Development and evaluation of a navigation grade resonator fiber optic gyroscope

Directions of development of optical gyroscopes based on passive ring resonators

“…Configurations of optical resonator gyroscopes, in which the frequencies in the two channels of the gyroscope are tuned to the eigenfrequencies of the resonator by two tunable lasers, have also been developed [40][41][42]. In this case, phase modulators are used only to create the periodic modulation of radiation necessary to generate feedback signals.…”

“…Mostly, to minimize this error, an additional non-reciprocal frequency shift is created in the CW and CCW channels, for example, channels are tuned to different longitudinal resonator modes. Various types of phase modulation [4,5,20,22,34,32,44] or a number of lasers [40][41][42] can be used for this purpose. As a result, the CW and CCW waves have significantly different frequencies, which are spaced across the spectrum by several intermode intervals, and the beats that appear during interference with the backscattered wave can be excluded, for example, by a low-pass filter.…”

“…It is also possible to reduce the influence of the Kerr effect by rectangular modulation of the laser power with a duty ratio of 0.5 [72] or to measure the error caused by the Kerr effect and eliminate it algorithmically when processing the output signal [73]. There are passive methods of control: application of a ring resonator made of hollow photonic crystal fiber [40,45,74,75], usage of two different resonators for CW and CCW waves [45], increasing the effective cross-sectional area of the mode [76], etc. [77,78].…”

Fiber optic gyro development at Honeywell

“…The SiOB is quite attractive in that it is capable of hosting fibers, lenses, mirrors, beam splitters, detectors and circulators all on a single chip. A portion of a SiOB used for a resonator is shown in the photo 16 of Figure 15, which is shown schematically in Figure 16. In Figure 16, the fiber ends are placed in two ends of a vee-groove and ball lenses couple the light from one fiber to the other, completing the resonator loop.…”

Z-domain modeling methodology for homodyne digital optical phase-locked loop

“…Homodyne optical phase-locked loop is one kind of optical phase-locked loops (OPLLs) applied in optical field, such as coherent optical communications [1,2,3,4,5], resonant fiber optical gyroscope (RFOG) [6,7,8,9,10], and so on. Via feedback technology, phase locking between input optical signal and local optical signal can be achieved by homodyne OPLL.…”