All-Fiber Vector Inclinometer Based on 45° Tilted Fiber Grating Inscribed in a Fiber Ring Laser System

An inclinometer based on tapered fiber grating (TFG) is proposed in fiber ring laser (FRL). The performance of the inclinometer is studied theoretically and analyzed experimentally. Fiber gratings with a length of 8 mm were fabricated and characterized in FRL. The sensitivity is 1.21 dBm/°. In addition, it has a narrow 3 dB bandwidth ($\lt 0.015$ nm) and a high optical signal-to-noise ratio (∼ 60 dB), which benefits from the laser sensing system. The experimental results show that the designed TFBG inclinometer has a simple structure, compact structure and wide application prospect.