Dynamic range expanding method based on modulator offset point information acquisition
A dynamic range, bias point technology, applied in the direction of eliminating distortion/dispersion, fiber transmission, etc., can solve the problem of difficult parameter estimation in the digital domain, etc., to achieve the effect of offsetting nonlinear distortion
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[0037] Embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but should not be used to limit the scope of the present invention.
[0038] A dynamic range improvement method based on modulator bias point information acquisition provided by this implementation is as follows: figure 2 As shown, firstly, the numerical model of modulation nonlinear characteristics is clarified through modeling analysis, and the compensation function is constructed by extracting baseband and operating point information to complete the cancellation of distortion. The specific implementation process is as follows.
[0039] When the electrode center frequency of the first Mach-Zehnder modulator (MZM1) is input as ωm two-tone signal:
[0040] x(t)=ρ(t)cos(ω m t) (1)
[0041] where ρ(t)=2A m cos(Δt) is the equivalent envelope of the input dual-ton...
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