Design and analysis of a miniature silica waveguide coupler

Waveguide coupler is an important element of optical integrated transceiver module,making up of the optical fiber sensor systems and optical communication systems.It is the basic realizing one-chip hybridly integrated optical transceiver module.An optical waveguide coupler,specially used for FOG and its principle are presented.Based on effective index method(EIM) and beam propagation method(BPM),the mathematic model of waveguide coupler is established.Under the conditions of possible miniaturization and single-mode optical beam transmitting of waveguide coupler,coupling ratio,effective coupling length,returning loss and their relationships are calculated and analyzed.Its key technology is systematically investigated.On the basis of analysis of emulating results,the size of optical waveguide coupler with division radio 50%:50% and low loss can achieve 33.5×0.41mm2,and the size of the core is 6×6μm2.