Chirped Microwave Signals Generation Using a Distributed Feedback Laser With Alternating Structure of Active- and Passive-Cavity
Author(s): Xu, CD (Xu, Changda); Jin, Y (Jin, Ya); Wang, J (Wang, Jian); Sun, WH (Sun, Wenhui); Xiong, LM (Xiong, Liangming); Chen, YF (Chen, Yinfang); Chen, W (Chen, Wei); Zhu, NH (Zhu, Ninghua)
Source: IEEE PHOTONICS JOURNAL Volume: 13 Issue: 4 Article Number: 1500906 DOI: 10.1109/JPHOT.2021.3103008 Published: AUG 2021
Abstract: We proposed a new type of distributed feedback laser with alternating active- and passive-cavities (APC DFB), which enjoys the same quantum well layer where the butt-joint re-growth process can be avoided. By utilizing the chirp characteristics of the APC DFB laser in a delayed self-heterodyne system, a chirped microwave signal with a sweep range up to 40 GHz and a sweep period of 25 mu s is generated. The power fluctuation of the generated signal between 0-40 GHz within 30 minutes does not exceed 3 dB, and the scanning range fluctuates about 600 MHz. And experiment results show that the thermal efficiency of the current is always related to the working environment. In the static wavelength measurement, it is controlled by the injection current; when the chirped signal is generated, it is determined by the bias current. In particular, the waveform and the period as well as the sweep range of the generated chirped microwave signals can be accurately tuned by adjusting the modulating current, which has provided a deeper insight into the photonic generation of microwave signals.
Accession Number: WOS:000698686800001