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Abstract
SSG-DBRレーザは電流注入・プラズマ効果型の高速波長可変レーザでナノ秒オーダの応答速度が得られる.したがって,WDM用波長パス切換え用光源はもとより,医科向けのOCT用高速波長掃引光源としても有望視されている.これまで,プラズマ効果型デバイスには電流注入によるジュール熱により素子温度が変動し,秒オーダの波長ずれを伴う課題があった.そこで我々は熱補償用のヒータ構造を集積し素子に投入する電力を正確に制御することで,発振周波数を6.25GHzステップで切換え,4個の波長帯SSG-DBRレーザの同時駆動により17.5THz (140nm)の広帯域にわたり波長ずれの無い周波数掃引を実現した.
SSG-DBR-LD is attractive for various applications in, for example, WDM systems and medical OCT systems, because of its fast and wide wavelength tuning characteristics. However, the tuning speed was actually limited to seconds by a thermal drift. In this work, we introduced a thermal drift compensator into SSG-DBR-LD, and suppressed the drift. We achieved an accurate and wide wavelength sweep of more than 140nm by synchronously driving four SSG-DBR-LDs.
Journal
- Technical report of IEICE. OPE [List of Volumes]
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Technical report of IEICE. OPE 108(260), 149-152, 2008-10-16 [Table of Contents]
The Institute of Electronics, Information and Communication Engineers