Switchable and tunable multiple-channel erbium-doped fiber laser using graphene-polymer nanocomposite and asymmetric two-stage fiber Sagnac loop filter

Min Zhou; Zhengqian Luo; Zhiping Cai; Chenchun Ye; Huiying Xu; Jinzhang Wang

doi:10.1364/AO.50.002940

Switchable and tunable multiple-channel erbium-doped fiber laser using graphene-polymer nanocomposite and asymmetric two-stage fiber Sagnac loop filter

Appl Opt. 2011 Jun 20;50(18):2940-8. doi: 10.1364/AO.50.002940.

Authors

Min Zhou¹, Zhengqian Luo, Zhiping Cai, Chenchun Ye, Huiying Xu, Jinzhang Wang

Affiliation

¹ Institute of Optoelectronic Technology, Department of Electronic Engineering, Xiamen University, Xiamen 361005, China.

PMID: 21691359
DOI: 10.1364/AO.50.002940

Abstract

A high-performance multiple-channel erbium-doped fiber laser (EDFL) is proposed and experimentally demonstrated, using graphene-polymer nanocomposite as a multiwavelength equalizer and an asymmetric two-stage polarization-maintaining fiber (PMF) Sagnac loop as a flexible comb filter. At first, the filtering characteristics of the PMF Sagnac loop filter (SLF) are investigated. Both theoretical and experimental results show that it can provide a flexibly switchable and tunable comblike filtering. Then, the two-stage PMF SLF is inserted into a graphene-assisted EDFL cavity for generating multiwavelength oscillation. The extreme-high third-order optical nonlinearity of graphene is exploited to suppress the mode competition of the EDFL, and a stable multiple-channel lasing is observed. By carefully adjusting the polarization controllers in the two-stage PMF SLF, not only can the lasing-line number per channel be switchable between single and multiple wavelengths, but also the wavelength spacing in the triple-wavelength condition can be tunable. In the case of triple wavelengths per channel, up to 12 wavelengths with four channels stable oscillations can be achieved. The multiple-channel EDFL can keep a high extinction ratio of >40 dB and a narrow linewidth of <0.01 nm.