Abstract
In this paper, multi-core fiber (MCF) is integrated in interferometric fiber optic gyroscope (IFOG) as the sensing coil to improve its sensitivity without increasing the fiber length or Shupe error. We have used a 300-m long 7-core fiber and connected 4 cores of MCF to each other by fan-in and fan-out (FIFO) devices of fused taper in closed-loop IFOG to replace the traditional single-core fiber (SCF). Before experiment, the main benefits and certain possible problems of using MCF are explained and analyzed. The angular random walk (ARW) of 0.006°/√h and drift of 0.01°/h have been achieved, which is close to the performance of IFOG using the 1200-m long SCF. Besides having a lower Shupe sensitivity, the MCF-IFOG also has small crosstalk effect when using broadband light source. The results show that the scheme of MCF for IFOG is expected to be used in practical application in the foreseeable future.
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