A photonic device for detecting rotation and a corresponding method for operation thereof are disclosed. The photonic device includes a readout structure coupled to a ring resonator at one or more coupling points. Light is split between a lower waveguide and an upper waveguide of the readout structure in a forward direction at a beam splitter. The light in the waveguides traveling in the forward direction is coupled into the ring resonator and subsequently back into the waveguides in a reverse direction. The light is spatially phase tilted and is combined at the beam splitter. The combined light is detected by a split detector.

A system that includes a high performance sensor to provide accurate measurements and at least one dissimilar sensor that is less accurate. The at least one dissimilar sensor is of a different type of sensor than the high performance sensor while providing a same type of measurement as the high performance sensor. The at least one dissimilar sensor has a longer life expectancy than the high performance sensor. An at least one controller is configured to start both the high performance sensor and the at least one dissimilar sensor at startup of the system, to turn off the high performance sensor after a select period of time, and to output measurement data based on measurements of the high performance sensor while the high performance sensor is on and output the measurement data based on the at least one dissimilar sensor when the high performance sensor is off.

Systems and methods for resonance switching RFOGs with feed-forward processing are provided. In one embodiment, a system comprises: a fiber optic resonator; first and second laser sources coupled to the resonator, wherein the first source launches a first beam into the resonator and the second source launches a second beam into the resonator in an opposite direction; a first servo loop that locks the first beam to a first resonant mode of the resonator during a first state and to a second resonant mode of the resonator during a second state; a second servo loop that locks the second beam to the second resonant mode during the first state and to the first resonant mode during the second state; a feed-forward rate processor coupled to the servo loops that calculates a FSR average across a prior resonance switching cycle of resonant frequency measurements and applies the average to current measurements.

A digital to analog converter for fiber optic gyroscope is disclosed. The digital to analog converter for fiber optic gyroscope includes a random unit generating a random number signal, a plurality of encoding units coupled with the random unit, a plurality of control units respectively one to one coupled with the plurality of encoding units, a current source array coupled with the plurality of control units, and an output load electrically connected to the current source array. Each of the plurality of encoding units converts a plurality of digital signals to a plurality of spin signals according to the random number signal. Each of the plurality of control units converts the plurality of spin signals to a plurality of logic signals. The current source array generates a total current according to the plurality of logic signals. The total current passes through the output load and forms an analog signal.

A ring laser gyroscope includes an optical block for generating laser beams that counter-propagate in a closed-loop type optical path, a dither mechanism for applying dither vibration for mitigating a lock-in phenomenon to the optical block, and a dither controller for controlling the dither vibration. The dither controller imparts randomness to the frequency of the angular velocity of the dither vibration.

A photonic device for detecting rotation and a corresponding method for operation thereof are disclosed. The photonic device includes a readout structure coupled to a ring resonator at one or more coupling points. Light is split between a lower waveguide and an upper waveguide of the readout structure in a forward direction at a beam splitter. The light in the waveguides traveling in the forward direction is coupled into the ring resonator and subsequently back into the waveguides in a reverse direction. The light is spatially phase tilted and is combined at the beam splitter. The combined light is detected by a split detector.

A photonic device for detecting rotation and a corresponding method for operation thereof are disclosed. The photonic device includes a readout structure coupled to a ring resonator at one or more coupling points. Light is split between a lower waveguide and an upper waveguide of the readout structure in a forward direction at a beam splitter. The light in the waveguides traveling in the forward direction is coupled into the ring resonator and subsequently back into the waveguides in a reverse direction. The light is spatially phase tilted and is combined at the beam splitter. The combined light is detected by a split detector.

Systems and methods for embodiments having an extra thick ultraviolet durability coating are described herein. For example, a system may include a laser block assembly. The system may also include a cavity in the laser block assembly. Further, the system may include a plurality of multilayer mirrors in the cavity. In certain embodiments, at least one multilayer mirror of the plurality of multilayer mirrors may include a plurality of alternating layers of a first optical material having a high index of refraction and a second optical material having a first low index of refraction. Additionally, the at least one multilayer mirror may include a multilayer durability coating disposed on the plurality of alternating layers.

A device includes an optical resonator having four ports including a first port, a second port, a third port, and a fourth port. A first electronic circuit is configured to calculate a first information representative of a power difference between optical signals supplied by two of the four ports. A method of operating a device is also disclosed.

A system that includes a high performance sensor to provide accurate measurements and at least one dissimilar sensor that is less accurate. The at least one dissimilar sensor is of a different type of sensor than the high performance sensor while providing a same type of measurement as the high performance sensor. The at least one dissimilar sensor has a longer life expectancy than the high performance sensor. An at least one controller is configured to start both the high performance sensor and the at least one dissimilar sensor at startup of the system, to turn off the high performance sensor after a select period of time, and to output measurement data based on measurements of the high performance sensor while the high performance sensor is on and output the measurement data based on the at least one dissimilar sensor when the high performance sensor is off.