Optically tunable mode-locked fiber laser using long-period grating coated with multiwall carbon nanotubes

Author:

Jiang Chen1ORCID,Wan Ying2ORCID,Yun Ling1ORCID,Ma Yuehui3,Chen Siyu3,Sun Bing1ORCID,Dai Lilong3,Mou Chengbo3ORCID,Liu Yunqi3ORCID,Zhang Zuxing1ORCID

Affiliation:

1. Advanced Photonic Technology Lab, College of Electronic and Optical Engineering and College of Flexible Electronics (Future Technology), Nanjing University of Posts and Telecommunications 1 , 9 Wenyuan Road, Nanjing 210023, China

2. The School of Physics and Optoelectronic Engineering, Nanjing University of Information Science and Technology 2 , 219 Ningliu Road, Nanjing 210044, China

3. The Key Laboratory of Specialty Fiber Optics and Optical Access Networks, Joint International Research Laboratory of Specialty Fiber Optics and Advanced Communication, Shanghai Institute for Advanced Communication and Data Science, Shanghai University 3 , Shanghai 200444, China

Abstract

We demonstrate an optically tunable mode-locked fiber laser using long-period fiber grating (LPFG) coated with multi-walled carbon nanotubes (CNTs). The multi-walled CNTs can absorb light to convert it into thermal energy, and the resonance wavelength of the grating can be easily turned by varying the external modulated light power. This multi-walled CNT coated LPFG-based all-optical fast and efficient spectrum tunable filter enables continuous tuning of the central wavelength of the laser by manipulating the loss of the mode-locked laser, ensuring the stability of the mode-locking state. In the absence of modulated light on multi-walled CNTs, the soliton laser could generate 890 fs pulses at 1546.7 nm with a spectrum bandwidth of 3.26 nm and a signal-to-noise ratio of 73.1 dB. Through adjustment of the pump power of the modulation light on multi-walled CNTs, the mode-locked fiber laser can be continuously tuned from 1546.71 to 1563.15 nm. The response time of the optically tunable system was measured to be in the order of hundreds of milliseconds. The presented optical tuning filter shows great potential in the fiber laser system, offering a repeatable, straightforward, and rapidly responsive laser tuning technique.

Funder

National Science Foundation of China

Natural Science Research Startup Foundation of Recruiting Talents of Nanjing University of Posts and Telecommunications

Science and Technology Commission of Shanghai Municipality

Startup Foundation for Introducing Talent of Nanjing University of Information Science and Technology

Natural Science Research of Jiangsu Higher Education Institutions of China

1311 Talent Plan of Nanjing University of Posts and Telecommunications

Publisher

AIP Publishing

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