Optoacoustic tomography enables high-resolution visualization of optical contrast in biological tissue at depths in which light is completely diffused due to multiple scattering. Optoacoustic systems represent a hybrid technology in which the excitation is provided by high-energy lasers, but the detection is performed with ultrasound transducers. Conventionally, piezoelectric transducers are used, whose bulky apparatus limits clinical applications. This talk will be dedicated to a new approach for all-optical optoacoustic tomography in which ultrasound detection is performed optically using silicon photonics for the sensing elements and pulse interferometry for the signal readout.