Wavelength calibration technology of overlapping spectra in MRR-WDM transmission systems

Abstract

This paper innovatively proposes a technique for controlling the full-width at half-maximum (FWHM) of the output spectrum using a weighted voltage applied to a microring resonator (MRR). Through physical mechanism analysis and mathematical modeling of the add-drop microring resonator, we demonstrate precise FWHM adjustment at the through port of an MRR-based wavelength division multiplexing (WDM) system, thereby providing robust technical support for the physical layer in dense WDM (DWDM) and ultra-dense WDM (UDWDM) communication and computing systems. Under the condition of a Δf_WDM of 200 GHz, the similarity index (SI) of the transmission spectrum difference before and after FWHM adjustment is as high as 95.2 %. When the Δf_WDM is 400 GHz, the SI can reach 98.3 %.