KR102078391B1 - Wavelength multiplexing/demultiplexing apparatus - Google Patents

Abstract

The wavelength multiplexing / demultiplexing apparatus of the present invention includes a first light transmitting body; It is provided on one side of the first light-transmitting body to reflect light from the first wavelength band to the m-th wavelength band (1 <m <n, m, n is a natural number) of the first wavelength band to the n-th wavelength band, and the m A first edge filter through which light in the +1 wavelength band to the n-th wavelength band passes; A first band pass filtering unit provided on one side of the first light transmitting body to pass light in the first wavelength band to the m wavelength band, respectively; A first reflector provided on the other side of the first light transmitting body and reflecting light incident from one side of the first light transmitting body toward one side of the first light transmitting body; A second light transmitting body; A second band pass filtering unit provided on one side of the second light transmitting body to pass light of at least a portion of the m + 1 wavelength band to the nth wavelength band, respectively; And a second reflector provided on the other side of the second light transmitting body and reflecting light incident from one side of the second light transmitting body toward one side of the second light transmitting body.

Description

Wavelength multiplexing / demultiplexing device {WAVELENGTH MULTIPLEXING / DEMULTIPLEXING APPARATUS}

The present invention relates to a wavelength multiplexing / demultiplexing device.

2. Description of the Related Art Recently, communication devices or communication systems that generate a considerable amount of data traffic are increasing. Such a large amount of data traffic may cause an overload of a communication device or communication system.

Optical communication technology is widely used to process such a large amount of data traffic. Optical communication, which is one of wired and wireless communication technologies, is a communication method using light instead of an existing electrical signal, and is capable of delivering large amounts of data at high speed without interruption.

Optical communication technology having a transmission capacity of 10 Gbps or more using optical fibers has been commercialized. Recently, optical wavelength multiplexing or demultiplexing optical communication has been used to transmit data of tens to 100 Gbps by multiplexing or demultiplexing optical signals of different wavelengths having a transmission speed of 10 Gbps or 25 Gbps to one optical fiber.

Recently, the number of channels of a wavelength multiplexing / demultiplexing device is increasing in order to increase the amount of information processed by optical communication, and research is being conducted to reduce optical loss in such multiple channel wavelength multiplexing optical communication devices.

Registered Patent 10-02658580000 (Announcement date September 15, 2000)

The wavelength multiplexing / demultiplexing apparatus according to an embodiment of the present invention is to effectively reduce the loss of optical transmission in a multi-channel optical communication apparatus.

The subject matter of the present application is not limited to the subject matter mentioned above, and another subject not mentioned will be clearly understood by a person skilled in the art from the following description.

According to one aspect of the invention, the first light transmitting body; It is provided on one side of the first light-transmitting body to reflect light from the first wavelength band to the m-th wavelength band (1 <m <n, m, n is a natural number) of the first wavelength band to the n-th wavelength band, and the m A first edge filter through which light in the +1 wavelength band to the n-th wavelength band passes; A first band pass filtering unit provided on one side of the first light transmitting body to pass light in the first wavelength band to the m wavelength band, respectively; A first reflector provided on the other side of the first light transmitting body and reflecting light incident from one side of the first light transmitting body toward one side of the first light transmitting body; A second light transmitting body; A second band pass filtering unit provided on one side of the second light transmitting body to pass light of at least a portion of the m + 1 wavelength band to the nth wavelength band, respectively; And a second reflector provided on the other side of the second light transmitting body and reflecting light incident from one side of the second light transmitting body toward one side of the second light transmitting body. Is provided.

An area where one side of the first light-transmitting body and the other side of the second light-transmitting body overlap with each other, and the first edge filter may be located in at least a portion of the area.

The length of the first edge filter may be greater than the length of the band pass filter provided in the first light transmitting body and the second light transmitting body.

The optical path between the first edge filter and the second light transmitting body is formed by an optical path forming unit, and the channel directions of the first light transmitting body and the second light transmitting body may be the same.

The optical path between the first edge filter and the second light transmitting body is formed by an optical path forming unit, and channel directions of the first light transmitting body and the second light transmitting body may be opposite to each other.

The first light transmitting body and the second light transmitting body may be connected to each other.

The optical path forming unit may bend the optical path by including a reflective mirror or a prism.

When a second edge filter is provided on the second light-transmitting body, and when the second band pass filtering unit passes light of a portion of the m + 1 wavelength band to the n-th wavelength band, respectively, the second edge filter In the m + 1 wavelength band or the rest of the n-th wavelength band, light may pass through.

The wavelength multiplexing / demultiplexing apparatus according to an aspect of the present invention further includes a third light transmitting body provided with a third band pass filtering unit for passing light of at least some of the remaining bands passing through the second edge filter, respectively. It can contain.

The wavelength multiplexing / demultiplexing apparatus according to an embodiment of the present invention can reduce loss of optical transmission by including an edge filter.

The effects of the present application are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the following description.

1 shows a wavelength multiplexer multiplexing apparatus according to an embodiment of the present invention.
FIG. 2 shows a filtering operation of the first edge filter of FIG. 1.
3 to 7 show variations of the wavelength multiplexing multiplexing apparatus according to an embodiment of the present invention.
8 illustrates a filtering operation of the first edge filter and the second edge filter of FIG. 7.
9 shows a general wavelength multiplexing / demultiplexing apparatus.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the accompanying drawings are only described to more easily disclose the contents of the present invention, and the scope of the present invention is not limited to the scope of the attached drawings, and it is easily carried out by those skilled in the art. You will know.

In addition, the terms used in the present application are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise.

In this application, the terms "include" or "have" are intended to indicate the presence of features, numbers, steps, actions, components, parts or combinations thereof described herein, one or more other features. It should be understood that the existence or addition possibilities of fields or numbers, steps, operations, components, parts or combinations thereof are not excluded in advance.

1 shows a wavelength multiplexing / demultiplexing apparatus according to an embodiment of the present invention. 1, the wavelength multiplexing / demultiplexing apparatus according to an embodiment of the present invention includes a first light transmitting body 100, a first edge filter 110, a first band pass filtering unit (BPFG1), and It includes a first reflector 130, a second light transmitting body 200, a second band pass filtering unit (BPFG2), and a second reflector 230.

The present invention may operate as a wavelength multiplexing device or a wavelength demultiplexing device. When the present invention operates as a wavelength demultiplexing device, light from the first wavelength band to the nth wavelength band is incident on the first light transmitting body 100 and the first light transmitting body 100 and the second light transmitting body 200 ), The light of the corresponding wavelength band may be output through each channel.

For example, in FIG. 1, light in the first wavelength band λ1 to the eighth wavelength band λ8 is incident on the first light transmitting body 100 and the first wavelength is transmitted through four channels of the first light transmitting body 100. Each of the bands λ1 to the fourth wavelength band λ4 is output, and each of the fifth wavelength bands λ5 to the eighth wavelength band λ8 can be output through the four channels of the second light transmitting body 200.

In addition, when the present invention operates as a wavelength multiplexing device, light from the first wavelength band to the m wavelength band is incident on each channel of the first light transmitting body 100, and from the m + 1 wavelength band to the nth wavelength band Light is incident on each channel of the second light transmitting body 200, and output light in which light in the first wavelength band or light in the nth wavelength band is mixed may be emitted through the first light transmitting body 100.

For example, in FIG. 1, each of the first wavelength band λ1 to the fourth wavelength band λ4 is incident through four channels of the first light transmitting body 100, and four channels of the second light transmitting body 200 Through each of the fifth wavelength band λ5 to the eighth wavelength band λ8 is incident, light in the first wavelength band λ1 to the eighth wavelength band λ8 may be output from the first light transmitting body 100.

Meanwhile, the first light transmitting body 100 and the second light transmitting body 200 may be made of a material capable of transmitting light of a corresponding wavelength without loss, such as glass, and these materials are not limited to glass.

The first edge filter 110 is provided on one side of the first light-transmitting body 100 so that the first wavelength band to the m wavelength band of the first wavelength band to the nth wavelength band (1 <m <n , m, n is a natural number) and reflects light from the m + 1 wavelength band to the n-th wavelength band.

For example, as shown in FIGS. 1 and 2, m is 4, n may be 8, and the first edge filter 110 reflects light in the first wavelength band λ1 to the fourth wavelength band λ4. And light of the fifth wavelength band λ1 to the eighth wavelength band λ8 can be transmitted.

The first band pass filtering unit BPFG1 is provided on one side of the first light transmitting body 100 to pass light in the first wavelength band to the m wavelength band, respectively. To this end, the first band pass filtering unit BPFG1 may include a first band pass filter to an m band pass filter for passing light in the first wavelength band to the m wavelength band, respectively.

For example, in FIG. 1, the first band pass filter (BPFG1) passes a first band pass filter (BPF1) that passes the first wavelength band λ1 and reflects the remaining wavelength band, and a second wavelength band λ2 and passes the remaining wavelength. A second band pass filter (BPF2) reflecting the band, a third band pass filter (BPF3) passing through the third wavelength band λ3 and reflecting the remaining wavelength band, and a fourth wavelength band λ4 passing through and reflecting the remaining wavelength band It may include a fourth band pass filter (BPF4).

The first reflector 130 is provided on the other side of the first light transmitting body 100 to reflect light incident from one side of the first light transmitting body 100 toward one side of the first light transmitting body 100. . The first reflector 130 may be formed in a thin film form and may be attached to or deposited on the other side of the first light transmitting body 100.

The optical path of the first light transmitting body may be formed by the first reflecting unit 130 and the first band pass filtering unit BPFG1.

The second band pass filtering unit BPFG2 is provided on one side of the second light transmitting body 200 to pass light of at least a portion of the m + 1 wavelength band to the n-th wavelength band, respectively. To this end, the first band pass filtering unit BPFG1 may include an m + 1 band pass filter to an n band pass filter that respectively pass light in the m + 1 wavelength band to the nth wavelength band.

For example, in FIG. 1, the second band pass filter (BPFG2) passes through the fifth wavelength band λ5 and passes through the fifth band pass filter (BPF5), which reflects the remaining wavelength band, and through the sixth wavelength band λ6 and the remaining wavelength. A sixth band pass filter (BPF6) reflecting the band, a seventh band pass filter (BPF7) passing through the seventh wavelength band λ7 and reflecting the remaining wavelength band, and an eighth wavelength band λ8 passing through and reflecting the remaining wavelength band It may include an eighth band pass filter (BPF8).

The second reflector 230 is provided on the other side of the second light transmitting body 200 to reflect light incident from one side of the second light transmitting body 200 toward one side of the second light transmitting body 200. . The second reflector 230 may also be formed in a thin film form and may be attached to or deposited on the other side of the second light transmitting body 200.

The optical path of the second light transmitting body may be formed by the second reflector 230 and the second band pass filtering unit BPFG2.

On the other hand, as shown in Figure 1, the first light from which the light (λ1 + λ2 + λ3 + λ4 + λ5 + λ6 + λ7 + λ8) in which the first to n-th wavelength bands are mixed is incident or emitted. The first anti-reflection unit 150 may be disposed in the transparent body 100 region.

In addition, the light passing through the first edge filter 110 of the first light-transmitting body 100 is incident, or the second light-transmitting body 200 region through which the light incident to the first edge filter 110 passes. The anti-reflection unit 250 may be disposed.

The first anti-reflection unit 150 and the second anti-reflection unit 250 may be attached or deposited in the form of a thin film.

The wavelength multiplexing / demultiplexing apparatus according to an embodiment of the present invention can reduce light loss. Hereinafter, light loss reduction of the wavelength multiplexing / demultiplexing apparatus according to an embodiment of the present invention will be described with reference to the drawings.

9 shows a general wavelength multiplexing / demultiplexing apparatus. As illustrated in FIG. 9, the expected light loss when light is output or incident through eight channels is as follows.

[Equation 1]

The Longest Optical Path (λ1) = 15d

The longest light path in the light transmitting body 10 is the light path in the wavelength band λ1 passing through the band pass filter BPF1. As the optical path becomes longer, the optical loss increases and the beam width may also increase, so that the operation of the wavelength multiplexing / demultiplexing device may not be stably performed.

[Equation 2]

Filter Loss (λ1) = 1T + 7R

Equation 2 represents the loss occurring in the eight band pass filters in the optical path of the wavelength band λ1. At this time, T is a loss due to light transmission of an arbitrary band pass filter BPFn, and R is a loss that occurs when light in the wavelength band λ1 is reflected by an arbitrary band pass filter BPFn.

Since the optical path of wavelength λ1 is transmitted once in the band pass filter BPF1 and 7 reflections are generated in the band pass filters BPF2 to BPF8, the total light loss in these filters is expressed as 2 in the above equation.

[Equation 3]

Total Loss (λ1) = Filter Loss + 1AR + 7HR

Equation 3 represents the total loss occurring in the optical path of the wavelength band λ1, and is the sum of the loss due to the anti-reflection unit and the reflection unit combined with the loss due to the band pass filter of Equation 2. At this time, HR represents the loss due to reflection in the reflector, 7HR is the loss due to light reflected in the wavelength band λ1 7 times in the reflector, AR represents the loss of light passing through the anti-reflection part, and 1AR represents the wavelength band λ1 Light may be lost due to one pass of the anti-reflection portion.

Meanwhile, Equations 4 to 6 below represent optical loss of the wavelength multiplexing / demultiplexing apparatus according to an embodiment of the present invention.

[Equation 4]

The Longest Optical Path (λ1) = 9d

The longest light path in the first light transmitting body 100 of FIG. 1 is the light path of the wavelength band λ1 passing through the band pass filter BPF1. Compared to Equation 1, it can be seen that the light path of the first light transmitting body 100 is small.

[Equation 5]

Filter Loss (λ1) = 1T + 4R

Equation 5 shows the loss due to the four band pass filters in the optical path of the wavelength band λ1. At this time, 1T is a loss due to light transmission of the band pass filter BPF1, and 4R is a loss that occurs when light in the wavelength band λ1 is reflected by the first edge filter 110 and the band pass filters BPF2 to BPF4.

It can be seen that the light loss of the first light transmitting body 100 is reduced when compared with Equation 2 described above.

[Equation 6]

Total Loss (λ1) = Filter Loss + 1AR + 4HR

Equation 6 represents the total loss occurring in the optical path of the wavelength band λ1, and the loss due to the band pass filter of Equation 5 is the sum of the losses due to the first anti-reflection unit 150 and the first reflector 130 will be. At this time, 4HR may be a loss due to reflection of light in the wavelength band λ1 four times, and 1AR may be a loss due to the passage of light in the wavelength band λ1 through the anti-reflection unit.

As described above, in the wavelength multiplexing / demultiplexing apparatus according to an embodiment of the present invention, transmission of an optical signal input or output in each channel can be efficiently performed by reducing light loss in one light transmitting body.

Meanwhile, as illustrated in FIGS. 1 and 3, there is an area where one side of the first light transmitting body 100 and the other side of the second light transmitting body 200 overlap each other, and the first edge filter 110 is present. May be located in at least a portion of the region. Through this, the light passing through the first edge filter 110 of the first light transmitting body 100 may go straight without an optical element for changing the light path to reach the second light transmitting body 200.

Meanwhile, as illustrated in FIG. 3, the length of the first edge filter 110 may be greater than the length of the band pass filter provided in the first light transmitting body 100 and the second light transmitting body 200.

When the length of the first edge filter 110 is equal to or less than the length of the band pass filters BPF1 to BPF8 as shown in FIG. 1, interference may occur between the channel through which the light in the wavelength band λ4 passes and the second light transmitting body 200. You can. Accordingly, there may not be enough space for the lens, photodiode or light source installed in the channel.

When the length of the first edge filter 110 is large as shown in FIG. 3, a space in which a lens, a photodiode or a light source installed in the channel is installed may be sufficiently secured.

Meanwhile, the optical path between the first edge filter 110 and the second light transmitting body 200 may be formed by an optical path forming unit (OPF).

For example, as illustrated in FIGS. 4 and 5, the light passing through the first edge filter 110 of the first light transmitting body 100 by the optical path forming unit OPF is an optical path forming unit ( OPF) to reach the second anti-reflection portion of the second light transmitting body 200. Conversely, the light emitted from the second light transmitting body 200 may reach the first edge filter 110 of the first light transmitting body 100 through the optical path forming unit OPF.

Accordingly, the channel directions of the first light transmitting body 100 and the second light transmitting body 200 may be the same. That is, as illustrated in FIGS. 4 and 5, it may be formed on the right side of the first light transmitting body 100 and the second light transmitting body 200. The channel direction of FIGS. 4 and 5 is only an example, and is not limited thereto. At this time, the optical path forming unit OPF may bend the optical path by including the reflection mirror RM or the prism PR.

On the other hand, the optical path between the first edge filter 110 and the second light transmitting body 200 is formed by the optical path forming unit (OPF), the first light transmitting body 100 and the second light transmitting body ( The channel directions of 200) may be opposite to each other. For example, as illustrated in FIG. 6A, a channel of the first light transmitting body 100 is formed on the right side of the first light transmitting body 100, and a channel of the second light transmitting body 200 is second It may be formed on the left side of the light transmitting body 200.

At this time, as shown in Figure 6b, the first light transmitting body 100 and the second light transmitting body 200 may be connected to each other. Accordingly, the space between the first light transmitting body 100 and the second light transmitting body 200 is eliminated, so that the volume of the present invention can be reduced.

Meanwhile, a second edge filter 210 may be provided on the second light transmitting body 200. At this time, when the second band pass filtering unit (BPFG2) passes light of a portion of the m + 1 wavelength band to the n-th wavelength band, respectively, the second edge filter 210 is the m + 1 wavelength band to the nth The rest of the light can pass through the wavelength band.

For example, as shown in FIGS. 7 and 8, the first edge filter 110 passes light in the fourth wavelength band λ4 to the 13th wavelength band λ13 among the first wavelength band λ1 to the 13th wavelength band λ13 I can do it.

In addition, the second edge filter 210 may pass light in the first wavelength band λ1 to the seventh wavelength band λ7 among the first wavelength bands λ1 to 13th wavelength band λ13.

At this time, since the light of the first wavelength band λ1 to the third wavelength band λ3 is reflected by the first edge filter 110, the light actually passing through the second edge filter 210 is the fourth wavelength band λ4 to the seventh wavelength It can be seen that the light is in the band λ7. That is, as illustrated in FIG. 8, light actually passing through the second edge filter 210 may be light in a wavelength band capable of simultaneously passing through the first edge filter 110 and the second edge filter 210. have.

Light of the eighth wavelength band λ8 to the thirteenth wavelength band λ13 reflected by the second edge filter 210 of FIG. 7 may be reflected by the second reflector 230 of the second light transmitting body 200. .

In addition, in the wavelength multiplexing / demultiplexing apparatus according to an embodiment of the present invention, a third band pass that passes light of at least some of the remaining bands (eg, λ4 to λ7) that have passed through the second edge filter 210, respectively. A third light transmitting body 300 having a filtering unit BPFG3 may be further included.

Some of the 8th to 13th wavelength bands (λ8 to λ13) reflected by the second edge filter 210 (λ8 to λ9) pass through the channel of the second light transmitting body 200 and the rest (λ10 to λ13) Each light may pass through the second light transmitting body 200 through the second reflector 230 and another second antireflection unit 250 ′.

At this time, the light of each of the remaining (λ10 ~ λ13) may pass through the channel of the fourth light transmitting body 400 through each of the band pass filter BPF10 to the band pass filter BPF13.

A third band pass filtering unit BPFG3 including a fourth band pass filter BPF4 to a seventh band pass filter BPF7 may be provided on one side of the third light transmitting body 300.

In addition, a third reflection unit 330 for reflection of light and a third reflection prevention unit 350 for preventing reflection of light when input / output of light may be provided on the other side of the third light transmitting body 300. .

A fourth band pass filtering unit BPFG4 including a tenth band pass filter BPF10 to a thirteenth band pass filter BPF13 may also be provided on one side of the fourth light transmitting body 400.

In addition, the other side of the fourth light transmitting body 400 may be provided with a fourth reflection unit 430 for reflection of light, and a fourth reflection prevention unit 450 for preventing reflection of light during input and output of light. .

As described above, the embodiments according to the present invention have been reviewed, and the fact that the present invention can be embodied in other specific forms without departing from the spirit or scope of the embodiments described above are those with ordinary knowledge in the art. It is self-evident. Therefore, the above-described embodiments are to be regarded as illustrative rather than restrictive, and accordingly, the present invention is not limited to the above description and may be changed within the scope of the appended claims and their equivalents.

First light transmitting body 100
First edge filter (110)
First band pass filtering unit (BPFG1)
First reflector 130
First anti-reflection unit 150
Second light transmitting body 200
Second edge filter (210)
Second band pass filtering unit (BPFG2)
The second reflector 230
Second anti-reflection unit 250
1st to 8th band pass filters (BPF1 to BPF 8)
Optical path forming part (OPF)
Third light transmitting body 300
4th light transmitting body 400

Claims (9)

A first light transmitting body;
It is provided on one side of the first light-transmitting body to reflect light from the first wavelength band to the m-th wavelength band (1 <m <n, m, n is a natural number) of the first wavelength band to the n-th wavelength band, and the m A first edge filter through which light in the +1 wavelength band to the n-th wavelength band passes;
A first band pass filtering unit provided on one side of the first light transmitting body to pass light in the first wavelength band to the m wavelength band, respectively;
A first reflector provided on the other side of the first light transmitting body and reflecting light incident from one side of the first light transmitting body toward one side of the first light transmitting body;
A second light transmitting body;
A second band pass filtering unit provided on one side of the second light transmitting body to pass light of at least a portion of the m + 1 wavelength band to the nth wavelength band, respectively; And
It is provided on the other side of the second light transmitting body includes a second reflecting unit for reflecting light incident from one side of the second light transmitting body toward one side of the second light transmitting body,
There is a region where one side of the first light transmitting body and the other side of the second light transmitting body overlap each other, and the first edge filter is located in at least part of the region,
The length of the first edge filter is greater than the length of the band pass filter of the first band pass filtering unit,
The band pass filter of the first band pass filtering unit is disposed on one side of the first light transmitting body so as to be adjacent to the first edge filter,
An anti-reflection unit is disposed in an area of the second light transmitting body through which light passing through the first edge filter is incident or light entering the first edge filter passes therethrough,
Wavelength multiplexing / demultiplexing, characterized in that the region of the second light-transmitting body in which the anti-reflection unit is disposed is included in an area where one side of the first light-transmitting body and the other side of the second light-transmitting body overlap each other. Device.
delete delete delete delete delete delete According to claim 1,
A second edge filter is provided on the second light transmitting body,
When the second band pass filtering unit passes light from a portion of the m + 1 wavelength band to the n-th wavelength band, respectively, the second edge filter is selected from the m + 1 wavelength band to the n-th wavelength band. A wavelength multiplexing / demultiplexing device characterized by passing the rest of the light.
The method of claim 8,
The wavelength multiplexing / demultiplexing apparatus further comprising a third light transmitting body equipped with a third band pass filtering unit for passing light of at least some of the remaining bands passing through the second edge filter.

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