected in series through the optical path starting from the optical signal transceiver; A plurality of optical network termination devices (ONU) having a plurality of splitters respectively disposed in front of the plurality of optical signal transceivers; And at least one broadband reflective low density wavelength division multiplexing element connected to a front end of one optical fiber termination device directly connected to the optical path among the plurality of optical fiber termination devices.

 Low Density Wavelength Division Multiplexing, Passive Optical Communication Network, WDM, CWDM, PON, AON

Description

Coarse Wavelength Division Multiplexer Passive Optical Network System having 8 Channle

1 is a schematic diagram showing an eight-channel low density wavelength division multiplexing passive optical communication network device according to an embodiment of the present invention;

2 is a view showing the configuration of the OLT side shown in FIG.

3 is a view showing a detailed configuration of the MUX shown in FIG.

4 is a diagram illustrating a configuration of the ONU side shown in FIG. 1.

* Description of Signs for Main Parts in Drawings *

10: OLT 11: L3 switch

13: MUX 15: 1310 / 1550nm High Isolation WDM

17: Circulator 18: Long path WDM for reception

18a to 18h: CWDM for reception 19: Long pass WDM for transmission

19a to 19h: CWDM 21 to 28 for transmission: ONU

21a: Splitter 21b: Optical Signal Transceiver

33: broadband reflective CWDM element 30: optical path

The present invention relates to a passive optical network (Passive Optical Network) device, and more particularly, to a passive optical network device using a Coarse Wavelength Division Multiplexer (Coarse Wavelength Division Multiplexer) method.

Passive Optical Network (PON) technology, a new fiber to the home (FTTH) technology, and Active Optical Network (AON), an existing optical network technology, are all available to subscribers. Based on the optical line, it provides 100Mbps high speed optical communication service to each communication user, and maintains the same level of functionality and speed support.

However, since the AON is connected to the optical line unit (OLT) from the optical network unit (ONU) in a point-to-point manner, the optical paths for each channel must be installed separately, so the cost of installing multiple optical paths is increased. There was a growing problem.

In order to solve the above problems, the present invention is to provide a CWDM-PON device that can accommodate eight channels using a single optical fiber.

In order to achieve the above object, the present invention has a built-in a plurality of small form-factor pluggable (SFP) module, L3 switch having a port of the plurality of SFP module, and 1310 / 1550nm high side that one side is connected to the optical path Isolation WDM (1310 / 1550nm High Isolation Wavelength Division Multiplexer), a circulator on one side connected to the other side of the 1310 / 1550nm high isolation WDM, and a long pass WDM and an optical signal for receiving an optical signal connected in parallel to the circulator Transmitting and receiving optical signals in a plurality of wavelength regions through a long pass WDM for transmission, the long pass WDM for receiving an optical signal, and a long pass WDM for transmitting an optical signal, and are connected to eight SFP modules of the plurality of SFP modules of the L3 switch. Eight optical signal transmission / reception coarse wavelength division multiplexers (CWDMs) and eight ports connected to the eight optical signal transmission / reception CWDMs, a port of a 1310 nm wavelength band, and the optical path are connected. The optical line terminal device (OLT) to the COM port is provided with a MUX; One optical signal transceiver for transmitting and receiving optical signals of multiple wavelength regions through the optical path, and seven optical signal transceivers connected in series through the optical path starting from the optical signal transceiver and the eight optical signal transceivers A plurality of optical network termination devices (ONUs) each having a plurality of splitters disposed in front of the plurality of splitters; And at least one broadband reflective CWDM device connected to a front end of the splitter connected to one optical fiber termination device directly connected to the optical path among the plurality of optical network termination devices. Provides 8 channel low density wavelength division multiplexing passive optical communication network device.

The 1310 / 1550nm high isolation WDM can filter the 1310nm wavelength band and the 1470nm to 1610nm wavelength band with high isolation of 45dB or more.

The optical signal receiving long pass WDM transmits an optical signal in a wavelength range of 1550 nm to 1610 nm among optical signals in a wavelength range of 1470 nm to 1610 nm transmitted through the circulator, and reflects an optical signal in a wavelength range of 1470 nm to 1530 nm. The transmitted optical signal of 1550 to 1610 nm wavelength band transmits and reflects the optical signal through four reception CWDMs to receive optical signals of 1550 nm, 1570 nm, 1590 nm and 1610 nm wavelength bands respectively, and the reflected 1470 nm to 1530 nm respectively. The optical signal in the wavelength band transmits and reflects the optical signal through the remaining four receiving CWDMs to receive optical signals in the wavelength bands of 1470 nm, 1490 nm, 1510 nm, and 1530 nm, respectively, and the long pass WDM for optical signal transmission is 4 1550 nm, 1570 nm, 1590 nm, and 1610 nm wavelengths of optical signals are transmitted through the two CWDMs for transmission, and 4470 CW, 1470 nm, 1 are transmitted and reflected through the CWDM, respectively. Optical signals of the wavelength bands of 490 nm, 1510 nm, and 1530 nm may be reflected to transmit the optical signals of the 1470 nm to 1610 nm wavelength band to the circulator.

The broadband reflection CWDM device has an even wavelength region without noise even in the wavelength bands and 1310 nm wavelength regions of the plurality of transmit / receive CWDMs. It may have a wavelength range.

Hereinafter, a low density wavelength division multiplexing passive optical network device (hereinafter referred to as a CWDM-PON device) according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. same.

1 is a schematic view showing an 8-channel low density wavelength division multiplexing passive optical communication network device according to an embodiment of the present invention, FIG. 2 is a view showing a configuration of an OLT side, and FIG. 3 is a view showing a detailed configuration of a MUX. 4 is a diagram showing the configuration of the ONU side.

8 channel CWDM-PON device according to an embodiment of the present invention, as shown in Figure 1, an optical line terminal device (Optical Line Terminal, hereinafter 'OLT') 10, a plurality of optical network unit (Optical Network Unit, 21 to 28), and a wideband reflect CWDM (33) element.

The OLT 10 includes an L3 switch 11 and a MUX 13. As shown in FIG. 2, the L3 switch 11 includes twelve SFP (Small Form-factor Pluggable) modules, which are optical modules, and twelve first ports 11a to 11l are installed to be connected to the SFP modules. . Of these 12 first ports 11a to 11l, eight first ports 11e to 11l and a plurality of CWDMs 18a to 18h and CWDMs 19a to 19h for transmitting an optical signal will be described below. CWDM port to connect to. The MUX 13 is provided with eight second ports 13a to 13h respectively connected to eight CWDM first ports 11e to 11l among the plurality of 12 first ports 11a to 11l. The third port 13i for transmitting and receiving optical signals in the 1310 nm wavelength region, for example, CATV signals and the like, and the fourth port 13j which is a COM port to which the optical path is connected.

This MUX 13 is a 1310 / 1550nm high isolation WDM (15), circulator 17, long-pass WDM (18; 19) for receiving and transmitting optical signals, optical signals, as shown in FIG. Reception and transmission CWDMs 18a to 18h; 19a to 19h are disposed.

One side of the 1310 / 1550nm high isolation WDM 15 is connected to the third port 13i and the fourth port 13j, and the other side is connected to the circulator 17. The 1310 / 1550nm high isolation WDM 15 may filter the 1310nm band and the 1470-1610nm wavelength band by high isolation (45dB or more).

The circulator 17 is connected to the long path WDM 18 for receiving an optical signal and the long path WDM 19 for transmitting an optical signal.

The long-pass WDM 18 for receiving an optical signal transmits an optical signal having a wavelength of 1550 nm to 1610 nm among optical signals having a wavelength band of 1470 nm to 1610 nm transmitted through the circulator 17, and transmits an optical signal having a wavelength of 1470 nm to 1530 nm. Reflect. In this case, the optical signal of 1550 to 1610 nm wavelength band transmits and reflects the optical signal through four receiving CWDMs 18a to 18d to receive optical signals of 1550 nm, 1570 nm, 1590 nm and 1610 nm wavelength bands, respectively. The optical signal in the wavelength band of 1470 nm to 1530 nm transmits and reflects the optical signal through the remaining four reception CWDMs 18e to 18h to receive optical signals in the wavelength band of 1470 nm, 1490 nm, 1510 nm, and 1530 nm, respectively.

The long-pass WDM 19 for optical signal transmission transmits optical signals in wavelength bands 1550 nm, 1570 nm, 1590 nm, and 1610 nm transmitted through four transmission CWDMs 19a to 19d, respectively, and the remaining four transmission CWDMs 19e. 1470 nm, 1490 nm, 1510 nm, and 1530 nm wavelengths of optical signals transmitted through ˜19h) are reflected to transmit the optical signals of the 1470 nm to 1610 nm wavelength bands to the circulator 17.

On the other hand, the plurality of ONU (21 to 28) transmits and receives an optical signal in the 1310nm wavelength band and 1470nm-1610nm wavelength band with the OLT (10), as shown in Figure 1, point-to-multipoint with the OLT (10) Connected. As shown in Fig. 4, the plurality of ONUs 21 to 28 respectively transmit and receive optical signals transmitted and received by the optical signal transceiver 21b and the optical signal transceiver 21b for receiving optical signals for each wavelength band. Splitter 21a for dividing into is connected to the front end. In this case, one ONU 21 of the plurality of ONUs 21-28 is directly connected to the optical path 30, and starting from the ONU 21, the remaining seven ONUs 22-28 are connected through the multiple optical paths. Are connected in series.

The wideband reflective CWDM element 33 is connected to at least one ONU 21 connected to a single optical line 30 among a plurality of ONUs 21 to 28, and the remaining ONUs 22 to 22 as necessary. 28) It is also possible to connect to the front end of each use. The broadband reflection CWDM element 33 has a uniform wavelength range without noise in each CWDM wavelength band as well as in the 1310 nm wavelength region, unlike a conventional CWDM element having a lot of noise in a wavelength region of 1310 nm or less. It is possible to stably transmit and receive both the optical signal in the 1310 nm wavelength region, which is the CATV signal, and the wavelength region of each CWDM for transmission and reception.

According to the present invention as described above, the 8-channel CWDM-PON device has the advantage of reducing the light path than when using the existing AON (Active Optical Network) device.

Although the present invention has been illustrated and described in connection with a preferred embodiment for illustrating the principles of the present invention, the present invention is not limited to the configuration and operation as shown and described. Rather, those skilled in the art will appreciate that many variations and modifications of the present invention are possible without departing from the spirit and scope of the appended claims. Accordingly, all such suitable changes and modifications and equivalents should be considered to be within the scope of the present invention.

Claims (4)

An L3 switch having a plurality of small form-factor pluggable (SFP) modules and having a port of the plurality of SFP modules, a 1310/1550 nm high isolation wavelength division multiplexer (WDM) having one side connected to an optical path, A circulator having one side connected to the other side of the 1310 / 1550nm high isolation WDM, an optical signal long pass WDM and an optical signal long pass WDM connected in parallel to the circulator, and the optical signal long pass Eight optical signals, each of which transmits and receives the 1310 / 1550nm high isolation WDM and optical signals in a plurality of wavelength regions through WDM and long-pass WDM, and is connected to eight SFP modules among the plurality of SFP modules of the L3 switch. Coarse Wavelength Division Multiplexer (CWDM) for transmission and reception, and eight ports connected to the CWDM for transmission and reception of these eight optical signals, a port of 1310 nm wavelength band, and a COM port to which the optical path is connected. The optical line terminal device (OLT) having a MUX is installed; One optical signal transceiver for transmitting and receiving optical signals of multiple wavelength regions through the optical path, and seven optical signal transceivers connected in series through the optical path starting from the optical signal transceiver and the eight optical signal transceivers A plurality of optical network termination devices (ONUs) each having a plurality of splitters disposed at the front end; And, And at least one broadband reflective CWDM element connected to a front end of the splitter connected to one optical fiber termination device directly connected to the optical path among the plurality of optical fiber termination devices. Low density wavelength division multiplexing passive optical network device. The method of claim 1, The 1310 / 1550nm high isolation WDM is an 8-channel low-density wavelength division multiplexing passive optical network device characterized in that the 1310nm wavelength band and 1470 ~ 1610nm wavelength band to filter the high isolation of 45dB or more. The method of claim 2, The optical signal receiving long pass WDM transmits an optical signal in a wavelength range of 1550 nm to 1610 nm among optical signals in a wavelength range of 1470 nm to 1610 nm transmitted through the circulator, and reflects an optical signal in a wavelength range of 1470 nm to 1530 nm. The transmitted optical signal of 1550 to 1610 nm wavelength band transmits and reflects the optical signal through four receiving CWDMs to receive optical signals of 1550 nm, 1570 nm, 1590 nm and 1610 nm wavelength bands respectively, and the reflected 1470 nm to 1530 nm, respectively. The optical signal in the wavelength band transmits and reflects the optical signal through the remaining four receiving CWDMs to receive optical signals in the 1470 nm, 1490 nm, 1510 nm, and 1530 nm wavelength bands, respectively. The optical signal transmission long pass WDM transmits optical signals of 1550 nm, 1570 nm, 1590 nm, and 1610 nm wavelength bands respectively through four transmission CWDMs, and transmits and reflects the optical signals through the remaining four transmission CWDMs. And an optical signal having a wavelength range of 1470 nm, 1490 nm, 1510 nm, and 1530 nm, respectively, and transmitting the optical signal having a wavelength range of 1470 nm to 1610 nm to the circulator, respectively. The method of claim 1, The broadband reflection CWDM device has an even wavelength region without noise even in the wavelength bands and 1310 nm wavelength ranges of the plurality of CWDMs for transmission and reception.

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