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

Dalei Chen; Rong Wang; Tao Pu; Peng Xiang; Tao Fang; Jiling Zheng; Long Huang; Peng Wang

doi:10.1117/1.OE.55.3.031112

20 October 2015 Experimental demonstration of a flat optical frequency comb generation based on cascaded directly modulated distributed feedback laser and polarization modulator

Dalei Chen, Rong Wang, Tao Pu, Peng Xiang, Tao Fang, Jiling Zheng, Long Huang, Peng Wang

Author Affiliations +

Optical Engineering, Vol. 55, Issue 3, 031112 (October 2015). https://doi.org/10.1117/1.OE.55.3.031112

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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Dalei Chen, Rong Wang, Tao Pu, Peng Xiang, Tao Fang, Jiling Zheng, Long Huang, and Peng Wang "Experimental demonstration of a flat optical frequency comb generation based on cascaded directly modulated distributed feedback laser and polarization modulator," Optical Engineering 55(3), 031112 (20 October 2015). https://doi.org/10.1117/1.OE.55.3.031112

Published: 20 October 2015

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