Assembly-Free-Based Fiber-Optic Micro-Michelson Interferometer for High Temperature Sensing

We demonstrated a novel ultracompact fiber-optic micro-Michelson interferometer (MMI) for high temperature sensing. In the MMI structure, a 45 degrees angled reflector is polished at the tip of a single mode fiber using a fiber-lensing machine. This reflector divides the fiber core into two parts and splits the inputting light into two beams producing Michelson interference fringe. The experimental results indicate that the proposed sensor has average temperature sensitivity of 13.32 pm/degrees C as the temperature increases from 19 degrees C to 950 degrees C. With the all-glass assembly-free-based structure, the sensor has a capability of surviving in the high temperature harsh environment.