Abstract: A chimeric lysozyme variant has an improved heat resistance and is encoded by a polynucleotide. A novel chimeric lysozyme sequence is constructed, and high-efficiency expression in a host cell is achieved. The thermal stability of the chimeric lysozyme under the condition of 60° C. is nearly doubled compared to a parental sequence. The chimeric lysozyme variant can be used to prepare product that is antibiotic, for example, animal feed additive containing the chimeric lysozyme variant and an animal feed containing the animal feed additive.

Abstract: A method for implementing a variable optical splitter and a variable optical splitter are provided. The method includes that: the variable optical splitter is divided into one or more virtual optical splitting units according to wavelengths/wavebands of optical signals, wherein the virtual optical splitting units and the wavelengths/wavebands are in a one-to-one correspondence, and moreover, the wavelengths/wavebands and splitting ratios are also in a one-to-one correspondence; and optical guiding or optical splitting is performed on the incident optical signals through the virtual optical splitting units. By adopting the technical solutions provided by the present disclosure, the technical problems that there is yet no optical splitter with a variable splitting ratio in the related technology and the like are solved, and controllability of the splitting ratios of the optical splitter is achieved.

Abstract: The disclosure relates to the technology of optical communication, and specifically, to a passive photoelectric tag. The passive photoelectric tag includes: an photocell used to receive an optical signal; a service separation unit used to separate the received optical signal into a DC voltage and an AC signal; a transceiver unit used to perform photoelectric conversion and electric signal processing on an optical signal in the AC signal under power supply of the DC voltage to generate a signal to be transmitted; and an LED emission unit used to transmit the signal to be transmitted in a form of an optical signal. The passive photoelectric tag realizes power provision and signal receiving through a photocell, and power supply is not needed, the cost and the size of the passive photoelectric tag is reduced and the service life of the passive photoelectric tag is prolonged.

Abstract: A method for implementing a variable optical splitter and a variable optical splitter are provided. the method includes that: the variable optical splitter is divided into one or more virtual optical splitting units according to wavelengths/wavebands of optical signals, wherein the virtual optical splitting units and the wavelengths/wavebands are in a one-to-one correspondence, and moreover, the wavelengths/wavebands and splitting ratios are also in a one-to-one correspondence; and optical guiding or optical splitting is performed on the incident optical signals through the virtual optical splitting units. By adopting the technical solutions provided by the present disclosure, the technical problems that there is yet no optical splitter with a variable splitting ratio in the related technology and the like are solved, and controllability of the splitting ratios of the optical splitter is achieved.

Abstract: Disclosed are a passive optical tag, an optical read/write device and an intelligent optical distribution network. The passive optical tag includes: an optical receiver, an optical transmitter, a chip and a photocell, where the optical receiver is connected with the chip and is configured to receive an optical signal, convert the optical signal into an electrical signal and send the electrical signal to the chip; the chip is configured to process the electrical signal and store tag information; the optical transmitter is connected with the chip and is configured to modulate the electrical signal sent by the chip into an optical signal and transmit the optical signal obtained by modulation; and the photocell is configured to convert optical energy into electrical energy and store the electrical energy, and provide electrical energy to the optical receiver, the optical transmitter and the chip.

Abstract: The disclosure provides a method and a system for detecting a fiber fault in a Passive Optical Network (PON). The system comprises an optical path detection device, a Wavelength Division Multiplexing (WDM) coupler, a wavelength selection coupler, a branch fiber selector and a wavelength selection router. The detection system is attached to an original PON system, without influencing the operation of the original system while performing the detection. With the disclosure, the problem of being unable to determine whether there is a fault in a branch fiber due to the loss of an optical path detection reflection signal is solved, the branch fiber with a fault can be quickly located and fixed, thus the operational and maintenance costs of an operator are reduced.

Abstract: The disclosure provides a long-distance box and a method for processing uplink light and downlink light of the long-distance box, uplink light and downlink light from different Passive Optical Network (PON) systems are split, the uplink light from the different PON systems is transmitted through a first optical path, and the downlink light from the different PON systems is transmitted through a second optical path; wherein the uplink light from the different PON systems is amplified by an Optical Amplifier (OA) and then output to Optical Line Terminals (OLT) of respective systems; the downlink light from different PON systems with the different wavelengths is transmitted through different optical sub-paths of the second optical path according to the wavelengths of the downlink light, and the downlink light is amplified by different Optical-Electrical-Optical (OEO) conversion devices on the different optical sub-paths and then output to Optical Network Units (ONUs) of the respective systems.

Abstract: The present invention provides a long reach optical amplification device, a passive optical network and an optical signal transmission method in the communication field.

Abstract: The disclosure provides a long-distance box and a method for processing uplink/downlink light thereof. The method includes that: the uplink/downlink light (uplink light and downlink light) from different PON systems is split, and the uplink/downlink light from different PON systems is transmitted through different optical paths; and the uplink/downlink light from different PON systems is processed by long-distance boxes belonging to corresponding systems in different optical paths, and then output to the OLTs/ONUs of respective systems. By means of the method provided in the disclosure, a simple and reliable solution is provided for operators to solve the long-distance problem caused by the coexistence of multiple PON systems; furthermore, in the disclosure, modification for the system is slightest, reliability of the system is highest, and an efficiency of the system is highest, so that time and cost are saved for the operators.

Abstract: The present invention discloses a Wavelength Division Multiplexing Filter which can satisfy coexistence requirements of different PON systems and an optical line detecting system.

Abstract: A method and a device for an optical power budget in a passive optical network are disclosed in the present invention, wherein said method includes: acquiring a corresponding minimum optical link loss according to a transmission requirement of a passive optical network with a large splitting ratio or long distance (710); selecting an optical transmitter with large power and an optical receiver with high sensitivity as a combination of an optical transmitter of an Optical Line Terminal (OLT) and an optical receiver of an Optical Network Unit (ONU) in an optical link, as well as a combination of an optical receiver of the OLT and an optical transmitter of the ONU in the optical link according to the minimum optical link loss to compose a passive optical network system comprising the OLT, an Optical Distribution Network (ODN), and ONUs connected in sequence (720).

Abstract: The disclosure provides a method and a system for detecting a fiber fault in a Passive Optical Network (PON). The system comprises an optical path detection device, a Wavelength Division Multiplexing (WDM) coupler, a wavelength selection coupler, a branch fiber selector and a wavelength selection router. The detection system is attached to an original PON system, without influencing the operation of the original system while performing the detection. With the disclosure, the problem of being unable to determine whether there is a fault in a branch fiber due to the loss of an optical path detection reflection signal is solved, the branch fiber with a fault can be quickly located and fixed, thus the operational and maintenance costs of an operator are reduced.

Abstract: The present invention provides a long reach optical amplification device, a passive optical network and an optical signal transmission method in the communication field.

Abstract: The disclosure provides a long-distance box and a method for processing uplink/downlink light thereof. The method includes that: the uplink/downlink light (uplink light and downlink light) from different PON systems is split, and the uplink/downlink light from different PON systems is transmitted through different optical paths; and the uplink/downlink light from different PON systems is processed by long-distance boxes belonging to corresponding systems in different optical paths, and then output to the OLTs/ONUs of respective systems. By means of the method provided in the disclosure, a simple and reliable solution is provided for operators to solve the long-distance problem caused by the coexistence of multiple PON systems; furthermore, in the disclosure, modification for the system is slightest, reliability of the system is highest, and an efficiency of the system is highest, so that time and cost are saved for the operators.

Abstract: The disclosure provides a long-distance box and a method for processing uplink light and downlink light of the long-distance box, uplink light and downlink light from different Passive Optical Network (PON) systems are split, the uplink light from the different PON systems is transmitted through a first optical path, and the downlink light from the different PON systems is transmitted through a second optical path; wherein the uplink light from the different PON systems is amplified by an Optical Amplifier (OA) and then output to Optical Line Terminals (OLT) of respective systems; the downlink light from different PON systems with the different wavelengths is transmitted through different optical sub-paths of the second optical path according to the wavelengths of the downlink light, and the downlink light is amplified by different Optical-Electrical-Optical (OEO) conversion devices on the different optical sub-paths and then output to Optical Network Units (ONUs) of the respective systems.

Abstract: The present invention discloses a Wavelength Division Multiplexing Filter which can satisfy coexistence requirements of different PON systems and an optical line detecting system.

Abstract: A method and a device for an optical power budget in a passive optical network are disclosed in the present invention, wherein said method includes: acquiring a corresponding minimum optical link loss according to a transmission requirement of a passive optical network with a large splitting ratio or long distance (710); selecting an optical transmitter with large power and an optical receiver with high sensitivity as a combination of an optical transmitter of an Optical Line Terminal (OLT) and an optical receiver of an Optical Network Unit (ONU) in an optical link, as well as a combination of an optical receiver of the OLT and an optical transmitter of the ONU in the optical link according to the minimum optical link loss to compose a passive optical network system comprising the OLT, an Optical Distribution Network (ODN), and ONUs connected in sequence (720).

Abstract: A method and apparatus for substantially preventing recirculation of heated air from an exhaust outlet of an expansion card to an air inlet of the expansion card, wherein the air inlet and exhaust outlet are both on the same end of the chassis. The apparatus comprises a chassis with a chassis fan, a motherboard within the chassis having an expansion card connector, and an expansion card in communication with the expansion card connector and secured to the front end of the chassis. The expansion card also includes a card fan configured to move cooling air through the air inlet to the exhaust outlet. An air duct redirects the hot air from the exhaust outlet to prevent recirculation into the expansion card and causes the heated air to exit through the chassis fan. The air duct may include a longitudinal segment through a computer module and a lateral segment selectively securable over the exhaust outlet.

Abstract: An electromagnetic shield comprising an electrically conductive frame for establishing electrical contact between a chassis wall and an expansion card mounting bracket. The frame has a plurality of spring fingers interconnected about a perimeter of a central opening in the frame, wherein each spring finger defines a central axis that extends outwardly away from the central opening. The frame may include a substantially planar portion adjacent the central opening in the frame, wherein the plurality of spring fingers incline along the central axis to extend out of the plane defined by the substantially planar portion. The incline of the spring fingers allows a mounting bracket to slide laterally without jamming against the side of a spring finger during installation, removal or side-to-side shifting of the mounting plate.

Abstract: Method and apparatus for substantially preventing recirculation of heated air from an exhaust outlet of an expansion card to an air inlet of the expansion card, wherein the air inlet and exhaust outlet are both on the same end of the chassis. The apparatus comprises a chassis with a chassis fan, a motherboard within the chassis having an expansion card connector, and an expansion card in communication with the expansion card connector and secured to the front end of the chassis. The expansion card also includes a card fan configured to move cooling air through the air inlet to the exhaust outlet. An air duct redirects the hot air from the exhaust outlet to prevent recirculation into the expansion card and causes the heated air to exit through the chassis fan. The air duct may include a longitudinal segment through a computer module and a lateral segment selectively securable over the exhaust outlet.