Author(s): Wang, J (Wang, Jian); Chen, B (Chen, Bei); Ban, DC (Ban, Dechao); Jin, Y (Jin, Ya); Cao, KQ (Cao, Keqi); Zhang, CW (Zhang, Chenwei); Xu, CD (Xu, Changda); Wang, WT (Wang, Wenting); Liu, Y (Liu, Yu); Li, M (Li, Ming); Zhu, NH (Zhu, Ninghua)

Source: IEEE PHOTONICS TECHNOLOGY LETTERS Volume: 36  Issue: 6 Pages: 437-440  DOI: 10.1109/LPT.2024.3367299  Published: MAR 15 2024 

Abstract: A widely tunable narrow-linewidth laser consisting of a sampled-grating distributed Bragg reflector (SG-DBR) laser and an external silica-based multi-period-delayed feedback (MPDF) photonic circuit is fabricated and experimentally demonstrated. The measured results show that a 58-nm lasing wavelength tuning range together with a more than 40 dB side-mode suppression ratio can be achieved. Notably, among the wavelength tuning range, all linewidths remain below 1 kHz, which are narrowed by more than three orders of magnitude compared to the average intrinsic linewidth of 3 MHz for the original SG-DBR laser. Besides, since the proposed MPDF structure has an ultra-dense distribution of the multi-period feedback, the linewidth reduction capability can be maintained over the entire operating wavelength range does not require free spectral range (FSR)-alignment or any extra phase match. Such widely tunable narrow-linewidth laser might offer a compact, cost-effective and easily-implemented solution for next-generation applications including ultra-wideband dense wavelength division multiplexing (DWDM) systems and light detection and ranging (LiDAR) systems.

Accession Number: WOS:001173109600001

Author Identifiers:

Author Web of Science ResearcherID     ORCID Number

Li, Ming      0000-0001-8959-9619

ISSN: 1041-1135

eISSN: 1941-0174