Special Section on Microwave Photonics: Deep Interactions between Microwaves and Lightwaves

Experimental demonstration of a flat optical frequency comb generation based on cascaded directly modulated distributed feedback laser and polarization modulator

[+] Author Affiliations
Dalei Chen, Rong Wang, Tao Pu, Peng Xiang, Tao Fang, Jiling Zheng

PLA University of Science and Technology, College of Communications Engineering, Nanjing, Jiangsu 210007, China

Long Huang, Peng Wang

Nanjing University, College of Engineering and Applied Sciences, Nanjing, Jiangsu 210093, China

Opt. Eng. 55(3), 031112 (Oct 20, 2015). doi:10.1117/1.OE.55.3.031112
History: Received April 28, 2015; Accepted September 11, 2015
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Abstract.  A scheme to generate a flat optical frequency comb (OFC) is proposed and experimentally demonstrated based on a directly modulated distributed feedback (DFB) laser cascaded with a polarization modulator (PolM). In the proposed scheme, the DFB laser is optically injection-locked by a tunable laser source and directly modulated by a radio frequency (RF) signal, which is amplified by a microwave power amplifier. The optical signal is then sent to PolM via a polarization controller (PC) and modulated by the amplified and phase-shifted RF signal from the same source. The optical signal is finally received and measured by an optical spectrum analyzer (OSA) after transmitting through another PC and a polarizer. Here, the OFC with their power variation within 3 dB is desired, and four OFCs with 6, 6, 5, and 4 comb lines are generated using the RF signals with different frequencies, which have a flatness of, respectively, 2.4, 2.5, 0.7, and 0.6 dB. Here, the number of comb lines is decreased, which is due to the RF signal power decrease while its frequency is raised.

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© 2015 Society of Photo-Optical Instrumentation Engineers

Citation

Dalei Chen ; Rong Wang ; Tao Pu ; Peng Xiang ; Tao Fang, et al.
"Experimental demonstration of a flat optical frequency comb generation based on cascaded directly modulated distributed feedback laser and polarization modulator", Opt. Eng. 55(3), 031112 (Oct 20, 2015). ; http://dx.doi.org/10.1117/1.OE.55.3.031112


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