Author(s): Gao, X (Gao, Xu); Yang, K (Yang, Ke); Zhu, YX (Zhu, Yixuan); Guo, K (Guo, Kai); Zhai, SQ (Zhai, Shenqiang); Zhuo, N (Zhuo, Ning); Li, Y (Li, Yuan); Zhang, JC (Zhang, Jinchuan); Wang, LJ (Wang, Lijun); Liu, SM (Liu, Shuman); Liu, FQ (Liu, Fengqi); Wei, ZP (Wei, Zhipeng); Wang, XH (Wang, Xiaohua); Liu, JQ (Liu, Junqi)

Source: IEEE ELECTRON DEVICE LETTERS Volume: 45  Issue: 4  Pages: 649-652  DOI: 10.1109/LED.2024.3368411  Published Date: 2024 APR  

Abstract: In this letter, we proposed a kind of high-bandwidth directly modulated quantum cascade laser (QCL) at similar to 8.5 mu m by optoelectronic fusion integration technology. Multi-physics collaborative buried heterojunction (BH) QCL with a tri-terminal coplanar electrode is monolithically integrated with a grounded coplanar waveguide (GCPW) transmission line. Through precise control of each parasitic parameter, has enabled our 2-mm-long and 7.8- mu m -wide QCL to achieve an impressive -3 dB electrical modulation bandwidth of 16.5 GHz in a microwave rectification scheme. Simultaneously, it maintains a continuous wave (CW) output power of 91 mW at room temperature. Additionally, for a 2-mm-long and 11.5- mu m -wide QCL, we reach a -3 dB electrical modulation bandwidth up to 23.9 GHz and a cutoff frequency exceeding 30 GHz. These promising results indicate that the device has the potential to be a valuable candidate for applications in mid-wave infrared (MWIR) free-space optical communication (FSOC), among others.