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A novel hybrid-integrated optical accelerometer, based on Mach--Zehnder interference, is described. The integrated Mach--Zehnder microinterferometer chip is investigated theoretically and experimentally. On the LiNbO3 substrate with the dimensions of 38 mmx6 mmx2 mm, MMI optical power splitter, Y-branching guide, phase modulator and polarizers are integrated to constitute the Mach--Zehnder microinterference chip. The performance of a prototype of the accelerometer is characterised. The measured frequency spectrum is in good agreement with the theoretical prediction. [ABSTRACT FROM AUTHOR]