A hybrid modulation method and system

Abstract

The invention relates to a hybrid modulation method and system. The method establishes a simulation model of a spatial light modulator; through the simulation model, the phase modulation depth of each communication port of the blazed grating is obtained: within the phase modulation range, through simulation The model obtains the diffraction efficiency of each order when the light output from port 0 is diffracted into the target communication port k, and the diffraction efficiency of each order under different phase modulations, and selects the A k The π phase modulation depth is the phase modulation depth of the kth communication port, k ∈ (0, K); A k π phase depth modulation. The invention performs alternate modulation of different phase depths through the ports in the middle part, reduces the crosstalk between the communication ports, improves the diffraction efficiency, improves the isolation of the communication ports, and thus improves the transmission rate of the optical communication network.

Description

technical field [0001] The present invention relates to the technical field of spatial light modulation, in particular to a hybrid modulation method and system. Background technique [0002] In recent years, with the continuous development of optical communication, the requirements for communication devices in the communication system are also gradually increased, especially the wavelength selective switch of the core module in the optical communication system. The core device of the wavelength selective switch is the spatial light modulator. The most commonly used modulators are MEMS (Micro-Electro-Mechanical System, micro-electromechanical system) devices, but their flexibility is not enough, and it is gradually unable to meet the existing communication technology. requirements. With the gradual development of silicon-based liquid crystal devices, it has many advantages such as high diffraction efficiency, high resolution, high refresh rate, high flexibility, high integra...

AI Technical Summary

Problems solved by technology

However, when the current liquid crystal on silicon device is applied to the wavelength selective switch, there are still some problems, such as the diffraction efficiency is not high enough, and the isolation between the optical fiber ports is not enough. These problems make the liquid crystal on silicon device unable to obtain large-scale commercial production.

Images