38results about "Electromagnetic transmission" patented technology

A remote control uses IR (infrared) commands to control various consumer appliances made by various manufactures. The remote control is low-cost, consumer-friendly, programmable, has its own graphical display so it does not interfere with a TV or other viewing screen, and is capable of interacting with the internet or other data source to provide a rich set of functionality.

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 discloses a method and equipment for data transmission. The method includes: in the uplink direction, subjecting an uplink signal to down-sampling by an RRU (radio remote unit) according to a P/Q ratio to obtain an uplink signal with a second sampling rate, subjecting the down-sampled uplink signal to quantization compressing according to a preset compression ratio, sending the uplink signal subjected to quantization compressing to a BBU (baseband unit), and using the BBU for quantization decompressing of the uplink signal subjected to quantization compressing; and in the downlink direction, using the BBU for quantization compressing of a downlink signal with the second sampling rate according to the compression ratio, sending the downlink signal subjected to quantization compressing to the RRU, using the RRU for quantization decompressing of the downlink signal subjected to quantization compressing, and subjecting the downlink signal after quantization decompressing to up-sampling according to a Q/P ratio. By means of combination of down-sampling and quantization compressing, the volume of data transmitted through an interface Ir is effectively compressed.

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 relates to a gain control method of a distributed Raman fiber amplifier, which comprises the following steps of: firstly, acquiring the output power of a current pump and a signal light input power spectrum; then obtaining a gain error by the input power and a preset target gain, judging whether the gain error is larger than a preset threshold value or not, if so, executing the feedforward regulation on pump gain transient pre-control, or else, executing the feedback regulation on pump gain feedback control; when stepping into the feedforward regulation process, regulating the current pump and returning to the first step; and when stepping into the feedback regulation process, adjusting the current pump and returning to the first step. The invention also relates to a gain control device of the distributed Raman fiber amplifier. The gain control method and device of the distributed Raman fiber amplifier have the advantages of fast regulation speed, difficult divergence in the process, convergence time reduction and system performance improvement.

The invention discloses a method for service protection in an automatic exchange optical network, which comprises: searching the idle protection connections other than the above partial connection in the protection group when needing to switch a work service on a partial connection in the connection of the protection group; switching the work service on the partial connection onto the idle protection connection if the idle protection connection is found; otherwise, switching based on the priority of the work service on the partial connection and the priority of work services on other protection connections except for the partial connection mentioned above. The invention can completely protect the services with high priority in the automatic exchange optical network rapidly and efficiently in limited network resources, thereby complying with the service level agreement (SLA).

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.

A return path system includes inserting RF packets between regular upstream data packets, where the data packets are generated by communication devices such as a computer or internet telephone. The RF packets can be derived from analog RF signals that are produced by legacy video service terminals. In this way, the present invention can provide an RF return path for legacy terminals that shares a return path for regular data packets in an optical network architecture. The invention operates independently of a legacy upstream transmission timing scheme so that the legacy upstream transmission timing scheme can remain effective in preventing data collisions. In other embodiments, the present invention allows for less complex hardware for subscribers that are not taking data services. Further, an optical signal present line in combination with a driver may be employed in order to reduce the amount of hardware in a laser transceiver node.

Provided are a computer program product, system, and method for resource allocation in accordance with one embodiment of the present description, in which a resource allocation such as a buffer credit allocation for a port in a storage area network is initialized as a function of a measurement of a length of a communication link for the port of the storage area network. In one embodiment, the length measurement is a function of a minimum command response time of a command issued over the communication link. Other aspects of resource allocation in accordance with the present description are described.

The invention discloses a SNCP business configuration method. SNCP protection group comprises first access and second access, and establishes restoration access for first access with trouble, composes a new SNCP protection group by second access and restoration access, executes predetermined processing for SNCP business configuration under predetermined condition. The predetermined condition is that new SNCP protection group and SNCP protection group shares common access and SNCP business intersects the second access of new SNCP protection group, and that SNCP configuration of SNCP protectiongroup is modified while SNCP intersection relation is not changed in predetermined processing. The invention can reduces transient interruption times of SNCP business.

The invention relates to a separated type optical testing device based on a commonly-used mobile intelligent terminal. The separated type optical testing device comprises an operation end based on the commonly-used mobile intelligent terminal and at least one testing front end. The testing front end comprises a data acquiring unit, a data processing and controlling unit and a short-distance communication unit which are connected in sequence. The data acquiring unit is used for obtaining data of a front end circuit. The data processing and controlling unit is used for processing the obtained data and calculating and controlling the obtained data. The short-distance communication unit is used for being communicated with the operation end. The operation end based on the mobile intelligent terminal comprises a man-machine interface unit for achieving a user interface, a main control unit for finishing device management and required numerical calculation processing, a short-distance communication unit for achieving an application communication protocol between the short-distance communication unit and the testing front end, and a wide-area communication unit for achieving a long-distance application communication protocol. The separated type optical testing device can form a man-machine interface with good experience and can form testing records in real time.

Improved lumped Raman amplification systems are disclosed. A lumped Raman amplification structure provides optimized efficiency, low noise figure over a range of gain settings, and a high saturation threshold. Responsibility for amplifying different portions of the spectrum is divided among multiple stages. In one particular implementation, two outer stages amplify a first band and two inner stages amplify a second band. The two inner stages also apply a small amount of amplification to the first band. A modification improves noise figure in the second band by adding some amplification in the second band to the first stage.

With a wavelength conversion device based on a nonlinear optical effect, when arrayed waveguides including an intended nonlinear waveguide are fabricated, unwanted slab waveguides are inevitably formed. The slab waveguides can cause an erroneous measurement in the selection of a waveguide having desired characteristics from the arrayed waveguides. The erroneous measurement can lead to redoing steps for fabricating the wavelength conversion device and a decrease in the yield and inhibit the evaluation of the characteristics in selection of the waveguide and the subsequent fabrication of the wavelength conversion device from being efficiently performed. A wavelength conversion device according to the present invention includes a plurality of waveguides formed on a substrate, and a plurality of slab waveguides that are arranged substantially in parallel with and spaced apart from the plurality of waveguides, and each of the slab waveguides has a grating structure that reflects light of a particular wavelength.

A vehicle network system is provided with a plurality of star networks, a plurality of devices mounted on a vehicle are connected in a star shape through respective branch lines in each of the star networks, and a trunk line for connecting the plurality of star networks, the branch lines are communication lines for optical communications, and the trunk line is a communication line for electric communication.

A system includes a processor communicatively coupled to an Amplifier Stimulated Emission (ASE) source and an optical receiver, wherein the processor is configured to cause transmission of one or more shaped ASE signals, from the ASE source, on an optical fiber, obtain received spectrum of the one or more shaped ASE signals from the optical receiver connected to the optical fiber, and characterize the optical fiber based in part on a nonlinear skirt and/or center dip depth in the received spectrum of the one or more shaped ASE signals. The one or more shaped ASE signals can be formed by the ASE source communicatively coupled to a Wavelength Selective Switch (WSS) that is configured to shape ASE from the ASE source to form the one or more shaped ASE signals with one or two or multiple peaks and with associated frequency.

The invention discloses a digital optical fiber repeater with a backup and a switching method. The repeater mainly comprises a local machine and at least one remote machine, the plurality of main optical modules of the local machine are connected with the main optical modules of the corresponding remote machines, and the multiple optical modules of the local machine are connected with the standbyoptical modules of the corresponding remote machines, and each remote machine is connected in sequence. The local machine is mainly composed of a local main control board, a local intermediate-frequency board, and a local power supply module, and the remote machine is composed of a remote main control board, a remote intermediate-frequency board, a remote power supply module, and a power amplifiermodule. According to the digital fiber repeater system with backup and switching method, the local intermediate-frequency board, the remote intermediate-frequency board and the power amplifier moduleare stripped from the main control board by adopting a modular design, various modules are added or removed according to the use requirement; The instantaneous switching is realized through the hardware and the software in the system, and the user experience is basically not affected; meanwhile, the equipment cost is reduced, the design scheme is simplified, and the system reliability is improved.

The invention provides a method for improving a specific value of signal power and noise power in an amplifier, comprising: a signal power light and an ASE noise power light switching an input light channel to a bandpass filter in which the signal wavelength is located by an input light channel switching device; the bandpass filter filtering noise power beyond a band-pass range; and switching residual signal light into a main light path by an input light channel switching device. The method leads a narrow-band or single-channel signal to be capable of being switched to the corresponding bandpass filter when the signal wavelength is changed, thereby filtering the light accumulation of the noise power beyond a wave band and improving the specific value of the signal power light and the noise power light. The method can effectively improve the specific value of the signal power light and the noise power light, and has low cost, less occupation space and flexible design.

A method of multiplexing optical signals in a node of an optical network including as inputs a plurality of electrical signals, a plurality of laser transmitters, and as outputs a plurality of optical fibers, (a) generating clock pulses as a first clock frequency; (b) dividing the clock pulses respectively into a number of parallel trigger outputs; (c) sampling the electrical signals respectively by triggering on the parallel trigger outputs; (d) converting the sampled electrical signals to sampled optical signals by modulating respectively the laser transmitters with the sampled electrical signals and outputting respectively the sampled optical signals on the optical fibers; (e) combining the sampled optical signals onto a single optical fiber.

Disclosed in the invention are an FSK signal producing apparatus, a method and an application. The apparatus includes a first MZ modulator, a second MZ modulator and a combination unit. By inputting a first control voltage to a control electrode of the first MZ modulator, an output end of the first MZ modulator is enabled to output an inverting modulated optical signal. By inputting a second control voltage to a control electrode of the second MZ modulator, an output end of the second MZ modulator is enabled to output a non-inverting modulated optical signal. Combination of the non-inverting modulated optical signal and the inverting modulated optical signal is realized by the combination unit, thus the output of an FSK signal is realized. The apparatus utilizes a small number of optical devices, has a compact structure and greatly simplifies the structure of an FSK modulator. In addition, the FSK signal producing apparatus is directly driven by data signals which do not include sinusoidal signals, which can avoid performance and speed limitations for transmission of the FSK signal caused by the frequency of the sinusoidal signals. The produced FSK signal has a good shape of eye pattern in the high speed optical transmission system, and can realize error-free transmission in theory with a low loss and an excellent performance.

The invention relates to an optical fiber transient interruption feature information extracting system based on self-adaptive updating of a reference value. The system comprises a sliding average value calculation module, a reference value self-adaptive updating module, a reference value threshold calculation module and a transient interruption judgment module, wherein the sliding average value calculation module is used for performing updating storage on received luminous power sampling values and calculating a sliding average luminous power sampling value; the reference value self-adaptive updating module is used for obtaining a judgment reference value of optical fiber transient interruption according to the sliding average luminous power sampling value and performing self-adaptive updating; the reference value threshold calculation module is used for determining a judgment threshold of optical fiber transient interruption according to the judgment reference value of optical fiber transient interruption and a user-defined threshold range; the transient interruption judgment module is used for comparing the sliding average luminous power sampling value with the judgment threshold of optical fiber transient interruption, judging whether the optical fiber has transient interruption and outputting feature information of optical fiber transient interruption according to a judgment result. Compared with the prior art, the system has the advantages of self-adapting to updating of judgment reference, rapidly extracting transient interruption feature information, being suitable for various recovery conditions, meeting a design requirement from a low speed to a high speed and the like.

An instantaneous frequency measurement system based on a differential optical time stretching principle relates to the field of microwave photonics, ultrafast measurement and real-time measurement, and is characterized in that a light output end of a pulse laser light source is connected with one end of a dispersion module I, the other end of the dispersion module I is connected with an input end of a polarization controller, and an output end of the polarization controller is connected with a light input end of a modulator; one output port of the modulator is connected with the input end of the optical circulator I; the other output port of the modulator is connected with the input end of the optical circulator I, the other output port of the modulator is connected with the input end of the optical circulator II, the port of the optical circulator I and the port of the optical circulator II are respectively connected with one end of the dispersion module II, and the port of the optical circulator I and the port of the optical circulator II are respectively connected with the first optical input port and the second optical input port of the balance detector. The system can relieve the pressure of rear-end electronic equipment, eliminates the distortion influence of uneven laser pulse envelope on measurement through differential detection, and can perform real-time and accurate ultrafast measurement on multi-frequency signals.

The invention discloses a redundant backup system of a high-speed transceiver. The redundant backup system comprises a user data sending module, a multipath redundant backup module and a data selection module; the user data sending module is used for collecting user data and sending the collected user data to the redundant backup module; the redundant backup module is used for carrying out data encapsulation, high-speed data receiving and sending, data de-encapsulation and data validity judgment on the received user data; and the data selection module is used for selecting one path of data subjected to data validity judgment from the data output by the multi-path redundancy backup module for receiving. The hardware cost of redundant backup of the optical communication equipment is reduced, and the reliability and stability of the communication equipment are improved.

A piece of crystal is positioned between 2n input optical paths and 2n output optical paths. Each input optical path possesses input optical fiber, collimator and polarizer. Each output optical path possesses focusing lens and output optical fiber. N pairs of electrode are setup on surface of first electrode and surface of second electrode. Electrodes in each pair are paralleled each other. The light beam inputting surface of the 2n input optical paths paralleled each other is perpendicular to the crystal; or light beam inputting surface 401 of 2n input optical paths not paralleled each other is not perpendicular to the crystal. N pieces of 2X2 optical switches are integrated in single piece of crystal in the invention so as to realize integrated switch array between 2n input paths and 2n output paths. The advantages of the invention are: simple and reliable, high capability of anti-interference, small insertion loss, high S/N ratio and fast switch speed.