KR100704397B1 - 16 channels MUX/DeMUX for Coarse Wavelength Division Multiplexing - Google Patents

Abstract

The present invention relates to a 16 channel mux / demux for low density wavelength division multiplexing with low insertion loss. 16 channel mux / demux according to the present invention, the first three wavelength region separator which transmits the optical signal of the first wavelength region and the optical signal of the second wavelength region and the third wavelength region of the transmitted optical signal And a first extractor unit comprising a plurality of light insertion extractors for selectively transmitting or reflecting the optical signal of the first wavelength region according to the wavelength, and the optical signal of the second wavelength region reflected by the first three wavelength region separator. A second extractor unit comprising a plurality of light insertion extractors selectively transmitting or half-reflecting according to the first wavelength region and the first wavelength region and the second wavelength region included in the optical signal of the third wavelength region reflected by the first three wavelength region separator. A second wavelength region separator that reflects the optical signal, transmits the optical signal of the fourth wavelength region, and reflects the optical signal of the fifth wavelength region, and an optical signal of the fourth wavelength region that has passed through the second three wavelength region separator According to your optional A third extractor unit comprising a plurality of light insert extractors for transmitting or reflecting, and a plurality of light insert extractors for selectively transmitting or reflecting an optical signal of a fifth wavelength region reflected by the second three wavelength region separator according to a wavelength It includes a fourth extractor unit.

MUX / Demux, MUX / DeMUX, Triple Wavelength Separator, Optical Insertion Extractor, Insertion Loss

Description

16 channels MUX / DeMUX for Coarse Wavelength Division Multiplexing}

1 is a schematic diagram showing the configuration of optical communication for transmitting and receiving optical signals according to the prior art,

2 is a view schematically showing an example of the configuration of a mux / demux of 16 channels for low density wavelength division multiplexing according to the prior art;

3 is a view schematically showing another example of a configuration of a mux / demux of 16 channels for low density wavelength division multiplexing according to the prior art;

4 is a schematic view showing a first embodiment of the configuration of a mux / demux of 16 channels for low density wavelength division multiplexing according to the present invention;

FIG. 5 schematically illustrates an example of a three-wavelength region separator used for the mux / demux of the 16 channels for the low density wavelength division multiplexing of FIG. 4; FIG.

FIG. 6 schematically shows a second embodiment of the configuration of a mux / demux of 16 channels for low density wavelength division multiplexing according to the present invention.

* Explanation of symbols for main parts of drawings *

100; Main connector 110,120,130; Three wavelength zone separator

112a, 122a, 132a; Input optical paths 114,115,124,125,134,135; filter

117a, 127a, 137a; Output optical paths 141 to 156; Photo Insert Extractor

A1 to A4, B1 to B4, C1 to C4, D1 to D4; Connector, channel

The present invention relates to a low density wavelength division multiplexing optical communication, and more particularly to a low density wavelength division multiplexing mux / demux.

In today's advanced information society, the demand for high-speed Internet, high-capacity data services, and multimedia communications is exploding. Therefore, in order to realize such a high-speed information and communication network, continuous research is being conducted in order to increase national competitiveness as well as major enterprises and research institutes. In order to implement such a high speed information communication network, an ultra high speed optical communication network based on optical communication using light has been developed. An example of such a high speed optical communication network is FTTH (Fiber-To-The-Home).

As a core technology for achieving such FTTH, a bidirectional transmission / reception module is in the spotlight, and a time division multiplexing method or a wavelength division multiplexing method is used.

The wavelength division multiplexing method is a multiplexing method using multiple communication channels with one transmission line. That is, the wavelength division multiplexing method transmits signals having different wavelengths through one transmission line, and the receiving side separates the transmitted signals into signals according to respective wavelengths. Such wavelength division multiplexing is largely divided into dense wavelength division multiplexing and coarse wavelength division multiplexing.

Currently, low density wavelength division multiplexing is used based on the 20nm proposed by the ITU. The low-density wavelength division multiplexing system uses an uncooled DFB laser and a wideband optical filter because of its large wavelength spacing. These technologies have the advantages of low power consumption, small size and low cost. The system for low-density wavelength division multiplexing that provides these advantages can multiplex and transmit individual 16 optical signals on a single optical cable in a wavelength division multiplexing scheme. In general, the low density wavelength division multiplexing method uses 16 of 18 channels from 1270 nm to 1610 nm by using the wavelength gap of the optical fiber.

Despite the total 18 channels of ITU standard, 16 channels are used to avoid the loss of single mode fiber (SMF-28). That is, it is common to use 16 channels except 1390nm and one of the adjacent 1370 or 1410 due to the loss due to the water peak present at about 1390nm.

Optical communication using a low density wavelength division multiplexing method is composed of an MUX / DeMUX (MUX / DeMUX) and an optical cable connecting it as shown in FIG. At this time, when it is necessary to transmit or receive an optical signal between the mux and the demux, an OADM (Optical Add / Drop Multiplexer) is installed.

An example of the structure of the 16-channel mux / demux for the low density wavelength division multiplexing is shown in FIG. 2.

Referring to FIG. 2, the 16-channel mux / demux for low-density wavelength division multiplexing divides the main connector 1 connected to the optical cable (see FIG. 1) and the optical signal introduced into the optical cable into two groups according to the wavelength range. And a first light insertion extractor 10 and 16 light insertion extractors 21 to 36 for separating the optical signal separated by the first light insertion extractor 10 into respective wavelengths. In addition, the connectors a1 to a11 and b1 to b5 are connected to the sixteen optical insertion extractors 21 to 36, respectively. At this time, the connection of the optical signal line of the main connector 1 and the first daylight insertion extractor 10, the connection of the light signal line of the first daylight insertion extractor 10 and the light insertion extractor 21, 16 light insertion extractors 21 36 to 36, and 16 optical insertion extractors 21 to 36 and connectors a1 to a11 and b1 to b5 are fusion-spliced. This fusion splicing point is indicated by c in FIG. 2.

The first main light insertion extractor 10 includes a filter that reflects an optical signal introduced into an optical cable from 1,270 nm to 1,350 nm and transmits from 1,410 nm to 1,610 nm. In addition, the optical signal transmitted through the first main light insertion extractor 10 is separated by the optical insertion extractors 21 to 31 at intervals of 1,410 nm and 20 nm, respectively. For example, the optical insertion extractor 21 that separates only an optical signal having a wavelength of 1,410 nm has a filter that transmits an optical signal having a wavelength of 1,410 nm and reflects an optical signal having other wavelengths. In addition, the optical signals reflected from the first chief insertion extractor 10 are separated by 5 nm optical extractors 32 to 36 at intervals of 20 nm from 1,270 nm, respectively. Therefore, the 16 channel mux / demux having the above structure can transmit 16 optical signals through one optical cable.

By the way. Insertion loss occurs when the optical signal is transmitted or reflected through the optical insertion extractors 10, 21 to 36. Typically, an insertion loss of about 0.6 dB occurs when an optical signal passes through the optical insertion extractors 10, 21 to 36, and an insertion of about 0.3 dB when reflected by the optical insertion extractors 10, 21 to 36. Loss occurs. In the case where the optical signal lines are connected by fusion, an insertion loss of approximately 0.03 dB occurs for each fusion splicing point c. Calculation of the insertion loss of each 16 channel mux / demux having the above structure for each channel is shown in Table 1 below. In this case, an insertion loss of approximately 0.2 dB is also observed in the main connectors 1 connecting the optical cable and the 16 channel mux / demux and the connectors a1 to a11 and b1 to b5 respectively connected to the 16 optical insertion extractors 21 to 36. Occurs but is not included in the calculation.

channel Reflection Permeation Recovery Fusion splicing score Insertion Loss by Channel a1 0 2 3 1.29 a2 One 2 4 1.62 a3 2 2 5 1.95 a4 3 2 6 2.28 a5 4 2 7 2.61 a6 5 2 8 2.94 a7 6 2 9 3.27 a8 7 2 10 3.6 a9 8 2 11 3.93 a10 9 2 12 4.26 a11 10 2 13 4.59 b1 0 One 3 0.99 b2 One One 4 1.32 b3 2 One 5 1.65 b4 3 One 6 1.98 b5 4 One 7 2.31

Here, the loss per channel is calculated as follows. For example, the optical signal coming out of the a1 channel (first connector in FIG. 2) passes through the first daylight extraction extractor 10, passes through the light insertion extractor 21, and passes through three fusion splicing points c. Done. Therefore, the insertion loss of the a1 channel is calculated as 0.3 x 0 + 0.6 x 2 + 0.03 x 3 = 1.29, and the insertion loss of the a2 channel is calculated as 0.3 x 1 + 0.6 x 2 + 0.03 x 4 = 1.62. The insertion loss of the following a3 to b5 channels can be calculated by the same method as described above. The maximum insertion loss of the 16 channel mux / demux is generated in the a11 channel (the eleventh connector of FIG. 2) and is 4.59 dB.

3 shows another embodiment of a 16-channel mux / demux for low density wavelength division multiplexing according to the prior art.

The 16-channel mux / demux of FIG. 3 has the same components as the above-described 16-channel mux / demux, but the optical signal in the wavelength region of 1270 nm to 1450 nm is transmitted through the second daylight extractor 10 ', Other optical signals differ only in the point of reflection. Therefore, the optical signal transmitted through the second daylight insertion extractor 10 'is separated by 20 nm intervals by eight light insertion extractors 21' through 38 ', and the light reflected by the second daylight insertion extractor 10' is reflected. The signal is separated at 20 nm intervals by eight photoinsertable extractors 29'-36 '.

The insertion loss of the 16 channel mux / demux according to another embodiment is shown in Table 2.

channel Reflection Permeation Recovery Fusion splicing score Insertion Loss by Channel a1 0 2 3 1.29 a2 One 2 4 1.62 a3 2 2 5 1.95 a4 3 2 6 2.28 a5 4 2 7 2.61 a6 5 2 8 2.94 a7 6 2 9 3.27 a8 7 2 10 3.6 b1 0 One 3 0.99 b2 One One 4 1.32 b3 2 One 5 1.65 b4 3 One 6 1.98 b5 4 One 7 2.31 b6 5 One 8 2.64 b7 6 One 9 2.97 b8 7 One 10 3.3

Here, since the method for calculating the insertion loss for each channel is the same as described above, a detailed description thereof will be omitted. Therefore, the insertion loss of the 16 channel mux / demux according to another embodiment is 3.6 dB at maximum in the a'8 channel (the eighth connector of FIG. 3).

As such, the 16-channel mux / demux has a problem in that the maximum insertion loss is considerably large because the optical signals inputted through one optical cable are separated by wavelength by connecting many optical insertion extractors.

The present invention has been made in view of the above problems, and an object thereof is to provide a 16-channel mux / demux for low-density wavelength division multiplexing having a maximum insertion loss less than that of the related art.

An object of the present invention as described above, the main optical path for transmitting an optical signal; A first three wavelength region separator for transmitting an optical signal of a first wavelength region among the optical signals transmitted to the optical path and reflecting optical signals of a second wavelength region and a third wavelength region; A first extractor unit comprising a plurality of light insertion extractors for selectively transmitting or reflecting an optical signal of the first wavelength region passing through the first three wavelength region separator according to a wavelength; A second extractor unit comprising a plurality of light insertion extractors for selectively transmitting or reflecting the optical signal of the second wavelength region reflected by the first three-wavelength region separator according to the wavelength; Reflects the optical signals of the first wavelength region and the second wavelength region included in the optical signal of the third wavelength region reflected by the first three-wavelength region separator, and transmits the optical signals of the fourth wavelength region and transmits the fifth wavelength region. A second three-wavelength region separator for reflecting the optical signal of the light; A third extractor unit comprising a plurality of light insertion extractors for selectively transmitting or reflecting an optical signal of a fourth wavelength region passing through the second three wavelength region separator according to a wavelength; And a fourth extractor unit including a plurality of light insertion extractors for selectively transmitting or reflecting the optical signal of the fifth wavelength region reflected by the second three-wavelength region separator according to the wavelength. 16 channels for low density wavelength division multiplexing including By providing a mux / demux.

In this case, it is preferable that the first and second three wavelength region separators include two filters. The first three-wavelength region separator may include: a first filter reflecting an optical signal having a wavelength of 1,270 nm to 1,450 nm and transmitting an optical signal having a wavelength of 1,470 to 1,610 nm; And a second filter for transmitting optical signals of 1550 nm, 1570 nm, 1590 nm, and 1610 nm among optical signals having wavelengths of 1,470 nm to 1,610 nm, and reflecting optical signals having the remaining wavelengths. In this case, the second filter may be a filter that reflects the optical signal of 1550nm, 1570nm, 1590nm, 1610nm of the optical signal having a wavelength of 1,470nm to 1,610nm, and transmits the optical signal having the remaining wavelength.

The second three-wavelength region separator may include a third filter that reflects an optical signal having a wavelength of 1,470 nm to 1,610 nm and transmits an optical signal having a wavelength of 1,270 nm to 1,450 nm; And a fourth filter for transmitting 1270 nm, 1290 nm, 1310 nm, and 1330 nm optical signals among the optical signals having a wavelength of 1,270 nm to 1,450 nm and reflecting the optical signals having the remaining wavelengths. In this case, the fourth filter may be a filter that reflects the optical signals of 1270nm, 1290nm, 1310nm, 1330nm among the optical signals having a wavelength of 1,270nm to 1,450nm, and transmits the optical signals having the remaining wavelengths.

In addition, the first, second, third, and fourth extractor units are preferably composed of four light insertion extractors.

In another aspect of the present invention, an object of the present invention as described above, the main optical path for transmitting an optical signal; A third three-wavelength region separator which transmits the optical signal of the sixth wavelength region and transmits the optical signals of the seventh and eighth wavelength regions of the optical signal transmitted to the optical path; A fifth extractor unit comprising a plurality of light insertion extractors for selectively transmitting or reflecting the optical signal of the sixth wavelength region passing through the third three-wavelength region separator according to the wavelength; A sixth extractor unit comprising a plurality of light insertion extractors for selectively transmitting or reflecting the optical signal of the seventh wavelength region reflected by the third third wavelength region separator according to the wavelength; A main light insertion extractor which transmits optical signals of the sixth and seventh wavelength regions included in the optical signals of the eighth wavelength region reflected by the third three-wavelength region separator and reflects the optical signals of the eighth wavelength region; And a seventh extraction unit including a plurality of light insertion extractors for selectively transmitting or reflecting the optical signal of the eighth wavelength region reflected by the main light insertion extractor according to the wavelength. 16-channel mux for low density wavelength division multiplexing including By providing a demux.

In this case, the third three-wavelength region separator may include: a first filter reflecting an optical signal having a wavelength of 1,270 nm to 1,350 nm and transmitting an optical signal having a wavelength of 1,410 nm to 1,610 nm; And a second filter for transmitting optical signals of 1,550 nm, 1,570 nm, 1,590 nm, and 1,610 nm among optical signals having a wavelength of 1,410 nm to 1610 nm, and reflecting the optical signals having the remaining wavelengths.

The main light insertion extractor may include a filter that transmits an optical signal having a wavelength of 1,410 nm to 1610 nm and reflects an optical signal having a wavelength of 1,270 nm to 1,350 nm.

Hereinafter, an embodiment of a 16 channel mux / demux for low density wavelength division multiplexing according to the present invention will be described with reference to the accompanying drawings. Hereinafter, the 16-channel mux / demux will be described based on the function of the demux for distributing the optical signal input to the optical cable to 16 channels.

FIG. 4 is a diagram schematically showing a channel configuration of a first embodiment of a 16 channel mux / demux for low density wavelength division multiplexing according to the present invention.

Referring to FIG. 4, the 16-channel mux / demux for low-density wavelength division multiplexing according to the first embodiment of the present invention is a main connector 100, two three-wavelength region separators 110 and 120, and four extractor units A to A. 16 optical insertion extractors 141 to 156 constituting D) and 16 connectors A1 to A4, B1 to B4, C1 to C4, and D1 to D4.

The main connector 100 is connected to the optical cable is connected to other mux / demux (see Figure 1). The main optical path 101 is connected to the main connector 100, and the optical signal input from the optical cable flows.

The two wavelength separators 110 and 120 are capable of separating the optical signal transmitted through the optical cable into three wavelength regions, and the optical signal of the first wavelength region among the optical signals transmitted to the first input optical line 112a is A third wavelength region separator 110 that transmits and reflects optical signals of the second wavelength region and the third wavelength region, and is included in the optical signal of the third wavelength region reflected by the first three wavelength region separator 110. And a second three-wavelength region separator 120 for reflecting the optical signals of the first wavelength region and the second wavelength region, transmitting the optical signal of the fourth wavelength region, and reflecting the optical signal of the fifth wavelength region.

An example of such a three-wavelength region separator 110 and 120 is illustrated in FIG. 5. Referring to FIG. 5, the first three wavelength region separator 110 may include a first light concentrator 111, a second light concentrator 116, first and second filters 114 and 115, and a housing 119. Have In addition, the first input optical path 112a, which will be described later, is indicated by a dashed line, the first through third output optical paths 112c, 112b, and 117a are indicated by a double-dotted line, and the optical path is shown by a solid line.

The first light concentrator 111 includes a first light transmission unit 112 and a first lens 113 having a first input light path 112a and first and second output light paths 112c and 112b.

The second light concentrator 116 has a second light transmission unit 117 and a second lens 118 having a third output light path 117a.

Each of the input optical lines 112a and the output optical lines 112b, 112c, and 117a is made of an optical fiber. In addition, the first and second light focusing apparatuses 111 and 116 are symmetrically disposed with two filters 114 and 115 to be described later.

The first and second lenses 113 and 118 are lenses for focusing and outputting the optical signals inputted to the first and second lenses 113 and 118 with linear light, and include a aspherical lens and a green-index lens (GRIN). Lenses), ball lenses, plano lenses, spherical lenses and the like.

The first and second light concentrators 111 and 116 and the two filters 114 and 115 are fixed to the housing 119 by various methods such as epoxy bonding, soldering, or laser welding.

The two filters 114 and 115 are disposed between the first and second lenses 113 and 118 spaced apart by a predetermined distance. The two filters 114 and 115 are installed to have a predetermined angle with respect to the vertical direction in the longitudinal direction of the first and second light focusing devices 111 and 116.

The two filters 114 and 115 selectively transmit or reflect the focused optical signal according to the wavelength or frequency characteristic set in each of the filters 114 and 115.

The first and second three wavelength region separators 110 and 120 will be described in detail as follows.

The first filter 114 of the first three-wavelength region separator 110 is formed within a predetermined first wavelength region and second wavelength region among the optical signals incident through the first input optical line 112a and the first lens 113. The optical signal transmits, and other optical signals, that is, the optical signal in the third wavelength region are reflected. In addition, the second filter 115 transmits an optical signal corresponding to the predetermined first wavelength region among the optical signals of the first and second wavelength regions transmitted through the first filter 114 and reflects the other optical signals. It has a characteristic to make.

The third filter 124 of the second three-wavelength region separator 120 reflects optical signals of the first and second wavelength regions included in the third wavelength region reflected from the first three-wavelength region separator 110, and the third The optical signal in the wavelength region is transmitted. In addition, the fourth filter 125 has a characteristic of transmitting part of an optical signal of the third wavelength region, that is, an optical signal of the fourth wavelength region, and reflecting an optical signal of the remaining wavelength among the optical signals of the third wavelength region. .

In the 16-channel mux / demux according to the present embodiment, the first to fourth filters 114, 115, 124, and 125 of the first and second three wavelength region separators 110 and 120 have the following characteristics, respectively.

The first filter 114 of the first three-wavelength region separator 110 reflects an optical signal having a wavelength of 1,270 nm to 1,450 nm and transmits an optical signal having a wavelength of 1,470 nm to 1,610 nm. The second filter 115 transmits optical signals of 1,550 nm, 1,570 nm, 1,590 nm, and 1,610 nm among optical signals having wavelengths of 1,470 nm to 1,610 nm, and reflects optical signals having the remaining wavelengths. At this time, although not shown, the second filter 115 reflects the optical signals of 1,550 nm, 1,570 nm, 1,590 nm, and 1,610 nm among the optical signals having a wavelength of 1,470 nm to 1,610 nm, and transmits the optical signals having the remaining wavelengths. You can also use filters.

In addition, the third filter 124 of the second three-wavelength region separator 120 reflects an optical signal having a wavelength of 1,470 nm to 1,610 nm and transmits an optical signal having a wavelength of 1,270 nm to 1,450 nm. . The fourth filter 125 transmits 1,270 nm, 1,290 nm, 1,310 nm, and 1,330 nm optical signals among the optical signals having a wavelength of 1,270 nm to 1,450 nm, and reflects the optical signals having the remaining wavelengths. At this time, although not shown, the fourth filter 125 reflects optical signals of 1,270 nm, 1,290 nm, 1,310 nm, and 1,330 nm among optical signals having wavelengths of 1,270 nm to 1,450 nm, and optical signals having the remaining wavelengths. A permeable filter can also be used.

The sixteen optical insertion extractors 141 to 156 are divided into four extractor units A, B, C, and D, that is, the first to fourth extractor units. The first to fourth extractor units A, B, C, and D have four optical insert extractors 153 to 156, 149 to 152, 141 to 144, 145 to 148, and four connectors A1 to A4 and B1, respectively. To B4, C1 to C4, and D1 to D4). The sixteen optical insertion extractors 141 to 156 include a filter that transmits only an optical signal of a specific wavelength and reflects an optical signal of other wavelengths. Hereinafter, since the configuration is general, a detailed description thereof is omitted, and each optical Only the wavelength region separated by the insertion extractors 141 to 156 will be described.

The first optical insert extractor 153 of the first extractor unit A transmits an optical signal having a wavelength of 1,550 nm among the optical signals transmitted through the first three-wavelength region separator 110 and reflects the optical signal having the remaining wavelength. The second light insert extractor 154 transmits an optical signal having a wavelength of 1,570 nm among the optical signals reflected by the first light insert extractor 153 and reflects an optical signal having the remaining wavelength. The third light insert extractor 155 transmits an optical signal having a wavelength of 1590 nm among the optical signals reflected by the second light insert extractor 154 and reflects an optical signal having a remaining wavelength. The fourth light insert extractor 156 transmits an optical signal having a wavelength of 1,610 nm among the optical signals reflected by the third light insert extractor 155 and reflects an optical signal having the remaining wavelength.

The fifth light insertion extractor 149 of the second extractor unit B transmits an optical signal having a wavelength of 1,470 nm among the optical signals reflected by the first three-wavelength region separator 110 and reflects the optical signal having the remaining wavelength. The sixth light insertion extractor 150 transmits an optical signal having a wavelength of 1490 nm among the optical signals reflected by the fifth light insertion extractor 149 and reflects the optical signal having the remaining wavelength. The seventh light insertion extractor 151 transmits an optical signal having a wavelength of 1,510 nm among the optical signals reflected by the sixth light insertion extractor 150 and reflects the optical signal having the remaining wavelength. The eighth optical insert extractor 152 transmits an optical signal having a wavelength of 1,530 nm among the optical signals reflected by the seventh optical insert extractor 151 and reflects the optical signal having the remaining wavelength.

The ninth light insertion extractor 141 of the third extractor unit C transmits the optical signal having a wavelength of 1,270 nm among the optical signals transmitted through the second three-wavelength region separator 120 and reflects the optical signal having the remaining wavelength. The tenth optical insertion extractor 142 transmits an optical signal having a wavelength of 1,290 nm among the optical signals reflected by the ninth optical insertion extractor 141 and reflects the optical signal having the remaining wavelength. The eleventh optical insertion extractor 143 transmits an optical signal having a wavelength of 1,310 nm among the optical signals reflected by the tenth optical insertion extractor 142 and reflects the optical signal having the remaining wavelength. The twelfth optical insert extractor 144 transmits an optical signal having a wavelength of 1,330 nm among the optical signals reflected by the eleventh optical insert extractor 143 and reflects an optical signal having a remaining wavelength.

The thirteenth light insertion extractor 145 of the fourth extractor unit D transmits an optical signal having a wavelength of 1,350 nm among the optical signals reflected by the second three-wavelength region separator 120 and reflects the optical signal having the remaining wavelength. The fourteenth light insertion extractor 146 transmits an optical signal having a wavelength of 1,410 nm among the optical signals reflected by the thirteenth light insertion extractor 145 and reflects the optical signal having the remaining wavelength. The fifteenth optical insert extractor 147 transmits an optical signal having a wavelength of 1,430 nm among the optical signals reflected by the fourteenth optical insert extractor 146 and reflects an optical signal having a remaining wavelength. The sixteenth optical insert extractor 148 transmits an optical signal having a wavelength of 1,450 nm among the optical signals reflected by the fifteenth optical insert extractor 147 and reflects an optical signal having a remaining wavelength.

At the rear ends of the sixteen optical insertion extractors 141 to 156, one connector A1 to D4 is connected to each other by a fusion method. In addition, the first input optical path 112a of the main optical path 101 and the first three-wavelength region separator 110, the third output optical path 117a and the first light insertion extractor of the first three-wavelength region separator 110 ( 153, the second output optical path 112b and the fifth light insertion extractor 149 of the first three-wavelength region separator 110, and the first output optical path 112c and the second of the first three-wavelength region separator 110. The first input optical path 122a of the three-wavelength region separator 120, the second output optical fiber 122b and the thirteenth light insertion extractor 145 of the second three-wavelength region separator 120, and the second three-wavelength region separator ( Between the third output optical path 127a and the ninth light insertion extractor 141, and the first to fourth light insertion extractors 153 to 156 of the 120, the fifth to eighth light insertion extractors 149 and 152. In between, the ninth to twelfth light insertion extractors 141 to 144 and the thirteenth to sixteenth light insertion extractors 145 to 148 are connected by a fusion method, respectively. In Fig. 4, the fusion spliced point is denoted by c.

Hereinafter, an operation of separating an optical signal from a 16 channel mux / demux for low density wavelength division multiplexing according to the present invention will be described with reference to FIGS. 4 and 5.

Predetermined wavelength band (1,270nm ~) incident to the first light concentrating device 111 of the first three-wavelength region separator 110 via the main connector 100, the main optical line 101 and the first input optical line 112a. The optical signal having 1610 nm is focused on the first filter 114 by the first lens 113.

The first filter 114 transmits a wavelength of 1.5 μm band, that is, 1,470 nm to 1,610 nm, and reflects the wavelength of 1.3 μm band, that is, 1,270 nm to 1,450 nm. As a result, only 1,470 nm to 1,610 nm wavelengths of the optical signals focused on the first filter 114 pass through the first filter 114 and are incident to the second filter 115, and the 1,270 nm to 1,450 nm wavelengths are It is reflected by the first output optical path 112c.

The second filter 115 transmits wavelengths of 1,550 nm, 1570 nm, 1590 nm, and 1610 nm, and reflects other wavelengths, that is, wavelengths of 1,470 nm to 1,530 nm. As a result, of the optical signals transmitted through the first filter 114, only wavelengths of 1,550 nm to 1,610 nm are transmitted through the second filter 115 to be incident on the third output optical path 117a, and 1,470 nm to 1,530 nm. Is reflected by the second output optical path 112b.

The first light extractor 141 transmits a wavelength of 1,550 nm, and reflects other wavelengths, that is, wavelengths of 1,570 nm, 1,590 nm, and 1,610 nm. As a result, of the optical signals transmitted through the second filter 115 and incident on the third output optical path 117a, only a wavelength of 1550 nm passes through the first optical insert extractor 153 to the first connector A1. Is sent.

The second light insertion extractor 154 transmits a wavelength of 1570 nm and reflects other wavelengths. As a result, only the wavelength of 1,570 nm among the optical signals reflected by the first light insert extractor 153 passes through the second light insert extractor 154 and is transmitted to the second connector A2.

The third light extractor 155 transmits a wavelength of 1,590 nm and reflects other wavelengths. As a result, only the wavelength of 1,590 nm of the optical signal reflected by the second light insert extractor 154 is transmitted through the third light insert extractor 155 and transmitted to the third connector A3.

The fourth light extractor 156 transmits a wavelength of 1,610 nm and reflects other wavelengths. As a result, of the optical signal reflected by the third light inserter 155, only a wavelength of 1,610 nm is transmitted through the fourth light inserter 156 and transmitted to the fourth connector A4.

The fifth light insertion extractor 149 transmits a wavelength of 1,470 nm, and reflects other wavelengths, that is, wavelengths of 1,490 nm, 1,510 nm, and 1,530 nm. As a result, only the wavelength of 1,470 nm of the optical signals reflected by the second filter 115 and incident on the second output optical path 112b passes through the fifth light insertion extractor 149 to allow the fifth connector B1. Is sent to.

The sixth light insertion extractor 150 transmits a wavelength of 1,490 nm and reflects other wavelengths. As a result, only the wavelength of 1,490 nm among the optical signals reflected by the fifth light insert extractor 149 passes through the sixth light insert extractor 150 and is transmitted to the sixth connector B2.

The seventh light insertion extractor 151 transmits a wavelength of 1,510 nm and reflects other wavelengths. As a result, only the wavelength of 1,510 nm among the optical signals reflected by the sixth light insertion extractor 150 passes through the seventh light insertion extractor 151 and is transmitted to the seventh connector B3.

The eighth light insertion extractor 152 transmits a wavelength of 1,530 nm and reflects other wavelengths. As a result, only the wavelength of 1,530 nm among the optical signals reflected by the seventh light insertion extractor 151 passes through the eighth light insertion extractor 152 and is transmitted to the eighth connector B4.

The predetermined wavelength band reflected by the first filter 114 of the first three-wavelength region separator 110 and incident on the first light concentrator of the second three-wavelength region separator 120 through the first output optical line 112c ( 1,270 nm to 1,450 nm) is focused to the third filter 124 by the lens.

The third filter 124 reflects a wavelength of 1.5 μm band, that is, 1,470 nm to 1,610 nm, and transmits a wavelength of 1.3 μm band, that is, 1,270 nm to 1,450 nm. As a result, only the wavelengths of 1,270 nm to 1,450 nm of the optical signals focused on the third filter 124 of the second three-wavelength region separator 120 through the first output optical line 112 c are used to connect the third filter 124. 1,470 nm transmitted and incident on the fourth filter 125 and mixed with the optical signal introduced into the second three-wavelength region separator 120 along the first output line 112c and the second input line 122a. The wavelength of ˜1,610 nm is reflected and extinguished by the fourth output optical path 122c.

The fourth filter 125 transmits wavelengths of 1,270 nm, 1,290 nm, 1,310 nm, and 1,330 nm, and reflects other wavelengths, that is, wavelengths of 1,350 nm to 1,450 nm. As a result, only 1,270 nm to 1,330 nm wavelength of the optical signal transmitted through the third filter 124 passes through the fourth filter 125 and is incident to the sixth output optical path 127a, and 1,350 nm to 1,450 nm. Is reflected by the fifth output optical path 122b.

The ninth light insertion extractor 141 transmits a wavelength of 1,270 nm and reflects other wavelengths, that is, wavelengths of 1,290 nm, 1,310 nm, and 1,330 nm. As a result, of the optical signal transmitted through the fourth filter 125, only the wavelength of 1,270 nm is transmitted through the ninth light insertion extractor 141 and transmitted to the ninth connector C1.

The tenth light insertion extractor 142 transmits a wavelength of 1,290 nm and reflects other wavelengths. As a result, of the optical signal reflected by the ninth light insertion extractor 141, only a wavelength of 1,290 nm is transmitted through the tenth light insertion extractor 142 and transmitted to the tenth connector C2.

The eleventh light insertion extractor 143 transmits a wavelength of 1,310 nm and reflects other wavelengths. As a result, only the wavelength of 1,310 nm among the optical signals reflected by the tenth optical insert extractor 142 is transmitted through the eleventh insert extractor 143 to be transmitted to the eleventh connector C3.

The twelfth light insertion extractor 144 transmits a wavelength of 1,330 nm and reflects other wavelengths. As a result, only the wavelength of 1,330 nm among the optical signals reflected by the eleventh light insertion extractor 143 passes through the twelfth light insertion extractor 144 and is transmitted to the twelfth connector C4.

The thirteenth light insertion extractor 145 transmits a wavelength of 1,350 nm, and reflects other wavelengths, that is, wavelengths of 1,410 nm, 1,430 nm, and 1,450 nm. As a result, only the wavelength of 1,350 nm is transmitted through the thirteenth insertion extractor 145 among the optical signals reflected by the fourth filter 125 and incident through the fifth output optical path 122b, and thus the thirteenth connector D1 is provided. Is sent to.

The fourteenth light insertion extractor 146 transmits a wavelength of 1,410 nm and reflects other wavelengths. As a result, of the optical signal reflected by the thirteenth optical insert extractor 145, only a wavelength of 1,410 nm is transmitted through the fourteenth optical insert extractor 146 and transmitted to the fourteenth connector D2.

The fifteenth light insertion extractor 147 transmits a wavelength of 1,430 nm and reflects other wavelengths. As a result, only the wavelength of 1,430 nm of the optical signal reflected by the fourteenth light insertion extractor 146 passes through the fifteenth light insertion extractor 147 and is transmitted to the fifteenth connector D3.

The sixteenth light insertion extractor 148 transmits a wavelength of 1,450 nm and reflects other wavelengths. As a result, of the optical signal reflected by the fifteenth light insertion extractor 147, only a wavelength of 1,450 nm is transmitted through the sixteenth light insertion extractor 148 to the sixteenth connector D4.

When the insertion loss of the 16 channel mux / demux for low density wavelength division multiplexing according to the first embodiment of the present invention having the above structure is calculated, it is shown in Table 3 below.

channel Triple Wavelength Separator Reflections Reflection Permeation Recovery Fusion splicing score Insertion Loss by Channel A1 0 0 2 3 1.29 A2 0 One 2 4 1.62 A3 0 2 2 5 1.95 A4 0 3 2 6 2.28 B1 One 0 One 3 1.09 B2 One One One 4 1.42 B3 One 2 One 5 1.75 B4 One 3 One 6 2.08 C1 One 0 2 3 1.69 C2 One One 2 4 2.02 C3 One 2 2 5 2.35 C4 One 3 2 6 2.68 D1 2 0 One 3 1.49 D2 2 One One 4 1.82 D3 2 2 One 5 2.15 D4 2 3 One 6 2.48

Herein, when the optical signal passes through the first and second three-wavelength separators 110 and 120, an insertion loss of about 0.6 dB occurs, and when the optical signal is reflected by the first and second three-wavelength separators 110 and 120, about 0.4 dB. The insertion loss was calculated based on the occurrence. In addition, an insertion loss of about 0.6 dB occurs when the optical signal passes through the optical insertion extractors 141 to 156, and an insertion loss of about 0.3 dB occurs when reflected by the light insertion extractors 141 to 156. Standard. In the case where the optical signal lines are connected by the fusion method, an insertion loss of approximately 0.03 dB occurs for each fusion splicing point c. At this time, the insertion loss of approximately 0.2 dB occurs in the main connector 100 connecting the optical cable and the 16 channel mux / demux and the connectors A1 to D4 connected to the 16 optical insertion extractors 141 to 156, respectively. Did not include.

Therefore, the insertion loss for each channel of Table 3 is calculated as follows. For example, the optical signal coming out of the A1 channel (ie, the first connector of FIG. 4) passes through the first three-wavelength region separator 110, passes through the first light insertion extractor 153, and provides three fusion splicing points. Will pass. Therefore, the insertion loss of the A1 channel is calculated as 0.4 x 0 + 0.3 x 0 + 0.6 x 2 + 0.03 x 3 = 1.29. The optical signal coming out of the C1 channel (the ninth connector of FIG. 4) is reflected by the first three-wavelength region separator 110, passes through the second three-wavelength region separator 120, and passes through the ninth light insertion extractor 141. Then, the four fusion splicing points c pass. Therefore, the insertion loss of the C1 channel is calculated as 0.4 x 1 + 0.3 x 0 + 0.6 x 2 + 0.03 x 4 = 1.72. The insertion loss of the A2 (second connector of FIG. 4) to the D4 channel (16th connector of FIG. 4) of Table 3 can be calculated in the same manner as described above. The maximum insertion loss of the 16 channel mux / demux occurs in the C4 channel (12th connector of FIG. 4), which is 2.71 dB. Therefore, the insertion loss of the 16 channel mux / demux according to the present invention is reduced by approximately 25 to 44% compared to the prior art.

FIG. 6 is a diagram schematically illustrating a channel configuration of a 16-channel mux / demux for low density wavelength division multiplexing according to a second embodiment of the present invention.

Referring to FIG. 6, a 16-channel mux / demux for low-density wavelength division multiplexing according to a second embodiment of the present invention is a main connector 100 ', a third three-wavelength region separator 130, a daylight insertion extractor 160, And sixteen optical insertion extractors 141 to 156 and sixteen connectors A'1 to D'4 constituting three extractor units A 'to C'.

Since the third three-wavelength region separator 130 has the same configuration as the first and second three-wavelength region separators 110 and 120 of the first embodiment, a detailed description thereof will be omitted. However, the third three-wavelength region separator 130 transmits an optical signal having a sixth wavelength region, that is, a wavelength of 1,550 nm to 1,610 nm, and an optical signal having a seventh and eighth wavelength region, that is, a wavelength of 1,270 nm to 1,530 nm. Reflects. In detail, the fifth filter 134 of the third wavelength region separator 130 transmits optical signals of the sixth wavelength region (1,550 nm to 1,610 nm) and the seventh wavelength region (1,410 nm to 1,530 nm). The optical signal in the eighth wavelength region (1,270 nm to 1,350 nm) is reflected. The sixth filter 135 transmits the optical signal of the sixth wavelength region and reflects the optical signal of the seventh wavelength region.

Daylight insertion extractor 160 reflects an optical signal (1,270nm ~ 1,350nm) of the eighth wavelength region reflected by the third three-wavelength region separator 130, the optical signal of the sixth and seventh wavelength region is transmitted And seven filters 161.

The sixteen light insertion extractors 141 to 156 are divided into three extractor units A ', B', and C ', that is, fifth to seventh extractor units, and the fifth extractor unit A' is divided into four light extractors. It consists of insertion extractors 153 to 156 and four connectors A'1 to A'4. The sixth extractor unit B 'is composed of seven light insertion extractors 146 to 152 and seven connectors B'1 to B'7. The seventh extractor unit C 'is composed of five light insertion extractors 141 to 145 and five connectors C'1 to C'5.

The separation of the optical signals according to the wavelengths of the sixteen optical insertion extractors 141 to 156 is similar to the above-described embodiment, and thus a detailed description thereof will be omitted.

The main connector 100 and 16 connectors 141 to 156 connected to the optical cable are connected to each other by the fusion method, and thus the detailed description thereof will be omitted.

Hereinafter, the operation of the 16 channel mux / demux according to the second embodiment having the structure as described above will be described with reference to FIG. 6.

An optical signal having a predetermined wavelength band (1,270 nm to 1610 nm) incident through the optical cable, the main connector 100, and the third input optical line 132a to the optical focusing device of the third three-wavelength region separator 130 is applied to the lens. By the fifth filter 134.

The fifth filter 134 transmits the wavelengths of the sixth and seventh wavelength regions, that is, 1,410 nm to 1,610 nm, and reflects the eighth wavelength region, that is, the wavelengths of 1,270 nm to 1,350 nm. As a result, only 1,410 nm to 1,610 nm wavelengths of the optical signals focused on the fifth filter 134 pass through the fifth filter 134 to enter the sixth filter 135, and the 1,270 nm to 1,350 nm wavelengths are It is reflected by the seventh output optical path 132c.

The sixth filter 135 transmits wavelengths of 1,550 nm, 1570 nm, 1590 nm, and 1610 nm, and reflects other wavelengths, that is, wavelengths of 1,410 nm to 1,530 nm. Accordingly, among the optical signals transmitted through the fifth filter 134, only wavelengths of 1,550 nm to 1,610 nm are transmitted through the sixth filter 135 to be incident to the ninth output optical path 137a, and 1,410 nm to 1,530 nm. Is reflected by the eighth output optical path 132b.

The optical signals having a wavelength of 1,550 nm to 1,610 nm passing through the sixth filter 135 are respectively optical signals having a wavelength of 20 nm from 1,550 nm by four optical insert extractors 153 to 156 of the fifth extractor unit A '. To be separated.

The optical signals reflected by the sixth filter 135 and transmitted to the eighth output optical path 132b are respectively driven from 1,410 nm to 20 nm by the seven light insertion extractors 146 to 152 of the sixth extractor unit B '. It is separated into optical signals of wavelength intervals.

The optical signal reflected by the fifth filter 134 to the seventh output optical path 132c is introduced into the main light insertion extractor 160. The main light insertion extractor 160 transmits an optical signal having a wavelength of 1,410 nm to 1,610 nm among the incoming optical signals and reflects an optical signal having a wavelength of 1,270 nm to 1,350 nm. Therefore, the optical signals of the fifth and sixth wavelength regions included in the optical signal reflected by the fifth filter 134 are removed. In addition, the optical signal reflected by the main light insertion extractor 160 is separated into five optical inserting units 141 to 145 of the seventh extractor unit C 'into optical signals having a wavelength of 20 nm from 1,270 nm, respectively.

Separation of the optical signal by the sixteen optical insertion extractors 141 to 156 is the same as in the above-described first embodiment, and thus a detailed description thereof is omitted.

When the insertion loss of the 16-channel mux / demux for low-density wavelength division multiplexing according to the second embodiment of the present invention having the above configuration is calculated as shown in Table 4 below.

channel Triple Wavelength Separator Reflections Reflection Permeation Recovery Fusion splicing score Insertion Loss by Channel A'1 0 0 2 3 1.29 A'2 0 One 2 4 1.62 A'3 0 2 2 5 1.95 A'4 0 3 2 6 2.28 B'1 One 0 One 3 1.09 B'2 One One One 4 1.42 B'3 One 2 One 5 1.75 B'4 One 3 One 6 2.08 B'5 One 4 One 7 2.41 B'6 One 5 One 8 2.74 B'7 One 6 One 9 3.07 C'1 One One One 4 1.42 C'2 One 2 One 5 1.75 C'3 One 3 One 6 2.08 C'4 One 4 One 7 2.41 C'5 One 5 One 8 2.74

Herein, when the optical signal passes through the third wavelength region separator 130, an insertion loss of about 0.6 dB occurs, and when the optical signal is reflected by the third wavelength region separator 130, an insertion loss of about 0.4 dB occurs. Calculated as a reference. In addition, an insertion loss of approximately 0.6 dB occurs when the optical signal passes through the optical insertion extractors 160 and 141 to 156, and an insertion of approximately 0.3 dB when reflected by the optical insertion extractors 160 and 141 to 156. It was based on the loss occurring. In the case where the optical signal lines are connected by the fusion method, an insertion loss of approximately 0.03 dB occurs for each fusion splicing point c. In this case, an insertion loss of approximately 0.2 dB is also observed in the main connector 100 connecting the optical cable and the 16 channel mux / demux and the connectors A'1 to D'4 connected to the 16 optical insertion extractors 141 to 156, respectively. Occurs but is not included in the calculation.

Therefore, the insertion loss for each channel of Table 4 is calculated as follows. For example, the optical signal coming out of the A ′ 1 channel (ie, the first connector of FIG. 6) passes through the third three-wavelength region separator 130, passes through the optical insertion extractor 143, and the three fusion splicing points ( c) will pass. Therefore, the insertion loss of the A'1 channel is calculated as 0.4 x 0 + 0.3 x 0 + 0.6 x 2 + 0.03 x 3 = 1.29. The optical signal coming out of the B'1 channel (fifth connector of FIG. 6) is reflected by the third three-wavelength region separator 130, passes through the optical insertion extractor 147, and passes through three fusion splicing points c. Done. Therefore, the insertion loss of the B'1 channel is calculated as 0.4 x 1 + 0.3 x 0 + 0.6 x 1 + 0.03 x 3 = 1.09. In addition, the optical signal coming out of the C ′ 1 channel (ie, the twelfth connector of FIG. 6) is reflected by the third three-wavelength region separator 130, is reflected by the daylight insertion extractor 160, and the light insertion extractor 141. ) And pass through the four fusion splicing points (c). Therefore, the insertion loss of the C'1 channel is calculated as 0.4 x 1 + 0.3 x 1 + 0.6 x 1 + 0.03 x 4 = 1.42. Insertion loss of the A'2 (second connector of Figure 6) to C'5 channel (16th connector of Figure 6) of Table 4 can be calculated in the same manner as described above. The maximum insertion loss of the 16 channel mux / demux is generated in the B'7 channel (the eleventh connector of FIG. 6), and is 3.07 dB. Therefore, the insertion loss of the 16 channel mux / demux according to the second embodiment of the present invention is reduced by approximately 15 to 28% compared to the prior art.

As described above, the 16-channel mux / demux for the low-density wavelength division multiplexing according to the present invention configures a three-wavelength region separator to separate an optical signal into 16 channels. Is reduced.

The present invention is not limited to the specific embodiments described above, but can be performed by a person skilled in the art to which the present invention pertains without departing from the spirit of the present invention described in the claims below. Substitutions, additions, deletions, and alterations fall within the scope of the claims.

Claims (11)

A main optical path for transmitting an optical signal; A first three wavelength region separator for transmitting an optical signal of a first wavelength region among the optical signals transmitted to the optical path and reflecting optical signals of a second wavelength region and a third wavelength region; A first extractor unit comprising a plurality of light insertion extractors for selectively transmitting or reflecting an optical signal of the first wavelength region passing through the first three wavelength region separator according to a wavelength; A second extractor unit comprising a plurality of light insertion extractors for selectively transmitting or reflecting the optical signal of the second wavelength region reflected by the first three wavelength region separator according to the wavelength; Reflects the optical signals of the first wavelength region and the second wavelength region included in the optical signal of the third wavelength region reflected by the first three-wavelength region separator, and transmits the optical signals of the fourth wavelength region and transmits the fifth wavelength region. A second three-wavelength region separator for reflecting the optical signal of the light; A third extractor unit comprising a plurality of light insertion extractors for selectively transmitting or reflecting an optical signal of a fourth wavelength region passing through the second three wavelength region separator according to a wavelength; And And a fourth extractor unit including a plurality of light insertion extractors for selectively transmitting or reflecting the optical signal of the fifth wavelength region reflected by the second three-wavelength region separator according to the wavelength. 16 channel mux / demux. The 16-channel mux / demux for low-density wavelength division multiplexing according to claim 1, wherein the first and second three wavelength region separators comprise two filters. The method of claim 2, wherein the first three wavelength region separator, A first filter reflecting an optical signal having a wavelength of 1,270 nm to 1,450 nm and transmitting an optical signal having a wavelength of 1,470 to 1,610 nm; And Low-density wavelength division multiplexing, comprising: a second filter for transmitting optical signals of 1550 nm, 1570 nm, 1590 nm, and 1610 nm among optical signals having a wavelength of 1,470 nm to 1,610 nm, and reflecting the optical signals having the remaining wavelengths; 16 channel mux / demux. The method of claim 2, wherein the first three wavelength region separator, A first filter reflecting an optical signal having a wavelength of 1,270 nm to 1,450 nm and transmitting an optical signal having a wavelength of 1,470 to 1,610 nm; And Low-density wavelength division multiplexing, comprising: a second filter for reflecting optical signals of 1550 nm, 1570 nm, 1590 nm, and 1610 nm among optical signals having a wavelength of 1,470 nm to 1,610 nm, and transmitting the optical signals having the remaining wavelengths. 16 channel mux / demux. The method of claim 2, wherein the second three wavelength region separator, A third filter for reflecting the optical signal having a wavelength of 1,470nm to 1,610nm of the optical signal, and transmitting the optical signal having a wavelength of 1,270nm to 1,450nm; And Low density wavelength division multiplexing, comprising: a fourth filter for transmitting 1270 nm, 1290 nm, 1310 nm, and 1330 nm of the optical signals having a wavelength of 1,270 nm to 1,450 nm and reflecting the optical signals having the remaining wavelengths; 16 channel mux / demux. The method of claim 2, wherein the second three wavelength region separator, A third filter for reflecting the optical signal having a wavelength of 1,470nm to 1,610nm of the optical signal, and transmitting the optical signal having a wavelength of 1,270nm to 1,450nm; And Low density wavelength division multiplexing, comprising: a fourth filter for reflecting optical signals of 1270 nm, 1290 nm, 1310 nm, and 1330 nm among optical signals having a wavelength of 1,270 nm to 1,450 nm, and transmitting the optical signals having the remaining wavelengths. 16 channel mux / demux. The 16-channel mux / demux for low-density wavelength division multiplexing according to claim 1, wherein the first, second, third, and fourth extractor units each comprise four optical insert extractors. A main optical path for transmitting an optical signal; A third three-wavelength region separator which transmits the optical signal of the sixth wavelength region and transmits the optical signals of the seventh and eighth wavelength regions of the optical signal transmitted to the optical path; A fifth extractor unit comprising a plurality of light insertion extractors for selectively transmitting or reflecting the optical signal of the sixth wavelength region passing through the third three-wavelength region separator according to the wavelength; A sixth extractor unit comprising a plurality of light insertion extractors for selectively transmitting or reflecting the optical signal of the seventh wavelength region reflected by the third third wavelength region separator according to the wavelength; A main light insertion extractor which transmits optical signals of the sixth and seventh wavelength regions included in the optical signals of the eighth wavelength region reflected by the third three-wavelength region separator and reflects the optical signals of the eighth wavelength region; And A seventh extraction unit comprising a plurality of light insertion extractors for selectively transmitting or reflecting the optical signal of the eighth wavelength region reflected by the main light insertion extractor according to the wavelength; 16 channel mux / demux. The method of claim 8, wherein the third wavelength region separator, A first filter reflecting an optical signal having a wavelength of 1,270 nm to 1,350 nm and transmitting an optical signal having a wavelength of 1,410 nm to 1,610 nm; And A second filter for transmitting optical signals of 1,550 nm, 1,570 nm, 1,590 nm, and 1,610 nm among optical signals having a wavelength of 1,410 nm to 1610 nm, and reflecting the optical signals having the remaining wavelengths; 16 channel mux / demux for wavelength division multiplexing. The method of claim 8, wherein the daylight insertion extractor, 16-channel mux / D for low-density wavelength division multiplexing comprising a filter for transmitting an optical signal having a wavelength of 1,410 nm to 1610 nm and a reflecting optical signal having a wavelength of 1,270 nm to 1,350 nm Mux. 9. The apparatus of claim 8, wherein the fifth extractor unit includes four light insert extractors, the sixth extractor unit includes seven light insert extractors, and the seventh light extractor unit includes five light insert extractors. 16-channel mux / demux for low-density wavelength division multiplexing characterized in that.

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