Temperature control tunable optical fiber filter based on micro-nano optical fibers and manufacturing method

Abstract

The invention relates to a temperature control tunable optical fiber filter based on a micro-nano optical fiber and manufacturing method. The temperature control tunable optical fiber filter is characterized in that the filter at least includes a micro-nano optical fiber (1) and a planar optical waveguide (2), the micro-nano optical fiber (1) is manufactured with a single-mode optical fiber (3) into a structure in which diameters of the two ends are unchanged and the middle is a micro-nano waist region through a fused biconical taper process, the length of the thin waist region is at least larger than or equal to that of the planar optical waveguide (2), and the micro-nano optical fiber (1) and the planar optical waveguide (2) are pasted through an optical adhesive (4) to manufacture a waveguide coupling structure. The filter proposed by the invention is of an all-optical fiber structure, optical transmission loss is low, and filtering stability is high. Bandpass and band-stop filtering tuning in a relatively wide range can be realized through change of temperature, the repeatability is relatively high, and extra complex wavelength calibration equipment is not needed.

Description

technical field [0001] The invention belongs to the field of optical fiber technology and optical filtering technology, and in particular relates to a temperature-controlled tunable optical fiber filter based on micro-nano optical fiber and a manufacturing method thereof. Background technique [0002] An optical filter is a wavelength selective device that only allows specific wavelength or frequency components in an optical signal to pass through, while other wavelength components are greatly attenuated. According to different filtering characteristics, optical filters can be divided into two types: fixed wavelength filters and tunable filters. Fixed wavelength filters allow a fixed, predetermined wavelength to pass, while tunable filters dynamically select the wavelength or bandwidth to pass. Due to the advantages of tunable wavelength, wide filtering range, low insertion loss and easy connection with other optical devices, tunable optical fiber filters have become a key ...

AI Technical Summary

Problems solved by technology

However, due to the hysteresis, nonlinearity and zero-point drift of piezoelectric ceramics, the stability and repeatability of F-P tunable filters are poor

Usually, an additional wavelength standard instrument is required for further calibration, and the system structure is more complicated

In addition, the F-P interferometer has very high requirements on the surface flatness, coating accuracy, mirror reflectivity and parallelism between the two mirrors, and the optical processing is more difficult.

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