KR101362406B1 - Multi-wavelength optical transmitting and receiving module - Google Patents

Abstract

Disclosed are a multi-wavelength optical transmission and reception module that can be applied to multiplexing or demultiplexing optical signals of various wavelengths. The optical transmission module includes a housing, an optical output block, an optical transmission block, and an optical MUX block. The housing has first and second coupling holes formed at both sides facing each other. The optical output block is coupled to the housing corresponding to the first coupling hole and connected to the optical signal connector, and the first lens is embedded therein. The optical transmission block is coupled to the housing in correspondence with the second coupling hole and connected to the electrical signal connector. The optical transmission block outputs light of different wavelengths and is arranged in parallel with the optical output block. On the light output side of the light emitting device, second lenses are arranged to correspond to the transmitting elements respectively. The optical mux block is disposed in the housing, and is output from the transmission elements and multiplexes the multi-wavelength optical signals passing through the second lenses to the optical output block. Accordingly, since the optical signal input / output connector and the electrical signal input / output connector can be arranged in a straight line, it can be advantageous for modularization and miniaturization.

Description

Multi-wavelength optical transmitting and receiving module

The present invention relates to a multi-wavelength optical transmission and reception module that can be applied to multiplexing or demultiplexing optical signals of various wavelengths. This study is derived from the research conducted as part of the IT source technology development project of the Ministry of Knowledge Economy. [Task Management No .: 2008-F-017-02, Title: Development of 100Gbps Ethernet and Optical Transmission Technology]

Due to the increase in data traffic led by the Internet, optical communication networks are also increasing in speed and capacity. In order to transmit a large amount of data traffic, wavelength division multiplexing (WDM) of optical signals having different wavelengths is widely used in one optical fiber. The wavelength division multiplexing technique has been mainly used in a backbone network, but is also applied to an access loop network and an ethernet network.

In case of 40G Ethernet, 10G 채널 4 channel coarse wavelength division multiplexing (CWDM) method is adopted as standard for 10km transmission of single mode fiber, and in case of 100G Ethernet, 10km and 40km transmission of single mode fiber is used. 25G ㅧ 4 channel LAN-WDM is adopted as standard.

In the 40G and 100G Ethernet, four channels are multiplexed and transmitted by an optical transceiver module. The key components are a transmitter optical sub-assembly (TOSA) and a receiver optical sub-assembly (ROSA). TOSA performs four-channel pre-optical conversion and wavelength multiplexing. ROSA performs wavelength demultiplexing and four-channel photoelectric conversion.

1 illustrates an optical transmission / reception module according to a conventional example (see US Application No. 2004-971462).

As shown in FIG. 1, the optical transmission / reception module 10 is configured to include a ROSA function. Accordingly, when optical signals having various wavelengths are incident to the thin film filters 12a, 12b, 12c, and 12d arranged in a pentagonal shape through the receptacle 11, the thin film filters 12a, 12b, 12c, and 12d are provided. Only the optical signal of the corresponding wavelength is transmitted, and the optical signal of the remaining wavelength is reflected. The optical signals λ1, λ2, λ3, and λ4 transmitted through the thin film filters 12a, 12b, 12c, and 12d are input to the photo detector elements 13a, 13b, 13c, and 13d, and are converted into electrical signals. .

In the above example, if the optical transmission / reception module 10 is configured to include a TOSA function, the photo detector elements are replaced with laser diode elements. When the optical signals of various wavelengths output from the laser diode elements are incident on the thin film filters, only the optical signals of the corresponding wavelengths are transmitted by the thin film filters, and the optical signals of the remaining wavelengths are reflected and output through the receptacle.

However, the optical transmission / reception module 10 of the above-described example may have a lot of difficulty in designing an interface of the electrical signal since the input / output portions of the electrical signal are arranged scattered in various positions and in various directions. ) Can be a limitation in miniaturization.

2 illustrates an optical transmission / reception module according to another conventional example (see US Pat. No. 6198864).

As shown in FIG. 2, the optical transmission / reception module 20 is configured to include a ROSA function. According to this, a series of relay mirrors 22a, 22b and 22c are recessed and integrated in the optical block 21. When optical signals having various wavelengths are incident to the optical block 21 through the optical fiber 23, only the optical signals of the corresponding wavelengths are transmitted by the filters 24a, 24b, 24c, and 24d, and the optical signals of the remaining wavelengths are reflected. It is spread by repeating the process. The optical signals transmitted through the filters 24a, 24b, 24c, and 24d in turn are inputted to the photodiodes 25a, 25b, 25c, and 25d and converted into electrical signals, and the filters 24a, 24b, 24c, and 24d are provided. The light reflected by it is continuously focused by the relay mirrors 22a, 22b, 22c.

However, in the case of single mode reception, the diameter of the light receiving region of the photodiode is about several tens of micrometers, and in the case of single mode transmission, the diameter of the core of the optical fiber is about 8 μm. Therefore, in the case of the optical transmission / reception module 20 of the above-described example, when a processing error occurs, the loss of the optical signal is greatly generated. In addition, there is a disadvantage in that the light loss due to the alignment is greatly generated because the alignment tolerance is smaller than the method using the lens, and ultimately, the productivity is inferior.

An object of the present invention is to provide a multi-wavelength optical transmission and reception module that is arranged in a straight line and the optical signal input / output connector and the electrical signal input / output connector advantageous for modularization and miniaturization.

In addition, an object of the present invention is to provide a multi-wavelength optical transmission and reception module which has a high tolerance in aligning a multi-wavelength channel, easy alignment, high production yield, and ultimately good productivity.

According to an aspect of the present invention, there is provided a multi-wavelength optical transmission module comprising: a housing having first and second coupling holes formed at both sides facing each other; An optical output block coupled to the housing corresponding to the first coupling hole and connected to an optical signal connector, the optical output block having a first lens therein; A plurality of transmission elements coupled to the housing corresponding to the second coupling hole and connected to an electrical signal connector, respectively outputting light having different wavelengths and arranged side by side with respect to the light output block; An optical transmission block having second lenses arranged on the light output side of the light emitting device to correspond to the transmission elements; And an optical mux block disposed in the housing and output from the transmission elements to multiplex the multi-wavelength optical signals passing through the second lenses to the optical output block.

Multi-wavelength light receiving module according to the present invention, the housing is formed with first and second coupling holes on both sides facing each other; An optical input block coupled to the housing corresponding to the first coupling hole and connected to an optical signal connector, the optical input block having a first lens therein; A plurality of receivers coupled to the housing corresponding to the second coupling hole and connected to an electrical signal connector, respectively receiving optical signals having different wavelengths and arranged side by side with respect to the optical input block; An optical reception block having second lenses arranged on the optical input side of the devices so as to correspond to the receivers; And an optical DEMUX block disposed in the housing and input from the optical input block to demultiplex the multiplexed optical signals passing through the first lens to the receiving elements.

According to the present invention, since the optical signal connector and the electrical signal connector can be arranged in a straight line, it is easy to design and manufacture the module can be advantageous for modularization. In addition, since the transmission elements and the second lenses form an array in the optical transmission block, miniaturization is possible, which may ultimately be advantageous for miniaturization of the module.

According to the present invention, since the light output block, the optical transmission block, and the optical mux block are manufactured independently of each other and tested, the light output block, the optical transmission block, and the optical mux block may be aligned with each other in units of blocks, thereby increasing production yield.

According to the present invention, when the optical transmission / reception block is composed of optical transmission / reception subblocks in the form of independent channels, each channel can be easily manufactured through a thio process. In addition, since each channel can be independently aligned, the alignment process is easy and light loss can be minimized for each channel. In addition, since manufacturing is performed for each channel, the defective rate can be lowered, and ultimately, mass productivity can be improved.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

3 is a cross-sectional view of a multi-wavelength optical transmission module according to an embodiment of the present invention. Referring to FIG. 3, the multi-wavelength optical transmission module 100 includes a housing 110, an optical output block 120, an optical transmission block 130, and an optical multiplexer block 140. ).

The housing 110 has an internal space and has a structure in which first and second coupling holes 111 and 112 are formed at both sides facing each other. The light output block 120 is correspondingly coupled to the first coupling hole 111, and the light transmission block 130 is correspondingly coupled to the second coupling hole 112. The first and second coupling holes 111 and 112 may have a size to which the optical output block 120 and the optical transmission block 130 are partially inserted and mounted.

The light output block 120 is connected to the optical signal connector and is coupled to the housing 110 so as to correspond to the first coupling hole 111. The light output block 120 may be partially fitted into the first coupling hole 111. The first lens 121 is built in the light output block 120. The first lens 121 is disposed to pass the optical signals multiplexed by the optical mux block 140 to the optical signal connector.

The optical transmission block 130 is connected to the electrical signal connector and is coupled to the housing 110 so as to correspond to the second coupling hole 112. The optical transmission block 130 may be partially fitted into the second coupling hole 112. The optical transmission block 130 includes a plurality of transmission elements 131a, 131b, 131c and 131d and second lenses 132a, 132b, 132c and 132d.

The transmission elements 131a, 131b, 131c, and 131d receive electrical signal data for multi-wavelength transmission from an electrical signal connector, and output optical signals having different wavelengths, respectively. The transmission elements 131a, 131b, 131c, and 131d may be composed of laser diodes that oscillate optical signals having different wavelengths. In addition, the transmission elements 131a, 131b, 131c, and 131d are arranged side by side with respect to the light output block 120.

The second lenses 132a, 132b, 132c, and 132d are arranged to correspond to the transmission elements 131a, 131b, 131c, and 131d on the light output side of the transmission elements 131a, 131b, 131c, and 131d, respectively. The second lenses 132a, 132b, 132c, and 132d are spaced apart from the transmission elements 131a, 131b, 131c, and 131d at regular intervals, and the optical axes of the second lenses 132a, 132b, 131c, and 131d are separated from each other. It can be arranged to coincide with each output axis.

The optical mux block 140 is disposed in the housing 110 between the optical output block 120 and the optical transmission block 130. The optical mux block 140 multiplexes the multi-wavelength optical signals output from the transmission elements 131a, 131b, 131c, and 131d and passes through the second lenses 132a, 132b, 132c and 132d. ).

In the multi-wavelength optical transmission module 100 having the above-described configuration, since the optical signal connector connected to the optical output block 120 and the electrical signal connector connected to the optical transmission block 130 may be disposed in a straight line, the module The design and manufacture of the 100 can be facilitated and can be advantageous for modularization. In the optical transmission block 130, since the transmission elements 131a, 131b, 131c and 131d and the second lenses 132a, 132b, 132c and 132d form an array, miniaturization is possible, and ultimately, the module ( 100) can be advantageous in miniaturization.

In addition, since the light output block 120, the light transmission block 130, and the optical mux block 140 are manufactured independently of each other and tested, the light output block 120, the optical transmission block 130, and the optical mux block 140 may be aligned with each other in units of blocks, thereby increasing production yield.

Meanwhile, the optical output block 120 may be connected to the optical signal connector in the form of a receptacle 122. Here, the optical signal connector may be of an LC (lucent cable) or a SC (single coupling) type. As another example, although not shown, the optical output block 120 may be replaced with an optical fiber pigtail in the form of the receptacle 122 to be connected to the optical signal connector. An optical isolator may be added to the optical output block 120 to reduce the influence of reflected light when coupled with the optical fiber.

In addition, the optical transmission block 130 includes a sub-mount 133, a transistor outline (TO) stem 134, a lens cap 135, and an alignment mark (not shown). can do. The sub-mount 133 mounts the array of transmission elements 131a, 131b, 131c, and 131d toward the second lenses 132a, 132b, 132c, and 132d. Thio stem is prepared by the thio process. The thio stem 134 is mounted on the outside of the sub mount 133 and is connected to the electrical signal connector. The thi stem 134 has lead pins 134a for connection with an electrical signal connector. The lead pins 134a are arranged to be drawn out of the housing 110.

The lens cap 135 focuses the second lenses 132a, 132b, 132c, and 132d between the second lenses 132a, 132b, 132c and 132d and the transmission elements 131a, 131b, 131c and 131d. Support accordingly. The second lenses 132a, 132b, 132c, and 132d may be continuously arranged in a single shape. In this case, the lens cap 135 may connect the second lenses 132a, 132b, 132c, and 132d of the single shape. The surface facing the optical mux block 140 may be formed in a recessed shape so as to accommodate and support the optical mux block 140. In addition, the lens cap 135 has a structure that can be assembled with the sub-mount 133 and the thi stem 134, the transmission element (131a, 131b, 131c, 131d) and the second lens (132a, 132b, 132c) The focal lengths between the 132d are aligned to allow the second lenses 132a, 132b, 132c, and 132d to be fixed.

The alignment mark is for aligning between the transmission elements 131a, 131b, 131c and 131d and the second lenses 132a, 132b, 132c and 132d. In other words, the alignment marks allow the output axes of the transmitting elements 131a, 131b, 131c, and 131d to be aligned with the optical axes of the second lenses 132a, 132b, 132c, and 132d exactly. Alignment marks may be formed on the lenses 132a, 132b, 132c, and 132d and the submount 133, respectively.

A flexible PCB may be mounted on the lead pins 134a in the optical transmission block 130, and a monitoring optical element for monitoring the light intensity of the transmission elements 131a, 131b, 131c, and 131d may be added. Can be. In addition, when the VCSEL (vertical-cavity surface-emitting laser) is used as the transmission elements 131a, 131b, 131c, and 131d, a reflector reflecting part of the light output may be provided with the transmission elements 131a, 131b, 131c, and 131d. It can be placed between the two lenses (132a, 132b, 132c, 132d). If an electro-absorption modulated laser (EML) is used as the transmission elements 131a, 131b, 131c, and 131d, a thermo-electric cooler (TEC) for maintaining a constant temperature may be added.

4 is a cross-sectional view showing a first modification of the optical transmission block in FIG. Referring to FIG. 4, the optical transmission block 230 includes a plurality of optical transmission subblocks 230a, 230b, 230c, and 230d separately separated for each optical wavelength channel. That is, the optical transmission subblocks 230a, 230b, 230c, and 230d independently include transmission elements 231a, 231b, 231c, and 231d that output optical signals having different wavelengths. The optical transmission subblocks 230a, 230b, 230c, and 230d may include the second lenses 232a, 232b, 232c, and 232d, the sub mounts 233a, 233b, 233c, and 233d, and the tiosystems 234a, 234b, and 234c. And 234d) and lens caps 235a, 235b, 235c, and 235d independently of each other in a separate form.

As such, when the optical transmission block 230 is composed of the optical transmission sub-blocks 230a, 230b, 230c, and 230d in the form of independent channels, each channel can be easily manufactured through a thio process. In addition, since each channel may be independently aligned, the alignment process may be easily performed, and light loss may be minimized for each channel. In addition, since manufacturing is performed for each channel, the defective rate can be lowered, and ultimately, mass productivity can be improved.

5 is a cross-sectional view illustrating a second modification of the optical transmission block in FIG. 3. Referring to FIG. 5, in the optical transmission block 330, the second lenses 332a, 332b, 332c, and 332d are formed in a separated form, not in a continuous form in the above-described example. The second lenses 332a, 332b, 332c, and 332d have a shape corresponding to each of the transmission elements 131a, 131b, 131c, and 131d. Here, the lens cap 335 may be configured to support the second lenses 332a, 332b, 332c, and 332d in a separated form.

6A and 6B are plan cross-sectional views and side cross-sectional views showing a third modification of the optical transmission block in FIG. 3. 6A and 6B, the optical transmission block 430 includes a sub mount 433 and a metal wall 434. The submount 433 mounts the second lenses 132a, 132b, 132c, and 132d and the transmission elements 131a, 131b, 131c, and 131d. Here, the sub mount 433 may be made of metal. The transmission elements 131a, 131b, 131c, and 131d are mounted on the ceramic plate 435 stacked on the sub mount 433, and are mounted on the optical axes of the second lenses 132a, 132b, 132c, and 132d. Correspondingly arranged. The ceramic plate 435 may be made of aluminum oxide, aluminum nitride, or the like.

The metal wall 434 is mounted on the outside of the sub mount 433 and is connected to the electrical signal connector. The metal wall 434 has lead pins 434a for connection with an electrical signal connector. The lead pins 434a are arranged to be drawn out of the housing 110. The lead pins 434a may be connected to the transmission elements 131a, 131b, 131c, and 131d through wire bonding.

As described above, when the optical transmission block 430 uses the metal wall 434 instead of the thio stem 134 of the optical transmission block 130, the optical transmission block 430 is connected to the electrical signal interface at a higher speed than using the thio stem 134. Can be applied.

FIG. 7 is a cross-sectional view illustrating an example of an optical mux block applied to the multi-wavelength optical transmission module of FIG. 3.

Referring to FIG. 7, the optical mux block 240 includes an optical transmission block (W) such that an interval between the transmission elements 131a facing the first lens 121 among the transmission elements 131a, 131b, 131c, and 131d is widest. 130 may be arranged obliquely at a predetermined angle θ. This means that the optical signals outputted from the transmission elements 131b, 131c, and 131d other than the transmission element 131a facing the first lens 121 among the transmission elements 131a, 131b, 131c, and 131d are output to the optical output block ( So that it can be guided to. In this case, the light output block 120 and the light transmission block 130 may be disposed on the housing 110 such that the first lens 121 faces the one of the transmission elements 131a, 131b, 131c, and 131d. Can be combined.

The optical mux block 240 may include a transparent body 241, an antireflection layer 242, a total reflection layer 243, and thin film filters 244a, 244b, 244c and 244d. The transparent body 241 is made of a transparent material for light transmission. The transparent body 241 forms a first inclined surface 241a inclined closer to the first lens 121 as the surface facing the light output block 120 toward the first lens 121, and the light transmission block 130. ) Has a structure forming a second inclined surface 241b inclined in parallel with the first inclined surface 241a. Accordingly, the transparent body 241 may be disposed at an angle to the optical transmission block 130 at an angle θ.

The antireflective layer 242 is formed in a region corresponding to the first lens 121 on the first inclined surface 241a, and the total reflection layer 243 is other than a region in which the antireflective layer 242 is formed on the first inclined surface 241a. Is formed in the area of. Accordingly, the optical signals entering the transparent body 241 may pass through only the region where the anti-reflective layer 242 is formed on the first inclined surface 241a and enter the first lens 121.

The antireflection layer 242 is formed in the entire region of the second inclined surface 241b. This is to allow the optical signal transmitted through the thin film filters 244a, 244b, 244c and 244d to penetrate the second inclined surface 241b and enter the transparent body 241.

The thin film filters 244a, 244b, 244c, and 244d selectively transmit only one optical signal among the optical signals of various wavelengths output from the transmission elements 131a, 131b, 131c and 131d, and light of the remaining wavelengths. And to reflect the signal. Here, the thin film filters 244a, 244b, 244c, and 244d are disposed on the second inclined surface 241b to have one-to-one correspondence with the transmission elements 131a, 131b, 131c and 131d, and the one-to-one correspondence of the transmission elements 131a, It is arranged to transmit only the optical signal of the wavelength output from 131b, 131c, and 131d, respectively.

An example of the operation of the multi-wavelength optical transmission module to which the aforementioned optical mux block 240 is applied is as follows.

First, when electrical signal data for multi-wavelength transmission is input to the transmission elements 131a, 131b, 131c, and 131d through the electrical signal connector, the pre-optical conversion is performed at the transmission elements 131a, 131b, 131c, and 131d. Is done. Optical signals having different wavelengths are output according to the output wavelengths of the transmission elements 131a, 131b, 131c, and 131d, and the thin film filters 244a, 244b, and the second lenses 132a, 132b, 132c, and 132d. 244c, 244d). In this case, when the second lenses 132a, 132b, 132c, and 132d are formed of collimating lenses, the optical signals are made of parallel light and incident to the thin film filters 244a, 244b, 244c, and 244d.

Then, the thin film filters 244a, 244b, 244c and 244d transmit only an optical signal having a wavelength output from one-to-one corresponding transmission elements 131a, 131b, 131c and 131d. The optical signals transmitted through the thin film filters 244a, 244b, 244c and 244d pass through the antireflection layer 242 of the second inclined surface 241b and enter the inside of the transparent body 241. Thereafter, the optical signal transmitted through the thin film filter 244a located on the leftmost side of the thin film filters 244a, 244b, 244c, and 244d proceeds to the antireflective layer 242 of the first inclined surface 241a and the remaining thin film filters. The optical signals passing through the fields 244b, 244c, and 244d are reflected in the zigzag form by the total reflection layer 243 and the thin film filters 244a, 244b, and 244c to the anti-reflective layer 242 of the first inclined surface 241a. Proceed. Finally, the multi-wavelength optical signals pass through the antireflective layer 242 of the first inclined surface 241a after being multiplexed. Thereafter, the multiplexed optical signals are coupled to the core of the optical fiber via the first lens 121 and the receptacle 122.

8 is a cross-sectional view illustrating a case where another example of an optical mux block is applied to the multi-wavelength optical transmission module of FIG. 3.

Referring to FIG. 8, the optical mux block 340 is configured of a PLC (Planar Light-wave Circuit) device through which light, such as silica or silicon, may be transmitted and guided.

The PLC device may be configured as an arrayed waveguide grating (AWG) or a grating filter for separating or combining light wavelengths. As another example, the PLC device may be configured as a splitter or coupler that separates or combines optical power. The first lens 121 of the light output block 320 and the second lenses 132a, 132b, 132c, and 132d of the light transmission block 130 are coupled to the coupling lens instead of the collimating lens of the above-described example. It is composed of

An example of the operation of the multi-wavelength optical transmission module to which the aforementioned optical mux block 340 is applied is as follows.

First, when electrical signal data for multi-wavelength transmission is input to the transmitting elements through the electrical signal connector, all-optical conversion is performed in the transmitting elements 131a, 131b, 131c, and 131d. Optical signals of different wavelengths are output according to the output wavelengths of the transmission elements 131a, 131b, 131c, and 131d, and the output optical signals pass through the second lenses 132a, 132b, 132c, and 132d. The input is coupled to the waveguide core of block 340. Thereafter, the multiple wavelength optical signals are multiplexed and the multiplexed optical signals are coupled to the core of the optical fiber through the first lens 121 and the receptacle 122.

9 is a cross-sectional view of a multi-wavelength light receiving module according to an embodiment of the present invention. 9, the multi-wavelength light receiving module 500 includes a housing 510, an optical input block 520, an optical receiving block 530, and an optical DEMUX block 540. . In the multi-wavelength light receiving module 500 of the present embodiment, the transmission elements 131a, 131b, 131c, and 131d have the reception elements 531a, 531b, 531c, and 531d as opposed to the above-described multi-wavelength light transmission module 100. It has substantially the same structure, except that it is replaced by).

Receiving elements 531a, 531b, 531c, and 531d receive optical signals of different wavelengths, respectively, and output them to an electrical signal connector. The receiving elements 531a, 531b, 531c, and 531d may be configured with photo diodes for receiving optical signals having different wavelengths. On the other hand, the optical input block 520 receives the multiplexed multi-wavelength optical signals. When the optical demux block 530 receives the multiplexed multi-wavelength optical signals from the optical input block 520, the optical demux block 530 demultiplexes the received optical signals and delivers the received optical signals to the receivers 531a, 531b, 531c, and 531d.

Like the multi-wavelength light transmission module 100 described above, the multi-wavelength light receiving module 500 is easy to design and manufacture the module 500, which may be advantageous in modularization and miniaturization. In addition, since the light input block 520, the light receiving block 530, and the optical demux block 540 are manufactured independently of each other and tested, the light input block 520, the light receiving block 530, and the light demux block 540 may be aligned with each other in units of blocks, thereby increasing production yield.

Meanwhile, as other examples of the light receiving block 530, the light receiving blocks 530 may have substantially the same structure as the light transmitting blocks 230, 330, and 430 illustrated in FIGS. 4 to 6. However, there is a difference in that the transmitting elements 131a, 131b, 131c, and 131d are replaced with the receiving elements 531a, 531b, 531c, and 531d.

Also, as examples of the optical demux block 540, the optical demux block 540 may have a structure substantially the same as that of the optical mux blocks 240 and 340 illustrated in FIGS. 7 and 8. However, when receiving the multiplexed multiple wavelength optical signals from the optical input block 520, there is a difference in that the received optical signals are demultiplexed.

As shown in FIG. 10, the operation example of the multi-wavelength light receiving module to which the optical demux block 640 having the same structure as that of the optical mux block 240 of FIG. 7 is applied will be described below. First, multiplexed multi-wavelength optical signals are input to the optical input block 520 through the optical signal connector. Then, the optical signals pass through the anti-reflective layer 242 of the first lens 121 and the first inclined surface 241a to enter the transparent body 241, and then proceed to the leftmost thin film filter 244a. do.

Then, the leftmost thin film filter 244a transmits only the optical signal of the corresponding wavelength among the optical signals and reflects the remaining optical signals. The reflected optical signals are reflected by the total reflection layer 243 and the thin film filters 244b and 244c again in a zigzag manner. In this process, the thin film filters 244b, 244c, and 244d transmit only the optical signal of the corresponding wavelength. Finally, the multi-wavelength optical signals pass through the antireflective layer 242 of the second slope 241b after being demultiplexed. Thereafter, the demultiplexed optical signals are input to the receivers 531a, 531b, 531c, and 531d through the second lenses 132a, 132b, 132c, and 132d. In the reception elements 531a, 531b, 531c, and 531d, the photoelectric conversion is performed and then output to the electrical signal connector.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation and that those skilled in the art will recognize that various modifications and equivalent arrangements may be made therein. It will be possible. Accordingly, the true scope of protection of the present invention should be determined only by the appended claims.

1 is a cross-sectional view of an example of a conventional multi-wavelength optical transmission and reception module.

Figure 2 is a cross-sectional view of another example of a conventional multi-wavelength optical transmission and reception module.

3 is a cross-sectional view of a multi-wavelength light transmission module according to an embodiment of the present invention.

4 is a cross-sectional view showing a first modification of the optical transmission block in FIG.

5 is a cross-sectional view showing a second modification of the optical transmission block in FIG.

6A and 6B are a plan sectional view and a side sectional view of a third modification of the optical transmission block in FIG.

FIG. 7 is a cross-sectional view to which an example of an optical mux block is applied in FIG. 3; FIG.

8 is a cross-sectional view to which another example of the optical mux block is applied in FIG. 3.

9 is a cross-sectional view of a multi-wavelength light receiving module according to an embodiment of the present invention.

FIG. 10 is a cross-sectional view to which an example of the optical demux block is applied in FIG. 9; FIG.

BRIEF DESCRIPTION OF THE DRAWINGS FIG.

110,510. Housing 120. Light output block

130,230,330,430 .. optical transmission block 131a, 131b, 131c, 131d..transmitter

140,240,340..Gwangmux Block 241.Transparent Body

242..Anti-reflective layer 243..Anti-reflective layer

244a, 244b, 244c, 244d .. Thin-film filter 520 .. Optical input block

530. Optical receiving block 531a, 531b, 531c, 531d. Receiver

540,640..Gwang Demux Block

Claims (20)

A housing having first and second coupling holes formed at both sides facing each other; An optical output block coupled to the housing corresponding to the first coupling hole and connected to an optical signal connector, the optical output block having a first lens therein; A plurality of transmission elements coupled to the housing corresponding to the second coupling hole and connected to an electrical signal connector, respectively outputting light having different wavelengths and arranged side by side with respect to the light output block; An optical transmission block having second lenses arranged on the light output side of each of the corresponding transmission elements; And An optical MUX block disposed in the housing and output from the transmission elements and multiplexing multiple wavelength optical signals passing through the second lenses to the optical output block. The optical transmission block is: A sub-mount having a sub-mount for mounting the transmitting elements toward the second lenses, a lead terminal connected to the electrical signal connector and mounted outside the sub-mount, and the second lenses And a lens cap for supporting the second lenses at a focal length between and the transmitting elements, and an alignment mark for aligning between the transmitting element and the second lens, And a plurality of optical transmitting sub-blocks, each of which is independently separated for each optical wavelength channel, including the transmitting element, the second lens, the sub-mount, the thim stem, the lens cap, and the alignment mark. The method of claim 1, The optical output block and the optical transmission block are coupled to the housing such that the first lens faces an edge located at either edge of the transmission elements; The optical mux block is: A second inclined surface that faces the optical output block toward the first lens toward the first lens and forms a first inclined surface that is inclined closer to the first lens, and a surface that faces the optical transmission block is inclined parallel to the first inclined surface With a transparent body to form, An anti-reflective layer formed on an area corresponding to the first lens and an entire area of the second inclined surface on the first inclined surface; A total reflection layer formed in an area other than a region in which the anti-reflective layer is formed on the first inclined surface, and And thin film filters disposed on the second inclined surface to selectively transmit only one optical signal and reflect optical signals of the remaining wavelengths in the optical signals of various wavelengths output from the transmitting devices. Multi-wavelength optical transmission module. 3. The method of claim 2, And said first and second lenses are collimating lenses. The method of claim 1, The optical mux block is a multi-wavelength optical transmission module, characterized in that the form of a PLC (Planar Light-wave Circuit). 5. The method of claim 4, And the first and second lenses are coupling lenses. delete delete delete The method of claim 1, The optical output block is a multi-wavelength optical transmission module, characterized in that connected to the optical signal connector in the form of a receptacle (receptacle) or optical fiber pigtail (pigtail). delete A housing having first and second coupling holes formed at both sides facing each other; An optical input block coupled to the housing corresponding to the first coupling hole and connected to an optical signal connector, the optical input block having a first lens therein; The light receiving unit is coupled to the housing in correspondence with the second coupling hole and connected to an electrical signal connector, and receives optical signals having different wavelengths, and includes a plurality of receiving elements arranged side by side with respect to the optical input block. block; And An optical DEMUX block disposed in the housing and input from the optical input block to demultiplex the multiplexed optical signals passing through the first lens to the receiving elements; The light receiving block is: Second lenses arranged on the optical input side of the receiving elements to correspond to the receiving elements, a sub-mount for mounting the receiving elements on the side facing the second lenses, and lead pins connected to the electrical signal connector. A TO stem provided on the outside of the sub-mount, a lens cap for supporting the second lenses at a focal length between the second lenses and the receivers, and the receiving element and the second It further includes an alignment mark for aligning between the lenses, And a plurality of optical receiving sub-blocks, each of which is independently separated for each optical wavelength channel, including the receiving element, the second lens, the sub-mount, the thim stem, the lens cap, and the alignment mark. 12. The method of claim 11, The light input block and the light receiving block are coupled to the housing such that the first lens faces one of the receivers; The optical demux block is: A second inclined surface that faces the light input block toward the first lens toward the first lens to form a first inclined surface that is inclined closer to the first lens, and a surface that faces the light receiving block inclines parallel to the first inclined surface With a transparent body to form, An anti-reflective layer formed on an area corresponding to the first lens and an entire area of the second inclined surface on the first inclined surface; A total reflection layer formed in an area other than a region in which the anti-reflective layer is formed on the first inclined surface, and And thin film filters disposed on the second inclined surface to selectively transmit only an optical signal of one wavelength among the optical signals of various wavelengths input through the optical input block and reflect the optical signal of the remaining wavelength. Multi-wavelength optical receiving module. The method of claim 12, And the first and second lenses are collimating lenses. 12. The method of claim 11, The optical demux block is a multi-wavelength light receiving module, characterized in that the form of a PLC (Planar Light-wave Circuit). The method of claim 14, And the first and second lenses are coupling lenses. delete delete delete 12. The method of claim 11, And the optical input block is connected to the optical signal connector in the form of a receptacle or an optical fiber pigtail. delete

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