110 results about "Fiber coil" patented technology

The invention provides a warp-knitted interval sensing fabric and a preparation method and application thereof, a pressure sensor, a pressure sensing foot pad and a plantar pressure value acquisition system, and belongs to the technical field of flexible sensors. The warp-knitted interval sensing fabric comprises an electrode layer, a monofilament interval layer and a sensing layer which are sequentially laminated; the warp-knitted interval sensing fabric is of an integrally formed structure; the electrode layer is provided with a full-penetrating double-comb structure and comprises a plurality of conductive strips which are arranged in parallel, and an insulating strip is arranged between every two adjacent conductive strips; the monofilament spacing layer is formed by mutually connecting fiber coils, and the electrode layer and the sensing layer are connected through the fiber coils; the sensing layer has a full-penetration double-comb weave and is obtained by weaving sensing yarns. According to the warp-knitted spacer sensing fabric pressure sensor, the electrode layer, the monofilament spacer layer and the sensing layer are integrally formed, the process is simple, the cost is low, and large-scale production and practical application are facilitated.

The invention discloses a deep-sea photoelectric separator with a liquid leakage identification function and an assembly process thereof, and the separator comprises a photoelectric separator cylinder, a sealing injection molding part, a submarine cable penetration part, a first end cover, a second end cover, a sensor, an optical connector, an electric connector, an electric connection box, and a fiber coiling box. The sensor, the electric connection box and the fiber coiling box are respectively arranged in the photoelectric separator cylinder, an insulating layer at one end of the submarine cable extends into the photoelectric separator cylinder through the submarine cable cabin-penetrating piece, and the sealing injection molding piece wraps the outer wall of the submarine cable cabin-penetrating piece and the insulating layer of a section of submarine cable in front of the outer end of the submarine cable cabin-penetrating piece, so that the sealing effect is improved; the submarine cable is divided into an electric wire part and an optical fiber part at one end in the photoelectric separator barrel, the electric wire part is connected with a tail cable of the electric connector in the electric connection box, the optical fiber part is connected with a tail cable of the optical connector in the fiber coiling box, the sensor is connected to one optical fiber in series, optical power detection is carried out through the sensor, and liquid leakage identification and alarm are achieved.

The invention discloses an optical engine with a multi-channel optical transceiver assembly and an optical module. The optical engine comprises a printed circuit board; the multi-channel light emitting assembly is arranged on the printed circuit board, and the multi-channel light emitting assembly comprises a wave combining Z-Block; the transmitting optical fiber is connected with the multi-channel light transmitting assembly; the multi-channel optical receiving assembly is arranged on the printed circuit board, and the multi-channel optical receiving assembly comprises a partial wave Z-Block and is used for carrying out partial wave processing on an input multiplexing optical signal to obtain optical signals of a plurality of optical channels; the receiving optical fiber is connected with the multi-channel optical receiving assembly and is used for inputting the multiplexing optical signal; and the fiber coiling frame is used for coiling the transmitting optical fiber and / or the receiving optical fiber. According to the optical module, low transmission loss, reliable optical fiber path management, optimized space utilization rate and simplified assembly process are realized, and the overall performance and reliability of the optical module are improved.

An optical module, comprising a circuit board (110), a photoelectric assembly (130) electrically connected to the circuit board (110), an optical interface (120), and optical fiber (140) in optical communication with the photoelectric assembly (130) and the optical interface (120), and a fiber coiling member (150). The fiber coiling member (150) comprises a fiber coiling body (151) enclosing an accommodating cavity (1510), and the fiber coiling body (151) is provided with a bottom wall (1512) and a fiber coiling wall (1511) extending from the bottom wall (1512) in the thickness direction of the circuit board (110). The fiber coiling wall (1511) defines a peripheral boundary of the accommodating cavity (1510). The fiber coiling member (150) further comprises stop walls (152) arranged opposite to the bottom wall (1512) in the thickness direction of the circuit board (110), and protruding from the fiber coiling wall (1511) to the interior of the accommodating cavity (1510). The accommodating cavity (1510) is provided with a stop space formed between the stop walls (152) and the bottom wall (1512), and the optical fiber (140) coils and extends along the fiber coiling wall (1511) and is limited in the stop space by the strop walls (152). The fiber coiling efficiency of the fiber coiling member (150) is high, and the bending radius of the optical fiber remains unchanged at will.

The utility model relates to a double-layer subdivision type optical cable fiber distribution box, and the box comprises a lower cabin body which comprises a lower housing with an opening at the top, a fiber coiling assembly fixedly disposed in the lower housing, and a welding overturning assembly which is disposed in the lower housing and is disposed above the fiber coiling assembly; the upper cabin body comprises an upper shell which is rotationally connected with the lower shell, the top of the upper shell is open, an adapter assembly is arranged in the upper shell, and when the lower shell is closed by the upper shell, a lower cabin is formed; the upper cover is of a hollow shell structure with the bottom open and the periphery closed, the upper cover is rotationally connected with the upper shell, and when the upper cover seals the upper shell, an upper cabin is formed. The fiber coiling assembly and the welding turnover assembly in the lower cabin are used for fiber coiling, fiber welding and light splitting operation of a main optical cable, the adapter assembly of the upper cabin is used for plugging operation of a user optical cable, construction and management of the upper cabin and the lower cabin are facilitated, the operation space is large, mutual interference of the upper cabin and the lower cabin is avoided, and the construction efficiency is improved.

The invention relates to the technical field of optical communication, in particular to a small-size packaged coherent communication optical module with an EDFA (erbium-doped fiber amplifier) and a fiber coiling method, and the optical module comprises an upper cover plate, a circuit board, an optical port assembly and a lower cover plate, the optical module further comprises a front-side fiber bundling plate and a back-side fiber bundling plate, the front-side fiber bundling plate is fixedly arranged on the front side of the circuit board, and the back-side fiber bundling plate is fixedly arranged on the back side of the circuit board. The circuit board is provided with an EDFA module. By arranging the front fiber bundling plate and the back fiber bundling plate on the two sides of the circuit board, optical fibers on the front side and the back side of the circuit board can be coiled into the front fiber bundling plate and the back fiber bundling plate respectively, the length of the coiled optical fibers is increased, and long-distance communication of the optical module is achieved.

The invention discloses a deep sea communication detection cable joint box and an integration method thereof, the deep sea communication detection cable joint box comprises a bending limiter, an outer layer cone, an inner layer cone, end covers, a photoelectric separation assembly, a heavy frame, a fiber coiling box and a shell, the end covers are arranged at two ends of an inner cavity of the shell, the inner layer cone is arranged on the outer side of the end covers, the outer layer cone sleeves the outer side of the inner layer cone, and the photoelectric separation assembly is arranged on the outer side of the outer layer cone. First connecting screws connected with the end covers are arranged on the outer-layer cone, the bending limiting devices are arranged at the two ends of the shell, the heavy frame is arranged in the shell and connected between the end covers on the two sides, and the fiber coiling box is arranged in the heavy frame to conduct optical fiber connection of the two sections of the probing cables. The photoelectric separation assemblies are arranged in the heavy frame and located at the ends of the corresponding probing cables, the heavy frame or the fiber coiling box is internally provided with an electric unit connection part for connecting the photoelectric separation assemblies on the two sides, connection is reliable, integration is rapid, stability is high, sealing performance is good, and tensile strength is high.

The present invention discloses a deep-sea sounding cable junction box and an integration method thereof, comprising: a bend limiter, an outer cone, an inner cone, an end cover, an optoelectronic separation component, a bearing frame, a fiber coiling box and a shell, the end covers are arranged at both ends of the inner cavity of the shell, the inner cone is arranged on the outside of the end cover, the outer cone is sleeved on the outside of the inner cone, and clamps the armored steel wire on the sounding cable, the outer cone is provided with a first connecting screw connected to the end cover, the bend limiter is arranged at both ends of the shell, the bearing frame is arranged in the shell and connected between the end covers on both sides, the fiber coiling box is arranged in the bearing frame to connect the optical fibers of two sections of sounding cables, the optoelectronic separation component is arranged in the bearing frame and is located at the end of the corresponding sounding cable, the bearing frame or the fiber coiling box is provided with an electrical unit connecting part connecting the optoelectronic separation components on both sides, the connection is reliable, the integration is fast, the stability is high, the sealing is good, and the tensile strength is high.

The invention provides an integrated temperature control fiber-optic gyroscope chip, method and system. The fiber-optic gyroscope chip integrated with temperature control comprises a signal transceiving unit, a gyroscope modulation unit, an optical signal processing unit, an optical fiber coil interface unit and an on-chip temperature-sensitive micro-ring resonant cavity, and the signal transceiving unit is used for forming an optical signal according to a light source; the on-chip temperature-sensitive micro-ring resonant cavity is used for forming a first transmission spectrum according to the optical signal; the gyro modulation unit is used for generating a modulation electric field in response to the modulation driving signal so as to perform phase modulation on the optical signal; the optical signal processing unit is used for performing polarization and beam splitting on the modulated optical signal to form a first path of optical signal and a second path of optical signal; and the optical fiber coil interface unit is used for transmitting the first path of optical signal and the second path of optical signal to a polarization maintaining optical fiber coil to form a gyroscope interference optical signal and outputting the gyroscope interference optical signal, so that a gyroscope detector obtains a compensated gyroscope output result according to the gyroscope interference optical signal.

The invention discloses a fiber arrangement structure of a three-axis integrated fiber-optic gyroscope, and relates to the technical field of three-axis integrated fiber-optic gyroscope design, the fiber arrangement structure comprises a fiber-optic gyroscope table, a fiber-optic ring, a shock absorber and a groove are arranged on the fiber-optic gyroscope table, the groove is composed of an annular fiber coiling area, a through hole and a surface wiring groove and is used for standardizing a fiber path, a traditional fiber coiling cavity is cancelled, and the fiber coiling area is increased; the peripheral space of the optical fiber ring is used for fiber coiling and layout, the overall framework is optimized, the problems of non-standard optical fiber routing and mass center control are solved, the optical fiber ring is suitable for miniaturized products, and the overall size is reduced.

The present application belongs to the technical field of material transportation equipment, and particularly relates to a fiber coil transportation device based on chain link plate variable distance, which comprises densely arranged feeding transportation power modules, equidistantly arranged production transportation power modules, a hanging assembly, a three-claw wire clamping disc, a sensor, a hanging rail, a main frame, a double-bar gate, a power connection module and an L-shaped push plate and the like. The L-shaped push plate on the chain pushes different positions of the hanging assembly to realize automatic conversion of the fiber coil from dense arrangement to equidistant arrangement. The double-bar gate drives the stop block to alternately act through a cylinder to realize one-by-one separation and transportation of the assembly. The power connection module uses an elastic polyurethane push rod to ensure transportation continuity. The three-claw wire clamping disc provides stable and reliable clamping function. The present application realizes efficient transportation of the fiber coil and significantly improves the automation level and transportation efficiency of the fiber connector production line.

The utility model relates to a fiber coiling frame, a cabinet and communication equipment, and belongs to the technical field of auxiliary devices of communication equipment, the fiber coiling frame comprises a fiber coiling assembly, a fiber coiling assembly and a fiber coiling assembly, the fiber coiling assembly comprises a fiber coiling box used for accommodating optical fibers; the folding assembly comprises a swing arm connected with the fiber coiling box, the swing arm is used for being connected with a cabinet, and the fiber coiling box can swing along with the swing arm so as to move out of or move into the cabinet. After the fiber coiling frame is installed, the fiber coiling box can be moved out of the cabinet for fiber coiling operation through cooperation of the fiber coiling box and the swing arm, and the fiber coiling box is moved back to a fixed position in the cabinet after fiber coiling is completed, so that the fiber coiling space is large, fiber coiling is convenient, and the problems that the fiber coiling space is limited and fiber coiling cannot be performed smoothly are solved. Compared with the existing fiber coiling structure, the fiber coiling operation position and the use placement position are separated, the operation scene is wide, the fiber coiling operation is convenient and is not limited by a narrow space, the user operation is greatly simplified, the operation efficiency is improved, and the product has high market competitiveness.

The embodiment of the invention provides a cable reel, a cable package and a package structure, and relates to the technical field of optical fiber communication. The cable reel comprises a cable reel shaft used for coiling a cable; and the limiting part is arranged at the end part of the cable shaft, and the size of the limiting part can be adjusted according to the amount of the coiled cable. Through one embodiment of the invention, the problem that the use scenes of various panels are difficult to adapt due to the fact that the spaces of'wire hiding ', 'fiber storage', 'cable storage 'and'fiber coiling' in the panels are difficult to reasonably utilize in the prior art is at least solved, and the effect of reserving cables with different lengths in the panels based on the change of the use scenes of the panels is further realized.

The utility model relates to a flow guide device with a fiber coiling function and a cabinet. A separation structure is provided with a cabinet rear door binding surface, a cabinet front door binding surface, an air inlet side surface and an air outlet side surface; the two air guide channels are located in the separation structure and distributed in the direction from the air inlet side face to the air outlet side face at intervals. Wherein two ends of one channel respectively penetrate through the cabinet front door binding surface and the air inlet side surface, and two ends of the other connecting channel respectively penetrate through the cabinet front door binding surface and the air outlet side surface; after the equipment cabinet is installed in the equipment cabinet, due to the existence of the equipment cabinet rear door binding surface and the equipment cabinet front door binding surface of the separation structure, isolation is carried out in the direction from cold air to hot air, and isolation is also carried out between transversely-inserted equipment in the direction of the equipment cabinet; cold air enters the left side of the transverse insertion equipment and the left side of the flow guide device from the cabinet front door; hot air is discharged from the right side of the transverse insertion equipment, one part is upwards discharged from the right air duct of the cabinet, and the other part is discharged from the front door of the cabinet through the right front of the guide device, thereby realizing isolation of cold air and hot air.

The invention discloses a fiber-optic gyroscope temperature modeling and compensating method based on double temperature sensors, which comprises the following steps: acquiring temperature data by using temperature sensors fixed on the inner side and the outer side of a fiber coil base, and calculating the time gradient and the space gradient of the temperature of a fiber coil as input information of a fiber-optic gyroscope temperature model. Then, setting acquisition parameters in the high-low temperature box, and recording the output, temperature and temperature change rate curve of the fiber-optic gyroscope; and according to data characteristics, segmenting the data, and performing multiple linear regression fitting by using each segment of data to establish a fiber-optic gyroscope temperature model. Secondly, calculating calibration factors of the gyroscope at various temperatures, and performing polynomial fitting to reduce nonlinearity; and finally, pre-processing the acquired temperature data, and substituting the pre-processed temperature data into the temperature model to calculate a real-time zero offset temperature compensation amount so as to complete online temperature compensation. And the performance stability and the measurement precision of the fiber-optic gyroscope in different temperature environments are effectively improved.

The invention discloses quasi-distributed sensing using an enhanced sensing structure. A system for distributed acoustic sensing may include a distributed acoustic sensing (DAS) station that transmits a DAS signal into a DAS fiber; and an enhanced sensing array, wherein the enhanced sensing array comprises at least one sensing part. The at least one sensing component may include a DAS fiber coil forming part of a DAS fiber; and a low elastic modulus housing surrounding the DAS fiber coil.

A distributed fiber optic sensing (DFOS) / distributed acoustic sensing (DAS) system and method employing a fiber optic sensor cable that collects vibrational data of individual utility poles suspending the fiber optic sensor cable and stores the vibrational data in a central office (CO). Machine learning (ML) models are developed, trained, and utilized to analyze vibrational features of the utility poles and determine their integrity. Additionally, DFOS / DAS systems and methods according to the present disclosure determine the location(s) of fiber coils that exist along a length of a fiber optic sensor cable.

The utility model relates to a visible light-based optical fiber slit width detection device, which belongs to the field of detection equipment, and comprises a semiconductor laser, the semiconductor laser emits visible light to enter a convex lens, and light beams are converged through the convex lens; the converged light beams enter a half-wave plate and a polarizing beam splitter to realize separation of P light and S light and light intensity adjustment; the adjusted light beam enters a first total reflective mirror and a second total reflective mirror and enters an optical attenuator through the first total reflective mirror and the second total reflective mirror, the light beam with attenuated light intensity enters a first optical fiber collimator, and the first optical fiber collimator is connected to an optical fiber coil to realize coupling of spatial light to optical fibers; the optical fiber coil is sequentially connected with a second optical fiber collimator, a digital camera and a computer; the whole device adopts common and cheap optical elements, so that the detection cost is reduced.

System for manufacturing a fiber optic coil of a gyroscope including a mandrel with relative actuation for forward and reverse rotation, a robotic arm equipped with a first nib, in the terminal part, in which the first nib has an elongated and partially flexible shape to guide the positioning of the optical fiber during its winding on the mandrel, one more optical mechanisms arranged to continuously acquire images of the coil during the winding process, a processor operationally connected with the robotic arm, with the one or more optical mechanisms and with the actuator of the rotation of the mandrel, in which the processor is configured to control the robotic arm and to define a mechanism for controlling the actuator of the mandrel rotation as a function of the continuously acquired images, so as to control the manufacturing of the optical fiber coil.

A system for distributed acoustic sensing comprising. The system may include a distributed acoustic sensing (DAS) station to launch a DAS signal into a DAS fiber; and an enhanced sensing array, the enhanced sensing array comprising at least one sensing component. The at least one sensing component may include a DAS fiber coil, forming a portion of the DAS fiber, and a low elastic modulus outer shell, surrounding the DAS fiber coil.

The invention discloses a submarine cable temperature stress state simulation experiment device and method. The device integrates an optical fiber coil assembly, a temperature displacement simulation box, a stretching mechanism, a wave making circulation cavity and a distributed optical fiber sensing system. The same submarine cable sample is subjected to adjustable temperature in a temperature control bath, axial strain is applied and measured by a stretching mechanism, a wave making circulation cavity reproduces periodic / aperiodic ocean current impact through a wave making plate, a driving paddle and a wave suppression grid, temperature, strain and flow field multivariable synchronous or independent loading is achieved, a distributed optical fiber sensing system obtains Brillouin frequency shift of the same section, and the Brillouin frequency shift is subjected to temperature control. And calibrating temperature and strain coefficients. The problem of signal aliasing errors caused by the fact that an existing experimental device can only test in a single-variable and segmented mode is solved, and the reliability and precision of submarine cable temperature stress monitoring by the BOTDR are improved.

A fiber optic gyroscope includes an optical fiber coil, at least one optical circuit, and at least one optical gate. The at least one optical circuit is configured to receive input optical signals generated by at least one optical source, to split each input optical signal into first and second optical signals, to phase modulate one or both of the first and second optical signals, to transmit the first and second optical signals to the optical fiber coil such that the first and second optical signals counterpropagate through the optical fiber coil, to receive the first and second optical signals after counterpropagating through the optical fiber coil, to combine the first and second optical signals after counterpropagating through the optical fiber coil, and to transmit the combined first and second optical signals to at least one photodetector. The at least one optical gate is configured to controllably time modulate the input optical signals and / or the first and second optical signals prior to being combined, said time modulating synchronized with said phase modulating.

The invention relates to a coil body (100) which is suitable for winding an optical fiber (200) thereon, having a cylindrical coil core (110) on which the optical fiber (200) is wound, said coil core (110) having a thread (120), in the depressions (121) of which the optical fiber (200) can be laid.

Disclosed herein are optical amplifier devices, optical amplifier assembly, and optical amplifier systems. Example embodiments may include: a plurality of input optical ports, each being configured to receive one of a plurality of input optical signals; a plurality of output optical ports, each being configured to output one of a plurality of output optical signals; a plurality of tap photodiodes, each respectively being connected to one of the plurality of input optical ports and the plurality of output optical ports; a wavelength division multiplexer configured to receive the input optical signal from each of the plurality of input optical ports and an optical input from a laser pump device and output a plurality of pumped optical signals; a plurality of erbium-doped fiber coils, each having a first end configured to receive one of the plurality of pumped optical signals and a second end configured to output an amplified optical signal; and an optical isolator configured to receive, for each of the plurality of erbium-doped fiber coils, the amplified optical signal and output the plurality of output optical signals, wherein the plurality of output optical ports are configured to receive one of the plurality of output optical signals.

The utility model discloses a vibration sensor for monitoring rock mass fracture, which relates to the field of monitoring equipment, is convenient to couple with rock mass and has a good monitoring effect on fracture signals. The vibration sensor comprises a deformable body, an optical fiber, a vibration conduction assembly and a rock mass coupling part. Through the rock mass coupling component mainly composed of the coupling base and the coupling connecting piece, the vibration sensor is convenient to install and arrange; the deformable body deforms when sensing a fracture signal, so that the first optical fiber coil and the second optical fiber coil deform; the first optical fiber coil spirally wound on the deformable body can monitor longitudinal and transverse strain perpendicular to the axial direction of the deformable body caused by vibration, and the second optical fiber coil with two or more linear segments arranged in the axial direction of the deformable body can monitor strain in the axial direction of the deformable body caused by vibration. Therefore, the vibration sensor has a good monitoring effect on the fracture signal.

The application discloses a kind of temperature modeling and compensation method of fiber-optic gyroscope based on double temperature sensor, including temperature data acquisition using temperature sensor fixed in the inside and outside of fiber coil base, calculate the time gradient and spatial gradient of fiber coil temperature, as the input information of fiber-optic gyroscope temperature model.Then, set acquisition parameters in high-low temperature box, record fiber-optic gyroscope output, temperature and temperature rate of change curve.According to data characteristics, segment data, and use each section of data to carry out multiple linear regression fitting, establish fiber-optic gyroscope temperature model.Then, calculate the gyroscope calibration factor at each temperature, and carry out polynomial fitting to reduce nonlinearity.Finally, pre-process the collected temperature data, substitute into temperature model to calculate real-time zero bias temperature compensation amount, complete online temperature compensation.Effectively improve the performance stability and measurement accuracy of fiber-optic gyroscope in different temperature environments.

The application belongs to the technical field of long-term drift suppression of fiber-optic gyroscope zero bias and scale factor, and particularly relates to a long-term drift suppression method for equivalent sensitive area of a fiber coil. A homogenization, de-homogenization analysis idea and a finite element analysis approach are adopted to establish, verify and calibrate thermodynamic parameters of each non-metallic material of the fiber coil. A mathematical model of long-time drift of circumferential strain, radial strain and three-dimensional stress of a micro-element section of the fiber coil with time, temperature and other environmental conditions is calculated to obtain long-time drift of effective refractive index of each micro-element section. Finally, average long-time drift and dispersion characteristics of the effective refractive index of the fast axis of the fiber coil are obtained, so that long-time drift characteristics of the scale factor of the fiber-optic gyroscope are analyzed. In turn, according to the model, thermodynamic parameters and geometric proportions of each non-metallic material of the fiber coil are optimized to finally realize long-term drift suppression of the equivalent sensitive area of the fiber coil.

The application provides a kind of optical fiber gyro transit time measurement method, generates square wave bias modulation signal and triangular wave modulation signal, superimposes and generates special modulation signal;Special modulation signal is applied to Y waveguide phase modulator by D / A converter and amplification circuit, and the phase modulation of two beams of light in optical path is carried out, and the phase-modulated light propagates in optical fiber ring for a week and then interferes in Y waveguide phase modulator;Interference light returns coupler and converts light intensity signal into analog voltage signal by detector;By the detector signal demodulation of the rising half cycle and the falling half cycle of triangular wave signal, the optical fiber ring transit time error Δt is obtained;Adjust the square wave bias modulation signal period, when the error is zero, half of the square wave bias modulation signal period is the optical fiber ring transit time.The application can realize high-precision detection of optical fiber ring transit time by adjusting FPGA software only, realizes on-line closed-loop control of gyro control period while not affecting the angular rate measurement function of optical fiber gyro.

The utility model discloses an optical cable distribution box for bearing multiple services, which comprises a box body and a box door, cable passing holes are distributed at the bottom end of the box body, and a special line service area and a common service area are divided in the box body; a fusion and distribution integrated tray is fixedly installed in the special line service area, a turnover structure which is arranged in a stacked mode is assembled on the fusion and distribution integrated tray in a rotating mode, and fiber coiling split rings are fixedly installed on the peripheral side of the fusion and distribution integrated tray and the turnover structure respectively. At least two groups of optical splitter slots are arranged in the common service area; fiber coiling devices are correspondingly arranged on the side part of the fusion and distribution integrated tray in the special line service area and on the side part of the optical splitter slot in the common service area respectively; different optical fiber service types can be integrated in one fiber distribution box, so that an operator can compete for customer resources and quickly open related services, the utilization rate of optical cable fiber core resources is improved, wiring in the box body is regular and orderly, later maintenance is facilitated, the working efficiency is greatly improved, and the operation and maintenance cost is reduced.

Methods and systems for measuring low speed angular rotation of a fiber optic gyroscope. A beam of light waves is split into a first path and a second path. The light waves of the second path are directed through a fiber circulator and split into a third and a fourth path. The third path and fourth path are coupled into opposite ends of an optical fiber coil to circulate clockwise and counterclockwise. Rotation of the fiber optic gyroscope generates a phase shift between the clockwise and counterclockwise light waves, which are recombined and fed back through the fiber circulator. The recombined waves are amplified, recirculated into the second path to increase the phase shift and transmitted along the first path to an optical spectrum analyzer which generates an interferogram. A microprocessor applies an FFT, measures the spacing of frequency components, and determines the angular rotation speed of the gyroscope.