KR101896698B1 - Method for packaging multi channel optical receiver module and package thereof - Google Patents

Method for packaging multi channel optical receiver module and package thereof Download PDF

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Publication number
KR101896698B1
KR101896698B1 KR1020150183554A KR20150183554A KR101896698B1 KR 101896698 B1 KR101896698 B1 KR 101896698B1 KR 1020150183554 A KR1020150183554 A KR 1020150183554A KR 20150183554 A KR20150183554 A KR 20150183554A KR 101896698 B1 KR101896698 B1 KR 101896698B1
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South Korea
Prior art keywords
lens
submount
optical block
optical
light source
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KR1020150183554A
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Korean (ko)
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KR20170052423A (en
Inventor
허영순
강현서
김거식
김정은
류지형
박형준
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한국전자통신연구원
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Priority to US15/096,171 priority Critical patent/US9857535B2/en
Publication of KR20170052423A publication Critical patent/KR20170052423A/en
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/42—Coupling light guides with opto-electronic elements
    • G02B6/4201—Packages, e.g. shape, construction, internal or external details
    • G02B6/4219—Mechanical fixtures for holding or positioning the elements relative to each other in the couplings; Alignment methods for the elements, e.g. measuring or observing methods especially used therefor
    • G02B6/422—Active alignment, i.e. moving the elements in response to the detected degree of coupling or position of the elements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/60—Receivers
    • H04B10/66—Non-coherent receivers, e.g. using direct detection
    • H04B10/67—Optical arrangements in the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0201—Add-and-drop multiplexing
    • H04J14/0215—Architecture aspects

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Light Receiving Elements (AREA)
  • Optical Couplings Of Light Guides (AREA)
  • Semiconductor Lasers (AREA)

Abstract

A method of packaging a multi-channel optical receiving module according to the present invention includes: mounting a first lens on a submount; Aligning an optical block comprising a plurality of filters on the submount; Mounting the aligned optical block on the submount; Aligning a second lens on the submount; Mounting the aligned second lens on the submount, and coupling the submount to the TO stem, the step of aligning the optical block further comprising the steps of: The position of the light source passed through the objective lens and the distance between the light sources are monitored through an IR camera so that the distance between the light sources transmitted through the plurality of filters becomes equal to each other, Align the optical block.

Description

[0001] METHOD FOR PACKAGING MULTI CHANNEL OPTICAL RECEIVER MODULE AND PACKAGE THEREOF [0002]

The present invention relates to a packaging method of a multi-channel optical receiving module and a package thereof.

High-quality, large-capacity data traffic is transmitted by wavelength division multiplexing (WDM) optical signals of different wavelengths to one optical fiber. This wavelength division multiplexing scheme is an optical multiplexing scheme that simultaneously transmits a plurality of wavelength bands. A plurality of transmission information can be transmitted through one optical fiber, and a transmission capacity of 40 G or more can be accommodated.

Meanwhile, the wavelength division multiplexing method can be classified into CWDM (Coarse WDM) and DWDM (Dense WDM). In this case, the CWDM has a wide wavelength interval of several tens of nanometers, has a wavelength of 4 to 8, and is inexpensive. And DWDM is mainly used for medium and long distance transmission with several nm wavelength interval.

This wavelength division multiplexing scheme has been mainly used in a backbone network, but is also applied to an access loop network and an Ethernet network.

In the case of Ethernet, a CWDM system with four wavelengths is used as a standard, and various methods for implementing a four-wavelength Transmitter Optical Sub-Assembly (TOSA) and a Receiver Optical Sub-Assembly (ROSA) Has been proposed. At this time, the TOSA performs the electro-optical conversion and the wavelength multiplexing function of four channels, and the ROSA performs the wavelength demultiplexing and the four-channel optical-to-optical conversion function.

In the case of such an optical transceiver for Ethernet, miniaturization and low power of the optical transceiver are required for power consumption and integration of the data center, and optical alignment, packaging, and reliability of the optical module incorporated in the optical transceiver are also important.

However, conventional techniques having various structures have difficulties in downsizing due to the nature of the structure, and in particular, there is a problem that a loss due to optical alignment becomes large. In addition, the conventional techniques have a disadvantage in that packaging is difficult and the mass productivity is greatly reduced.

In this regard, in US-A-2006-0088255 (entitled: Multi-wavelength optical transceiver subassembly module), when signals are incident on thin film filters arranged in a pentagon shape through a receptacle, And only the optical signal of the corresponding wavelength is transmitted and the optical signal of the remaining wavelength is reflected.

However, the above-mentioned prior art is difficult to miniaturize due to its structural characteristics, has a large loss due to optical alignment, and has a disadvantage that packaging is difficult, resulting in poor mass productivity.

Embodiments of the present invention can easily implement a multi-channel optical module by manually mounting a parallel optical lens on a separate submount and monitoring and aligning the optical block and focusing lens with the filter using an objective lens and an IR camera Channel optical receiving module, and a package thereof.

It should be understood, however, that the technical scope of the present invention is not limited to the above-described technical problems, and other technical problems may exist.

According to a first aspect of the present invention, there is provided a packaging method for a multi-channel optical receiving module, comprising: mounting a first lens on a submount; Aligning an optical block comprising a plurality of filters on the submount; Mounting the aligned optical block on the submount; Aligning a second lens on the submount; Mounting the aligned second lens on the submount, and coupling the submount to the TO stem. The step of aligning the optical block may include passing the light source that is incident through the first lens and transmitted through the plurality of filters through an objective lens and positions the light source through the objective lens and the distance between the light sources The optical block is monitored through an IR camera to align the optical blocks such that the light sources transmitted through the plurality of filters have the same interval.

A multi-channel light receiving module package according to a second aspect of the present invention includes a plurality of light sources having different wavelengths mounted on the base so that the intervals between the base and the light sources output through the second lens are equal to each other A plurality of light receiving elements for receiving light, a head portion formed on the base to be inserted into the submount, at least one lead pin passing through the base, and a multi- A plurality of filters coupled to the optical block and transmitting only a specific wavelength among the parallel lights guided and reflecting the remaining wavelengths; And a second lens arranged to correspond to each of the elements and focusing the light source transmitted by the filter The.

According to any one of the above-mentioned objects of the present invention, since the optical system and the light receiving element are separately packaged in the packaging step, if a problem occurs in one part, the entire module is not required to be discarded. Cost reduction possible

Also, when the submount and the TO stem are coupled, the holes formed in the submount are sealed with epoxy, and the alignment is not changed due to changes in the external environment such as temperature change.

1 is a flowchart of a packaging method of a multi-channel optical receiving module according to an embodiment of the present invention.
2 is a diagram illustrating a TO stem according to an embodiment of the present invention.
3 is a view illustrating a submount according to an embodiment of the present invention.
4 is a view showing submounts on which first and second lenses, an optical block and a filter are mounted.
5 is a view for explaining a method of aligning the first and second lenses.
6 is a side view of a light receiving module package according to an embodiment of the present invention.
7 is a plan view of a light receiving module package according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. It should be understood, however, that the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In the drawings, the same reference numerals are used throughout the specification to refer to the same or like parts.

Throughout this specification, when a part is referred to as being "connected" to another part, it is not limited to a case where it is "directly connected" but also includes the case where it is "electrically connected" do.

Throughout this specification, when a member is " on " another member, it includes not only when the member is in contact with the other member, but also when there is another member between the two members.

Throughout this specification, when an element is referred to as "including " an element, it is understood that the element may include other elements as well, without departing from the other elements unless specifically stated otherwise. The terms "about "," substantially ", etc. used to the extent that they are used throughout the specification are intended to be taken to mean the approximation of the manufacturing and material tolerances inherent in the stated sense, Accurate or absolute numbers are used to help prevent unauthorized exploitation by unauthorized intruders of the referenced disclosure. The word " step (or step) "or" step "used to the extent that it is used throughout the specification does not mean" step for.

The present invention relates to a packaging method of a multi-channel light receiving module and a package (1) thereof.

Hereinafter, a method for packaging a multi-channel optical receiving module according to an embodiment of the present invention will be described in detail with reference to FIGS. 1 to 5. FIG.

1 is a flowchart of a packaging method of a multi-channel optical receiving module according to an embodiment of the present invention. FIG. 2 is a view showing a TO stem 100 according to an embodiment of the present invention. 3 is a view illustrating a submount 200 according to an embodiment of the present invention. 4 is a view showing a submount 200 on which first and second lenses, an optical block 220 and filters 230a, 230b, 230c and 230d are mounted. 5 is a view for explaining a method of aligning the first and second lenses.

In the multi-channel optical receiving module packaging method according to an embodiment of the present invention, the first lens 210 is mounted on the submount 200 (S110). At this time, the first lens 210 may be mounted on the submount 200 using UV epoxy.

Referring to FIGS. 3 and 4, the submount 200 in one embodiment of the present invention may have one end face P1 in a plane and the other end face P2 in a round semicircular shape. A hole 201 is formed in one side surface P1 and the other side surface P2 of the submount 200 so as to penetrate one side surface P1 and the other side surface P2.

The first lens 210 is mounted on the submount 200 thus formed. At this time, the first lens 210 is positioned above the submount 200 so that the light source having four wavelengths can be received.

Next, a plurality of filters 230a, 230b, 230c, and 230d are mounted on one side of the optical block 220 using UV epoxies, and then an optical block 220 including a plurality of filters 230a, 230b, 230c, (220) on the submount (200) (S120). At this time, the other side of the optical block 220 is the total reflection coating 221 except for the size corresponding to the first lens 210.

The filters 230a, 230b, 230c and 230d may be attached to the optical block 220 to form a second lens (not shown) 240 on the submount 200 so as to be able to output a light source.

The optical block is made incident on the objective lens 300 through the first lens 210 and passes through the plurality of filters 230a, 230b, 230c and 230d through the objective lens 300, The position of the light source and the spacing between the light sources are monitored through the IR camera 400 to align the optical blocks 220 such that the spacing between the light sources transmitted through the plurality of filters 230a, 230b, 230c, and 230d is the same.

4 and 5, after the first lens 210 is mounted on the submount 200, the light source passing through the first lens 210 is aligned to be incident on the optical block 220. The light source having passed through the plurality of filters 230a, 230b, 230c, and 230d is passed through the objective lens 300. [

Then, the position of the light source passed through the objective lens 300 and the interval between the light sources are monitored through the IR camera 400 so that the interval between the light sources transmitted through the plurality of filters 230a, 230b, 230c and 230d is Align the optical block 220 to be the same.

At this time, by monitoring through the IR camera 400, the distance between the light sources transmitted through the plurality of filters 230a, 230b, 230c and 230d is equal to (S 1 = S 2 = S 3 ) ).

That is, the optical block 220 is aligned so that the intervals between the light sources monitored through the IR camera 400 are equal to each other (S 1 = S 2 = S 3 ), so that the plurality of filters 230a, 230b, 230c, (P 1 = P 2 = P 3 ) are equal to each other.

Next, the aligned optical block 220 is mounted on the submount 200 (S130).

At this time, the optical block 220 may be mounted on the submount 200 using UV epoxies.

After the optical block 220 is mounted on the submount 200, the second lens 240 configured in an array form is aligned on the submount 200 (S140).

At this time, the second lens 240 is positioned below the submount 200 so that the light source is optically coupled to the optical receiving elements 120a, 120b, 120c, and 120d to maximize optical coupling, and the optical block 220 and the filters 230a, 230b, 230c, and 230d.

The second lens 240 is aligned using the alignment jig such that the light sources transmitted through the plurality of filters 230a, 230b, 230c, and 230d are incident on the center of the second lens 240. [ At this time, in order to confirm that each light source transmitted through the plurality of filters 230a, 230b, 230c and 230d is incident on the center of the second lens 240, as in the case of aligning the optical block 220, 300 and the IR camera 400 may be used.

Next, the second lens 240 aligned in this way is mounted on the submount 200 (S140). At this time, the second lens 240 may be mounted on the submount 200 using UV epoxy in the same manner as the first lens 210.

Meanwhile, in an embodiment of the present invention, the first lens 210 may be a collimating lens, and the second lens 240 may be a coupling lens.

Next, the sub-mount 200 mounted with the optical block 220, the first lens 210, and the second lens 240 is coupled to the TO stem 100 (S150).

The TO stem 100 includes a head portion 130 formed to correspond to the hole 201 of the submount 200. The hole 201 is formed in the submount 200, . The TO stem 100 and the sub mount 200 can be coupled by inserting the head part 130 of the TO stem 100 into the hole 201 of the sub mount 200

At this time, the hole 201 of the sub mount 200 in which the head part 130 of the TO stem 100 is inserted can be sealed with epoxy without any gap. That is, the sub-mount 200 having the hole 201 is fitted into the head part 130 of the TO stem 100, and the light source is incident on the first lens 210 to form the light receiving elements 120a, 120b and 120c And 120d are maximized so that the optical coupling efficiency is maximized. Then, the hole 201 is completely filled with the epoxy, and the alignment does not become irregular even if the external environment changes such as the temperature.

Hereinafter, a multi-channel optical receiving module package 1 according to an embodiment of the present invention will be described with reference to FIGS. 6 to 7. FIG.

6 is a side view of a light receiving module package 1 according to an embodiment of the present invention. 7 is a plan view of a light receiving module package 1 according to an embodiment of the present invention.

A light receiving module package 1 according to an embodiment of the present invention includes a TO stem 100 and a submount 200.

The TO stem 100 includes a base 110, a plurality of light receiving elements 120a, 120b, 120c and 120d, a head part 130 and a lead pin 140. [

The base 110 is formed to include the light receiving elements 120a, 120b, 120c and 120d, the head part 130 and the lead pin 140. In one embodiment, It can be circular.

The plurality of light receiving elements 120a, 120b, 120c, and 120d receive the light sources output through the second lens 240, and the light sources output through the second lens 240 are spaced from each other (110). The plurality of light receiving elements 120a, 120b, 120c, and 120d receive light sources of different wavelengths.

In this case, the light receiving elements 120a, 120b, 120c and 120d may be arranged to have the same wavelength as that of the light sources incident on the first lens 210. For example, four wavelengths λ 1 , λ 2 , 3 , and? 4 are incident, four light receiving elements 120a, 120b, 120c, and 120d may be provided.

The optical receiving elements 120a, 120b, 120c, and 120d may receive optical signals having different wavelengths. Meanwhile, the light receiving elements 120a, 120b, 120c and 120d may be composed of photodiodes receiving optical signals having different wavelengths (? 1 ,? 2 ,? 3 ,? 4 ) .

The head portion 130 is formed on the base 110 so as to be inserted into the submount 200 to be coupled thereto.

At this time, the head part 130 may be formed to correspond to the shape of the hole 201 so as to be inserted into the hole 201 formed in the submount 200. For example, the shape of the hole 201 and the head portion 130 may be elliptical.

The lead pin 140 is formed to penetrate the base 110 in a direction opposite to the head part 130 and is connected to the light receiving elements 120a and 120b to apply power to the light receiving elements 120a, 120b, 120c and 120d. , 120c, and 120d, and the lead pin 140 may be wire-bonded.

The submount 200 includes a first lens 210, an optical block 220, a plurality of filters 230a, 230b, 230c, and 230d, and a second lens 240 configured in an array form.

The first lens 210 transmits the incident multi-wavelength light source as parallel light. Here, the first lens 210 may be a collimating lens in an embodiment of the present invention.

The optical block 220 guides parallel light.

The optical block 220 includes a transparent body, an anti-reflection layer, and a total reflection layer 221. More specifically, the total reflection layer 221 includes a plurality of filters 230a, 230b, 230c, and 230d except for the corresponding size of the first lens 210 on the other side opposite to one side of the optical block 220 And may be coated on the remaining portion.

The total reflection layer 221 thus formed totally reflects the light source reflected by the first filter among the plurality of filters 230a, 230b, 230c and 230d to the second filter.

Accordingly, the second filter transmits only a specific wavelength of the total reflected light, and the light source having the remaining wavelength is reflected to the total reflection layer 221 of the optical block 220.

The plurality of filters 230a, 230b, 230c and 230d transmit only a specific wavelength of the parallel light guided by the optical block 220 and reflect the remaining wavelengths. To this end, the plurality of filters 230a, 230b, 230c and 230d have a certain incident angle, and the light source transmitted through the filters 230a, 230b, 230c and 230d is incident on the second lens 240.

For example, the first filter (230a) is a light source of wavelength (λ 1, λ 2, λ 3, λ 4) of and transmit only the light source corresponding to the first wavelength (λ 1), the remaining wavelengths (λ 2, ? 3 ,? 4 ) can be reflected. The second filter 230b may transmit only the light source corresponding to the second wavelength λ 2 of the total light source and reflect the light sources corresponding to the remaining wavelengths λ 3 and λ 4 .

The second lens 240 is configured in an array shape to focus the light source transmitted by the filters 230a, 230b, 230c, and 230d. That is, each light source having different wavelengths (λ 1 , λ 2 , λ 3 , λ 4 ) transmitted by the filters 230a, 230b, 230c, and 230d can be received and focused. In this case, the second lens 240 in the embodiment of the present invention may be a coupling lens.

The sub-mount 200 having the above-described configurations may have one end surface formed in a plane and the other end surface formed in a round semicircle. A hole 201 may be formed on one side surface and the other side surface of the submount 200 so as to pass through one side surface and the other side surface.

Also, the shape of the head part 130 formed on the TO stem 100 may be formed in an elliptical shape like the hole 201. Accordingly, as the head portion 130 is inserted into the hole 201 and the hole 201 is sealed with epoxy, the submount 200 and the TO stem 100 can be coupled with each other.

In addition, the shape of the hole 201 of the submount 200 and the shape of the head 130 coupled thereto are not necessarily limited thereto, and may be formed in various shapes such as a triangle or a quadrangle have.

In the above description, steps S110 to S150 may be further divided into additional steps or combined into fewer steps, according to an embodiment of the present invention. Also, some of the steps may be omitted as necessary, and the order between the steps may be changed. In addition, the contents already described with respect to the multi-channel light receiving module package 1 in FIGS. 6 to 7 are also applied to the multi-channel light receiving module packaging method of FIG. 1 to FIG. 5, even if other contents are omitted.

According to the embodiment of the present invention, since the optical system and the light receiving elements 120a, 120b, 120c, and 120d are separately packaged in the packaging process, if a problem occurs in any one part, It is possible to reduce manufacturing cost of receiving module

In addition, when the sub mount 200 is coupled with the TO stem 100, the hole 201 formed in the sub mount 200 is sealed with epoxy, and alignment is not changed due to external environmental change such as temperature change .

It will be understood by those skilled in the art that the foregoing description of the present invention is for illustrative purposes only and that those of ordinary skill in the art can readily understand that various changes and modifications may be made without departing from the spirit or essential characteristics of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

1: Multi-channel optical reception module package 100: TO stem
110: bases 120a to 120d: optical receiving element
130: head part 140: lead pin
200: Sub mount 201: Hole
210: first lens 220: optical block
221: total reflection layers 230a to 230d: filter
240: second lens 300: objective lens
400: IR camera

Claims (9)

A method of packaging a multi-channel light receiving module,
Mounting a first lens on a submount;
Aligning an optical block comprising a plurality of filters on the submount;
Mounting the aligned optical block on the submount;
Aligning a second lens on the submount;
Mounting the aligned second lens on the submount, and
Coupling the submount to the TO stem,
Wherein one end face of the submount is flat and the other end face is a round semicircular shape,
And a hole penetrating through the one side surface and the other side surface is formed on one side surface and the other side surface of the submount,
Wherein aligning the optical block comprises:
A light source that is incident through the first lens and is transmitted through the plurality of filters is passed through an objective lens, a position of the light source passed through the objective lens and an interval between the light sources are monitored through an IR camera, Wherein the optical blocks are aligned such that the spacing between the light sources transmitted through the optical block is equal to each other. The method according to claim 1,
Wherein the step of aligning the second lens comprises:
And the second lens is aligned such that each light source that has transmitted the plurality of filters is incident on the center of the second lens. The method according to claim 1,
Mounting the optical block on a submount, and mounting the first lens and the second lens on the submount,
Wherein the optical block, the first lens, and the second lens are mounted on the submount using epoxy. The method according to claim 1,
Wherein coupling the submount to the TO stem comprises:
Inserting a head portion of the TO stem into a hole passing through one side surface and the other side surface of the submount;
And sealing the hole of the submount into which the head portion of the TO stem is inserted with epoxy. In a multi-channel light receiving module package,
A plurality of light receiving elements mounted on the base for receiving light sources of different wavelengths so that the intervals between the light sources output through the first lens and the light source output through the second lens are equal to each other; A TO stem including at least one lead pin passing through the base,
A first lens that transmits the incident multi-wavelength light source as parallel light; an optical block that guides the parallel light; and a plurality of optical elements that are coupled to the optical block and transmit only a specific wavelength of the guided parallel light, And a second lens arranged to correspond to each of the plurality of light receiving elements and focusing a light source transmitted by the filter,
One end face of the submount is flat, the other end face is round semicircular,
And a hole penetrating the one side surface and the other side surface is formed on one side surface and the other side surface of the submount. 6. The method of claim 5,
Wherein the first lens is a collimating lens, and the second lens is a coupling lens. delete 6. The method of claim 5,
Wherein the shape of the hole and the head portion are elliptical,
And the head portion is inserted into and coupled to the hole. 6. The method of claim 5,
Wherein the optical block includes a transparent body, an anti-reflection layer, and a total reflection layer,
Wherein the total reflection layer totally reflects the light source reflected by the first filter among the plurality of filters to the second filter.
KR1020150183554A 2015-11-03 2015-12-22 Method for packaging multi channel optical receiver module and package thereof KR101896698B1 (en)

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Application Number Priority Date Filing Date Title
US15/096,171 US9857535B2 (en) 2015-11-03 2016-04-11 Method of packaging multichannel optical receiver module having a sub-mount with an optical block to guide incident parallel light beams and package of the same

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KR1020150153970 2015-11-03
KR20150153970 2015-11-03

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US20060088255A1 (en) * 2004-10-22 2006-04-27 Enboa Wu Multi-wavelength optical transceiver subassembly module
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