Bus waveguide light
Ring circulating field
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This simulator models a carrier-depletion silicon micro-ring modulator — the device that converts an electrical data signal into an optical one inside silicon photonic transceivers. A bus waveguide carries a continuous-wave laser past a ring resonator; when the laser wavelength sits on the ring's resonance, light couples in, circulates, and is dissipated, so almost none reaches the output. Applying a reverse bias to a PN junction embedded in the ring depletes free carriers from the waveguide core, raising its refractive index and red-shifting the resonance away from the laser line, which switches the output back on. The 3D scene renders the real all-pass ring transfer function (self-coupling, round-trip phase and loss), animates the circulating field building up in the ring at resonance, and plots both the static transmission spectrum and a live time-domain trace so you can watch the on–off-keyed output respond to the drive voltage.