JP2013218155A - Optical component - Google Patents

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JP2013218155A
JP2013218155A JP2012089335A JP2012089335A JP2013218155A JP 2013218155 A JP2013218155 A JP 2013218155A JP 2012089335 A JP2012089335 A JP 2012089335A JP 2012089335 A JP2012089335 A JP 2012089335A JP 2013218155 A JP2013218155 A JP 2013218155A
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optical element
waveguide
type optical
mount
waveguide type
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Takao Fukumitsu
高雄 福滿
Yoshiyuki Doi
芳行 土居
Takeshi Tsuzuki
健 都築
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Nippon Telegraph and Telephone Corp
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Nippon Telegraph and Telephone Corp
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Abstract

PROBLEM TO BE SOLVED: To provide an optical component having some waveguide-type optical elements fixed to a convex portion of a mount, which has a simple configuration to suppress degradation of optical properties due to thermal stress and external mechanical force.SOLUTION: An optical component 200 includes: a first waveguide-type optical element 201 such as a PLC; a second waveguide-type optical element 202 butt-joined with the first waveguide-type optical element 201; and a mount 210 having a convex portion 211 to which the first waveguide-type optical element 201 is directly fixed. The second waveguide-type optical element 202 has first and second optical element support members 301, 302 which are adhered or soldered to the side walls thereof to face each other. The first and second optical element support members 301, 302 are in contact with the mount 210 such that the friction force therebetween resists move of the second waveguide-type optical element 202 in a direction (x-direction) perpendicular to a light beam direction. As for the light beam direction (y-direction), thermal expansion will move the second waveguide-type optical element 202 if thermal stress is exerted thereon for a long period of time.

Description

本発明は、光部品に関し、より詳細には、導波路型光素子を備える光部品に関する。   The present invention relates to an optical component, and more particularly to an optical component including a waveguide type optical element.

光通信システムの高度化に伴い、高機能な光モジュール(光部品)の需要が高まっている。導波路型光素子は、基板上に光導波路を形成することによって様々な光波回路を実現することができ、光モジュールの構成部品として用いられている。光モジュールの更なる高機能化のために、異なる機能を有する導波路型光素子を集積化したり、レンズ・空間位相変調器等の空間光学系部品と導波路型光素子とを集積化したハイブリッド光モジュールが実現されている。具体的な光モジュールの例としては、(1)アレイ導波路格子(AWG)と可変光減衰器(VOA)を異なる平面光波回路(PLC)基板上に形成した後、それらを光結合したV−AWGモジュール、(2)石英系ガラスとニオブ酸リチウム(LN)のように異なる材料で構成された導波路型光素子を光結合したRZ−DQPSK(Return to Zero Differential Quadrature Phase Shift Keying)モジュール、(3)空間位相変調器であるLCOS(Liquid Crystal On Silicon)とPLCとを光結合したTODC(Tunable Optical Dispersion Compensator)モジュール等が挙げられる。   With the advancement of optical communication systems, the demand for highly functional optical modules (optical components) is increasing. A waveguide type optical element can realize various lightwave circuits by forming an optical waveguide on a substrate, and is used as a component of an optical module. A hybrid that integrates waveguide-type optical elements with different functions or integrates optical components such as lenses and spatial phase modulators and waveguide-type optical elements to further enhance the functionality of optical modules. An optical module is realized. As an example of a specific optical module, (1) an arrayed waveguide grating (AWG) and a variable optical attenuator (VOA) are formed on different planar lightwave circuit (PLC) substrates, and then they are optically coupled. AWG module, (2) RZ-DQPSK (Return to Zero Differential Shift Keying) module in which waveguide type optical elements composed of different materials such as quartz glass and lithium niobate (LN) are optically coupled, 3) A TODC (Tunable Optical Displacement Compensator) module in which LCOS (Liquid Crystal On Silicon), which is a spatial phase modulator, and a PLC are optically coupled to each other can be used.

ハイブリッド光モジュールは、機械的な振動や衝撃などの外力による影響を低減するため、PLC等の導波路型光素子をマウント上に固定して作製されるが、導波路型光素子・マウント間の熱膨張係数の差により発生する熱応力の問題がある。特許文献1には、複数のPLCチップが接続された素子をマウントに固定した光モジュールにおいて、PLCチップ接続部に対する熱応力を軽減する技術が開示されている。図1(特許文献1の図1に対応)を参照して説明すると、特許文献1のハイブリッド光モジュールは、PLCチップ2とPLCチップ3が突き合わせ接続(バットジョイント)されており、PLCチップ2がマウント1の凸部に直接固定されている。PLCチップ3はマウント1から浮いており、これにより、PLCチップ3とマウント1との間の熱膨張の差に起因する熱応力を抑制し、PLCチップ接続部における結合損失を低減している。PLCチップ3とマウント1との間には充填材14が充填されており、PLCチップ3は、マウント1に設けられた保持用凸部10の側面に塗布された弾性接着剤9a、9bによりさらに保持されている。当該構成により、PLCチップ接続部の結合損失に最も影響する方向である、基板に垂直な方向(z方向)に対して機械的な振動や衝撃が加わっても、PLCチップ3が上下方向に変動しないようにしている。   A hybrid optical module is manufactured by fixing a waveguide type optical element such as a PLC on a mount in order to reduce the influence of external forces such as mechanical vibration and shock. There is a problem of thermal stress generated by the difference in thermal expansion coefficient. Patent Document 1 discloses a technique for reducing thermal stress on a PLC chip connection portion in an optical module in which an element to which a plurality of PLC chips are connected is fixed to a mount. Referring to FIG. 1 (corresponding to FIG. 1 of Patent Document 1), the hybrid optical module of Patent Document 1 has a PLC chip 2 and a PLC chip 3 butt-connected (butt joint). It is directly fixed to the convex part of the mount 1. The PLC chip 3 floats from the mount 1, thereby suppressing the thermal stress caused by the difference in thermal expansion between the PLC chip 3 and the mount 1 and reducing the coupling loss at the PLC chip connecting portion. A filler 14 is filled between the PLC chip 3 and the mount 1, and the PLC chip 3 is further expanded by elastic adhesives 9 a and 9 b applied to the side surfaces of the holding projections 10 provided on the mount 1. Is retained. With this configuration, even if mechanical vibration or impact is applied to the direction perpendicular to the substrate (z direction), which is the direction that most affects the coupling loss of the PLC chip connection portion, the PLC chip 3 fluctuates in the vertical direction. I try not to.

特開2009−175364号公報JP 2009-175364 A

しかしながら、PLCチップ3に対して機械的な振動等が加わった場合に光モジュールの光学特性を劣化させないように弾性接着剤9a、9b及び充填材14を最適化するのは容易でなく、さらなる改善が望まれている。   However, it is not easy to optimize the elastic adhesives 9a and 9b and the filler 14 so that the optical characteristics of the optical module are not deteriorated when mechanical vibration or the like is applied to the PLC chip 3, and further improvements are made. Is desired.

加えて、理論上は、PLCチップ接続部の結合損失に最も影響する方向は基板に垂直な方向(z方向)であるが、実験的には、基板に平行、かつ、導波路型光素子の光線方向(y方向)に垂直な方向(x方向)の振動がチッピング等の大きな問題となることが分かってきた。簡便な構成により、当該方向の振動を抑制することが望まれる。   In addition, theoretically, the direction that most affects the coupling loss of the PLC chip connection portion is the direction perpendicular to the substrate (z direction). However, experimentally, the direction of the waveguide type optical element is parallel to the substrate. It has been found that vibration in the direction (x direction) perpendicular to the light beam direction (y direction) becomes a major problem such as chipping. It is desired to suppress vibration in the direction with a simple configuration.

本発明は、このような問題点に鑑みてなされたものであり、その目的は、導波路型光素子の一部がマウントの凸部に固定された光部品において、熱応力および機械的外力による光学特性の劣化を簡便な構成により抑制することにある。   The present invention has been made in view of such problems, and an object of the present invention is to cause thermal stress and mechanical external force in an optical component in which a part of a waveguide optical element is fixed to a convex portion of a mount. The purpose is to suppress the deterioration of the optical characteristics by a simple configuration.

このような目的を達成するために、本発明の第1の態様は、第1の導波路型光素子と、前記第1の導波路型光素子に突き合わせ接続された第2の導波路型光素子と、前記第1の導波路型光素子が直接固定された凸部を有するマウントと、前記第2の導波路型光素子に固定され、前記マウントと接触する光素子支持台とを備えることを特徴とする光部品である。   In order to achieve such an object, according to a first aspect of the present invention, there is provided a first waveguide-type optical element and a second waveguide-type light that is butt-connected to the first waveguide-type optical element. An element, a mount having a convex portion to which the first waveguide optical element is directly fixed, and an optical element support fixed to the second waveguide optical element and in contact with the mount. Is an optical component characterized by

また、本発明の第2の態様は、第1の態様において、前記光素子支持台が、前記第2の導波路型光素子の両側の側壁にそれぞれ固定された、互いに対向する第1及び第2の光素子支持台を備えることを特徴とする。   According to a second aspect of the present invention, in the first aspect, the optical element support bases are fixed to side walls on both sides of the second waveguide optical element, and are opposed to each other. 2 optical element support bases.

また、本発明の第3の態様は、第1の態様において、前記光素子支持台が、前記マウントと向かい合う面に固定された光素子支持台を備えることを特徴とする。   According to a third aspect of the present invention, in the first aspect, the optical element support base includes an optical element support base fixed to a surface facing the mount.

本発明によれば、第1の導波路型光素子と第1の導波路型光素子に突き合わせ接続された第2の導波路型光素子とを備える光部品において、第1の導波路型光素子がマウントの凸部に直接固定され、前記第2の導波路型光素子には、マウントと接触する光素子支持台が固定されていることにより、熱応力および機械的外力による光学特性の劣化を簡便な構成により抑制することができる。   According to the present invention, in an optical component comprising a first waveguide type optical element and a second waveguide type optical element butt-connected to the first waveguide type optical element, the first waveguide type optical element is provided. Since the element is directly fixed to the convex portion of the mount, and the optical element support that is in contact with the mount is fixed to the second waveguide type optical element, the optical characteristics are deteriorated due to thermal stress and mechanical external force. Can be suppressed by a simple configuration.

従来のハイブリッド光モジュールを示す図である。It is a figure which shows the conventional hybrid optical module. 本発明の一実施形態に係る光部品を示す図である。It is a figure which shows the optical component which concerns on one Embodiment of this invention. 図2(b)のIII−III線に沿った断面図である。It is sectional drawing along the III-III line of FIG.2 (b). 本発明の変形形態に係る光部品の断面図である。It is sectional drawing of the optical component which concerns on the modification of this invention.

以下、図面を参照して本発明の実施形態を詳細に説明する。   Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

図2に、本発明の一実施形態に係る光部品を示す。光部品200は、PLC等の第1の導波路型光素子201と、第1の導波路型光素子201に突き合わせ接続された第2の導波路型光素子202と、第1の導波路型光素子201が直接固定された凸部211を有するマウント210とを備える。第2の導波路型光素子202はマウント210から浮いており、これにより、第2の導波路型光素子202とマウント210との間の熱膨張の差に起因する、導波路型光素子の接続部や、第2の導波路型光素子202自体に対する熱応力を抑制している。   FIG. 2 shows an optical component according to an embodiment of the present invention. The optical component 200 includes a first waveguide type optical element 201 such as a PLC, a second waveguide type optical element 202 butt-connected to the first waveguide type optical element 201, and a first waveguide type. And a mount 210 having a convex portion 211 to which the optical element 201 is directly fixed. The second waveguide type optical element 202 is floating from the mount 210, and thus the waveguide type optical element due to the difference in thermal expansion between the second waveguide type optical element 202 and the mount 210. The thermal stress on the connection portion and the second waveguide type optical element 202 itself is suppressed.

本実施形態に係る光部品では、第2の導波路型光素子202の保持に弾性接着剤や充填材を用いていない。図2(b)のIII−III線に沿った断面図である図3を参照して、第2の導波路型光素子202の保持構造を説明する。第2の導波路型光素子202には、両側の側壁に互いに対向する第1及び第2の光素子支持台301、302が接着、半田付け等によって固定されている。第1及び第2の光素子支持台301、302は、マウント210と接触しており、摩擦力により、第2の導波路型光素子202の光線方向に垂直な方向(x方向)の移動を抑制する。   In the optical component according to the present embodiment, no elastic adhesive or filler is used to hold the second waveguide type optical element 202. With reference to FIG. 3 which is a cross-sectional view taken along line III-III in FIG. 2B, a holding structure of the second waveguide type optical element 202 will be described. In the second waveguide type optical element 202, first and second optical element support stands 301 and 302 facing each other are fixed to the side walls on both sides by adhesion, soldering or the like. The first and second optical element supporting bases 301 and 302 are in contact with the mount 210, and move in a direction (x direction) perpendicular to the light beam direction of the second waveguide optical element 202 by frictional force. Suppress.

熱膨張があった場合、長時間熱応力が加わると熱応力と時間の積(力積)が大きくなり摩擦力を上回ることで移動が生じる。このとき、光線方向に垂直な方向(x方向)に関しては、第1の導波路型光素子201と第2の導波路型光素子202とも同方向(x方向)には拘束されていないため、光線方向に平行な中心軸に対し対称に膨張する。このため同方向の位置の変化はない。光線方向(y方向)には、第1の導波路型光素子201と第2の導波路型光素子202は、凸部211によってマウント210に固定される部分があるため、光線方向(y方向)に凸部211から遠ざかる方向に膨張する。このため光線方向に位置が移動する。   In the case of thermal expansion, when a thermal stress is applied for a long time, the product (impulse) of the thermal stress and time increases, and the movement occurs by exceeding the frictional force. At this time, the first waveguide optical element 201 and the second waveguide optical element 202 are not restricted in the same direction (x direction) with respect to the direction perpendicular to the light beam direction (x direction). It expands symmetrically with respect to the central axis parallel to the ray direction. For this reason, there is no change in the position in the same direction. In the light beam direction (y direction), the first waveguide type optical element 201 and the second waveguide type optical element 202 have a portion fixed to the mount 210 by the convex portion 211. ) In a direction away from the convex portion 211. For this reason, the position moves in the light beam direction.

第1及び第2の光素子支持台301、302は、それらが固定された第2の導波路型光素子202の熱膨張係数にほぼ等しい材料で作製してもよい。第2の導波路型光素子202がPLCの場合、PLCに熱膨張係数を合わせた材料として、シリコン、石英ガラス、ホウケイ酸ガラス(パイレックス(登録商標)ガラス)などが適用できる。熱膨張係数を合わせることによって、第1及び第2の光素子支持台301、302と第2の導波路型光素子202が剥がれることを抑制することができる。   The first and second optical element support bases 301 and 302 may be made of a material substantially equal to the thermal expansion coefficient of the second waveguide optical element 202 to which they are fixed. When the second waveguide optical element 202 is a PLC, silicon, quartz glass, borosilicate glass (Pyrex (registered trademark) glass), or the like can be used as a material in which the thermal expansion coefficient is matched with the PLC. By matching the thermal expansion coefficients, it is possible to prevent the first and second optical element supporting bases 301 and 302 and the second waveguide type optical element 202 from peeling off.

図4に、本発明の変形形態を示す。図2及び3の実施形態では、第2の導波路型光素子202の側壁に第1及び第2の光素子支持台301、302を固定したが、本実施形態では、第2の導波路型光素子202のマウント210と向かい合う面に光素子支持台401を固定する。光素子支持台401はマウント210の表面と接触しており、摩擦力により、第2の導波路型光素子202の光線方向に垂直な方向(x方向)の移動を抑制する。   FIG. 4 shows a modification of the present invention. 2 and 3, the first and second optical element supporting bases 301 and 302 are fixed to the side wall of the second waveguide type optical element 202. However, in this embodiment, the second waveguide type optical element 202 is fixed. The optical element support base 401 is fixed to the surface of the optical element 202 facing the mount 210. The optical element support base 401 is in contact with the surface of the mount 210, and the movement of the second waveguide optical element 202 in the direction (x direction) perpendicular to the light beam direction is suppressed by the frictional force.

200 光部品
201 第1の導波路型光素子
202 第2の導波路型光素子
210 マウント
211 凸部
301 第1の光素子支持台
302 第2の光素子支持台
401 光素子支持台
DESCRIPTION OF SYMBOLS 200 Optical component 201 1st waveguide type optical element 202 2nd waveguide type optical element 210 Mount 211 Convex part 301 1st optical element support stand 302 2nd optical element support stand 401 Optical element support stand

Claims (3)

第1の導波路型光素子と、
前記第1の導波路型光素子に突き合わせ接続された第2の導波路型光素子と、
前記第1の導波路型光素子が直接固定された凸部を有するマウントと、
前記第2の導波路型光素子に固定され、前記マウントと接触する光素子支持台と
を備えることを特徴とする光部品。
A first waveguide type optical element;
A second waveguide type optical element butt-connected to the first waveguide type optical element;
A mount having a convex portion to which the first waveguide optical element is directly fixed;
An optical component comprising: an optical element support that is fixed to the second waveguide optical element and is in contact with the mount.
前記光素子支持台は、前記第2の導波路型光素子の両側の側壁にそれぞれ固定された、互いに対向する第1及び第2の光素子支持台を備えることを特徴とする請求項1記載の光部品。   The said optical element support stand is equipped with the 1st and 2nd optical element support stand which mutually opposes each fixed to the side wall of the both sides of a said 2nd waveguide type optical element. Optical parts. 前記光素子支持台は、前記マウントと向かい合う面に固定された光素子支持台を備えることを特徴とする請求項1記載の光部品。   The optical component according to claim 1, wherein the optical element support includes an optical element support fixed to a surface facing the mount.
JP2012089335A 2012-04-10 2012-04-10 Optical component Pending JP2013218155A (en)

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