Ultracompact fiber laser based on a highly integrated optical device
The ultrafast fiber laser has attracted a great deal of research interest due to its low cost, high efficiency, and simple maintenance. Optical passive devices are vital parts of a fiber laser. In order to obtain a fiber laser with high quality, optical passive devices with high performance are required. Here, we demonstrate a highly integrated optical device with the combination of a saturable absorber (SA), coupler, isolator, wavelength division multiplexer, and erbium-doped fiber. The built-in SA has a modulation depth of 7% and can withstand high pump power due to the unique structure of the proposed device. The proposed device is applied to an ultracompact fiber laser, which greatly simplifies the laser structure and reduces the size of the proposed laser. The central wavelength, pulse duration, repetition rate, and signal-to-noise ratio of the output soliton are 1560 nm, 1.06 ps, 25.8 MHz, and 50 dB, respectively. The proposed device has great potential for application in high-power and high-frequency fiber lasers. The proposed ultracompact fiber laser has important applications in optical communication, optical sensing, optical frequency combs, and micromachining.
基金项目：National Natural Science Foundation of China (NSFC)10.13039/501100001809 (61525505, 11774310, 61805212); China Postdoctoral Science Foundation10.13039/501100002858 (2017M621918); Key Scientific and Technological Innovation Team Project in Shaanxi Province (2015KCT-06).
Xueming Liu：State Key Laboratory of Modern Optical Instrumentation, Department of Optical Engineering, Zhejiang University, Hangzhou 310027, China
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Xiaoxiang Han and Xueming Liu, "Ultracompact fiber laser based on a highly integrated optical device," Photonics Research 7(1), 36-41 (2019)