JP6341344B1 - 半導体光デバイス - Google Patents
半導体光デバイス Download PDFInfo
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- 239000004065 semiconductor Substances 0.000 title claims abstract description 92
- 239000010410 layer Substances 0.000 claims abstract description 259
- 238000005253 cladding Methods 0.000 claims abstract description 90
- 230000001629 suppression Effects 0.000 claims abstract description 57
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- 239000000758 substrate Substances 0.000 claims abstract description 30
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- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 229910000530 Gallium indium arsenide Inorganic materials 0.000 description 1
- -1 Ta 2 O 5 Inorganic materials 0.000 description 1
- 238000000347 anisotropic wet etching Methods 0.000 description 1
- 238000000149 argon plasma sintering Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
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- 238000000034 method Methods 0.000 description 1
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- 229910052725 zinc Inorganic materials 0.000 description 1
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- G—PHYSICS
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- 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
- G02B6/12004—Combinations of two or more optical elements
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- H—ELECTRICITY
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- H01S5/00—Semiconductor lasers
- H01S5/02—Structural details or components not essential to laser action
- H01S5/026—Monolithically integrated components, e.g. waveguides, monitoring photo-detectors, drivers
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- H01S5/00—Semiconductor lasers
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- H01S5/00—Semiconductor lasers
- H01S5/10—Construction or shape of the optical resonator, e.g. extended or external cavity, coupled cavities, bent-guide, varying width, thickness or composition of the active region
- H01S5/12—Construction or shape of the optical resonator, e.g. extended or external cavity, coupled cavities, bent-guide, varying width, thickness or composition of the active region the resonator having a periodic structure, e.g. in distributed feedback [DFB] lasers
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- H01S5/00—Semiconductor lasers
- H01S5/20—Structure or shape of the semiconductor body to guide the optical wave ; Confining structures perpendicular to the optical axis, e.g. index or gain guiding, stripe geometry, broad area lasers, gain tailoring, transverse or lateral reflectors, special cladding structures, MQW barrier reflection layers
- H01S5/22—Structure or shape of the semiconductor body to guide the optical wave ; Confining structures perpendicular to the optical axis, e.g. index or gain guiding, stripe geometry, broad area lasers, gain tailoring, transverse or lateral reflectors, special cladding structures, MQW barrier reflection layers having a ridge or stripe structure
- H01S5/2205—Structure or shape of the semiconductor body to guide the optical wave ; Confining structures perpendicular to the optical axis, e.g. index or gain guiding, stripe geometry, broad area lasers, gain tailoring, transverse or lateral reflectors, special cladding structures, MQW barrier reflection layers having a ridge or stripe structure comprising special burying or current confinement layers
- H01S5/2222—Structure or shape of the semiconductor body to guide the optical wave ; Confining structures perpendicular to the optical axis, e.g. index or gain guiding, stripe geometry, broad area lasers, gain tailoring, transverse or lateral reflectors, special cladding structures, MQW barrier reflection layers having a ridge or stripe structure comprising special burying or current confinement layers having special electric properties
- H01S5/2224—Structure or shape of the semiconductor body to guide the optical wave ; Confining structures perpendicular to the optical axis, e.g. index or gain guiding, stripe geometry, broad area lasers, gain tailoring, transverse or lateral reflectors, special cladding structures, MQW barrier reflection layers having a ridge or stripe structure comprising special burying or current confinement layers having special electric properties semi-insulating semiconductors
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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
- G02B6/10—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
- G02B2006/12083—Constructional arrangements
- G02B2006/12121—Laser
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- H—ELECTRICITY
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- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
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- H01S2301/02—ASE (amplified spontaneous emission), noise; Reduction thereof
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- H01S2301/00—Functional characteristics
- H01S2301/17—Semiconductor lasers comprising special layers
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- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/10—Construction or shape of the optical resonator, e.g. extended or external cavity, coupled cavities, bent-guide, varying width, thickness or composition of the active region
- H01S5/1053—Comprising an active region having a varying composition or cross-section in a specific direction
- H01S5/106—Comprising an active region having a varying composition or cross-section in a specific direction varying thickness along the optical axis
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- H01S5/00—Semiconductor lasers
- H01S5/20—Structure or shape of the semiconductor body to guide the optical wave ; Confining structures perpendicular to the optical axis, e.g. index or gain guiding, stripe geometry, broad area lasers, gain tailoring, transverse or lateral reflectors, special cladding structures, MQW barrier reflection layers
- H01S5/2004—Confining in the direction perpendicular to the layer structure
- H01S5/2018—Optical confinement, e.g. absorbing-, reflecting- or waveguide-layers
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- H01S5/00—Semiconductor lasers
- H01S5/30—Structure or shape of the active region; Materials used for the active region
- H01S5/32—Structure or shape of the active region; Materials used for the active region comprising PN junctions, e.g. hetero- or double- heterostructures
- H01S5/323—Structure or shape of the active region; Materials used for the active region comprising PN junctions, e.g. hetero- or double- heterostructures in AIIIBV compounds, e.g. AlGaAs-laser, InP-based laser
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- Microelectronics & Electronic Packaging (AREA)
- Geometry (AREA)
- Semiconductor Lasers (AREA)
Abstract
Description
幅および長さを持つ半導体基板と、
前記半導体基板の上に設けられ、活性層を含むレーザ部と、
前記半導体基板に積層された下クラッド層と前記下クラッド層に積層され前記活性層の端部と接続されたコア層と前記コア層に積層された上クラッド層とを含み、前記半導体基板の上において前記長さ方向における前記レーザ部の隣に設けられた光導波路部と、
前記上クラッド層の上面と前記上クラッド層の内部における前記コア層の上方との何れかに設けられ、前記光導波路部の全長よりも短い長さを持ち、前記長さ方向における前記光導波路部の中央に配置された反射抑制層と、
を備え、
前記反射抑制層は、前記レーザ部の側に設けられた一端と前記一端と反対側の他端とを持ち、
前記反射抑制層の前記一端は、前記長さ方向において、前記レーザ部と前記光導波路部との境界から、予め定められた所定距離だけ離されたものである。
図1〜図4は、本発明の実施の形態1にかかる半導体光デバイス20を示す断面図である。図2は、図1の一部分を拡大したものである。図1のA−A線に沿う半導体光デバイス20の断面が、図3である。図1のB−B線に沿う半導体光デバイス20の断面が、図4である。図3および図4のC−C線に沿う半導体光デバイス20の断面が、図1である。図1〜図4に、長さ方向、幅方向x、および厚さ方向yを定めたxyz直交座標軸を示す。
m=3.17−0.1i
d2 ≦ d1×tanθC
ただし、上クラッド層6の材料がInPの場合は、θC=18°となる。InPの屈折率は、3.17である。
図7は、本発明の実施の形態2にかかる半導体光デバイス22を示す断面図である。実施の形態2にかかる半導体光デバイス22は、実施の形態1の第一反射抑制層13を、第二反射抑制層15に置き換えたものである。実施の形態2にかかる第二反射抑制層15は、反射防止膜である。第二反射抑制層15は、第二上クラッド層6bの上面における中央部6cで散乱光が反射されることを防ぐ。第二反射抑制層15を構成する反射防止膜は、誘電体からなる。反射防止膜の誘電体材料は、SiO2、Al2O3、TiO、Ta2O5、およびSiNなどからなる誘電体材料群から選択された一つの材料を含んでもよく、あるいはこの誘電体材料群から複数の材料を組み合わせた材料を含んでもよい。
図8は、本発明の実施の形態3にかかる半導体光デバイス24を示す断面図である。実施の形態1の第一反射抑制層13が、第三反射抑制層16に置き換えられている。実施の形態3にかかる第三反射抑制層16は、回折格子である。第三反射抑制層16は、第二上クラッド層6bの上面における中央部6cの付近に達した光を回折する。
2 レーザ部
3 光導波路部
4 下クラッド層
5 活性層
6 上クラッド層
6a 第一上クラッド層
6b 第二上クラッド層
6c 中央部
7 回折格子
8 コア層
9 電極
10 後端面
11 バットジョイント界面
12 出射端面
13 第一反射抑制層
15 第二反射抑制層
16 第三反射抑制層
19 埋込層
20、22、24 半導体光デバイス
30a 第一光線
30b 第二光線
30c 第三光線
L1 光導波路部の全長
L2 第一〜第三反射抑制層の長さ
Q レーザ部と光導波路部との仮想境界線
d1 上クラッド層の厚さ
d2 所定距離
θC 全反射臨界角
Claims (6)
- 幅および長さを持つ半導体基板と、
前記半導体基板の上に設けられ、活性層を含むレーザ部と、
前記半導体基板に積層された下クラッド層と前記下クラッド層に積層され前記活性層の端部と接続されたコア層と前記コア層に積層された上クラッド層とを含み、前記半導体基板の上において前記長さ方向における前記レーザ部の隣に設けられた光導波路部と、
前記上クラッド層の上面と前記上クラッド層の内部における前記コア層の上方との何れかに設けられ、前記光導波路部の全長よりも短い長さを持ち、前記長さ方向における前記光導波路部の中央に配置された反射抑制層と、
を備え、
前記反射抑制層は、前記レーザ部の側に設けられた一端と前記一端と反対側の他端とを持ち、
前記反射抑制層の前記一端は、前記長さ方向において、前記レーザ部と前記光導波路部との境界から、予め定められた所定距離だけ離された半導体光デバイス。 - 幅および長さを持つ半導体基板と、
前記半導体基板の上に設けられ、活性層を含むレーザ部と、
前記半導体基板に積層された下クラッド層と前記下クラッド層に積層され前記活性層の端部と接続されたコア層と前記コア層に積層された上クラッド層とを含み、前記半導体基板の上において前記長さ方向における前記レーザ部の隣に設けられた光導波路部と、
前記上クラッド層の上面と前記上クラッド層の内部における前記コア層の上方との何れかに設けられ、前記光導波路部の全長よりも短い長さを持つ反射抑制層と、
を備え、
前記反射抑制層は、前記レーザ部の側に設けられた一端と前記一端と反対側の他端とを持ち、
前記反射抑制層の前記一端は、前記長さ方向において、前記レーザ部と前記光導波路部との境界から、予め定められた所定距離だけ離されており、
前記光導波路部は、信号光を出射する出射端面を有し、
前記反射抑制層は、前記長さ方向において、前記光導波路部の中央から前記レーザ部の側に伸び、
前記反射抑制層は、前記長さ方向において、前記光導波路部の前記中央よりも前記出射端面の側には設けられていない半導体光デバイス。 - 前記上クラッド層の厚さをd1とし、前記上クラッド層の全反射臨界角をθCとし、前記所定距離をd2としたときに、
d2≦d1×tanθC
である請求項1または2に記載の半導体光デバイス。 - 前記反射抑制層は、前記活性層のバンドギャップ以下のバンドギャップを持つ材料からなる光吸収層である請求項1または2に記載の半導体光デバイス。
- 前記反射抑制層は、前記上クラッド層の前記上面に重ねられた反射防止膜である請求項1または2に記載の半導体光デバイス。
- 前記反射抑制層は、前記上クラッド層の前記上面に重ねられた回折格子である請求項1または2に記載の半導体光デバイス。
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CN111052520A (zh) | 2020-04-21 |
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US11128102B2 (en) | 2021-09-21 |
JPWO2019049268A1 (ja) | 2019-11-07 |
WO2019049268A1 (ja) | 2019-03-14 |
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