This paper presents the development of a high-performance three-component fiber optic rotation seismometer (FORS) named DC-Rot3C for rotational seismic observation. Its core sensing element is a novel dual-channel interferometric fiber optic gyroscope (IFOG), which differs from conventional minimum configuration. The IFOG in DC-Rot3C is composed of two sensing channels, which can effectively suppress self noise such as relative intensity noise. This paper provides a detailed demonstration and analysis of the optical configuration, demodulation technology, layout construction, and noise suppression mechanisms of the developed DC-Rot3C. Furthermore, the performance of DC-Rot3C is tested, and the experimental results show that, with an effective sensing area of only

$246\,\,\mathrm{m^{2}}$

, the self-noise remains flat from 0.001 Hz to 100 Hz, reaching a sensitivity of

$6.2\times 10^{-9}\;\mathrm{rad/s/\sqrt{Hz}}$

. Additionally, the angle random walk (ARW) reaches

$4.54\times 10^{-9}\;\mathrm{rad/\sqrt{s}}$

, and the bias instability (BI) reaches

$2.96\times 10^{-10}\;\mathrm{rad/s}$

. Compared with other IFOGs and FORSs, the DC-Rot3C exhibits superior performance with the same sensing area, providing a high-precision tool for seismic observation.

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