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We experimentally demonstrate tunable silicon comb filters based on Fabry–Perot (FP) resonators composed of two Sagnac loop mirrors. The comb filter resolves up to 54 comb lines with a 115 GHz channel spacing over a spectral range from 1510 to 1560 nm. The comb line extinction ratio is ∼26.3  dB and the quality factor is ∼57,000 around 1550 nm wavelength. Electrical tuning is enabled via periodically interleaved PN junctions embedded inside the FP resonator. The comb lines are blue shifted by ∼0.92  nm (one channel spacing) with a 5 mA forward-bias current and red-shifted by ∼0.05  nm with a −10  V reverse-bias voltage.