75 results about "Optical fiber" patented technology

A device for generating tunable light pulses has a non-linear optical fiber. The optical spectrum of femtosecond light pulses can be modified by this optical fiber, taking advantage of solitonic effects. In order to make available such a device, which makes it possible to vary the pulse energy and the wavelength of the light pulses independently of one another, an optical compressor precedes the non-linear optical fiber.

Techniques that provide cost effective optical fiber communication links for HDCP transmission systems and the like are provided. A single fiber for bidirectional communication is enabled, without wavelength selective unit to achieve the HDCP transmission. One embodiment of the present invention has a forward channel using a light source (e.g., VCSEL at about 850 nm) in the GHz modulation level (e.g., 1 GHz or greater), and a corresponding photodetector. The backward channel has a light source (e.g., LED at 630 nm) in the MHz modulation level (e.g., 10 MHz or less), and a corresponding photodetector. One application is for realizing a home entertainment system (e.g., DVD player and high definition television) that employs an HDCP-enabled communication link to transmit copy restricted digital content.

The invention relates to the technical field of cables, in particular to an aerial optical cable. The aerial optical cable comprises a central reinforcing part, at least three loose sleeves, damp-proof layers and outer protective layers, wherein the loose sleeves are distributed around the peripheryof the central reinforcing part, the damp-proof layers wrap the loose sleeves, the outer protective layers wrap the damp-proof layers in an extrusion molding mode, and at least one optical fiber is arranged in each loose sleeve. The aerial optical cable is characterized in that a hanging wire layer is arranged outside each outer protective layer, a hanging reinforcing part is arranged in each hanging wire layer, each hanging wire layer is connected with each outer protective layer through a connection rib, the hanging wire layers on two sides of each hanging wire reinforcing part are provided with identification strips, the identification strips are embedded into the hanging wire layers and have different colors with the hanging wire layers, the hanging wire layers and the outer protective layers are distributed in parallel in space, the hanging wire layers, the outer protective layers and the connection ribs are made of the same material, and the hanging wire layers, the outer protective layers, the connection ribs and the identification strips are formed in an integrated mode. The aerial optical cable has the advantages of being easy to identify, maintain and repair, low in maintaining cost, easy to manufacture, and high in percent of pass of finished products.

The invention discloses an intelligent rainwater system based on runoff simulation and multi-sensor monitoring, and an operation method. The system comprises a runoff simulation and control host basedon a GIS, a meteorological forecast and runoff satellite monitoring server, a distributed small meteorological station, a vertical surface rain condition monitor, a movable rainfall radar, an infrared video monitor, an evaporation measuring instrument, a rainwater pipe network flow monitor, a water quality online monitor, an air quality monitor, a radar rainfall monitor, an infiltration area saturation monitor, an accumulation area water level monitor, a shallow-layer underground water level monitor, a surface runoff monitor, a waterproof unmanned aerial vehicle with a speed measuring buoy, an optical fiber temperature sensing system, an optical fiber pressure sensing system, a communication module, an intelligent controller, a rainwater utilization facility water supply point, a high-position rainwater hydroelectric generation module, a submersible conveying pump, a pressurization infiltration device and the like. According to various parameters, the rainfall flood disasters are subjected to scientific early warning and warning, and measures are adopted, so that the disaster risk of rainfall flood disasters to a building area or a building can be reduced.

An optical fiber 13, of which one end 13a is optically coupled to a laser light source 12, for propagating, from the one end 13a to other end 13c, a laser light emitted from the laser light source 12, and a light-guiding plate 11 including a light-guiding section 11b in which a plurality of right prisms of the same shape for extracting the laser light by contacting the optical fiber 13 are arranged parallel to each other in the same direction at equal intervals, and also including a planar section 11c for diffusing the laser light extracted from the light-guiding section 11b and emitting the diffused laser light from one main surface, are provided. The optical fiber 13 is bent more than twice to form a plurality of straight line portions arranged parallel to each other at unequal intervals, and the optical fiber 13 and the light-guiding plate 11 are positioned such that the laser light is extracted at equal intervals from each of the plurality of straight line portions.

The invention provides a method for dynamically calibrating a distributed optical fiber temperature sensor system. The method comprises the following steps: (1) eliminating the output voltage deviation of the detecting system; (2) eliminating the effect caused by instability of the amplification factor of the detecting system by a standard optical fiber ring; (3) dividing the corrected anti-Stokes signal by the Stokes signal to obtain the accurate calculation formula for solving the temperature to be measured T of the optical fiber temperature sensor in combination with the theoretical formula; and (4) carrying out linear fitting on the formula obtained in the step (3), correcting the formula by dynamic calibration in real time and then calculating the temperature, thus obtaining the accurate information of the temperature to be measured. Higher temperature precision of the distributed optical fiber temperature sensor system can be ensured by adopting the method.

This invention provides a fault indication technology used to Ethernet optical fiber transceiver. It includes following step: adds the control circuit in the transceiver, the control circuit is used to test and control the working state of Ethernet electrical interface and optical interface. To implement the fault indication, the control circuit connects to the interface circuit of Ethernet through the LINK signal, through connecting SD and TX-DIS with the optical interface circuit of Ethernet, makes real time test to the state of receiving the optical signal in the optical fiber interface and the state of network connection in the RJ45 interface, and reports the working state of the link according to the result of testing. The control circuit implements the report of the fault indication to the remote equipment through controlling the working state of the optical fiber sending circuit.

The invention provides a double-fiber ball-shared coupling micro-measuring-force targeting sensor with an end face micro-structure, and belongs to the technology of precision instrument manufacture and measurement. The sensor comprises a laser device, a beam expanding collimating mirror, a fiber coupling lens, a guide pipe, a microscope objective, a CCD camera, a computer and a probe composed of an incidence fiber, a coupler and an outgoing fiber with the conical end face micro-structure. The coupler serves as a contact of the probe, and light beams are led out through the outgoing fiber with the conical end face micro-structure after being led into the coupler through the incidence optical fiber. The light beams which are led out enter the CCD camera through the microscope objective. The light spot energy center positions formed by the outgoing light beams on the CCD camera can be obtained through the image processing technology, and the targeting condition of the sensor in the space can be obtained through the one-to-one correspondence relation between the light spot energy center positions on the CCD camera and the spatial positions of sensor contacts. The outgoing fiber in the probe of the sensor is provided with the end face micro-structure, the signal to noise ratio of a detection signal is greatly increased, and the measurement resolving power of the sensor is improved.

The invention discloses an intelligent monitoring device for temperature and insulation state of a 330KV high-voltage cable in a hydropower station. The device is characterized by being provided with a central processing module unit (CPU), a data acquisition and conversion unit, a light transmitting/receiving module, an alarm output module, a plurality of optical fiber temperature sensors and a plurality of current sensors, wherein the data acquisition and conversion unit is used for transmitting digital signals to the CPU under the control of the CPU; the light transmitting/receiving module is used for transmitting electrical signals to the data acquisition and conversion unit; the alarm output module can be used for communication with a remote monitoring system; the optical fiber temperature sensors are respectively arranged at the joints of the high-voltage cable to be detected and used for connecting temperature detection signals to the light transmitting/receiving module; and thecurrent sensors are respectively arranged on joint metal sheaths of the high-voltage cable to be detected and used for connecting current detection signals to the data acquisition and conversion unit. The device is particularly suitable for safety monitoring of the 330KV high-voltage cable in the hydropower station, can realize real-time monitoring of the temperature and the insulation state of the cable in the hydropower station, and can also ensure self safety.

The invention provides a monitoring method of the internal stress of a spacecraft composite material structure in an aging process. The method includes following steps: step1, placing carbon fiber prepreg, a special optical fiber, carbon fiber prepreg, demolding cloth, and adhesive-absorbing felt on a molding mold of the spacecraft composite material structure in sequence, and performing integral sealing by employing a vacuum bag; step 2, performing curing by employing an autoclave process, performing demolding after cooling, and obtaining the spacecraft composite material structure implanted with the special optical fiber at the inner part; and step 3, placing the spacecraft composite material structure in a clean factory building, and performing aging treatment on the spacecraft composite material structure by employing a natural aging method. According to the method, based on a back Rayleigh scattering principle, the special optical fiber is implanted in the spacecraft composite material structure, the monitoring of the internal stress in the aging process is realized by employing an optical frequency domain reflection technology, the spatial resolution is high, the measuring precision is high, the repeatability is good, and basis is laid for improvement of the aging method of the spacecraft composite material structure and the improvement of the dimension stability.

A cable assembly, comprising a housing having a plurality of receiving grooves recessing forwardly from a rear surface thereof, a plurality of lenses located on a front surface of the housing, a plurality of conductive terminals received in the housing and arranged in two rows, a cable electrically connected to the conductive terminals and a plurality of optical fibers received in the receiving grooves and alignment to the lenses, respectively. The receiving grooves are located between two rows of the conductive terminals.

A system, apparatus and method for testing optical fiber systems by providing a near-end and far-end harness that loops the set of fibers in the fiber system together. The near-end harness has an interface to connect to the tester. The tester then effects testing on the entire set of fibers, which are looped together by the configuration of the two harnesses creating a single optical path that traverses the entire set or subset of fibers in the network, so a launched test signal propagates through the entire set of looped fibers, providing measurement results for the fibers.

The invention discloses a novel microchip laser supporting optical fiber output, which belongs to the fields of laser technology and non-linear optics. The novel microchip laser mainly comprises a laser diode pumping source, an optical fiber output system, an optical collimation system, a laser light gain medium and optical elements, wherein pump light enters the optical collimation system for collimating after passing through the optical fiber output system, and is focused onto the gain medium; the film-plated optical elements are arranged in front of and behind the gain medium; the gain medium and the film-plated optical elements in front of and behind the gain medium construct a laser resonant cavity with a sandwich structure; laser light generated by the laser resonant cavity returns along the incident direction of the pump light, passes through the optical collimation system once again, and is output through the optical fiber output system. The novel microchip laser has the characteristics that optical fiber output is performed during the use of an optical fiber pump without any additional output device in a sandwich microchip structure, and a fiber-core pump or a cladding pump can be adopted, so that the flexibility of a system is improved greatly; and meanwhile, the structure can also be applied to pulse modulation of materials such as semiconductor saturable absorbing mirrors, single-wall carbon nanotubes or graphene and the like, and stable pulse output is realized.

The invention discloses a three-dimensional shape measuring system of fringe projection based on a sine phase modulation four-step integral, and relates to the field of three-dimensional shape measuring. The method includes the steps that an optical fiber interference fringe projection mathematical model is built; a phase error compensation system extracts phase drift amount caused by environment factors, and phase compensation voltage is generated and is injected into a dual-channel piezoelectric ceramic driver; a sine phase modulation signal is directly injected into the dual-channel piezoelectric ceramic driver to achieve sine modulation of a fringe phase, injected into the phase error compensation system to serve as a phase generation carrier and injected into a CCD time sequence controller to serve as a reference signal of the CCD time sequence controller, a time sequence generated by the CCD time sequence controller controls a planar array CCD camera to collect a fringe image on the surface of an object to be measured, the image is uploaded to an image processing and shape restoring system, and finally surface shape reconstruction of the object is achieved. The method meets the technical requirements for non-contact, full view, quickness, high precision and the like of multiple application fields.

A sensing and data acquisition system may provide a sensing assembly including a signal conditioner to receive an electrical signal from a sensor affixed onto an asset and supply an encoded digital representation of a sensed parameter. An acoustic modem may be connected to the signal conditioner to receive the encoded digital representation of the sensed parameter and transmit an acoustic signal based on the encoded digital representation of the sensed parameter. A data acquisition line may be proximate to the asset and may be non-contactively coupled to the sensing assembly. The data acquisition line may include an optical fiber acoustically coupled to the acoustic modem and responsive to the encoded digital representation of the sensed parameter transmitted by the modem to effect an optical change in an acoustically-responsive portion of the fiber. The optical change may be measurable to detect the encoded digital representation of the sensed asset parameter.

The invention discloses a well-ground seismic data joint acquisition system based on distributed optical fiber acoustic wave sensing and a well drive data processing method. In order to solve the problems of inconsistent energy, inconsistent frequency spectrum and incompletely consistent coupling between a seismic source and the ground caused by repeated excitation of each seismic source point when seismic data in a well and seismic data on the ground are respectively acquired in the prior art, the invention discloses an in-well-ground seismic data combined three-dimensional acquisition systemformed by a distributed optical fiber sound wave sensing seismic data acquisition unit and a ground seismic data acquisition unit. In-well-ground combined three-dimensional exploration is carried out, ground and in-well seismic data are synchronously collected, the high-density, high-benefit, high-resolution and low-cost well-ground combined three-dimensional seismic exploration technology is achieved, and oil and gas resource exploration and comprehensive evaluation are carried out.

The invention discloses a system and a method for monitoring the optical fiber fuse effect. The system comprises a laser module, a linear swept source module, a light power injecting module, a Mach Zehnder interferometer module, a photoelectric detecting and data acquiring module and a swept source feedback controlling module, wherein swept light generated by the linear swept source module enters the Mach Zehnder interferometer module and is divided into probe light and reference light; a light signal generated by the laser module and the probe light are coupled in the light power injecting module and then enters a to be monitored optical fiber link, and signal light returned to the light power injecting module from the optical fiber link enters the Mach Zehnder interferometer module for interference beating with the adjusted reference light, and is input into the photoelectric detecting and data acquiring module; the feedback controlling module is used for controlling the laser module; the data acquiring module is used for performing later data processing, judging the occurrence of the optical fiber fuse effect and obtaining the position of a fault point through calculation. By means of the system and the method, monitoring is rapid and accurate, and the length and the position of a damaged optical fiber can be accurately determined.

The invention relates to an optical network resource management method based on scanning codes. The optical network resource management method solves the problems that in the prior art, the information obtaining of network resources excessively relies on a specific network; and meanwhile, the permission of users is not limited, so the confidentiality of network resources can be reduced. The optical network resource management method based on scanning codes has the main technical scheme that optical network resources are managed through two-dimension code labels, a scanner with input, display and communication functions, a communication network and a resource management server; the scanner scans the two-dimension code labels; and the scanner is in communication connection with the resource management server through the communication network. The optical network resource management method based on scanning codes has the advantages that complete, clear, secure, convenient, fast and intelligent managements to optical network physical resources and logical resources are realized, front end and back end bridges are built, and the optical fiber network management updating is promoted.

The invention provides an all-optical threshold device based on two-dimension material saturated absorption effect. The device comprises an optical amplifier arranged in the light transmission direction, and a saturable absorber connected with the optical amplifier, wherein the saturable absorber comprises an optical waveguide and a two-dimensional material covering the surface of the optical waveguide. The device is quite simple in structure, non-linear optical fiber or non-linear PPLN semiconductor devices are not needed, and the defects of the prior art that loss is large, stability is poor and cost is high are overcome. By the adoption of the device, the signal to noise ratio of received signals is increased, signal quality is improved, and the reception judgment performance of an optical communication system can be improved. The invention further provides a method for preparing the all-optical threshold device. The method comprises the steps of coating the surface of the optical waveguide with the two-dimensional material to form the saturable absorber, and connecting the optical amplifier with the saturable absorber through optical fiber to form the all-optical threshold device based on two-dimension material saturated absorption effect. The all-optical threshold device can be used for all-optical signal processing.

A method for fabricating an optical fiber impulse sensor having an optical fiber and a molded portion molded around the perimeter of the optical fiber. The method forms, in the molded portion, an optical fiber insertion hole and an optical fiber insertion slit for inserting the optical fiber into the optical fiber insertion hole. The method inserts the optical fiber from the slit into the optical fiber insertion hole.

The invention relates to the technical field of optical fiber access, in particular to an optical splitter no-jumper-connection distribution box and a wiring method thereof. The optical splitter no-jumper-connection distribution box structurally comprises a box body, wherein a wiring board is arranged on a top plate at the top inside the box body; a box-type optical divider fixing module is arranged on a right side plate in the box body; a right guide rail plate bracket is arranged on a right side plate in the box body; a right slide rail plate is arranged on the right guide rail plate bracket; a baseplate mounting plate is arranged at the lower part in the box body; a left slide rail plate is arranged between the top plate and the baseplate mounting plate; a 12-core fused and matched integrated module is erected between the left guide rail plate and the right guide rail; a wire management ring bracket is arranged on the left side of the left guide rail plate; wire management rings are arranged on the wire management ring bracket; a baseplate is arranged below the baseplate mounting plate inside the box body; and a ground plate is arranged on the baseplate, and is provided with optical cable stripping devices. The optical splitter no-jumper-connection distribution box and the wiring method thereof can realize the maximum capacity of wiring for optical cables; an optical fiber circuit can be distinct and clear, without winding; and an optical network signal route can be randomly exchanged, and the routine maintenance is facilitated.

The invention relates to a marine low-smoke halogen-free low-toxicity frame-retardant fire-resistant soft optical cable and a manufacturing method thereof, and belongs to the technical field of optical communication special optical cable manufacturing. The marine low-smoke halogen-free low-toxicity frame-retardant fire-resistant soft optical cable is a special fire-resistant optical cable for data communication, and is composed of ultra-low-loss low-temperature-resistant tightly-sleeved optical fiber units, a high-modulus aramid fiber and waterproof aramid fiber mixed reinforcing piece, a halogen-free low-smoke flame-retardant polyolefin oxygen-isolation layer inner protective sleeve, a fire-resistant white mica tape wrapping layer, a stainless steel wire woven wire layer and a crosslinked polyolefin outer protective sleeve. The ultra-low-loss low-temperature-resistant tightly-sleeved optical fiber units are twisted, high-modulus aramid fiber and waterproof aramid fiber are adopted for making the high-modulus aramid fiber and waterproof aramid fiber mixed reinforcing piece, the oxygen-isolation layer inner protective sleeve wraps the reinforcing piece in an extruded mode, the fire-resistant white mica tape wrapping layer wraps the oxygen-isolation layer inner protective sleeve, stainless steel wires are woven outside the fire-resistant white mica tape wrapping layer to form the stainless steel wire woven wire layer, and the crosslinked polyolefin outer protective sleeve wraps the fire-resistant white mica tape wrapping layer and the stainless steel wire woven wire layer in an extruded mode.