Flat-topped optical filter

Abstract

The invention discloses a flat-topped optical filter, which comprises a one-to-two device, an MZ element and a two-in-one device, wherein the one-to-two device comprises a spectrum input end, a firstoutput end and a second output end, and the spectrum energy of the first output end is greater than or equal to the spectrum energy of the second output end; the input end of the MZ element is in buttjoint with the second output end, and the MZ element is used for converting the spectrum output by the second output end into an M-type spectrum and outputting the M-type spectrum through the outputend of the MZ element; the two-in-one device comprises a first input end, a second input end and a spectrum output end, the output end of the MZ element is in butt joint with the first input end, andthe first output end is in butt joint with the second input end. And the spectral width can be increased, so that the spectral width requirement of the WDM device can be met. The invention is appliedto the field of optical elements.

Description

technical field [0001] The invention relates to the field of optical elements, in particular to a flat-top optical filter. Background technique [0002] WDM device, WDM, Wavelength Division Multiplexer, the Chinese name is a wavelength division multiplexer. WDM is a wavelength division multiplexing transmission technology for the access layer of the metropolitan area network. In principle, WDM uses an optical multiplexer to mix optical signals of different wavelengths and then injects them into a single optical fiber for transmission. The signal at the original wavelength is connected to the corresponding receiving equipment. Most of the existing WDM devices are diaphragm type and chip type. Among them, the parameters such as the insertion loss isolation of the diaphragm type wavelength division multiplexing scheme are very good, but the subsequent channel insertion loss is relatively large due to its cascaded structural design. The chip type is mostly designed by interfe...

AI Technical Summary

Problems solved by technology

Most of the existing WDM devices are diaphragm type and chip type. Among them, the parameters such as the insertion loss isolation of the diaphragm type wavelength division multiplexing scheme are very good, but due to its cascaded structure design, the subsequent channel insertion loss is relatively large.

Images