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Optical Engineering

Experimental demonstration of a flat optical frequency comb generation based on cascaded directly modulated distributed feedback laser and polarization modulator
Author(s): Dalei Chen; Rong Wang; Tao Pu; Peng Xiang; Tao Fang; Jiling Zheng; Long Huang; Peng Wang
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Paper 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.

Paper Details

Date Published: 20 October 2015
PDF: 5 pages
Opt. Eng. 55(3) 031112 doi: 10.1117/1.OE.55.3.031112
Published in: Optical Engineering Volume 55, Issue 3
Show Author Affiliations
Dalei Chen, The PLA Univ. of Science and Technology (China)
Rong Wang, The PLA Univ. of Science and Technology (China)
Tao Pu, The PLA Univ. of Science and Technology (China)
Peng Xiang, The PLA Univ. of Science and Technology (China)
Tao Fang, The PLA Univ. of Science and Technology (China)
Jiling Zheng, The PLA Univ. of Science and Technology (China)
Long Huang, Nanjing Univ. (China)
Peng Wang, Nanjing Univ. (China)


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