JP4912387B2 - 非線形光素子 - Google Patents
非線形光素子 Download PDFInfo
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- JP4912387B2 JP4912387B2 JP2008302828A JP2008302828A JP4912387B2 JP 4912387 B2 JP4912387 B2 JP 4912387B2 JP 2008302828 A JP2008302828 A JP 2008302828A JP 2008302828 A JP2008302828 A JP 2008302828A JP 4912387 B2 JP4912387 B2 JP 4912387B2
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- nonlinear optical
- optical element
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- nonlinear
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Description
図5に、本発明の一実施形態に係る非線形光素子であるデューティ比の制御された多重周期QPM−LN素子10を備えた波長変換装置の構成を示す。波長変換装置11は、多重周期QPM−LN素子10へ入力する信号光1の発生装置、および励起光2の発生装置を含む。
分極反転ペアのデューティ比を制御する実施形態1と同様に変換効率とリップル値とをバランスさせる効果を有する、多重周期QPM−LN素子10の周期構造の別の設定方法について説明する。
2 励起光
3 SHG光
4 変換光
5 合波器
6 QPM−LM素子
7 非変換光
8 分波器
9 光導波路
10 多重周期QPM−LM素子
11 波長変換装置
12 光源
13 変調器
14 光ファイバ
15 波長可変光源
16 光増幅器
17 光カプラ
18 波長フィルタ
Claims (8)
- 2次非線形定数の符号が光の進行方向に対して周期的に反転した基本周期Λ0の周期構造を有する非線形光学媒質を有し、且つ、前記周期構造の位相変化を与える関数が周期Λphごとに繰り返されている非線形光素子であって、次式
前記非線形光素子の周期構造は、
前記非線形光素子の隣り合った符号の異なる2次非線形定数を有する2つの領域を1つの分極反転ペアとしたときの、前記分極反転ペアの一方の符号の領域長と両方の符号の領域を含む分極反転ペア長の比であるデューティ比を、前記非線形光素子の全てのペアのデューティ比を表す制御関数であって、前記非線形光素子の両端の前記ペアから中心の前記ペアに向かってデューティ比が双曲正接型関数的に増大する制御関数と、
前記3波長λ1、λ2、λ3の媒質中の屈折率をそれぞれn1、n2、n3として、次式
に基づき設定されたことを特徴とする非線形光素子。 - 2次非線形定数の符号が光の進行方向に対して周期的に反転した基本周期Λ0の周期構造を有する非線形光学媒質を有し、且つ、前記周期構造の位相変化を与える関数が周期Λphごとに繰り返されている非線形光素子であって、次式
前記非線形光素子の周期構造は、
前記非線形光素子全体の2次非線形定数の平均的分布を表す制御関数であって、前記非線形光素子の両端付近において2次非線形定数の一方の符号を持つ複数の領域のうち、一部の領域の符号を選択的に反転させ、前記非線形光素子の中心に近づくにつれて符号反転の頻度を低減するような双曲正接型関数である制御関数と、
前記3波長λ1、λ2、λ3の媒質の屈折率をそれぞれn1、n2、n3として、次式
に基づき設定されたことを特徴とする非線形光素子。 - 前記パラメータaは前記ピーク間に生じるリップル値を最小化するように設定されたことを特徴とする請求項3又は6に記載の非線形光素子。
- 前記非線形光学媒質としてLiNbO3、KNbO3、LiTaO3、KTiOPO4、LiNbXTa1-XO3(0≦x≦1)、およびそれらにMg、Zn、In、Scから選ばれた少なくとも一種類の元素を添加した材料を使用することを特徴とする請求項1乃至7の何れか1項に記載の非線形光素子。
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JP4912387B2 true JP4912387B2 (ja) | 2012-04-11 |
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Families Citing this family (2)
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JP2012118333A (ja) * | 2010-12-01 | 2012-06-21 | Nippon Telegr & Teleph Corp <Ntt> | 波長変換素子 |
JP5421230B2 (ja) * | 2010-12-03 | 2014-02-19 | 日本電信電話株式会社 | 波長変換デバイス及び波長変換装置 |
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JP3971660B2 (ja) * | 2002-06-14 | 2007-09-05 | 日本電信電話株式会社 | 波長変換素子および波長変換装置 |
JP2008089762A (ja) * | 2006-09-29 | 2008-04-17 | Nippon Telegr & Teleph Corp <Ntt> | 波長変換素子および波長変換装置 |
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