Affiliation of Author(s):电子信息工程学院
Journal:2017 INTERNATIONAL TOPICAL MEETING ON MICROWAVE PHOTONICS (MWP)
Key Words:Linear frequency modulation optoelectronic oscillator semiconductor laser
Abstract:A photonic linear frequency-modulated (LFM) microwave waveform generator is proposed and demonstrated using a tunable optoelectronic oscillator (OEO) based on an optically injected semiconductor laser. Frequency tunability of the OEO is achieved by controlling optical injection strength. When the sweep period of output frequency matches with the cavity round-trip time, signal quality of generated LFM waveform is significantly improved by the high Q optoelectronic oscillation. In the experiment, LFM signal with a sweep range as large as 7 GHz, a tuning rate reaching 0.18 GHz/ns, and a time-bandwidth product (TBWP) up to 2804.2 is generated. A frequency comb contrast of 47 dB is also observed in the spectrum. Compared with other approaches, the proposed LFM waveform generator shows superiorities of large bandwidth, fast sweeping rate and high spectral purity.
Translation or Not:no
Date of Publication:2017-01-01
Co-author:周沛,Guo, Qingshui,Shilong PAN
Correspondence Author:张方正,潘时龙,zfz
Date of Publication:2017-01-01