JP7277825B2 - 半導体光素子 - Google Patents
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- JP7277825B2 JP7277825B2 JP2021530388A JP2021530388A JP7277825B2 JP 7277825 B2 JP7277825 B2 JP 7277825B2 JP 2021530388 A JP2021530388 A JP 2021530388A JP 2021530388 A JP2021530388 A JP 2021530388A JP 7277825 B2 JP7277825 B2 JP 7277825B2
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- H01S5/00—Semiconductor lasers
- H01S5/04—Processes or apparatus for excitation, e.g. pumping, e.g. by electron beams
- H01S5/042—Electrical excitation ; Circuits therefor
- H01S5/0421—Electrical excitation ; Circuits therefor characterised by the semiconducting contacting layers
- H01S5/0422—Electrical excitation ; Circuits therefor characterised by the semiconducting contacting layers with n- and p-contacts on the same side of the active layer
- H01S5/0424—Electrical excitation ; Circuits therefor characterised by the semiconducting contacting layers with n- and p-contacts on the same side of the active layer lateral current injection
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- H01S5/124—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 incorporating phase shifts
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- H01S5/0206—Substrates, e.g. growth, shape, material, removal or bonding
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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
- H01S5/1003—Waveguide having a modified shape along the axis, e.g. branched, curved, tapered, voids
- H01S5/1014—Tapered waveguide, e.g. spotsize converter
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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
- H01S5/124—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 incorporating phase shifts
- H01S5/1243—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 incorporating phase shifts by other means than a jump in the grating period, e.g. bent waveguides
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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
- H01S5/2031—Optical confinement, e.g. absorbing-, reflecting- or waveguide-layers characterized by special waveguide layers, e.g. asymmetric waveguide layers or defined bandgap discontinuities
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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
- H01S5/227—Buried mesa structure ; Striped active layer
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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
- H01S5/3235—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 emitting light at a wavelength longer than 1000 nm, e.g. InP-based 1300 nm and 1500 nm lasers
- H01S5/32391—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 emitting light at a wavelength longer than 1000 nm, e.g. InP-based 1300 nm and 1500 nm lasers based on In(Ga)(As)P
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- Semiconductor Lasers (AREA)
Description
図7は、半導体光素子100のより具体的な断面構成の例を示す図である。図7に示す半導体光素子100は、z方向の下層からSi基板101、光導波路20、発光層10、均一回折格子30、及び電極部40を積層したものである。各層は図の奥行方向(y)に長い形状である。
図8は、基本モードの閾値利得gth0、高次モードの閾値利得gth1、及びそれらの利得差Δgthのそれぞれと変調深さΔλbの関係を計算した結果の例を示す。図8に示すように変調深さΔλbを増やすと基本モードの閾値利得gth0は低下する。また、変調深さΔλbを増やすと高次モードの閾値利得gth1は増加し、その後低下する。
図9は、空間ホールバーニングにより、光導波路20の延伸方向の両端部の屈折率が相対的に低下する様子を模式的に示す図である。図9の上側の図は、光導波路20のy方向の位置(横軸)とブラック波長(縦軸)の関係を示す。下側の図は、光導波路の平面形状を模式的に示す。図9(a)は電流を注入する前、図9(b)は電流を注入している場合を示す。
狭線幅化するためには、共振器損を下げることが有効であることは既に説明したとおりである。基本モ-ドの共振器損を下げるためには、均一回折格子30の結合係数を上げる、又は均一回折格子30の長さを長くする必要がある。
図15は、半導体光素子100の変形例の断面構成の例を示す図である。図15に示す変形例1は、均一回折格子30をシリコンコア22(図7)と同じ平面上に配置したものである。
図16は、光導波路20の変形例の平面形状を模式的に示す図である。図16に示す変形例2の光導波路20は、第2部分20bの幅が第1部分20aよりも狭い点で上記の実施形態と異なる。
図17は、光導波路20の他の変形例の平面形状を模式的に示す図である。図17に示す変形例3の光導波路20は、第1部分20aの位置を光導波路20のy方向の中心からずらした点で上記の実施形態と異なる。
12a:活性層
20:光導波路
20a:第1部分
20b:第2部分
20c:第3部分
20d:拡幅領域
20e:縮幅領域
20f:第4部分
20g:第5部分
20h:第1連結部分
20i:第2連結部分
20j:連結部分
30:均一回折格子
40:電極部
40A:アノード電極
40K:カソード電極
100:半導体光素子
Claims (4)
- 電流注入状態において発光する発光層と、
前記発光層の延伸方向に沿い該延伸方向の幅又は厚さが変化する光導波路と、
周期、幅、及び深さが一定の均一回折格子と、を備え、
前記発光層と前記光導波路と前記均一回折格子のそれぞれは、光学的に結合する位置に配置され、
前記均一回折格子は、前記発光層の上に配置され、前記光導波路は前記発光層の下に配置される
半導体光素子。 - 電流注入状態において発光する発光層と、
前記発光層の延伸方向に沿い該延伸方向の幅又は厚さが変化する光導波路と、
周期、幅、及び深さが一定の均一回折格子と、を備え、
前記発光層と前記光導波路と前記均一回折格子のそれぞれは、光学的に結合する位置に配置され、
前記光導波路は、該延伸方向に、所定の幅の第1部分、該第1部分よりも幅の狭い第2部分、前記第1部分よりも幅の広い第3部分、該第3部分よりも幅の狭い第4部分、及び前記第1部分と同じ幅の第5部分とを含み、
前記第1部分と前記第3部分との間を滑らかに接続する第1連結部分と、前記第3部分と前記第5部分との間を滑らかに接続する第2連結部分とを備える
半導体光素子。 - 電流注入状態において発光する発光層と、
前記発光層の延伸方向に沿い該延伸方向の幅又は厚さが変化する光導波路と、
周期、幅、及び深さが一定の均一回折格子と、を備え、
前記発光層と前記光導波路と前記均一回折格子のそれぞれは、光学的に結合する位置に配置され、
前記光導波路は、該延伸方向に、所定の幅の第1部分、該第1部分よりも幅の広い第2部分、及び前記第1部分と同じ幅の第3部分とを含み、
前記第1部分と前記第2部分との間を滑らかに接続する拡幅領域と、前記第2部分と前記第3部分との間を滑らかに接続する縮幅領域とを備え
前記光導波路の延伸方向の両端部の幅は、前記第1部分の幅よりも広い
半導体光素子。 - 電流注入状態において発光する発光層と、
前記発光層の延伸方向に沿い該延伸方向の幅又は厚さが変化する光導波路と、
周期、幅、及び深さが一定の均一回折格子と、を備え、
前記発光層と前記光導波路と前記均一回折格子のそれぞれは、光学的に結合する位置に配置され、
前記光導波路は、シリコンコアとSiO2クラッドとを含む
半導体光素子。
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US20160104997A1 (en) | 2014-10-10 | 2016-04-14 | Nlight Photonics Corporation | Multiple flared laser oscillator waveguide |
JP2016171173A (ja) | 2015-03-12 | 2016-09-23 | 日本電信電話株式会社 | 半導体光素子 |
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JPS6189690A (ja) * | 1984-10-09 | 1986-05-07 | Fujitsu Ltd | 半導体レ−ザ |
JPS61216383A (ja) * | 1985-03-20 | 1986-09-26 | Nec Corp | 分布帰還型半導体レ−ザ |
JPS63186A (ja) * | 1986-06-19 | 1988-01-05 | Fujitsu Ltd | 半導体レ−ザ |
JP2609776B2 (ja) * | 1990-06-12 | 1997-05-14 | 株式会社東芝 | 半導体レーザ |
US5272714A (en) * | 1991-12-12 | 1993-12-21 | Wisconsin Alumni Research Foundation | Distributed phase shift semiconductor laser |
JPH1051066A (ja) * | 1996-08-05 | 1998-02-20 | Fujitsu Ltd | 分布帰還型半導体レーザ装置 |
JP3885978B2 (ja) * | 1997-01-31 | 2007-02-28 | シャープ株式会社 | 利得結合分布帰還型半導体レーザ装置 |
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US20160104997A1 (en) | 2014-10-10 | 2016-04-14 | Nlight Photonics Corporation | Multiple flared laser oscillator waveguide |
JP2016171173A (ja) | 2015-03-12 | 2016-09-23 | 日本電信電話株式会社 | 半導体光素子 |
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