Metasurfaces are two-dimensional planar structures composed of artificial atoms with special electromagnetic properties in a certain arrangement, which can flexibly control the amplitude, phase, and polarization of incident light, and have strong light field manipulation capabilities, so they have attracted extensive attention. In this work, a WDM based on all- dielectric metasurface is proposed to realize the beam combination function of ultra-wideband signal and narrowband pumping. The WDM can realize the low-loss and high-efficiency wavelength division multiplexing function of one ultra- wideband signal and one or two narrowband pumps by punching holes in the fused silica thin layer, with a signal passing bandwidth of more than 400nm, almost no energy loss on the signal wavelength, a pump loss of less than 1dB, and a pump occupied bandwidth of less than 3nm. It can well solve the problem of serious limitation of signal bandwidth of the current wavelength division multiplexer and provide important support for the key components and equipment of ultra-high bandwidth optical communication such as ultra-high bandwidth optical fiber amplifiers.
In this paper, a polarization splitting square fiber is designed to make up for some defects of Dtype fiber in common fiber devices. Compared with D-type optical fiber, square-type optical fiber can be directly drawn by processing the optical fiber preform. Thereby eliminating the need to process the micron-level optical fiber, while maintain the original core-cladding structure. Most of the optical field energy is still limited to the core, which can greatly reduce the insertion loss of the devices. Using the finite element method, the half-length core distance (30 to 90 microns), radius of arc (1 to 9 microns), numerical aperture (0.18 to 0.24) and isolation thickness (0.1 to 2 microns) of the square fiber are optimized. Theoretical calculation results show that under the optimal parameters, the mode loss of our designed square fiber under X polarization is 0.0179dB/mm. And under Y polarization, the mode loss is 0.0454dB/mm. In addition, the mode mismatch loss is 7.506%. This value will reduce the mode loss by 100 times compared with D-type fiber and make full use of the advantages of good coupling to the allfiber system.
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