60 results about "Optical power budget" patented technology

A system for calibrating a plurality of optical modules includes a plurality of optical signal sources and optical signal degradation elements optically communicating with input switches. The input switches supply optical test signals to optical modules (units under test) plugged into a common shelf. Calibration switches including variable optical attenuators may be used to adjust the input signal levels and alternately supply adjusted signals to an optical power meter and the units under test. A controller is used to control the adjustment and thereby provide defined, measured signal levels to the units under test. By reading data from the units under test and using these defined signal levels, the optical modules may be calibrated or diagnosed. Output optical switches are used in a similar fashion to calibrate or diagnose the outputs of the units under test. In addition to input/output power calibration, the invention may also perform wavelength calibrations.

The invention relates to a fibre core loss measuring method and system of a heterogeneous optical fusion welding point. The loss measuring system mainly consists of two light sources and two optical power meters. The fibre core loss measuring method comprises the following steps of: respectively connecting the light source to one end of each of different types of optical fibres, respectively connecting the optical power meter to the other end of each of the different types of the optical fibres, and obtaining optical power values Ra and Rb when the two optical fibers are directly connected; keeping the connection between the optical fibre tips and the optical power meters unchanged and the output power of the light sources unchanged, respectively cutting off the two optical fibers from the middle parts and carrying out fusion welding in a crossed way, and reading numerical reading of the optical power meters again to obtain optical power values Ras and Rbs after crossed fusion welding; and obtaining the average loss: [(Ra+Rb)-(Ras+Rbs)]/2 at the heterogeneous optical fiber fusion welding point through calculating according to the measured data. The fibre core loss measuring method is simple and effective, and has high precision and active roles and can be used for effectively measuring and estimating the fusion welding loss of different types of optical fibres.

The invention relates to an all-optical dispersion monitor based on an optical parameter amplifier. The all-optical dispersion monitor comprises a semiconductor laser, a coupler, the optical parameter amplifier, an output optical filter and an optical power meter. The semiconductor laser emits low-power continuous detection light. The continuous detection light and signal light are combined through the coupler and are filled into the optical parameter amplifier. The optical parameter amplifier is based on first-order four-wave mixing effect which causes energy to be transferred to detection waves and idle waves from the signal light. The detection waves and the idle waves with exponential gains are output, pass through the output optical filter and are measured by the optical power meter. The invention has the advantages that the response speed is fast, the sensitivity is high, the working waveband is wide, the signal rate and the modulation format are transparent, the monitor can be used for the dispersion monitoring of a WDM system with single channel rate above 100Gb/s, the high-speed photoelectric device and the signal processing circuit are not required during measurement, and the cost of devices is reduced.

The invention discloses an automatic control system for aligning and coupling an optical fiber and an electrooptical modulator. The system comprises a tunable laser, an optical power meter, the electrooptical modulator, a polarization-preserving optical fiber, a regulating frame, a step motor controller, a general-purpose interface bus (GPIB) card, a GPIB cable, a serial port communication cable and a computer. The tunable laser is connected with input optical fibers, the optical power meter is respectively connected with the output optical fibers, the electrooptical modulator is arranged among the input optical fibers and the output optical fibers, the input optical fibers and the output optical fibers are fixed on the regulating frame which is connected with the step motor controller, the step motor controller is connected with the GPIB card in the computer through the GPIB cable, and the optical power meter is connected with the computer through the serial port communication cable. The invention solves the problems that the traditional manual regulation of optical fibers has long time and the optical fibers are not aligned easily and cannot be precisely positioned due to the disturbance from external environments.

A testing apparatus for testing optical components includes an optical transmitter, an optical attenuator, an optical power meter and an optical receiver which are substantially rigidly coupled in a fixed relation to each other within a single housing. The system permits the common control of all the optical components such that calibration, testing and troubleshooting may be performed using a common user interface. The testing apparatus is unitary, compact and portable, and is a much more robust testing apparatus than conventional schemes.

The embodiment of the invention discloses a signal processing device in a passive optical network, which comprises a first optical splitter 204, a mode coupling unit 203, an optical signal enhancing module 206 and a second optical splitter 202, wherein the first optical splitter 204 is used for combining multiple paths of uplink optical signals; the mode coupling unit 203 is used for performing low loss convergence on multiple paths of single-mode optical signals or single path of multi-mode optical signals by matching the modes of the uplink optical signals combined by the first optical splitter 204 according to the principle of optical field matching and convergence of multiple single-mode optical fibers; the optical signal enhancing module 206 is used for amplifying the optical signals converged by the mode coupling unit 203; and the second optical splitter 202 is used for combining the optical signals amplified by the optical signal enhancing module 206. The embodiment of the invention also discloses a passive optical network and a signal processing method. Therefore, the uplink optical power consumption can be greatly reduced, and a high optical power budget is obtained in a low-cost mode.

The embodiment of the invention discloses an optical power alarming method and equipment, which relate to the technical field of networks and aim to solve the problem that a judgment result is uncertain to a certain extent because the optical power of an optical signal received by receiving equipment is required to be judged whether to exceed the range of optical power tolerable for the receiving equipment or not by the experiences of engineers in an equipment mounting process. The technical scheme provided by the invention comprises the following steps of: acquiring the optical power of an actually received optical signal; comparing the optical power of the actually received optical signal with a rated received optical power range; and if the optical power of the actually received optical signal exceeds the rated received optical power range, transmitting an abnormity alarming message to the transmission equipment of the optical signal. The optical power alarming method, the equipment and an optical power alarming system provided by the embodiment of the invention can be applied to packet communication networks.

The invention relates to a wavelength division multiplexing passive optical network optical fiber link distributed protection device. An optical line terminal is connected with a remote node through a working feed-in optical fiber and a protection feed-in optical fiber. N de-multiplexing ports of the remote node are respectively connected with N working distributed optical fibers, and the N de-multiplexing ports are respectively connected with N protection distributed optical fibers. Each optical network unit comprises a monitoring and control unit, a first optical coupler, a downlink receiver, and a reflective semiconductor optical amplifier. Each monitoring and control unit comprises an optical power detector and an optical switch. The N working distributed optical fibers and the N protection distributed optical fibers are connected with the reflective semiconductor optical amplifiers and the downlink receivers through the monitoring and control units via the first optical couplers respectively. According to the invention, a colorless optical distribution network is realized, the use of an independent light source is avoided, the complexity and cost of equipment are reduced, and unlink and downlink services of other users are not affected during protection of switching protection.

The invention discloses a method for monitoring channel state in real time by measuring optical power on line, which comprises the following steps of: (1) measuring an optical power-optical intensity curve table of an optical module in advance, and storing in a microprogrammed control unit (MCU); (2) integrating an optical intensity detection and conversion circuit in the optical module, establishing an A/D conversion circuit, and ensuring the measurement accuracy of A/D conversion on small signals by adopting a segmental amplification mode; (3) obtaining an A/D conversion result, and calculating an optical power value by adopting curve fit technology; and (4) establishing a perfect channel state monitoring and warning mechanism according to the optical power measuring result and the change conditions. The method for measuring and calculating the optical power on line fulfills the aim of detecting the optical power in real time on line under the condition of not disconnecting a fiber channel.

The present invention provides an optical power measuring apparatus capable of monitoring the status, such as cleanness, of an optical fiber contact end face. The disclosed optical power measuring apparatus includes a microscope camera module, an illuminating module, an optical element, an optical power detection unit, a display unit and a central processing unit. The present invention may switch between optical fiber contact end status monitoring and optical power measurement. The apparatus can simplify the complicated steps for an optical fiber to insert to and pull from an optical microscope and then insert to an optical power meter. It can help a user to measure the correct optical power rapidly.

The invention discloses an extinction ratio (ER) measurement device. The characteristic that the high optical power P1 of a transmitter of an ordinary optical module is dozens of times low optical power P0 is utilized, and after an optical signal to be tested is converted into an electrical signal, an electrical signal representing 0 works in a linear amplification area of a transimpedance amplifier, and an electrical signal representing 1 works in a saturation area of the transimpedance amplifier; a saturated peak is filtered, an only the electrical signal representing 0 remains; the P0 is calculated by an upper computer; and then an ER can be simply calculated according to Pavg measured by an optical power meter. All devices used for the device are low in cost; and therefore, compared with an oscilloscope, the device can realize the rapid measurement of the ER with low cost, and is favorable for large-scale production and application.

The invention is applicable to the technical field of optical power measurement, and provides an optical power measurement device. The device comprises an optical power measurement unit, an optical splitting unit and an interface, wherein the interface comprises an LC interface of external Huawei SDH transmission equipment and ZTE OTN transmission equipment, an FC interface of external NEC SDH transmission equipment, an SC interface of external ECI SDH transmission equipment and an ST interface of external relay protection transmission equipment; the LC interface, the FC interface, the SC interface and the ST interface are all connected with the optical splitting unit; the optical splitting unit is connected with the optical power measurement unit; and the power measurement value of optical power measurement device is the sum of the test value of the optical power measurement unit and the loss value of the optical splitting unit. Through adoption of the above scheme, the FC, LC, SC andST interfaces can be measured directly, thereby improving the convenience of work, reducing the uncertain loss of a movable joint of tail fiber, and improving the accuracy of the optical power value.

The invention is applicable to the field of optical communication and provides a mode coupling light assembly. The assembly comprises a collimator array, an aspherical lens and a photoelectric detector, wherein the collimator array collimates an optical signal transmitted from each path of optical fiber into parallel light; and the aspherical lens converges the collimated parallel light to the photoelectric detector. The collimator array is needed to meet the requirement that the cross section of emergent beams is smaller than a clear aperture of the aspherical lens, and the converging angle is needed to accord with a numerical aperture of the photoelectric detector after the light is converged by the aspherical lens. In the embodiment of the invention, the mode coupling light assembly couples a plurality of paths of optical signals transmitted by fiber nodes to the photoelectric detector of an optical receiving assembly of optical cable terminal equipment in a low optical power penalty mode, additional loss brought by an optical coupler is avoided, and the optical power budget in an optical fiber transmission network is improved; therefore, the assembly contributes to improving the splitting ratio and increasing the transmission distance in a passive optical network.

A method of adjusting the attachment of an optical fiber to a laser diode chip within a butterfly package, or any equivalent package, identifies the location of the solder attachment on the optical fiber, thereby moving one or more high power lasers so that their respective beams are incident on the solder attachment. Then, with the application of high power laser pulses according to a predetermined pulse schedule, the solder attachment is heated so that the optical fiber may shift vertically therein. By using an internal or external monitoring means such as an optical power meter, a determination is made when the optical alignment has reached a desired threshold such as when it exceeds a desired optical power output. The pulse schedule may be performed multiple times until a substantially optimized coupling is achieved for the final package.

The invention discloses light intensity fluctuation monitoring equipment. A photodiode is used for converting input optical signals into the optical current proportional to the input optical power; a program control I/V conversion module is used for converting the optical current into certain voltage signals; an A/D conversion module is used for performing A/D sampling on the voltage signals and transmitting the sampled data into an MCU; after quantification, the MCU is used for quantifying the sample data, converting into an optical power value, transmitting the optical power value to an LCD for displaying and caching points corresponding to the acquired sampled data, the LCD is used for drawing the point values on a coordinate graph, all the points are connected to form a straight line, and the change of the light intensity can be acquired directly according to change and fluctuation of the line. The invention further discloses a light intensity fluctuation monitoring method. The equipment has the advantages of high intelligence level, high accuracy and high flexibility, and optical power measurement of wide dynamic range and high accuracy and consumption measurement of high resolution can be performed; the equipment can be applied to detection of optical communication equipment, optical fibers and optical passive devices and further has the advantages of wide power range, high cost efficiency, high reliability, simple operation and high testing accuracy.

The invention relates to a simulation signal optical fiber communication system with hot backup and a use method thereof. An optical transmitter of the system comprises one electric signal power divider and two optical transmitting modules, or comprises one optical transmitting module and one optical divider; and a receiver comprises two optical receiving modules, an AD module, a microprocessor and one microwave switch, or comprises one optical switch, one optical receiving module, an AD module and a microprocessor. The use method comprises the following steps: the optical transmitter inputs one path of simulation signal and outputs two paths of optical signals, the microprocessor of the optical receiver monitors the receiving optical power of the current optical receiving module according to the threshold of the lowest optical power value of reliable communication, switches the microwave switch or the optical switch, and selects one of the two optical signals with receiving optical power greater than or equal to the threshold value as a simulation signal for output. The system can be manually switched due to allocation of a display screen. The system can automatically produce a hot backup optical signal, and can select one path with normal transmission according to the receiving power, thus effectively ensuring communication reliability and stability.

One embodiment can provide an optical transceiver based on silicon photonics. The optical transceiver can include an optical transmitter and an optical receiver. The optical transmitter or the optical receiver can include one or more semiconductor optical amplifiers (SOAs) configured to amplify optical signals to be transmitted by the optical transmitter or optical signals received by the optical receiver, respectively, thereby facilitating the optical transceiver to meet an optical power budget requirement of a high-speed optical link.

Waveguide optical coding device for optical ADC belongs to the optical technical field and relates to the optical signal treatment and integrated optical device. The device is composed of 2-1 longitudinal waveguides and N horizontal waveguides integrated by one chip, the longitudinal waveguides and the horizontal waveguides are connected by waveguide connecting structural units A, B or C, or connected in a right-angled intersection manner or not connected. The invention is substantially based on an optical total internal reflection principle and designs different waveguide connecting structural units for realizing optical transmission and optical power budget, and the spatial positions of the waveguide connecting structural units on the coder correspond to the binary coding thereof so as to accomplish the coding process in ADC. The waveguide optical coding device for optical ADC provided in the invention has the advantages that the coding speed is quick, the performance is stable and reliable, the design is simple, the manufacturing difficulty is low, the cost is low, the volume is small and the like; and the coder and the waveguide array grating can be integrated. Thus, the invention is in favor of improving the stability and reliability of the system and reducing the cost.

The invention provides an optical fiber coupling method based on a CCD and an optical power meter. A system comprises a tilting mirror, an image acquisition module, the optical power meter and a controller module, and the method aims at solving a problem that the convergence speed of a conventional optical fiber coupling method is too low. According to the method, stochastic disturbances (formula)are applied to the tilting mirror simultaneously, and the change amount of the optical power meter J after the disturbances are applied is computed, so that an approximate gradient (formula) of an objective function is obtained, a miss distance x/y of the center of a light spot is obtained through the CCD, the miss distance x/y and the approximate gradient are fused, and a corrected gradient (formula) is obtained. The corrected gradient is controlled through a stochastic parallel gradient descent algorithm, and the control amount of the tilting mirror is updated iteratively.

The invention discloses an optical power meter based on an LAN-WDM wave band. The optical power meter comprises a photodecomposition multiplexer, a photodiode detecting unit, a micro-control unit, a screen display portion and a power source. According to the photodecomposition multiplexer, a combined wave multi-wave-length optical signal is divided into a plurality of optical signals with different wave lengths; according to the photodiode detecting unit, the optical singles divided by the photodecomposition multiplexer are received through optical fibers and converted into electric signals; according to the micro-control unit, the electric signals output by a photodiode are received and processed; according to the screen display portion, the electric signals processed by the micro-control unit are displayed in a luminous power mode; according to the power source, electricity power is provided for each part. According to the optical power meter based on the LAN-WDM wave band, the luminous power of four waves with different wave lengths of the LAN-WDM wave band can be tested at the same time, reduction of testing procedures and reduction of man-made testing errors are facilitated, and the efficiency for test in batches can be improved.