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We demonstrate a compact erbium-doped fiber ring laser mode-locked by a WS 2 saturable absorber (SA), which operates in the telecommunication L-band. The monolayer WS 2 is synthesized by an enhanced chemical vapor deposition (CVD) method and transferred onto the end face of a fiber connector to form a fiber-compatible WS 2 SA. Stable soliton pulses centered at 1602.2 nm with a pulse duration of 1.19 ps are achieved in the laser. Our research results show that monolayer WS 2 is a promising material for L-band ultrashort pulse generation.

In the management of capital assets owned by major enterprise, there exist some information disconnection including no information about equipment working conditions when bidding for them, no information about installation and debugging when the equipment was overhauled. Therefore, the paper proposes to establish a equipment management system based on BOM tree and RFID. Giving asset devices lifetime identity through RFID coding, which will be utilized throughout all procedures including planning and designing, bidding and procurement, construction building and so on. The paper develops some apps, such as engineering construction, warehouse management to realize data circulation throughout the equipment. Besides, with data analysis, the paper carries on equipment unit cost allocation and collection and supplier comprehensive evaluation, to guide equipment procurement and management, strengthen the whole process monitoring of asset operation status, improve the management level of asset lean management, and optimize the asset operation strategy of the company.

We report on ultrafast-pulse generation in an erbium-doped fiber ring laser mode-locked by a graphene/WS 2 van der Waals heterostructure saturable absorber. Atomic-layered WS 2 is first synthesized on SiO 2 /Si substrate by the chemical vapor deposition (CVD) method, and then graphene/WS 2 heterostructure is fabricated by transferring graphene onto the CVD-grown layered WS 2 . Taking advantage of excellent saturable absorption properties of the fabricated graphene/WS 2 heterostructure, stable soliton pulses are successfully generated in the laser with a 3-dB spectral width of 2.3 nm and a pulse duration of 1.12 ps. Numerical simulations reproduce the mode-locked pulse emission in the experiment. Our research provides a new insight for tailoring versatile two-dimensional heterostructures so as to develop ultrafast photonic applications.