A simple optical technique to compensate for excess RIN in a fiber-optic gyroscope

Multi-harmonic modulation in a fiber-optic gyroscope

“…This has been demonstrated in previous experiments that are based on using a 30 km-long single-mode (SM) fiber coil [13]. Several techniques were demonstrated to re-duce the effects of RIN: using noise subtraction by either electronic [14] or optical [15][16][17] means; with an interferometric filter [18]; with a fiber ring resonator [19]; using a semiconductor amplifier [20]; and by current feedback [21].…”

Multi-harmonic modulation in a fiber-optic gyroscope

“…This has been demonstrated in previous experiments that are based on using a 30 km-long single-mode (SM) fiber coil [13]. Several techniques were demonstrated to reduce the effects of RIN: using noise subtraction by either electronic [14] or optical [15]- [17] means; with an interferometric filter [18]; with a fiber ring resonator [19]; using a semiconductor amplifier [20]; and by current feedback [21].…”

Differential Fiber Optic Gyroscope Driven by Two Broadband Sources of Different Wavelengths

“…When the wavelengths of the two SLDs are selected, the value of h will be determined by the ratio of dispersion coefficient D 1 and D 2 , as defined by (7). For the DFOG used in our experiments, the PM fiber coil was fabricated by the symmetrical quadrupolar winding method and the UV glue was used to fill the gap between fibers during the winding process, cured and heat-treated specially in the end.…”

“…Several sources of noise, including coherent backscatters, shot and thermal noises in photoreceiver are largely overcome by using high power broadband sources, leaving the excess source relative intensity noise (RIN) as the dominant noise contributor [5]. Techniques such as electronic RIN subtraction [6], optical RIN subtraction [7], using an interferometric filter [8] and application of the Wiener filter [9] have been developed to reduce the RIN and good performance has been achieved. The bias drift is largely caused by time-varying temperature gradient along the fiber [10], [11], which can be reduced effectively by symmetric fiber-winding [12], proper mechanical packaging [13], adopting a heating insulation cavity [14], and other methods [15], [16].…”