The optical waveguide acceleration sensor is a practical acceleration sensor

core components of widely used interferometer

such as Michelson

Mach-Zehnder interferometer

etc

to fabricate optical accelerometer

contain 3 dB coupler. The design of 3dB coupler is particularly important for detection precision of acceleration sensor. The working principle of optical waveguide acceleration sensor is described

and structure and parameters of 3 dB coupler are designed

and the software OptiBPM is used to simulate the 3D coupler. The results show that the designed 3 dB coupler has good performance

and meets the design requirements.