10 results about "Fiber optic communication systems" patented technology

The present disclosure relates at least to optical frequency hopping for channel presence detection in an optical network. An optical channel monitor (OCM) for optical channel attenuation detection in a fiber optic communication system and a method of using the OCM are disclosed, comprising: (a) heterodyne sampling of an optical signal from an optical fiber with light from a light source, the frequency of the light from the light source varying at a constant slope over time; (b) suspending the sampling in step (a); (c) after step (b), heterodyne sampling of the optical signal with light from the light source by frequency hopping; (d) concurrently with step (c), sampling, by the controller, the response of the optical signal to each frequency jump in step (c); and (e) in response to determining, by the controller, that at least one sample in step (d) exceeds a predetermined tolerance or range of the sample, the controller generates an error signal.

The application discloses an inter-cabin optical fiber communication system suitable for a high-voltage interlocking system, and the inter-cabin optical fiber communication system comprises a link cabin and a control cabin, the control cabin comprises a controller, the link cabin comprises a plurality of power units and a sub-control board, the sub-control board is connected with the controller through a high-speed optical fiber, and each power unit is connected with the sub-control board through a low-speed optical fiber. Through the application, the problem of inter-cabin communication of the high-voltage interlocking system is effectively solved, and the safe and stable operation of the high-voltage interlocking system is ensured.

The invention provides a distributed optical fiber sensing system and an optical fiber communication system, and the system comprises a pulse light unit, a first spatial light modulator, a circulator, a temperature measurement unit, and a controller. The controller is used for receiving the anti-Stokes Raman scattering light and the Stokes Raman scattering light to obtain temperature information of the optical fiber to be measured according to a preset rule, and is also used for obtaining pre-compensated spatial phase distribution through a preset optical fiber mode intrinsic equation, transverse refractive index distribution of the optical fiber to be measured and a coupling effect among modes of the optical fiber; the pre-compensated spatial phase distribution is sent to the first spatial light modulator; and the first spatial light modulator is used for modulating the pre-compensated spatial phase distribution into the pulsed light incident from the pulsed light unit so as to carry out spatial filtering and shaping on the pulsed light, realize mode coupling pre-compensation and inhibit the generation of mode coupling, thereby alleviating the problem of deterioration of the spatial resolution of the multimode distributed temperature sensing system.

This invention provides a clock leakage compensation method and system for optical fiber communication systems, comprising: Step S1: establishing a training dataset and constructing a learnable digital signal normalization structure; Step S2: training the learnable digital signal normalization structure using the training dataset; Step S3: using the trained learnable digital signal normalization structure to implement clock leakage compensation and deploying it in the optical fiber communication system. This invention constructs a learnable digital signal normalization structure, a training method, and a deployment process. The method and system can be used to compensate for clock leakage in optical communication systems and improve the transmission system performance of optical fiber communication systems.

The application provides a star waveguide and an optical fiber communication system, wherein the star waveguide comprises a silica cladding layer, a central waveguide and a plurality of satellite waveguides arranged in the silica cladding layer; the central waveguide is used for receiving input light, and is arranged in a cuboid structure, and the propagation direction of the input light is parallel to the length direction of the central waveguide; the plurality of satellite waveguides are arranged in the silica cladding layer, and are arranged in a cuboid structure; the satellite waveguides are arranged on both sides of the central waveguide in the width direction, and are arranged on both sides of the central waveguide in the height direction; the plurality of satellite waveguides are arranged in parallel with the central waveguide in the propagation direction of the input light; the plurality of satellite waveguides are coupled by the central waveguide through evanescent waves, the coupling efficiency of the plurality of satellite waveguides is the same, and the input light coupled out is output by the plurality of satellite waveguides. The star waveguide can replace a beam splitter, so that the loss is reduced.

The invention provides an optical isolator and an optical fiber communication system, and belongs to the technical field of optical fiber communication. The optical isolator comprises two tail fibers and an isolator body, the isolator body is located on an optical path between the two tail fibers, each tail fiber comprises a plurality of fiber cores, in projections of the fiber cores in a target plane, the distance between a first projection and a second projection meets the inter-core crosstalk isolation condition of a reverse light beam, and the distance between the first projection and the second projection meets the inter-core crosstalk isolation condition of the reverse light beam. The target plane is the plane where the optical wedge angle of the isolator body is located, and the first projection and the second projection are two projections with the largest distance in the projections of the multiple fiber cores in the target plane. By adopting the optical isolator disclosed by the invention, the inter-core crosstalk of a reverse light beam can be reduced.

Systems, methods, and other embodiments associated with a multicore fiber optic device for deployment in the field and in harsh environments. In one embodiment, an optical fiber device includes an optical fiber strand configured to include a light guiding core. The light guiding core is positioned within and enclosed by the optical fiber strand and provides an optical waveguide. The optical fiber device can further include an outer protective layer configured to enclose the optical fiber strand and the light guiding core. In the example optical fiber device, the optical fiber strand, the light guiding core, and the outer protective layer extend along a same axis. The optical fiber device can be configured to include multiple light guiding cores, protection layers, and deployment layers for field deployment and protection from harsh environments.

The application provides an edge-coupling beam splitter and an optical fiber communication system. The edge-coupling beam splitter comprises a silicon substrate layer, a silicon dioxide buried oxygen layer and a silicon dioxide wrapping layer. The silicon substrate layer is arranged below the silicon dioxide wrapping layer, and the silicon dioxide wrapping layer is arranged above the silicon dioxide buried oxygen layer. A beam splitter layer is arranged in the silicon dioxide wrapping layer. A first end of the beam splitter layer is provided with an input end. The input end is connected with an optical fiber. Input light is transmitted to the input end from the optical fiber. The beam splitter layer is provided with a plurality of silicon waveguide layers and a plurality of silicon nitride layers. The silicon waveguide layers and the silicon nitride layers are arranged alternately. The width of each silicon nitride layer is continuously and monotonously decreased along the input light transmission direction. The width of each silicon waveguide layer is continuously and monotonously increased along the input light transmission direction. Each silicon waveguide layer is provided with an output end. The application can reduce the occupied area of the chip and reduce the influence of the angle on the performance of the chip.

The invention relates to the field of communication, in particular to a distributed optical fiber communication system and method.When a master controller and a slave controller execute a handshake mechanism to establish communication connection, the master controller is configured to send a pulse signal to the slave controller and wait for response of the slave controller; when the number of the pulse signals fed back by the slave controller is detected, receiving and recording the own code sent by each slave controller, and performing cyclic redundancy check; after the cyclic redundancy check is passed, the code of the master controller is sent to the slave controller; and a control instruction is sent to each slave controller according to the power supply control strategy, and the slave controllers carry out current or voltage regulation on the power supply modules according to the control instruction, so that current-sharing and voltage-sharing output of the distributed power supply system is realized. According to the system, a dual-channel mode and bidirectional three-way handshake communication are designed, so that the communication reliability is greatly improved while the communication rate is ensured, the adjustment of a control strategy on a power supply is improved, and the stable operation of a power supply system is ensured.

The present invention discloses a passive coherent long-wave infrared radiation sensing photon integrated device, belonging to the field of infrared sensor device technology. The device comprises a substrate layer, an optical isolation layer, an optical transmission layer, and a metal structure layer arranged from bottom to top; the optical isolation layer is a silicon oxide layer; the optical transmission layer is a lithium niobate layer, comprising a coupled grating structure, an optical beam splitter structure, a bus optical transmission waveguide structure, a coupled waveguide structure, and a ring resonant cavity structure; and the metal structure layer is a periodic metal grating structure. The device of the present invention has a layered structure, is simple in structure, and is compatible with the processing technology of integrated photonic devices. It can directly convert long-wave infrared radiation signals into near-infrared signals in the communication band, which can be connected to optical fiber communication systems for transmission. The self-reference structure of the device can achieve coherent beat frequency of the near-infrared signal, thereby obtaining a signal output in the radio frequency domain. This greatly reduces the system testing cost while ensuring high sensitivity, and is of great significance to the development of high-performance infrared radiation photon sensors.