Patents Assigned to O-Net Communication (SZ) Ltd.
  • Patent number: 8649637
    Abstract: The present patent application relates to a polarization interference optical interleaver, which includes a first port to transmit the first optical signal through the first optical path, a second port to transmit the second optical signal and a third port to transmit the third optical signal. The first optical signal passes through the first optical path and splits into the second optical signal and the third optical signal by the first and the second light splitting/combining crystals and the interference crystal group. The interference crystal group is located between the first and the second light splitting/combining crystals. The second optical signal and the third optical signal are received and reflected by a reflecting mirror. Then the second optical signal and the third optical signal output through the second port and the third port respectively.
    Type: Grant
    Filed: April 26, 2011
    Date of Patent: February 11, 2014
    Assignee: O-Net Communications (Shenzhen) Limited
    Inventors: Weiwei Zhang, Jun Huang, Zeqin Wang, Hong Xie
  • Patent number: 8570654
    Abstract: A free-space optical hybrid is provided. The free-space optical hybrid includes a polarizing beam splitter that split the light beams S and L into horizontal polarization light beams Sx, Lx and orthogonal polarization light beams Sy, Ly, respectively, at least one birefringent crystal splits the horizontal polarization light beams Sx, Lx and orthogonal polarization light beams Sy, Ly into light beams Sxo, Sxe, Lxo, Lxe, Syo, Sye, Lyo, Lye, a light combiner that combine the light beams Sxo+Lxo, Sxo?Lxo, Sxe+jLxe, Sxe?jLxe, Syo+Lyo, Syo?Lyo, Sye+jLye, Sye?jLye and output the light beams at ports. The present invention can realize an optical hybrid in free-space by using a birefringent crystal and can split light beams of different polarization statuses in free-space well. The optical hybrid offers a compact structure and good stability.
    Type: Grant
    Filed: May 19, 2010
    Date of Patent: October 29, 2013
    Assignee: O-Net Communications (Shenzhen) Limited
    Inventors: Bin Chen, Xiaohui Ren, Linyong Chen, Hong Xie
  • Patent number: 8488233
    Abstract: The invention discloses an apparatus for enhancing the signal power to ASE power ratio in an optical amplifier including a 1×n input optical switching component, n band-pass filters, and an n×1 output optical switching component, wherein the signal power is allowed to pass through the band-pass filter switched by the 1×n input optical switching component and the n×1 output optical switching component.
    Type: Grant
    Filed: October 1, 2009
    Date of Patent: July 16, 2013
    Assignee: O-Net Communications (Shenzhen) Limited
    Inventors: Bichang Huang, Aihua Yu
  • Patent number: 8380067
    Abstract: A tunable chromatic dispersion compensation device used to compensate chromatic dispersion of wavelength of at least one predetermined wavelength band of light signal is provided. The tunable chromatic dispersion compensation device comprises a chromatic dispersion compensator, and a controller. The chromatic dispersion compensator comprises at least a first chromatic dispersion compensation unit and a second chromatic dispersion compensation unit connected with the first chromatic dispersion compensation unit in series. The first chromatic dispersion compensation unit has a free spectral range, the second chromatic dispersion compensation unit has a free spectral range same as to that of the first chromatic dispersion compensation unit. Each chromatic dispersion compensation unit comprises an interference cavity. The controller comprises an inputting unit being configured for inputting a predetermined chromatic dispersion compensation information.
    Type: Grant
    Filed: November 19, 2009
    Date of Patent: February 19, 2013
    Assignee: O-Net Communications (Shenzhen) Limited
    Inventors: Zeqin Wang, Guohui Zheng, Jun Huang, Xiaobing Qiu
  • Patent number: 8379221
    Abstract: The present patent application provides an interference cavity for precisely controlling an optical path including a cavity formed by two equal distance arms, wherein a positive adjusting plate and a negative adjusting plate are disposed in the interference cavity for compensating the change of a cavity length with temperature and thereby ensuring that the interference cavity length is a constant. The present patent application utilizes the matching relationship between the change of the refractive index of the positive adjustment plate with the temperature and the change of the refractive index of the negative adjusting plates with the temperature to make the optical path difference OPL invariant with changes in the environment temperature and thereby to ensure the precision of the optical path.
    Type: Grant
    Filed: March 2, 2010
    Date of Patent: February 19, 2013
    Assignee: O-Net Communications (Shenzhen) Limited
    Inventors: Zeqin Wang, Hong Xie
  • Patent number: 8238394
    Abstract: The present patent application provides a low power consumption pump driving circuit including a laser cooling chip, a PMOS transistor, a NMOS transistor, a LC filter circuit, a laser, and a voltage sampling circuit. The pulse width modulating signal generated by the laser cooling chip and the control terminal of the PMOS transistor are connected to the gate of the PMOS transistor. The source of the PMOS transistor is connected to a power supply. The drain of the PMOS transistor is connected to the LC filter circuit. The other terminal of the LC filter circuit is connected to the anode of the laser. The cathode of the laser is connected to the drain of the NMOS transistor. The source of the NMOS transistor is connected to the ground. One terminal of the voltage sampling circuit is connected to the laser. The other terminal of the voltage sampling circuit is connected to the laser cooling chip.
    Type: Grant
    Filed: March 1, 2010
    Date of Patent: August 7, 2012
    Assignee: O-Net Communications (Shenzhen) Limited
    Inventors: Jing Wei Wang, Ai Hua Yu
  • Patent number: 8139286
    Abstract: A Self-adapting feed forward control apparatus in an optical amplifier includes a feed forward controller for collecting target output power (Pout) and controlling drive current of a pump laser in the optical amplifier; a feedback controller for calculating target output power (Pt) and collecting actual output power (Pout), calculating deviation between (Pt) and (Pout), and controlling drive current of the pump laser; and a parameter estimator for collecting power target, output power and summation of output signal of the feed forward controller and feedback controller, and estimating the feed forward parameter and updating the parameter of the feed forward controller. The apparatus can automatically correct the feed forward control parameters according to the variation of EDFA parameters due to environmental condition changes or device aging.
    Type: Grant
    Filed: March 26, 2009
    Date of Patent: March 20, 2012
    Assignee: O-Net Communications Limited
    Inventors: Bichang Huang, Aihua Yu
  • Patent number: 8103138
    Abstract: A tunable filter is provided.
    Type: Grant
    Filed: January 15, 2010
    Date of Patent: January 24, 2012
    Assignee: O-Net Communications (Shenzhen) Limited
    Inventors: Yang Fang, Bin Chen, Chuan Zhang, Hong Xie
  • Patent number: 7940452
    Abstract: A method for acquiring spectrum shape of a gain flattening filter of a doped optical fiber amplifier comprises the steps of: measuring spectrum shapes at two gain point (H, L) of the doped optical fiber with invariable fiber length respectively; and acquiring various gain spectrums of the doped optical fiber with various fiber length and various population inversion level according to an expression: ErGain(?,x,L?)=[ErLGain(?)+[ErHGain(?)?ErLGain(?)]*x]*L?, Wherein Gain(?) refers to the spectral function of gain, x is ??inv/?inv which refers to change of population inversion level, and L? is set as proportion of doped fiber length. Gain spectrums of the doped optical fiber with various fiber length can be acquired by measuring spectrum shapes at two gain point (H, L) of the doped optical fiber in invariable fiber length and applying change rule of gain spectrum of the doped optical fiber in different population inversion level, which improves the flexibility for design of amplifier.
    Type: Grant
    Filed: August 21, 2008
    Date of Patent: May 10, 2011
    Assignee: O-Net Communications (Shenzhen) Limited
    Inventors: Zhigang Wang, Aihua Yu
  • Publication number: 20100091356
    Abstract: The invention discloses an apparatus for enhancing the signal power to ASE power ratio in an optical amplifier including a 1×n input optical switching component, n band-pass filters, and an n×1 output optical switching component, wherein the signal power is allowed to pass through the band-pass filter switched by the 1×n input optical switching component and the n×1 output optical switching component.
    Type: Application
    Filed: October 1, 2009
    Publication date: April 15, 2010
    Applicant: O-NET Communications (Shenzhen) Limited
    Inventors: Bichang Huang, Aihua Yu
  • Publication number: 20090303575
    Abstract: A Self-adapting feed forward control apparatus in an optical amplifier includes a feed forward controller for collecting target output power (Pout) and controlling drive current of a pump laser in the optical amplifier; a feedback controller for calculating target output power (Pt) and collecting actual output power (Pout), calculating deviation between (Pt) and (Pout), and controlling drive current of the pump laser; and a parameter estimator for collecting power target, output power and summation of output signal of the feed forward controller and feedback controller, and estimating the feed forward parameter and updating the parameter of the feed forward controller. The apparatus can automatically correct the feed forward control parameters according to the variation of EDFA parameters due to environmental condition changes or device aging.
    Type: Application
    Filed: March 26, 2009
    Publication date: December 10, 2009
    Applicant: O-NET Communications (Shenzhen) Limited
    Inventors: Bichang Huang, Aihua Yu
  • Patent number: 7522808
    Abstract: A variable optical attenuator with photoelectric detector, comprising a collimator, a variable optical attenuator chip, wherein the variable optical attenuator further comprises a photoelectric detector; and the photoelectric detector receives and detects partial light from the variable optical attenuator chip. The variable optical attenuator of the invention is capable of detecting attenuation change of itself via the variable optical attenuator chip. Thus, real-time monitoring and feedback are implemented, and the attenuation performance of the variable optical attenuator is improved.
    Type: Grant
    Filed: April 4, 2008
    Date of Patent: April 21, 2009
    Assignee: O-Net Communications (Shenzhen) Limited
    Inventors: Zeqin Wang, Hong Xie
  • Patent number: 7440652
    Abstract: A WDM coupler includes a first collimator including a single fiber pigtail, a first GRIN lens and a first glass holding tube; a second collimator including a dual fiber pigtail, a second GRIN lens and a second glass holding tube; an optical filter arranged on an end surface of the second GRIN lens of the second collimator; an outer glass sleeve bridging the first and second collimators; and UV-curing epoxy between the outer glass sleeve and the glass holding tubes of the first and second collimators for securing the first and second collimators to the outer glass sleeve. The expansion coefficient of the UV-curing epoxy is matched to that of the glass materials of the outer glass sleeve and the first and second holding tubes, so that the first and second collimators can directly be fixed in the outer glass sleeve using the UV-curing epoxy.
    Type: Grant
    Filed: June 8, 2004
    Date of Patent: October 21, 2008
    Assignee: O-Net Communication (SZ) Ltd.
    Inventors: Zeqin Wang, Bin Chen, Yi Li