Main > Photonics Research >  Volume 8 >  Issue 5 >  Page 05000671 > Article
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• Received: Oct. 21, 2019

Accepted: Feb. 23, 2020

Posted: Feb. 25, 2020

Published Online: Apr. 22, 2020

The Author Email: Weihua Guo (guow@mail.hust.edu.cn)

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Quanan Chen, Chun Jiang, Kuankuan Wang, Miao Zhang, Xiang Ma, Ye Liu, Qiaoyin Lu, Weihua Guo. Narrow-linewidth thermally tuned multi-channel interference widely tunable semiconductor laser with thermal tuning power below 50 mW[J]. Photonics Research, 2020, 8(5): 05000671

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## Abstract

A thermally tuned multi-channel interference widely tunable semiconductor laser is designed and demonstrated, for the first time to our knowledge, that realizes a tuning range of more than 45 nm, side-mode suppression ratios up to 56 dB, and Lorentzian linewidth below 160 kHz. AlGaInAs multiple quantum wells (MQWs) were used to reduce linewidth, which have a lower linewidth enhancement factor compared with InGaAsP MQWs. To decrease the power consumption of micro-heaters, air gaps were fabricated below the arm phase sections. For a 75 μm long suspended thermal tuning waveguide, about 6.3 mW micro-heater tuning power is needed for a $2π$ round-trip phase change. Total micro-heater tuning power required is less than 50 mW across the whole tuning range, which is lower than that of the reported thermally tuned tunable semiconductor lasers.