[Optics Letter] Optofluidic tunable mode-locked fiber laser using a long-period grating integrated m
An optofluidic tunable mode-locked fiber laser using a microfluidic chip integrated with long-period grating (LPG) is presented. The microfluidic chip enables ultrafine adjustment of the liquid’s refractive index and, thus, LPG’s spectrum via tuning the mixing ratio of the microfluidic flows. With such an optofluidic spectrum-tunable filter, the central wavelength of the mode-locked laser can be tuned continuously, while the mode-locking state is steadily maintained. The mode-locked pulses are measured with a pulse duration of 0.9 ps and repetition rate of 12.14 MHz, respectively. Moreover, bound solitons with variable soliton separations are experimentally demonstrated.
Jie Wang,1,2 Mian Yao,1,3 Chengzhi Hu,1,2 A. Ping Zhang,1,* Yonghang Shen,2 Hwa-yaw Tam,1 and P. K. A. Wai3
1Photonics Research Center, Department of Electrical Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong SAR, China
2State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, Zhejiang University, Hangzhou 310027, China
3Photonics Research Center, Department of Electronic and Information Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong SAR, China
*Corresponding author: firstname.lastname@example.org
Optics Letters Vol. 42, Issue 6, pp. 1117-1120 (2017) •https://doi.org/10.1364/OL.42.001117