Author(s): Xiao, Ye; Meng, Yao; Hao, Tengfei; Shi, Nuannuan; Li, Wei; Li, Ming

Source:OPTICS EXPRESS Volume:29 Issue:24 Page:39874 - 39884 DOI:10.1364/OE.445538 Published:NOV 22 2021

Abstract: Optical frequency comb (OFC), a periodic optical pulse train in time domain, has been widely employed to measure optical frequency due to its equidistant modes in the frequency domain. Here, we propose and demonstrate a novel optical spectrum analyzer for CW lasers based on stretching the OFC in a dispersive element and mapping the frequency comb into the time domain. The optical spectrum analyzer also provides instantaneous full-field (wavelength, amplitude and phase) optical characterization capability by combining with optical phase-diversity technology. Experimental results show that we successfully trace the evolution of modulated lasers with a measurement speed of similar to 51 MHz (related to the pulse repetition of the OFC) and a high spectral resolution of similar to 21 pm. Thanks to the use of wavelength-to-time mapping and OFC, the single channel measurement range of the proposed system can reach similar to 10 nm, which breaks the restriction of the bandwidth of photodetector. (C) 2021 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement

Accession Number:WOS:000722251200076

ISSN: 1094-4087

Full Text: https://www.osapublishing.org/oe/fulltext.cfm?uri=oe-29-24-39874&id=464851