JP6490705B2 - 半導体光集積素子およびその製造方法 - Google Patents
半導体光集積素子およびその製造方法 Download PDFInfo
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- JP6490705B2 JP6490705B2 JP2016553089A JP2016553089A JP6490705B2 JP 6490705 B2 JP6490705 B2 JP 6490705B2 JP 2016553089 A JP2016553089 A JP 2016553089A JP 2016553089 A JP2016553089 A JP 2016553089A JP 6490705 B2 JP6490705 B2 JP 6490705B2
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Description
(平面構造)
図1は、第1実施形態に係る半導体光集積素子を示す上面模式図である。なお、図1に示される上面模式図は、簡単化のために、導波路のみを図示し、電極などの他の構成要素を省略して示している。
図2〜図4は、導波路に垂直な面におけるそれぞれSSC111、SOA112、および変調器121の断面模式図である。図2に示すSSC111の断面模式図は、図1におけるA−A断面に対応し、図3に示すSOA112の断面模式図は、図1におけるB−B断面に対応し、図4に示す変調器121の断面模式図は、図1におけるC−C断面に対応している。
図2に示すように、SSC111は、基板101上に、下部クラッド層102、導波路コア層103a、および上部クラッド層104を順次積層した構造を有している。基板101の材料はInPであり、下部クラッド層102の材料はn−InPである。なお、基板101の材料は、n−InPとしてもよい。また、高周波特性を重視する場合には、n側電極を下部クラッド層102に設けて、基板101の材料を半絶縁InPとしてもよい。
図3に示すように、SOA112は、基板101上に、下部クラッド層102、導波路コア層103b、および上部クラッド層104を順次積層した構造を有している。なお、基板101、下部クラッド層102、および上部クラッド層104の材料はSSC111と同一である。
図4に示すように、変調器121は、基板101上に、下部クラッド層102、導波路コア層103c、および上部クラッド層104を順次積層した構造を有している。なお、基板101上、下部クラッド層102、および上部クラッド層104の材料はSSC111と同一である。
次に、図5〜図12を参照しながら、第1実施形態に係る半導体光集積素子100の製造方法を説明する。図5〜図12には、各工程におけるSSC111、SOA112、および変調器121の製造進捗の様子が並列に記載されている。図5〜図12の(a),(b),(c)は、それぞれSSC111(各図の(a))、SOA112(各図の(b))、および変調器121(各図の(c))の製造進捗の様子を示しており、同一の図における(a),(b),(c)の図は、同一段階におけるSSC111、SOA112、および変調器121を形成する領域の断面図を示している。なお、説明を容易にするために、製造途中であっても、同一の参照符号を用いてSSC111、SOA112、および変調器121を指し示すものとする。
以下では、本実施形態に係る半導体光集積素子100の特性について、随時比較例を示しながら説明する。
(平面構造)
図15は、第2実施形態に係る半導体光集積素子の上面模式図を示す図である。なお、図15に示される上面模式図は、簡単化のために、導波路のみを図示し、電極などの他の構成要素を省略して示している。
図16〜図19は、導波路に垂直な面におけるそれぞれDFBレーザ211、AWG221、SOA231、および端面窓構造部232の断面模式図である。
図16に示すように、DFBレーザ211は、基板201上に、下部クラッド層202、導波路コア層203a、および上部クラッド層104を順次積層した構造を有している。基板201の材料はInPであり、下部クラッド層202の材料はn−InPである。なお、基板201の材料は、n−InPとしてもよい。また、高周波特性を重視する場合には、n側電極を下部クラッド層202に設けて、基板201の材料を半絶縁InPとしてもよい。
図17に示すように、AWG221は、基板201上に、下部クラッド層202、導波路コア層103b、および上部クラッド層204を順次積層した構造を有している。なお、基板201、下部クラッド層202、および上部クラッド層204の材料は、DFBレーザ211と同一である。
図18に示すように、SOA231は、基板201上に、下部クラッド層202、導波路コア層203c、および上部クラッド層204を順次積層した構造を有している。なお、基板201、下部クラッド層202、および上部クラッド層204の材料は、DFBレーザ211と同一である。
図19に示すように、端面窓構造部232は、基板201上に、下部クラッド層202、下部埋め込みクラッド層206、上部埋め込みクラッド層207、および上部クラッド層204を順次積層した構造を有している。なお、基板201、下部クラッド層202、下部埋め込みクラッド層206、上部埋め込みクラッド層207、および上部クラッド層204の材料は、DFBレーザ211と同一である。
次に、本実施形態の半導体光集積素子200の製造方法を説明する。なお、本実施形態の半導体光集積素子200の製造方法は、第1実施形態の半導体光集積素子100の製造方法と同様なので、適宜説明を省略するものとする。
以下では、本実施形態に係る半導体光集積素子200の特性について、随時比較例を示しながら説明する。
101,201 基板
102,202 下部クラッド層
103a,103b,103c,203a,203b,203c 導波路コア層
104,204 上部クラッド層
105,205 エッチング停止層
106,206 下部埋め込みクラッド層
107,207 上部埋め込みクラッド層
108,208 コンタクト層
109,209 p電極
110,130,210,230 埋め込み型導波路部
111,131 SSC
112,231 SOA
120,220 メサ型導波路部
121 変調器
141,241 パシベーション膜
142 低誘電率層
211 DFBレーザ
221 AWG
232 端面窓構造部
Claims (10)
- 基板上に、少なくとも下部クラッド層、導波路コア層、および上部クラッド層を順次積層した半導体光集積素子であって、
前記導波路コア層の両側近傍に半導体クラッド材料が埋め込まれた導波路構造を有する埋め込み型導波路部と、
前記上部クラッド層を少なくとも含む半導体層がメサ状に突出した導波路構造を有するメサ型導波路部と、を備え、
前記埋め込み型導波路部における上部クラッド層の厚さは、前記メサ型導波路部における上部クラッド層の厚さよりも厚く、
前記埋め込み型導波路部の前記上部クラッド層に、前記上部クラッド層とはエッチング耐性が異なり、エッチング速度が前記上部クラッド層よりも遅い中間層が挿入されている
ことを特徴とする半導体光集積素子。 - 前記メサ型導波路部は、前記導波路コア層を含む半導体層がメサ状に突出したハイメサ型の導波路構造を有することを特徴とする請求項1に記載の半導体光集積素子。
- 前記埋め込み型導波路部に隣接した領域に、前記導波路コア層の代わりに半導体クラッド材料が充たしている窓構造を有する端面窓構造部をさらに備えることを特徴とする請求項1または請求項2に記載の半導体光集積素子。
- 前記埋め込み型導波路部は、導波路を伝播する光のスポットサイズを漸次変換するスポットサイズ変換器であることを特徴とする請求項1〜3のいずれか1つに記載の半導体光集積素子。
- 前記埋め込み型導波路部における導波路コア層は、前記メサ型導波路部における導波路コア層よりも薄いことを特徴とする請求項1〜4のいずれか1つに記載の半導体光集積素子。
- 前記中間層は、エッチング停止層であることを特徴とする請求項1〜5のいずれか1つに記載の半導体光集積素子。
- 前記埋め込み型導波路部には少なくとも光増幅器が設けられ、前記メサ型導波路部には少なくとも変調器が設けられていることを特徴とする請求項1〜6のいずれか1つに記載の半導体光集積素子。
- 前記埋め込み型導波路部には少なくとも複数のレーザ発振器が設けられ、前記メサ型導波路部には少なくともアレイ導波路回折格子が設けられていることを特徴とする請求項1〜6のいずれか1つに記載の半導体光集積素子。
- 埋め込み型導波路部とメサ型導波路部とを有する半導体光集積素子の製造方法であって、
前記埋め込み型導波路部および前記メサ型導波路部を形成する領域において、基板上に、少なくとも下部クラッド層および導波路コア層を積層する第1工程と、
前記埋め込み型導波路部を形成する領域における導波路コア層を含む半導体層をメサ状にエッチングする第2工程と、
前記埋め込み型導波路部を形成する領域の導波路コア層の両側近傍に半導体クラッド材料を埋め込む第3工程と、
前記埋め込み型導波路部および前記メサ型導波路部を形成する領域において、上部クラッド層を少なくとも含む半導体層を積層する第4工程と、
前記メサ型導波路部を形成する領域における前記上部クラッド層の一部をエッチングにより除去する第5工程と、
前記メサ型導波路部を形成する領域における導波路コア層の両側を除去して前記上部クラッド層を少なくとも含む半導体層をメサ状にエッチングする第6工程と、
をこの順番に含み、
前記第4工程は、前記第5工程のエッチングを停止するための、前記上部クラッド層とはエッチング耐性が異なるエッチング停止層を挿入する工程を含む
ことを特徴とする半導体光集積素子の製造方法。 - 前記第5工程と前記第6工程との間に、コンタクト層を前記上部クラッド層上に積層する工程をさらに含むことを特徴とする請求項9に記載の半導体光集積素子の製造方法。
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