16 results about "Polarization mode dispersion" patented technology

The invention discloses a compensation method and device with robustness under a polarization effect, equipment and a storage medium, belongs to the technical field of communication, and solves the problem that the robustness of a communication system is affected under the existing factors such as rapid polarization state disturbance. A compensation method with robustness under a polarization effect comprises the following steps that S1, a transmitting end processing module generates a polarization multiplexing signal, and a pair of pilot frequencies is inserted in each of two polarization directions of the polarization multiplexing signal to obtain a transmitting end signal; s2, sending the sending end signal to a receiving end digital processing module through a link with a polarization effect, extracting a damage matrix at an insertion position by the receiving end digital processing module according to the pilot frequency, and calculating differential group delay and polarization loss according to a channel matrix, and constructing a damage compensation matrix and completing compensation of the link with the polarization effect. The method provided by the invention has high robustness under the condition that polarization rotation and polarization mode dispersion are damaged in a polarization state.

A system and method for implementing a Variable Optical Attenuator (VOA) for high optical power handling. The VOA device may include an optical signal attenuation element with a fixed optical path to dump unwanted optical light to a light absorption material. The light absorption material may be thermally managed for reliability. The VOA device may support input light beams having any polarization state or composites of both P and S light. An embodiment of the present invention is directed to managing P light and S light through the VOA device to travel within a same optical path length to minimize Polarization Mode Dispersion (PMD). In addition, P and S polarization beams may be independently attenuated to minimizes Polarization Dependent Loss (PDL).

This invention provides a low-crosstalk signal demodulation device and method for fiber optic laser communication, belonging to the field of fiber optic communication technology. The device includes a fiber optic signal input port, an optical circulator, a polarization beam splitter / combiner module, a balanced photodetector unit, a low-noise amplification and quadrature demodulation module, an adaptive crosstalk cancellation unit, a MIMO equalization and decision unit, and a digital signal output port, connected in series according to the signal flow direction. It also includes a crosstalk monitoring and feedback unit bidirectionally connected to the low-noise amplification and quadrature demodulation module, the adaptive crosstalk cancellation unit, and the MIMO equalization and decision unit. This invention, employing the aforementioned low-crosstalk signal demodulation device and method for fiber optic laser communication, overcomes the limitations of traditional single-domain crosstalk suppression. Through the synergistic effect of optical path, circuit, and algorithm layers, it effectively suppresses crosstalk caused by multi-channel multiplexing, polarization mode dispersion, and backscattering, significantly improving demodulation accuracy, anti-interference capability, and system stability.

A control device controls operation of a compensation device that compensates for birefringence and / or polarization mode dispersion experienced by signal light propagating in an optical transmission path by digital signal processing using a finite impulse response filter, the control device having: a detection signal receiving section that receives a detection signal that is a signal representing a detection result of a detection device that optically detects a polarization fluctuation in the optical transmission path; and a setting section that decides a setting related to an update frequency or update interval of a tap number of the finite impulse response filter or a setting related to an update frequency or update interval of a tap coefficient of the finite impulse response filter based on the detection result of the detection device.

A method and system of measuring the PMD of an optical fiber under test (FUT). A polarization-sensitive optical time domain reflectometer (POTDR) is used to inject into the FUT and from a proximal end thereof, a test signal comprising a series of repeated light pulses and detecting a corresponding polarization-analyzed return light signal coming back from the optical fiber and representing back-reflected light from a light reflector connected to a distal end of the FUT. The plurality of polarization-sensitive acquisitions defines at least one pair of acquisitions performed with mutually different but closely-spaced wavelengths and substantially the same state of polarization (SOP). The process may be repeated for a plurality of pairs of acquisitions performed with at least one of a plurality of mutually-different center wavelengths and a plurality of mutually-different SOPs, and a value of the PMD for the FUT is calculated therefrom.

A silicon-photonics co-packaged optical connector (CPO) is disclosed. The connector provides combined multiple shell lens facet with total internal multi-light-path tunneling. Total optical reflection at the multiple lenses ensures minimal loss, preserved polarization mode dispersion (PMD) and controlled numerical aperture (NA). The shell lens design is inspired by the chirality of seashell symmetry when placed in reference to a symmetry axis and the ensuing special flexibility. An exemplary manufacturing process of the CPO with shell lens is also disclosed.

A silicon-photonics co-packaged optical connector (CPO) is disclosed. The connector provides combined multiple shell lens facet with total internal multi-light-path tunneling. Total optical reflection at the multiple lenses ensures minimal loss, preserved polarization mode dispersion (PMD) and controlled numerical aperture (NA). The shell lens design is inspired by the chirality of seashell symmetry when placed in reference to a symmetry axis and the ensuing special flexibility. An exemplary manufacturing process of the CPO with shell lens is also disclosed.

The invention belongs to the technical field of communication, and particularly relates to a polarization mode dispersion compensation method and system with low complexity and rapid convergence, and the method comprises the steps: obtaining the normalized amplitude weight of a signal through normalization processing according to the characteristic of a signal constellation point module value; a signal passes through a butterfly filter, and depolarization division multiplexing and polarization mode dispersion compensation are carried out; calculating a difference value between a symbol after equalization and a signal constant modulus constant so as to determine an equalizer vector updating direction and scale; according to the method, the normalized amplitude weight of the signal constellation point is calculated, the butterfly filter is used for filtering the signal, then the filter tap matrix is guided to be updated and iterated according to the normalized amplitude weight, and finally the polarization mode dispersion compensation and depolarization multiplexing are realized. Therefore, convergence of the tap matrix is accelerated, a reliable and stable communication system can be provided, and the method has great potential and application prospects in the communication field.

The present invention discloses an apparatus for use by a coherent receiver, comprising means for: obtaining a first set of coefficients (A+) indicating a first adaptive filter (A) configured to reduce at least part of polarization mode dispersion in an equalizer of the coherent receiver and a second set of coefficients (w+) indicating a second adaptive filter (w) configured to reduce at least part of the inter-symbol interference in the equalizer of the coherent receiver, determining a first updated set of coefficients (A++) and a second updated set of coefficients (w++) based on the first set of coefficients (A+) and the second set of coefficients (w+), wherein the gains of the first updated set of coefficients (A++) have a predetermined level, and wherein, the output of the equalizer based on the first set of coefficients (A+) and the second set of coefficients (w+) is approximately same as the output of the equalizer based on the first updated set of coefficients (A++) and the second updated set of coefficients (w++), providing the first updated set of coefficients (A++) and the second updated set of coefficients (w++) to the first filter and the second filter respectively.

The present application relates to a reticle cartridge having a retention through a reticle compartment wall. The reticle cartridge includes an outer portion including a cartridge door and a cartridge dome, and an inner portion including a bottom plate and a cover. One of the base plate or the cover includes a reticle compartment wall extending toward the other of the base plate or the cover. The reticle compartment wall includes one or more retention features. The cartridge door or the cartridge dome includes one or more actuation surfaces configured to contact the retention feature. The retention feature is configured to be moved by contact with the actuation surface. The retaining feature may be in a position, the positions are configured to secure a reticle within the inner portion of the reticle cartridge when the reticle cartridge is assembled by engaging the base plate with the cover, placing the engaged base plate and the engaged cover within the cartridge dome, and securing the cartridge door to the cartridge dome.

The application discloses a polarization mode dispersion-tolerant dispersion monitoring method and system and electronic equipment, and the method comprises the following steps: firstly, calculating the spectrum autocorrelation function of the X polarization of an input optical signal; determining the first time-domain pulse sequence of the spectrum autocorrelation function on the X polarization according to the spectrum autocorrelation function of the X polarization; calculating the spectrum cross-correlation function between the X polarization and the Y polarization of the input optical signal; determining the second time-domain pulse sequence on the spectrum cross-correlation function according to the spectrum cross-correlation function; determining the pulse peak position according to the first time-domain pulse sequence and the second time-domain pulse sequence; and determining the dispersion value of the target optical signal according to the pulse peak position. The application can tolerate polarization mode dispersion and polarization state rotation, and can be widely applied to the technical field of coherent optical communication.

The application provides a manufacturing method and a manufacturing device of a low polarization mode dispersion hollow core optical fiber, and the manufacturing method comprises the following steps: transmitting the hollow core optical fiber after being processed and shaped by a drawing furnace to a twisting mechanism, and the hollow core optical fiber is forced to rotate along the axis direction of the hollow core optical fiber when the hollow core optical fiber is vertically moved, so that the low polarization mode dispersion hollow core optical fiber is obtained; and the number of rotation turns of the hollow core optical fiber when the hollow core optical fiber is vertically moved is periodically and asymmetrically changed. The application reduces the polarization mode dispersion of the hollow core optical fiber by applying the twisting mechanism to the manufacturing of the hollow core optical fiber.

The application discloses an optical signal wavelength optimization method and device, a storage medium and a processor. In the scheme, the wavelength distortion features in the original optical signal data are extracted; the target distortion distribution data constructed according to the distortion categories of the wavelength distortion features is deeply analyzed to obtain nonlinear crosstalk characteristic parameters and polarization mode dispersion characteristic parameters, and mapping relationship data is determined according to the parameters and parameters of the optical communication system; wavelength correction coefficients corresponding to the optical signal are generated based on the mapping relationship data, the initial wavelength parameters are adjusted to obtain target wavelength parameters according to the wavelength correction coefficients and the dispersion characteristics of the optical fiber material; the distortion change degree of the optical signal in the transmission environment of the optical communication system is simulated based on the target wavelength parameters; and the target wavelength parameters are adjusted according to the distortion change degree. The application solves the problem that the existing technology cannot effectively suppress wavelength distortion due to the difficulty in adapting to the dynamically changing transmission environment, and guarantees the signal transmission quality of the optical communication system.

The utility model discloses a polarization modulation system based on a Sagnac interferometer. The polarization modulation system comprises a light source, the Sagnac interferometer and a receiving end. The Sagnac interferometer comprises a beam splitter and a phase modulator; a first port of the beam splitter is connected with the output end of the light source, a second port of the beam splitter is connected with one end of the phase modulator through the polarization maintaining optical fiber, a third port of the beam splitter is connected with the other end of the phase modulator through the polarization maintaining optical fiber, and a fourth port of the beam splitter is connected with the input end of the receiving end. The utility model discloses a polarization modulation system based on a Sagnac interferometer, which can well offset phase noise introduced by a transmission medium through the structure of the Sagnac interferometer, and does not need additional phase compensation. And the clockwise and anticlockwise optical pulses in the Saganc interferometer are transmitted through the slow axis of the polarization maintaining optical fiber, so that the influence of polarization mode dispersion and the influence of the action difference of the phase modulator on the optical pulses in different polarization states are avoided, and the stability of polarization modulation is improved.

The invention discloses a dynamic polarization lock based on a multi-step simulated annealing algorithm, and belongs to the technical field of quantum communication and optical fiber communication. Aiming at the problem of polarization state drift caused by the influence of an external complex environment, the birefringence effect of an optical fiber, polarization mode dispersion and polarization dependent loss, energy of single pulse light is converted into peak voltage of output electric pulse in real time by utilizing an integral type optical signal detector based on a charge amplifier; and real-time measurement of the energy of a single optical pulse signal is realized. And a multi-step simulated annealing algorithm is rapidly operated by using the FPGA to search a target polarization state, so that high-speed polarization locking under the condition of pulsed light is realized. An extrusion type electric control polarization controller is utilized, piezoelectric ceramics are driven by applied voltage to extrude an optical fiber to change corresponding delay amount, and polarization state output of any target is controlled. The polarization state drift caused by the influence of an external complex environment, the birefringence effect of the optical fiber, polarization mode dispersion and polarization-dependent loss is effectively solved.