WO2004068206A1 - 光導波路および光送受信モジュール - Google Patents
光導波路および光送受信モジュール Download PDFInfo
- Publication number
- WO2004068206A1 WO2004068206A1 PCT/JP2004/000799 JP2004000799W WO2004068206A1 WO 2004068206 A1 WO2004068206 A1 WO 2004068206A1 JP 2004000799 W JP2004000799 W JP 2004000799W WO 2004068206 A1 WO2004068206 A1 WO 2004068206A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- waveguide
- optical
- light
- coupled
- guided
- Prior art date
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Classifications
-
- 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
- G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
- G02B6/12—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind
-
- 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
- G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
- G02B6/12—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind
- G02B6/122—Basic optical elements, e.g. light-guiding paths
- G02B6/125—Bends, branchings or intersections
-
- 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
- G02B6/26—Optical coupling means
- G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
- G02B6/2804—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals forming multipart couplers without wavelength selective elements, e.g. "T" couplers, star couplers
-
- 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
-
- 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
- G02B6/4246—Bidirectionally operating package structures
Definitions
- the present invention relates to an optical waveguide and an optical transceiver module, and more particularly to an optical waveguide for connecting an optical fiber and an optical element and an optical transceiver module including the optical waveguide.
- the signal light sent from the optical fiber is divided by the Y-branch waveguide and transmitted to each of the light-receiving element and the light-emitting element.
- No. 349 Japanese Unexamined Patent Application Publication No. 2002-6969).
- optical transmission / reception module configured to transmit signal light received from an optical fiber only to a light receiving element via a wavelength selection filter (see Japanese Patent Application Publication No. 2001-133642).
- a Y-branch waveguide is used in the optical transmitting and receiving module described in Japanese Patent Application Laid-Open Publication No. 2000-200834 and Japanese Patent Publication No. 2002-169043.
- the incoming signal light is guided to each of the two branch waveguides at a ratio of 1: 1. Therefore, when receiving the signal light, the received signal light is also guided to the light emitting element. And cannot transmit signal light at the same time.
- the present invention has been made in view of the above circumstances, and an object of the present invention is to provide an optical waveguide and an optical transmission / reception module capable of performing simultaneous transmission and reception without using other optical components. To provide.
- an optical waveguide comprises a first waveguide that extends in a straight line and that can guide signal light in two directions, one end serving as a common transmission / reception port and the other end serving as a reception port. Branching from the second waveguide so as to form an acute angle with respect to the reception port, and having one end coupled to the first waveguide and the other end serving as a transmission port, toward the first waveguide.
- a second waveguide for guiding the signal light is
- the signal light incident from the common transmission / reception port is guided by the first waveguide and reaches the reception port.
- the first waveguide extends linearly, most of the signal light incident from the common transmission / reception port reaches the reception port without being guided to the second waveguide. Therefore, even when the signal light is input from the common transmission / reception port, it is edible to input the signal light from the transmission port of the second waveguide.
- the second waveguide is branched from the first waveguide so as to be at an acute angle with respect to the receiving port, light is not guided to the receiving port side, but is guided by the second waveguide. Most of the signal light is guided to the common transmission / reception port of the first waveguide.
- the optical transmitting and receiving module of the present invention comprises: A light transmitting / receiving module in which a light emitting element and a light receiving element are coupled via an optical waveguide, one end of which is coupled to the optical fiber and the other end of which is coupled to the light receiving element.
- a first waveguide extending linearly, and branching from the first waveguide at an acute angle with respect to the other end of the first waveguide, and one end is coupled to the first waveguide. And the other end has a second waveguide coupled to the light emitting element.
- the signal light from the optical fiber enters the second waveguide
- the signal light is guided by the first waveguide and received by the light receiving element.
- the first waveguide extends linearly, most of the signal light incident from the optical fiber is received by the light receiving element without being guided to the second waveguide. Therefore, even when the signal light is incident from the optical fiber, the signal light from the light emitting element can be incident on the second waveguide.
- the signal light from the light emitting element When the signal light from the light emitting element is incident on the second waveguide, the signal light is guided toward the first waveguide by the second waveguide and is coupled to the second waveguide. The light is guided toward the optical fiber.
- the second waveguide branches off from the first waveguide at an acute angle to the other end of the first waveguide, the light receiving portion coupled to the other end of the first waveguide is formed.
- the signal light is not guided to the element, and most of the signal light guided by the second waveguide is guided to the optical fiber side of the first waveguide.
- Figure 1 is a plan view showing an example of a configuration of an optical transceiver module including an optical waveguide according to the present embodiment e
- FIG. 2 is a cross-sectional view taken along line AA ′ of the optical waveguide shown in FIG.
- FIG. 3A is a diagram showing a waveguide shape
- FIG. 3B is a diagram showing a simulation result of an intensity pattern of a guided light at the time of receiving operation by the optical waveguide shown in FIG. 3A
- FIG. 4A is a diagram showing a waveguide shape
- FIG. 4B is a diagram showing a simulation result of an intensity pattern of guided light at the time of transmitting operation by the optical waveguide shown in FIG. 4A.
- FIG. 1 is a plan view showing an example of the configuration of an optical transceiver module including an optical waveguide according to the present embodiment.
- FIG. 2 is a cross-sectional view taken along line AA ′ of the optical waveguide shown in FIG.
- the optical transmitting and receiving module according to the present embodiment shown in FIG. 1 includes an optical waveguide 2 formed on a substrate 1 made of a silicon substrate, a sapphire substrate or the like, an optical fiber 3, a light receiving element 4, and an optical fiber 3 mounted on the substrate.
- the optical waveguide 2 has a first waveguide core portion (first waveguide) 21 extending linearly, and a second waveguide core having one end coupled to the first waveguide core portion 21 at an angle ⁇ . (A second waveguide) 22.
- first waveguide first waveguide
- second waveguide second waveguide
- each of the waveguide cores 21 and 22 is formed on a clad 20 formed on the substrate 1.
- a cladding part 23 is formed so as to cover each of the waveguide core parts 21 and 22.
- One end of the first waveguide core part 2 # constitutes the common transmission / reception port 21a, and the other end constitutes the reception port 21b, and guides the signal light in both directions.
- the second waveguide core 21 is preferably a multi-mode waveguide, for example, formed to have a diameter of 5O ⁇ m.
- the reason Ho the second signal light guided from the waveguide core portion 2 2 branching obliquely to the waveguide to a common transmission port 2 1 a bond to a low loss has a diameter greater This is because it is preferable to use a multimode waveguide in which light can easily enter.
- a multi-mode waveguide is defined as a waveguide that has dimensions that can guide multiple modes (the way light rays pass) of signal light.
- the second waveguide core part 22 forms a branch part 22 a by being coupled at one end to the first waveguide core part 21 on the reception port 21 b side at an angle ⁇ . Constitute the transmission port 22b.
- the angle and dimensions of the second waveguide core 22, which is obliquely branched with respect to the first waveguide core 21, are such that the signal light guided from the optical fiber 3 is the second waveguide core 2.
- the angle 0 is required to be an acute angle, and is preferably 5 ° or more and 60 ° or less.
- most of the signal light guided from the common transmission / reception port 21 a of the first waveguide core 21 is converted to the linear first waveguide core 21.
- the light is guided inside to the reception port 21b.
- the signal light guided from the transmission port 22b is coupled to the first waveguide core 21 with low loss and guided, and guided to the common transmission / reception port 21a.
- the dimension of the branch portion 22 a of the second waveguide core portion 22, that is, the width or the thickness of the waveguide be smaller than that of the linear second waveguide core portion 21. .
- the first waveguide core section 21 and the second waveguide core section 22 are further connected so that light is not scattered. Has a gentle curved shape.
- Each of the waveguide cores 21 and 22 is made of a material that does not absorb light to be used and has a higher oscillating ratio for light to be used than the claddings 20 and 23.
- the waveguide cores 21 and 22 are formed of a high molecular material such as an epoxy resin or a fluorinated polyimide, and the refractive index is adjusted by adding impurities to these.
- the cladding sections 20 and 23 have no absorption for the light used and have a waveguide core section. It is formed of a material having a lower refractive index to light used than 2 1 and 2 2.
- the cladding portions 20 and 23 are formed of a polymer material such as an epoxy resin or a fluorinated polyimide, and the refractive index is adjusted by adding an impurity to these.
- the cladding portions 20 and 23 and the waveguide core portions 21 and 22 may be made of the same material or different materials.
- the optical fiber 3 is mounted on the substrate 1 with the end face of the optical fiber 3 optically coupled to the common transmission / reception port 21 a of the first waveguide core 21.
- the optical fiber 3 may be either a multimode fiber or a single mode fiber.
- the light receiving element 4 is mounted on the substrate 1 with the light receiving surface of the light receiving element 4 optically coupled to the reception port 21 b of the first waveguide core 21.
- the light receiving element 4 is made of, for example, a photo diode.
- the light emitting element 5 is mounted on the substrate 1 with the light emitting surface of the light emitting element 5 optically coupled to the transmission port 22 b of the second waveguide core 22.
- a semiconductor laser such as a Fabry-Perot laser (FP-LD) or a distributed laser (DFB-: LD) can be used.
- FP-LD Fabry-Perot laser
- DFB-: LD distributed laser
- the received signal light incident from the optical fiber 3 is guided by the first waveguide core 21 from the common transmission / reception port 1 a to the reception port 21 b of the second waveguide core 21 and received.
- Light is received by the element 4.
- the signal light is converted into an electric signal by the photodetector 4 and input to a receiving circuit (not shown) connected to the photodetector 4.
- the received signal light guided by the first waveguide core portion 21 is not guided to the second waveguide core portion 22 and the light emitting element 5, so that the light emitting element
- the transmission signal light can be transmitted by the slave 5.
- the transmission signal light emitted by the light emitting element 5 is From the transmission port 22 b to the branch part 22 a, the light is guided by the second waveguide core part 22, coupled to the first waveguide core part 2 ⁇ , and becomes the first waveguide core part 21.
- the light is guided to the common transmission / reception port 21 a and coupled to the optical fiber 3. Since the second waveguide core 22 branches off from the first waveguide core 21 at an acute angle ⁇ ⁇ ⁇ with respect to the reception port 21 b, the transmission signal light is transmitted to the light receiving element 4. No light is guided to the side, and the light receiving operation to the light receiving element 4 is not affected.
- the transmission signal light coupled to the optical fiber 3 is guided by the optical fiber 3 and sent to an external optoelectronic circuit device. Note that the wavelengths of the above-mentioned reception signal light and transmission signal light may be changed.
- a polymer material such as epoxy resin or fluorinated polyimide is applied to the entire surface of the substrate 1 to form the cladding part 20, and then a polymer material such as epoxy resin or fluorinated polyimide is further applied to the entire surface. Coating is performed to form a high-refractive-index layer serving as a core. The refractive index difference between the cladding part 20 and the high refractive index layer is adjusted by including impurities.
- a resist having a desired pattern is formed on the high-refractive-index layer by photolithography, and reactive ion etching of the high-refractive-index layer is performed using the resist as a mask, thereby obtaining a shape as shown in FIG.
- the first waveguide core portion 21 and the second waveguide core portion 22 are patterned.
- a polymer material such as epoxy resin or fluorinated polyimide is applied to the entire surface so as to cover the waveguide core portions 21 and 22 to form a cladding portion 23.
- a polymer material such as epoxy resin or fluorinated polyimide is applied to the entire surface so as to cover the waveguide core portions 21 and 22 to form a cladding portion 23.
- an optical waveguide 2 having waveguide core portions 21 and 22 embedded in cladding portions 20 and 23 is formed on a substrate.
- the optical fiber 3 is mounted on the substrate 1 so that the end face of the optical fiber 3 is optically coupled to the common transmission / reception port 21a of the second waveguide core 2 #.
- the light receiving element 4 is mounted on the substrate 1 so that the light receiving surface of the light receiving element 4 is optically coupled to the reception port 2 lb of the first waveguide core 21.
- the light emitting element 5 is mounted on the substrate 1 so that the light emitting surface of the light emitting element 5 is optically coupled to the transmission port 22 b of the second waveguide core 22.
- FIG. 3A is a diagram showing a waveguide shape
- FIG. 3B is a diagram showing a simulation result of an intensity pattern of guided light at the time of receiving operation by the optical waveguide shown in FIG. 3A.
- the linear first waveguide core 21 has a length of 7 mm, the reception port 21 b of the first waveguide core 21, and the second waveguide core 21.
- the optical waveguide in which the interval between 22 transmission ports 22b is 250 was simulated.
- the waveguide cores 21 and 22 have a 50 / urn angle, and the refractive index difference from the cladding is 1.5%.
- the X coordinate and the Z coordinate indicate vertical coordinates obtained by dividing the shape of the optical waveguide in units of am.
- the received signal light is guided to the receiving port 21 b of the first waveguide core unit 21, and the received signal light becomes 0%. 0.015% is guided to the transmission port 22 b of the second waveguide core part 22, and the received signal light travels substantially straight through the linear first waveguide core part 21. Therefore, the received signal light incident on the first waveguide core 21 is guided to the receiving port 21 b with a low loss of 0.10 dB which is less than ⁇ . It can be seen that the intensity of the signal light guided to the second waveguide core part 22 is about 28 dB, and that it is hardly guided.
- FIG. 4A is a diagram showing the shape of a long wave path
- FIG. 4B is a diagram showing a simulation result of an intensity pattern of guided light at the time of transmitting operation by the optical waveguide shown in FIG. 4A.
- the optical waveguide shown in FIG. 4A is the same as that shown in FIG. 3A.
- the X coordinate and the Z coordinate are obtained by dividing the shape of the optical waveguide in units of m. Indicates the position coordinates divided.
- the transmission signal light from the second waveguide core unit 22 is coupled to the first waveguide A unit 2 ⁇ and the common transmission / reception port 2 It is guided to 1a. Therefore, the transmission signal light from the second waveguide core portion 22 is guided to the first waveguide core portion 21 with a low loss of 0.57 dB which is equal to or less than 1.0 dB. You can see that.
- simultaneous bidirectional transmission and reception using one optical fiber can be realized without using optical components such as a wavelength selection filter. can do.
- the respective waveguide core portions 21 and 22 of the optical waveguide can be formed collectively by using patterning or the like as described above, and there is no need for a groove for inserting an optical component such as a wavelength selection filter.
- a low-loss optical waveguide can be manufactured with good yield. This is because, when an optical component such as a wavelength selection filter is inserted, there are many factors that deteriorate characteristics such as light scattering loss and reliability of the adhesive strength.
- the present invention is not limited to the above embodiments.
- the material constituting the substrate 1, the cladding portions 20 and 23 constituting the optical waveguide 2 and the waveguide core portions 21 and 22 is not particularly limited, and the optical fiber 3 is constituted.
- the material is not particularly limited.
- the present invention can be applied to an optical waveguide and an optical transmission / reception module of the present invention, for example, an optical access system.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Optical Integrated Circuits (AREA)
- Optical Couplings Of Light Guides (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP04706289A EP1589359A4 (en) | 2003-01-30 | 2004-01-29 | OPTICAL WAVEGUIDE AND OPTICAL TRANSMITTING / RECEIVING MODULE |
US10/541,088 US7260295B2 (en) | 2003-01-30 | 2004-01-29 | Optical waveguide and optical transmitting/receiving module |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003021490A JP2004264339A (ja) | 2003-01-30 | 2003-01-30 | 光導波路および光送受信モジュール |
JP2003-021490 | 2003-01-30 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004068206A1 true WO2004068206A1 (ja) | 2004-08-12 |
Family
ID=32820660
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2004/000799 WO2004068206A1 (ja) | 2003-01-30 | 2004-01-29 | 光導波路および光送受信モジュール |
Country Status (6)
Country | Link |
---|---|
US (1) | US7260295B2 (ja) |
EP (1) | EP1589359A4 (ja) |
JP (1) | JP2004264339A (ja) |
KR (1) | KR20050090013A (ja) |
TW (1) | TWI236554B (ja) |
WO (1) | WO2004068206A1 (ja) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8463083B2 (en) | 2009-01-30 | 2013-06-11 | Claudio Oliveira Egalon | Side illuminated multi point multi parameter optical fiber sensor |
KR101248131B1 (ko) * | 2011-01-17 | 2013-03-28 | 부산대학교 산학협력단 | 광 트랜시버용 대구경 플랫폼 구조 |
CN103994783B (zh) * | 2014-05-23 | 2016-07-06 | 华中科技大学 | 一种基于集成光波导耦合器的波长解调装置 |
JP7192270B2 (ja) * | 2018-06-29 | 2022-12-20 | 住友ベークライト株式会社 | 光導波路、光モジュールおよび電子機器 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62291604A (ja) * | 1986-06-11 | 1987-12-18 | Sumitomo Electric Ind Ltd | 光分岐結合器 |
EP0338864A2 (en) * | 1988-04-22 | 1989-10-25 | Sony Corporation | Magneto-optical playback heads |
JPH11183743A (ja) * | 1997-12-19 | 1999-07-09 | Hitachi Ltd | 光分岐結合器及びそれを用いた光伝送装置 |
JPH11271548A (ja) * | 1998-03-26 | 1999-10-08 | Sharp Corp | 双方向光通信器および双方向光通信装置 |
US20020154879A1 (en) * | 2001-04-23 | 2002-10-24 | Naru Yasuda | Optical device, and optical transceiver and other optical apparatuses using the optical device |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59216106A (ja) * | 1983-05-24 | 1984-12-06 | Nippon Telegr & Teleph Corp <Ntt> | 石英系光導波路およびその製造方法 |
JPH0291831A (ja) | 1988-09-28 | 1990-03-30 | Sony Corp | 光再生ピックアップ |
JP2629812B2 (ja) | 1988-04-25 | 1997-07-16 | ソニー株式会社 | 光再生ピックアップ |
EP0598966B1 (en) * | 1992-11-24 | 1999-02-10 | International Business Machines Corporation | Optical waveguide isolator |
JP2000206349A (ja) | 1999-01-13 | 2000-07-28 | Nec Corp | 光モジュ―ル |
JP2001133642A (ja) | 1999-11-01 | 2001-05-18 | Nec Corp | 光導波路及び光送受信モジュール並びに光導波路製造方法 |
JP2002169043A (ja) | 2000-12-01 | 2002-06-14 | Nec Corp | 光モジュール |
-
2003
- 2003-01-30 JP JP2003021490A patent/JP2004264339A/ja active Pending
-
2004
- 2004-01-29 US US10/541,088 patent/US7260295B2/en not_active Expired - Fee Related
- 2004-01-29 KR KR1020057014003A patent/KR20050090013A/ko not_active Application Discontinuation
- 2004-01-29 EP EP04706289A patent/EP1589359A4/en not_active Withdrawn
- 2004-01-29 WO PCT/JP2004/000799 patent/WO2004068206A1/ja not_active Application Discontinuation
- 2004-01-30 TW TW093102174A patent/TWI236554B/zh not_active IP Right Cessation
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62291604A (ja) * | 1986-06-11 | 1987-12-18 | Sumitomo Electric Ind Ltd | 光分岐結合器 |
EP0338864A2 (en) * | 1988-04-22 | 1989-10-25 | Sony Corporation | Magneto-optical playback heads |
JPH11183743A (ja) * | 1997-12-19 | 1999-07-09 | Hitachi Ltd | 光分岐結合器及びそれを用いた光伝送装置 |
JPH11271548A (ja) * | 1998-03-26 | 1999-10-08 | Sharp Corp | 双方向光通信器および双方向光通信装置 |
US20020154879A1 (en) * | 2001-04-23 | 2002-10-24 | Naru Yasuda | Optical device, and optical transceiver and other optical apparatuses using the optical device |
Non-Patent Citations (1)
Title |
---|
See also references of EP1589359A4 * |
Also Published As
Publication number | Publication date |
---|---|
TWI236554B (en) | 2005-07-21 |
KR20050090013A (ko) | 2005-09-09 |
TW200424581A (en) | 2004-11-16 |
EP1589359A1 (en) | 2005-10-26 |
JP2004264339A (ja) | 2004-09-24 |
EP1589359A4 (en) | 2007-11-14 |
US7260295B2 (en) | 2007-08-21 |
US20060093267A1 (en) | 2006-05-04 |
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