WO2005096052A1 - 光波回路モジュール - Google Patents
光波回路モジュール Download PDFInfo
- Publication number
- WO2005096052A1 WO2005096052A1 PCT/JP2005/005906 JP2005005906W WO2005096052A1 WO 2005096052 A1 WO2005096052 A1 WO 2005096052A1 JP 2005005906 W JP2005005906 W JP 2005005906W WO 2005096052 A1 WO2005096052 A1 WO 2005096052A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- waveguide
- pitch
- optical
- optical fiber
- circuit module
- Prior art date
Links
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
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4202—Packages, e.g. shape, construction, internal or external details for coupling an active element with fibres without intermediate optical elements, e.g. fibres with plane ends, fibres with shaped ends, bundles
-
- 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
- G02B6/36—Mechanical coupling means
- G02B6/3628—Mechanical coupling means for mounting fibres to supporting carriers
- G02B6/368—Mechanical coupling means for mounting fibres to supporting carriers with pitch conversion between input and output plane, e.g. for increasing packing density
-
- 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
- G02B6/4249—Packages, e.g. shape, construction, internal or external details comprising arrays of active devices and fibres
-
- 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
- G02B6/36—Mechanical coupling means
- G02B6/3628—Mechanical coupling means for mounting fibres to supporting carriers
- G02B6/3648—Supporting carriers of a microbench type, i.e. with micromachined additional mechanical structures
- G02B6/3652—Supporting carriers of a microbench type, i.e. with micromachined additional mechanical structures the additional structures being prepositioning mounting areas, allowing only movement in one dimension, e.g. grooves, trenches or vias in the microbench surface, i.e. self aligning supporting carriers
-
- 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
- G02B6/36—Mechanical coupling means
- G02B6/3628—Mechanical coupling means for mounting fibres to supporting carriers
- G02B6/3684—Mechanical coupling means for mounting fibres to supporting carriers characterised by the manufacturing process of surface profiling of the supporting carrier
- G02B6/3692—Mechanical coupling means for mounting fibres to supporting carriers characterised by the manufacturing process of surface profiling of the supporting carrier with surface micromachining involving etching, e.g. wet or dry etching steps
Definitions
- the present invention relates to a lightwave circuit module that can directly and optically couple an optical element and a waveguide array with low loss.
- Wavelength division multiplexing is a high-speed, large-capacity communication system that can process a huge amount of data by rapidly increasing this traffic volume and transmitting multiple lights with different wavelengths to one optical fiber.
- Communication systems have been put into practical use, and even now, research and development are being carried out around the world to reduce the cost of communication systems and achieve high reliability. Further, in the future, all-optical switches for sensing the increase and decrease of optical signals and instantaneously switching a plurality of signal paths are being studied energetically.
- an arrayed waveguide grating (AWG) type (N X N) optical wavelength multiplexer / demultiplexer is widely used as a key device.
- the AWG type optical wavelength multiplexer / demultiplexer can perform high-performance processing by combining light of multiple wavelengths on the transmitting side or demultiplexing multiple lights in the optical fiber to different ports on the receiving side. is there.
- FIG. 5 An example of a lightwave circuit module using such an AWG type optical wavelength multiplexer / demultiplexer is shown in FIG. 5 (for example, see Patent Document 1).
- Patent Document 1 Japanese Patent Laid-Open No. 2002-277675 (Page 4, FIG. 3)
- AWG-type optical wavelength multiplexer / demultiplexer board 101 hereinafter referred to as AWG-type optical wavelength multiplexer / demultiplexer or simply AWG type optical wavelength multiplexer / demultiplexer as required
- An output waveguide group 101a having a structure (tapered waveguide) is provided.
- a spot size conversion function structure (tapered waveguide) is provided on the pitch conversion waveguide substrate 102.
- the input / output waveguide group that is, the input waveguide group 102a on the AWG type optical wavelength multiplexer / demultiplexer substrate 101 side, the output waveguide group 102b on the tape type optical fiber 103 side, and the output waveguide group 102c on the optical fiber 104 side Is provided.
- a coupling loss can be generated between the AWG type optical wavelength multiplexer / demultiplexer substrate 101 and the pitch conversion waveguide substrate 102 or between the pitch conversion waveguide substrate 102 and the tape type optical fins 103 and 104.
- the output waveguide group 101a on the AWG type optical wavelength multiplexer / demultiplexer substrate 101 side or the input / output waveguide group 102a, 102b, 102c of the pitch conversion substrate 102 has a spot size conversion function. Is given.
- the coupling portion between the AWG type optical wavelength multiplexer / demultiplexer substrate 101 and the pitch conversion waveguide substrate 102, and the pitch conversion waveguide substrate are actually used. It was difficult to couple light without leakage at the joint between the 102 and the tape type optical fins 103 and 104. That is, due to slight axis deviation, a part of light emitted from the AWG type optical wavelength multiplexer / demultiplexer substrate 101 or the pitch conversion waveguide substrate 102 becomes leaked light. As a result, some of the leaked light is incident on an optical fiber other than the desired optical fiber, causing deterioration of crosstalk characteristics and occurrence of coupling loss.
- the AWG type optical wavelength multiplexer / demultiplexer substrate 101 is used by connecting tape type optical fibers 103 and 104, and the general size of this optical fiber is As a result, it was impossible to reduce the size of the AWG type optical wavelength multiplexer / demultiplexer substrate 101 as a result.
- the pitch conversion waveguide substrate 102 is also manufactured using a semiconductor process, an attempt to manufacture a large-sized one causes a great increase in cost, and the AWG-type optical wavelength multiplexer / demultiplexer is used.
- the cost of reducing the size of the substrate 101 and the LD array chip (not shown) is increased again.
- the alignment of the optical axes for three devices is performed for two devices. This is more than twice as difficult as doing it again, which again increases costs.
- the present invention has been made in view of such a problem, and an object of the present invention is to make it possible to couple a pitch P1 of a waveguide array with a pitch P2 of an active layer of an optical element or a waveguide portion.
- An object of the present invention is to provide a lightwave circuit module capable of directly coupling an optical element and a waveguide array with low loss while having a function of performing pitch conversion.
- the invention according to claim 1 of the present invention provides a waveguide array composed of m independent waveguides arranged at a constant pitch P1, and the pitch P is arranged at a narrow pitch P2.
- An optical device having m active layers or waveguide portions, and the pitch P1 is gradually narrowed toward the active layer or the waveguide portion of the optical device, whereby the waveguide array is formed.
- Each of the optical elements is converged in a line at the same pitch P3 as the pitch P2 to form a converging portion, and the converging portion is positioned so as to face the active layer or the waveguide portion.
- the present invention relates to a lightwave circuit module, wherein each waveguide of the waveguide array is optically coupled to an active layer or each waveguide portion.
- each of the waveguides is an optical fiber
- the optical fiber has a cladding with a core diameter as it is directed to a tip in a direction parallel to its core axis.
- the present invention relates to a lightwave circuit module characterized in that only the diameter is reduced and the number m of the reduced tip forces is focused in a line at the pitch P3 to form a focusing portion.
- the invention according to claim 3 of the present invention includes a substrate provided with a guide on a surface, and when m optical fibers are inserted into the guide, the tip of the optical fiber is A lightwave circuit module, wherein the lightwave circuit module is formed such that the light is converged in a line at a pitch P3 to form a converging portion, and that the starting end side of the optical fiber is arranged at the pitch P1. Things.
- the optical element power performs pitch conversion to the tape-type optical fiber by the optical fiber itself, which is the waveguide, the optical element and the tape-type light having different pitches from each other.
- Optical direct coupling with the fiber is enabled. Furthermore, by reducing the waveguide pitch of the converging portion of the waveguide array facing the optical device to the same size as the active layer of the optical device or the pitch of the waveguide portion, the occupation of the waveguide array inside the knocker is reduced. Space can be reduced.
- the size of the coupling portion of the waveguide array can be reduced, and a larger mounting space for the optical element is secured. Therefore, more optical elements can be mounted inside the package, and further integration of the optical elements can be achieved. Also, with the integration, it is possible to greatly reduce the assembly cost of the optical device.
- the tape-type optical fiber and the optical element can be directly coupled without interposing a pitch conversion optical component between the tape-type optical fiber and the optical element, the optical element and the pitch It is possible to prevent the occurrence of leakage light at the joint between the conversion optical component and the joint between the pitch conversion optical component and the tape type optical fiber. Therefore, it is possible to prevent deterioration of crosstalk characteristics and occurrence of coupling loss. Further, since an optical fiber is used, coupling with a higher power optical element is possible.
- FIG. 1 is a plan view showing an example of an optical lead frame according to the present invention.
- FIG. 2 is a plan view showing a substrate which is one of the components of the optical lead frame of FIG. 1.
- FIG. 3 is an enlarged view of a coupling portion between the LD array chip of FIG. 1 and a focusing unit.
- FIG. 4 A flat view schematically showing a packaged state of the optical lead frame of FIG. Area view.
- FIG. 5 is a plan view showing a conventional lightwave circuit module.
- a lightwave circuit module 1 of the present embodiment includes a tape type optical fiber 2 for multicore light propagation, a substrate 3 provided with a guide, and a laser diode (LD) as an example of an optical element. )
- An array chip 4 is provided.
- the tape type optical fiber 2 serving as a waveguide is formed of a general type of single mode optical finos in which a clad 2a surrounds a core (not shown).
- the coating 2b is peeled off by a predetermined size, and the cladding 2a with the coating 2b removed is removed.
- a predetermined diameter is applied to the distal end in a direction parallel to the core axis to reduce the diameter.
- Etching may be mentioned as a means for reducing the diameter.
- the allowable range of the propagation loss accompanying the reduction in the diameter of the cladding of the etched portion 2c to be preferably 50 m or less, it is most preferable to set the minimum diameter to 30 m. . Therefore, in the present embodiment, the description will be continued assuming that the clad diameter of the etched portion 2c is 30 m.
- the substrate 3 is made of silicon (Si), and on its surface, as shown in FIG. 2, a number 3 m of tape-type optical fibers 2 and a guide 3 b composed of the same number of grooves 3 a are provided.
- the shape of the guide 3b is such that the grooves 3a are formed so that the grooves 3a are arranged at a constant pitch P1 on one side of the substrate 3 and the pitch P1 is gradually narrowed toward the other side. , Is formed.
- the grooves 3a are formed so as to be arranged in a line with a pitch P3 having the same dimension as the cladding diameter of each optical fiber having a small diameter.
- each optical fiber bends in the groove 3a. Therefore, the curved shape of the groove 3a should be determined in consideration of the bending loss of the optical fiber. In the present embodiment, the bending loss of each optical fiber is determined so as to be less than 1.3 dB.
- the LD array chip 4 is a chip having the same number m of active layers 4 a as the number m of the tape-type optical fibers 2, and the active layers 4 a are also arranged at the pitch P and the pitch P 2. ing.
- the specific value of the pitch P2 is 30 / zm, which is the same as the pitch P3.
- the substrate 3 is mounted on a base substrate 6 inside a package 5 containing the LD array chip 4, and the focusing portion 2 d faces the active layer 4 a of the LD array chip 4
- the substrate 3 is fixed to the base substrate 6 with solder or an adhesive.
- the tape type optical fiber 2 is extended outside the knockout 5.
- a protective resin (not shown) is filled in the frame of the package 5 and epoxy-sealed. Note that there is no problem even if the base substrate 6 and the package 5 are the same.
- the light emitted from each active layer 4a is optically coupled to each optical fiber of the converging section 2d, and propagates to the start end side.
- the present invention provides the LD array chip 4 force with a tape.
- the pitch conversion to the type 2 optical fiber 2 is performed by the waveguide (optical fiber) itself.
- an optical circuit module having a waveguide structure that is directly coupled to an optical element (in the present embodiment, an LD array chip) and also serves as a pitch converter is referred to as an optical lead frame (abbreviated as optical lead frame).
- optical lead frame 1 instead of lightwave circuit module 1.
- the optical fiber is bent so that the waveguide converging portion 2 d has the same pitch P 3 as the pitch P 2 of the active layer 4 a of the LD array chip 4.
- the LD array chip 4 and the tape type optical fiber 2 having different pitches from each other can be directly optically coupled, and the pitch P3 is changed to the pitch.
- the idea of the present invention is that the space occupied by the waveguide array inside the knockout 5 is reduced by reducing the size to the same size as P2.
- the size of the coupling portion of the waveguide array can be reduced, and the mounting space for the LD array chip 4 is secured by that much. You. Therefore, many LD array chips can be mounted inside the knockout 5, and further integration of the LD array chips can be achieved. In addition, with the integration, the assembly cost of LD array chips can be significantly reduced.
- a tape-type optical fiber 2 without a pitch-conversion optical component (for example, a pitch-conversion waveguide substrate 102 in FIG. 5) interposed between the tape-type optical fiber 2 and the LD array chip 4.
- the LD array chip 4 can be directly connected, so that leakage light at the connection between the LD array chip and the pitch conversion optical component and the connection between the pitch conversion optical component and the tape-type optical fiber can be reduced. It is possible to prevent occurrence. Therefore, it is possible to prevent the deterioration of the crosstalk characteristic and the occurrence of the coupling loss. Furthermore, direct coupling enables coupling to a higher power LD array chip.
- an etched optical fiber for which mass production technology has been established is used for a waveguide having a reduced diameter. Accordingly, an optical lead frame 1 having uniform characteristics can be realized.
- an independent waveguide is used for the optical lead frame 1 according to the present invention. Independent means that the waveguide can be formed independently for each waveguide and can be used for each waveguide, such as an optical fiber. Therefore, for example, a tape-type optical fiber in which optical fibers are integrated into an array is a waveguide in which optical fibers that can be formed and used independently for each waveguide are originally integrated. Is defined as
- the present embodiment can be variously modified according to its technical concept.
- the pitch P3 of the focusing unit 2d has been described as 30 ⁇ m, but the pitch P3 is not limited to this dimension. From the viewpoint of changing the pitch P2 due to the change in the LD array chip used and suppressing crosstalk, the optimum P3 may be determined.
- the optical element described by taking an LD array chip as an example of an optical element is not limited to an LD array chip, but includes an optical element such as a light receiving element, a light emitting element, or an AWG.
- the focusing section 2d should be positioned so that the focusing section 2d faces the waveguide section.
- the size of the coupling portion of the waveguide array can be reduced, so that the AWG can be reduced in size.
- optical lead frame of the present invention in a wiring portion of optical communication or inside a chip package, it is possible to increase the amount of propagation data, reduce coupling loss, and reduce the size of the optical coupling portion.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004-101763 | 2004-03-31 | ||
JP2004101763A JP2005284202A (ja) | 2004-03-31 | 2004-03-31 | 光波回路モジュール |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005096052A1 true WO2005096052A1 (ja) | 2005-10-13 |
Family
ID=35063932
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2005/005906 WO2005096052A1 (ja) | 2004-03-31 | 2005-03-29 | 光波回路モジュール |
Country Status (2)
Country | Link |
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JP (1) | JP2005284202A (ja) |
WO (1) | WO2005096052A1 (ja) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2016003630A1 (en) * | 2014-07-02 | 2016-01-07 | Applied Materials, Inc | Temperature control apparatus including groove-routed optical fiber heating, substrate temperature control systems, electronic device processing systems, and processing methods |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1990004195A1 (en) * | 1988-10-07 | 1990-04-19 | Eastman Kodak Company | Fiber optic array |
JPH05188236A (ja) * | 1992-01-09 | 1993-07-30 | Furukawa Electric Co Ltd:The | 光アレイファイバのガイド装置 |
-
2004
- 2004-03-31 JP JP2004101763A patent/JP2005284202A/ja not_active Withdrawn
-
2005
- 2005-03-29 WO PCT/JP2005/005906 patent/WO2005096052A1/ja active Application Filing
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1990004195A1 (en) * | 1988-10-07 | 1990-04-19 | Eastman Kodak Company | Fiber optic array |
JPH05188236A (ja) * | 1992-01-09 | 1993-07-30 | Furukawa Electric Co Ltd:The | 光アレイファイバのガイド装置 |
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JP2005284202A (ja) | 2005-10-13 |
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