Tunable optical frequency comb filter based on silicon-based fp resonator

Abstract

An adjustable light frequency comb filter based on a silicon-based FP resonant cavity in the technical field of optical fiber communication is achieved by an FP resonant cavity consisting of two cascaded SLRs. The length of the and the reflection rate of the SLRs are changed through a Mach-Zehnder interferometer provided with phase shifters on two arms, accordingly the central wave length and band width of the adjustable light frequency comb filter are respectively adjusted. The central wave length adjustment is achieved by simultaneously performing positive or negative phase shifting on two MZI arms to change the length of the FP resonant cavity, and accordingly the central wave length of the filter is adjusted. The band width adjustment is achieved by respectively performing positive or negative phase shifting on two MZI arms to change the reflection rate of the SLRs, and accordingly the band width of the filter is adjusted. The central wave length and the band width of the filter can be independently adjusted, and the adjustable light frequency comb filter based on the silicon-based FP resonant cavity has the advantages of being small in size, simple in structure and easy to integrate in a large-scale mode.

Description

technical field [0001] The invention relates to a device in the technical field of optical fiber communication, in particular to an optical frequency comb filter based on a silicon-based Fabry-Perot (FP) resonant cavity with simultaneously adjustable wavelength bandwidth. Background technique [0002] Silicon-based photonic devices have the advantages of strong mode field confinement characteristics and compatibility with CMOS processes, and are ideal for integrated optical circuits. Silicon-based photonic devices mainly include filters, modulators, optical switches, routers, and detectors. Optical frequency comb filters can route and block multi-wavelength signals, and are widely used in wavelength division multiplexing (WDM) systems. Compared with optical frequency comb filters based on fiber optics, on-chip optical frequency comb filters have the advantages of large-scale integration, low power consumption, and high stability. [0003] After searching the prior art, it ...

AI Technical Summary

Problems solved by technology

However, this technology cannot realize the adjustment of filter wavelength and bandwidth, and it is not suitable for on-chip integration due to the use of optical fibers and polarization controllers to form Sagnac rings.

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