A novel scheme for a double closed-loop resonant fiber-optic gyroscope (R-FOG) employing a high-performance transmissive Kagome hollow-core photonic crystal fiber (HCPCF) resonator is proposed. We use specially designed Kagome HCPCFs and a meniscus lens module to form a resonator, whose finesse is 58.2 with a length of 5.6 m and a diameter of 13 cm; the theoretical sensitivity of the R-FOG is better than 0.05°/h. Based on the novel Kagome HCPCF resonator, a double closed-loop R-FOG is set up and the performance of the R-FOG system is experimentally studied. It demonstrates that white noise dominates in the output at the integration time of 200 s and a bias stability of 0.15°/h and angle random walk coefficient of 0.04 ∘ h 1 / 2 are achieved. Over a dynamic range of − 100 ∘ / s to 100°/s, the scale factor nonlinearity of the FOG is 310 ppm, which shows significant improvement compared with the single closed-loop R-FOG system. The novel double closed-loop R-FOG proposed is quite feasible for tactical grade applications.

A novel scheme of an ultralow relative intensity noise (RIN) broadband source module employing a double pumped backward (DPB) Er-doped superfluorescence fiber source (EDSFS) and a semiconductor optical amplifier for interferometric fiber optic gyroscopes (IFOGs) is proposed. With optimized parameters, the optimal twin-peak output profile of the source is obtained. The effective optical spectrum width of the source is 38.6 nm, and the output power is about 12.5 mW. Compared with the DPB EDSFS with a similar spectrum, the ultralow RIN broadband source proposed demonstrates a lower RIN of about 8.4 dB. A high-precision IFOG utilizing the ultralow RIN broadband source is set up, and the performance of the IFOG is experimentally studied. An angle random walk coefficient of 6.93 × 10 − 5 o / h 1 / 2 is demonstrated, which is reduced by about 31.5% compared with the same IFOG system utilizing conventional DPB EDSFS with a similar spectrum profile. The ultralow RIN broadband source module proposed is quite feasible for high-precision IFOGs used in strategic-grade navigation systems and satellites.

Radiation-induced attenuation self-compensating effect in super-fluorescent fiber source * Yang Yuan-Hong(杨远洪) a)b) † , Suo Xin-Xin(索鑫鑫) a) , and Yang Wei(杨 巍) b) a) Key Laboratory on Precision Opto-

The effect of gamma ray radiation on the performance of a compact Er-doped super-fluorescent fiber source was investigated experimentally. It was found that the output power and spectrum of the source vary significantly with radiation dosage and probably the induced background loss for the pump would play a significant role in the observed variations. A double-pass backward source configuration with an output edge filter was implemented experimentally, and with proper feedback control pump driving circuitry, such a configuration demonstrated good resistance to gamma ray radiation.

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