Abstract: A hollow-core optical-fiber filter is provided. The hollow-core optical-fiber filter includes a hollow-core optical fiber having a first end-face and an opposing second end-face. The first end-face and the second end-face set a fiber length. The hollow-core optical-fiber filter also includes a first reflective end-cap positioned at the first end-face and a second reflective end-cap positioned at the second end-face. When an optical beam from a laser is coupled into one of the first end-face or the second end-face, an optical output from the opposing end-face has a narrow linewidth and low frequency noise fluctuations.

Abstract: A hollow-core optical-fiber filter is provided. The hollow-core optical-fiber filter includes a hollow-core optical fiber having a first end-face and an opposing second end-face. The first end-face and the second end-face set a fiber length. The hollow-core optical-fiber filter also includes a first reflective end-cap positioned at the first end-face and a second reflective end-cap positioned at the second end-face. When an optical beam from a laser is coupled into one of the first end-face or the second end-face, an optical output from the opposing end-face has a narrow linewidth and low frequency noise fluctuations.

Abstract: A method of constructing a fiber-optic gyroscope includes optically coupling first and second optical fibers to an optical path of an interferometer having an outer surface, coupling at least a portion of the first and second fibers to the outer surface, and optically coupling the first and second fibers to an optical path of an integrated optics chip (IOC).

Abstract: A method of constructing a fiber-optic gyroscope includes optically coupling first and second optical fibers to an optical path of an interferometer having an outer surface, coupling at least a portion of the first and second fibers to the outer surface, and optically coupling the first and second fibers to an optical path of an integrated optics chip (IOC).

Abstract: A structural packaging assembly to support a multi-function optic chip or the like is mountable in a gyroscopic unit. An example assembly includes a housing mounted to a mounting plate. The chip is located in the housing, which in turn is coupled to a mounting plate. The housing may have a prescribed section modulus capable of sufficiently withstanding applied vibrations within a predefined vibrational range, such as a vibrational range at or below about 3500 Hz. The structural packaging assembly utilizes a mounting system with mounting feet that clamp to dowels, which in turn have been press fit into the mounting plate. In one embodiment, the mounting feet take the form of “C” clamp mechanisms, which after being clamped to the dowels, allow for resonance dampening between the housing and the mounting plate.

Abstract: A sensing coil is provided for optically guiding counter-propagating light beams in a fiber optic gyroscope. The sensing coil comprises a plurality of layers of an optical fiber having a winding direction. The plurality of layers comprises inner layers, middle layers, and outer layers. The middle layers comprise first and second input ends configured to receive the counter-propagating light beams. At least one of the inner layers, middle layers, and outer layers is coupled with a different one of the inner layers, middle layers, and outer layers while maintaining the winding direction. A method is provided for winding an optical fiber, having first and second connecting ends, to form a sensing coil for a fiber optic gyroscope having a winding direction.

Abstract: Adhesive system and method are provided for affixing a fiber optic coil to a hub with an adhesive in a fiber optic gyroscope. The adhesive system comprises a fiber optic coil, a substantially cylindrical hub configured to couple with the fiber optic coil, and an array of adhesive dots affixing the fiber optic coil to the substantially cylindrical hub. The method comprises forming an array of adhesive dots on an outer surface of the hub, and affixing the fiber optic coil to the outer surface of the hub via the array of adhesive dots.

Abstract: A fiber optic coil has a plurality of layers of turns. The turns of a first layer of the plurality of layers of turns are adjacent and are wound from an optical fiber having a first diameter. The turns of other layers of the plurality of layers turns are found from an optical fiber having a second diameter. The second diameter is less than the first diameter. The first layer may or may not be part of a sensing path provided by the plurality of layers of turns.

Abstract: A rectification error reducer for a fiber optic gyroscope, which is an intensity servo or compensator for reducing vibration effects in the optical signals caused by modulation at vibration frequencies induced by the gyroscope-operating environment. The vibration effects may be detected in signals from the photodiode output in amplitude form, which is used in a control system to null out optical intensity variations at the frequencies of vibration.

Abstract: A design for an environmentally robust fiber depolarizer for a fiber optic gyroscope is disclosed. The design comprises; substantially a clockwise propagating leg and a counterclockwise propagating leg, distally coupled at opposite ends of a gyroscope sensing coil, said depolarizer fiber leg wound in a that is rotation insensitive pattern and that is also a symmetrical winding pattern. Moreover, axial, radial and embedded sensing coil mounting methods for the fiber depolarizer to reduce the depolarizer sensitivity to thermal variations are also disclosed. Specific attention to the design of the fiber depolarizer of a gyroscope provides enhanced immunity to the stress of environmental variation.

Abstract: A fiber optic gyroscope that includes an improved winding transition section otherwise known as a "jog zone". The improved jog zone reduces losses due to micro-bends and cross-coupling in the fiber optic coil. The reduced losses enable a more accurate measurement of rotation rate of the fiber optic coil, while minimizing unwanted phase-shifts that can cause false readings in the fiber optic gyroscope.

Abstract: A rectification error reducer for a fiber optic gyroscope, which is an intensity servo or compensator for reducing vibration effects in the optical signals caused by modulation at vibration frequencies induced by the gyroscope operating environment. The vibration effects may be detected in signals from the photodiode output in amplitude form which is used in a control system to null out optical intensity variations at the frequencies of vibration.

Abstract: A rectification error reducer for a fiber optic gyroscope, which is an intensity servo or compensator for reducing vibration effects in the optical signals caused by modulation at vibration frequencies induced by the gyroscope operating environment. The vibration effects may be detected in signals from the photodiode output in amplitude form which is used in a control system to null out optical intensity variations at the frequencies of vibration.

Abstract: A pneumatically actuated, electrically controlled electronic component handling apparatus straightens out the leads of an electronic component, positions and orients the component for engagement by an automatic gripper device, and determines the exact orientation of the component for subsequent testing, assembly or insertion of the component in circuit. As a component exits a vibrating delivery chute, a first pneumatic cylinder places a component stop in position to prevent the exit of additional components from the chute. With the discharged component engaged from above by a second pneumatic cylinder actuated pusher, a third pneumatic cylinder raises a component carriage in engagement with a lower portion of the component. The carriage includes a pair of elongated slots therein having enlarged openings for receiving and straightening a respective component lead inserted therein.