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A Method to Eliminate the Impact of Parasitic Capacitance for Intra-Body Communication using Mach-Zehnder Electro-Optical Modulation

Intra-body communication (IBC) is a communication technology that uses the human body as a signal transmission medium. It has wide application prospects in many fields. The existence of the parasitic capacitance caused by the receiver can affect the attenuation and stability of the IBC signal, which could make it difficult to be detected. To solve the problem, a method to eliminate the impact of parasitic capacitance for intra-body communication using Mach-Zehnder electro-optical modulation is investigated. The experiments of receiving the IBC signal by the electrical sensor and the Mach-Zehnder (M-Z) electro-optical modulation device developed were conducted, which show that the signal intensity could be stabilized around -15.4 dBm using the developed device, while the signal intensity detected by the electrical sensor ranged from -27 dBm to -31.4 dBm. The signal intensity was increased more than 11.6 dB by the developed device, which proves that this method can effectively improve the ability of the receiver to detect the IBC signal.