JP2015092558A - 光半導体装置の制御方法 - Google Patents
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Abstract
Description
L1=L3+(L2−L3)×K1(0.3≦K1≦0.7) (1)
P1=P3×Rth3/Rth1+(P2×Rth2/Rth1−P3×Rth3/Rth1)×K1+オフセット量(≠0) (2)
L1=L3+(L2−L3)×K1(0.3≦K1≦0.7) (1)
P1=P3×Rth3/Rth1+(P2×Rth2/Rth1−P3×Rth3/Rth1)×K1×(1+補正係数(≠1)) (2)
L1=L3+(L2−L3)×K1 (1)
なお、K1=0.5の場合、L1=(L2+L3)/2となる。
ここで、CSG−DBR領域Bの3個のヒータ10a〜10cの温度制御に関る比較例について説明する。CSG−DBR領域Bの3個のヒータ10a〜10cの温度を制御してセグメントSG1〜SG3の等価屈折率を調整することで、発振する縦モードを選択することができる。コントローラ120は、ヒータ10a〜10cの温度を、セグメントSG1〜SG3の等価屈折率n1〜n3の関係が下記式(2)を満足するように制御する。ただし、Kは0.3≦K≦0.7の範囲の定数である。
n1=n3+(n2−n3)×K (2)
なお、K=0.5の場合、n1=n3+(n2−n3)×0.5=(n3+n2)/2となる。すなわち、セグメントSG1の等価屈折率がセグメントSG2およびセグメントSG4の等価屈折率の平均値となるように制御される。以下、K=0.5を例として説明する。
P1×Rth1=P3×Rth3+(P2×Rth2−P3×Rth3)×0.5=(P2×Rth2+P3×Rth3)/2 (3)
L1=L3+(L2−L3)×K1+L0(≠0) (1)
この場合、比較例に係る制御により各セグメントの等価屈折率が所望の関係になるように各ヒータへの投入電力を設定しても、各セグメント間の干渉効果が小さくなり、レーザ発振が不安定になり易いという問題が生じる。
本実施例においては、コントローラ120は、セグメントSG1〜SG3の等価屈折率をn1〜n3とした場合に、ヒータ10a〜10cを用いて、下記式(4)が成立するようにセグメントSG1〜SG3の等価屈折率を制御する。オフセット量は、半導体レーザ100の波長可変幅が広がるように設定される。
n1=n3+(n2−n3)×K1+オフセット量(≠0) (4)
T1=T3+(T2−T3)×K1+オフセット量(≠0) (5)
P1=P3×Rth3/Rth1+(P2×Rth2/Rth1−P3×Rth3/Rth1)×K1+オフセット量(≠0) (6)
実施例2においては、コントローラ120は、ヒータ10a〜10cへの供給電力をP1〜P3とし、ヒータ10a〜10cの効率(熱抵抗)をRth1〜Rth3とした場合に、下記式(7)が成立するようにヒータ10a〜10cへの電力を制御する。補正係数は、半導体レーザ100の波長可変幅が広がるように設定される。
P1=P3×Rth3/Rth1+(P2×Rth2/Rth1−P3×Rth3/Rth1)×K1×(1+補正係数(≠1)) (7)
2 下クラッド層
3 活性層
4 光導波層
6 上クラッド層
7,20 コンタクト層
8,21 電極
10a〜10c ヒータ
11 電源電極
12 グランド電極
15 裏面電極
16 端面膜
17 反射膜
18 回折格子
19 光増幅層
100 半導体レーザ
200 レーザ装置
Claims (6)
- 回折格子部とそれに隣接し両側が回折格子に挟まれたスペース部からなり、互いに光学長の異なる第1〜第3セグメントが連結されてなるサンプルドグレーティングを備えた光半導体素子と、前記第1〜第3セグメントのそれぞれに対応して設けられた第1〜第3ヒータと、を備え、前記第1〜第3セグメントの光学長をL1〜L3とした場合に、下記式(1)が成立する光半導体装置において、
L1=L3+(L2−L3)×K1(0.3≦K1≦0.7) (1)
前記第1〜第3ヒータへの供給電力をP1〜P3とし、前記第1〜第3ヒータの効率(熱抵抗)をRth1〜Rth3とした場合に、下記式(2)が成立するように前記第1〜第3ヒータへの電力を制御する、光半導体装置の制御方法。
P1=P3×Rth3/Rth1+(P2×Rth2/Rth1−P3×Rth3/Rth1)×K1+オフセット量(≠0) (2) - 前記オフセット量は、あらかじめ複数のオフセット候補を用いて波長に対するSMSRを測定し、波長可変幅が最大となったオフセット候補である、請求項1記載の光半導体装置の制御方法。
- 前記第1〜第3セグメントに光結合する利得領域をさらに備え、
前記第1セグメントは、前記第2および第3セグメントよりも前記利得領域側に近い位置に設けられている、請求項1または2記載の光半導体装置の制御方法。 - 前記第1セグメントの個数は、前記第1および第2セグメントの個数の平均以上である、請求項1〜3のいずれか一項に記載の光半導体装置の制御方法。
- 回折格子部とそれに隣接し両側が回折格子に挟まれたスペース部からなり、互いに光学長の異なる第1〜第3セグメントが連結されてなるサンプルドグレーティングを備えた光半導体素子と、前記第1〜第3セグメントのそれぞれに対応して設けられた第1〜第3ヒータと、を備え、前記第1〜第3セグメントの光学長をL1〜L3とした場合に、下記式(1)が成立する光半導体装置において、
L1=L3+(L2−L3)×K1(0.3≦K1≦0.7) (1)
前記第1〜第3ヒータへの供給電力をP1〜P3とし、前記第1〜第3ヒータの効率(熱抵抗)をRth1〜Rth3とした場合に、下記式(2)が成立するように前記第1〜第3ヒータへの電力を制御する、光半導体装置の制御方法。
P1=P3×Rth3/Rth1+(P2×Rth2/Rth1−P3×Rth3/Rth1)×K1×(1+補正係数(≠1)) (2) - 前記補正係数は、あらかじめ複数の係数候補を用いて波長に対するSMSRを測定し、波長可変幅が最大となった係数候補である、請求項5記載の光半導体装置の制御方法。
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KR102078573B1 (ko) | 2017-01-19 | 2020-02-20 | 한국전자통신연구원 | 분포 브라그 반사형 파장가변 레이저 다이오드 |
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Citations (4)
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JP2008277758A (ja) * | 2007-04-05 | 2008-11-13 | Eudyna Devices Inc | 光半導体装置および光半導体装置の制御方法 |
JP2009177140A (ja) * | 2007-12-28 | 2009-08-06 | Eudyna Devices Inc | 波長可変レーザの試験方法、波長可変レーザの制御方法およびレーザ装置 |
US20100311195A1 (en) * | 2007-05-14 | 2010-12-09 | Finisar Corporation | DBR Laser with Improved Thermal Tuning Efficiency |
JP2014532999A (ja) * | 2011-11-09 | 2014-12-08 | コーニング インコーポレイテッド | 多波長dbrレーザ用加熱素子 |
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US7812594B2 (en) * | 2007-07-19 | 2010-10-12 | Eudyna Devices Inc. | Optical device and method of controlling the same |
JP4943255B2 (ja) * | 2007-07-20 | 2012-05-30 | 住友電工デバイス・イノベーション株式会社 | 半導体レーザの制御方法 |
US7929581B2 (en) * | 2007-12-28 | 2011-04-19 | Eudyna Devices Inc. | Testing method of wavelength-tunable laser, controlling method of wavelength-tunable laser and laser device |
JP6253082B2 (ja) * | 2012-07-31 | 2017-12-27 | 住友電工デバイス・イノベーション株式会社 | 波長可変レーザの制御方法 |
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JP2008277758A (ja) * | 2007-04-05 | 2008-11-13 | Eudyna Devices Inc | 光半導体装置および光半導体装置の制御方法 |
US20100311195A1 (en) * | 2007-05-14 | 2010-12-09 | Finisar Corporation | DBR Laser with Improved Thermal Tuning Efficiency |
JP2009177140A (ja) * | 2007-12-28 | 2009-08-06 | Eudyna Devices Inc | 波長可変レーザの試験方法、波長可変レーザの制御方法およびレーザ装置 |
JP2014532999A (ja) * | 2011-11-09 | 2014-12-08 | コーニング インコーポレイテッド | 多波長dbrレーザ用加熱素子 |
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