Novel cascade type microsphere cavity filter

Abstract

The invention provides a novel cascaded microsphere cavity filter. The filter comprises a broadband laser, an EDFA (erbium-doped fiber amplifier), erbium-doped microspheres, a tapered fiber and an optical coupler, the broadband laser is connected with the input end of the EDFA erbium-doped optical fiber amplifier, the output end of the EDFA erbium-doped optical fiber amplifier is connected with at least one optical fiber, the tail end of each optical fiber is connected with a tapering optical fiber, an erbium-doped microsphere is fixed on the tapering optical fiber, and laser in the erbium-doped microsphere is coupled with the tapering optical fiber and then is selected, superposed and output through the optical coupler. According to the novel cascaded microsphere cavity filter provided by the invention, light with different wavelengths is subjected to mode selection in the resonant cavity, so that effective filtering can be realized. The filter is small in size, so that the filter is more beneficial to integration, and meanwhile, the coupling packaging structure is compact, low in manufacturing material cost and suitable for large-scale production.

Description

technical field [0001] The invention relates to the technical field of laser filters, in particular to a novel cascaded microsphere cavity filter. Background technique [0002] With the development of communication technology, optical communication network needs to continuously improve working performance and reduce operating cost. The core technology lies in the miniaturization, integration, scale and high precision of optical waveguide devices. Future all-optical networks urgently need new optical waveguide devices that can achieve multiple functions and high efficiency. Among them, the series micro-ring resonator filter has different light transmission directions depending on whether the number of rings is odd or even. In parallel microring resonant filters, when the number of microrings N increases from small to large, the main resonant peak changes from convex to flat, the bandwidth narrows, the side lobes increase, and the sub-resonant peak rises, making the non-reson...

AI Technical Summary

Problems solved by technology

Among them, the series micro-ring resonator filter has different light transmission directions depending on whether the number of rings is odd or even.

In parallel microring resonant filters, when the number N of microrings increases from small to large, the main resonant peak changes from convex to flat, the bandwidth narrows, the side lobes increase, and the sub-resonant peak increases, making the non-resonant light stronger. Causes interference signal enhancement, making optical detection more difficult

Moreover, the processing of the disk cavity is a new process explored in recent years. Through chemical etching, the smoothness is not enough and the quality factor Q is low.

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