Patents by Inventor Alexandre Shen

Alexandre Shen has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 10594407
    Abstract: A system for optical linear sampling and coherent detection of an optical signal OS comprises a source emitting a pulsed optical signal SP and an optical coupler that splits the pulsed optical signal SP into two replicas, the first replica of the pulsed optical signal SP is sent to a first optical hybrid circuit and the second replica of the pulsed optical signal SP is send to a second optical hybrid circuit, a source emitting an optical signal OS and optical coupler that splits the incoming optical signal OS into two replicas, the first replica of the incoming optical signal OS is sent to the first optical hybrid circuit and the second replica of the incoming optical signal OS is sent to a wavelength recovery device WVLR, whose output is a continuous-waveform optical signal CW at the central wavelength of the incoming optical signal OS, which sends it to the second optical hybrid circuit.
    Type: Grant
    Filed: January 27, 2017
    Date of Patent: March 17, 2020
    Assignee: Alcatel Lucent
    Inventors: Alexandre Shen, Jean-Guy Provost
  • Publication number: 20190036612
    Abstract: A system for optical linear sampling and coherent detection of an optical signal OS comprises a source emitting a pulsed optical signal SP and an optical coupler that splits the pulsed optical signal SP into two replicas, the first replica of the pulsed optical signal SP is sent to a first optical hybrid circuit and the second replica of the pulsed optical signal SP is send to a second optical hybrid circuit, a source emitting an optical signal OS and optical coupler that splits the incoming optical signal OS into two replicas, the first replica of the incoming optical signal OS is sent to the first optical hybrid circuit and the second replica of the incoming optical signal OS is sent to to a wavelength recovery device WVLR, whose output is a continuous-waveform optical signal CW at the central wavelength of the incoming optical signal OS, which sends it to the second optical hybrid circuit.
    Type: Application
    Filed: January 27, 2017
    Publication date: January 31, 2019
    Inventors: Alexandre SHEN, Jean-Guy PROVOST
  • Publication number: 20150249505
    Abstract: A system for visualizing an optical signal OS through linear optical sampling, comprising at least one first subsystem relating to the processing of a pulse signal SP and at least one second subsystem related to the processing of an optical signal OS. The signals are broken down into two orthogonal polarization components, called vertical and horizontal. The pulse signal SP is broken down into vertical Vsp and horizontal Hsp components, and the magnetic TM and electric TE transverse propagation modes of the optical signal OS respectively give the vertical Vtm and Vte components and horizontal Htm and Hte components. The vertical and horizontal components are time-shifted. The vertical components and horizontal components of the pulse signal SP and optical signal OS are parallel. The successive, synchronized detection of vertical components and horizontal components makes it possible to sample the signal OS, which is visualized by electronic processing.
    Type: Application
    Filed: September 12, 2013
    Publication date: September 3, 2015
    Inventors: Jean-Guy Provost, Alexandre Shen
  • Patent number: 8462822
    Abstract: An photonic device, comprising one section of a material which is different from the material of another section such that the two sections present different optical birefringent index values. This causes a first set of polarization modes to move in a spectral space with a different velocity than a second set of polarization modes. A bias current, or voltage, is used for controlling the overall birefringence effect in the device. The biasing for controlling the birefringence effect is performed such the TE modes and the TM modes of the device are made to coincide in their respective spectral position. Thus the device is made insensitive, or presents substantially reduced sensitivity, to the polarization of any incoming optical signal.
    Type: Grant
    Filed: November 1, 2011
    Date of Patent: June 11, 2013
    Assignee: Alcatel Lucent
    Inventors: Alexandre Shen, Guang-Hua Duan
  • Publication number: 20130089333
    Abstract: A photonic integrated circuit transmitter and a method for transmitting optical signals including a mode-locked laser diode generating a frequency comb optical signal and inputting said comb optical signal into a multiplexer/demultiplexer which demultiplexes said comb optical signal into a plurality of individual optical signals. A plurality of reflective modulators each receiving a respective one of said demultiplexed individual optical signals and modulating said received individual optical signal and reflecting the modulated optical signal back to the multiplexer/demultiplexer. The multiplexer/demultiplexer then multiplexes the received modulated optical signal into a multiplexed output optical signal.
    Type: Application
    Filed: March 14, 2011
    Publication date: April 11, 2013
    Applicant: ALCATEL LUCENT
    Inventor: Alexandre Shen
  • Patent number: 8130801
    Abstract: An photonic device, comprising one section of a material which is different from the material of another section such that the two sections present different optical birefringent index values. This causes a first set of polarization modes to move in a spectral space with a different velocity than a second set of polarization modes. A bias current, or voltage, is used for controlling the overall birefringence effect in the device. The biasing for controlling the birefringence effect is performed such the TE modes and the TM modes of the device are made to coincide in their respective spectral position. Thus the device is made insensitive, or presents substantially reduced sensitivity, to the polarization of any incoming optical signal.
    Type: Grant
    Filed: July 14, 2009
    Date of Patent: March 6, 2012
    Assignee: Alcatel Lucent
    Inventors: Alexandre Shen, Guang-Hua Duan
  • Publication number: 20120044961
    Abstract: An photonic device, comprising one section of a material which is different from the material of another section such that the two sections present different optical birefringent index values. This causes a first set of polarization modes to move in a spectral space with a different velocity than a second set of polarization modes. A bias current, or voltage, is used for controlling the overall birefringence effect in the device. The biasing for controlling the birefringence effect is performed such the TE modes and the TM modes of the device are made to coincide in their respective spectral position. Thus the device is made insensitive, or presents substantially reduced sensitivity, to the polarization of any incoming optical signal.
    Type: Application
    Filed: November 1, 2011
    Publication date: February 23, 2012
    Inventors: Alexandre Shen, Guang-Hua Duan
  • Publication number: 20100014871
    Abstract: An photonic device, comprising one section of a material which is different from the material of another section such that the two sections present different optical birefringent index values. This causes a first set of polarization modes to move in a spectral space with a different velocity than a second set of polarization modes. A bias current, or voltage, is used for controlling the overall birefringence effect in the device. The biasing for controlling the birefringence effect is performed such the TE modes and the TM modes of the device are made to coincide in their respective spectral position. Thus the device is made insensitive, or presents substantially reduced sensitivity, to the polarization of any incoming optical signal.
    Type: Application
    Filed: July 14, 2009
    Publication date: January 21, 2010
    Inventors: Alexandre Shen, Guang-Hua Duan
  • Patent number: 7375879
    Abstract: The field of the invention is that of devices for regenerating optical signals. It applies more particularly to systems for high-throughput long distance transmission by optical fibres of digital data. While propagating, optical signals necessarily experience attenuation and degradation of their signal/noise ratio. To compensate for these degradations, wholly-optical regeneration devices are generally used. The object of the invention is to ensure regeneration which in large part eliminates noise, without using auxiliary optical devices. This regeneration is ensured by a structure with saturable optical absorbent comprising an optical cavity of thickness L comprising at least one layer of active material of Henry factor ?H and of maximum absorption variation ?? such that the thickness L equals about 2?/(?H, ??).
    Type: Grant
    Filed: July 10, 2006
    Date of Patent: May 20, 2008
    Assignee: Alcatel
    Inventor: Alexandre Shen
  • Publication number: 20080100908
    Abstract: The field of the invention is that of devices for regenerating optical signals. It applies more particularly to systems for high-throughput long distance transmission by optical fibers of digital data. While propagating, optical signals necessarily experience attenuation and degradation of their signal/noise ratio. To compensate for these degradations, wholly-optical regeneration devices are generally used. The object of the invention is to ensure regeneration which in large part eliminates noise, without using auxiliary optical devices. This regeneration is ensured by a structure with saturable optical absorbent comprising an optical cavity of thickness L comprising at least one layer of active material of Henry factor ?H and of maximum absorption variation ?? such that the thickness L equals about 2?/(?H ??).
    Type: Application
    Filed: July 10, 2006
    Publication date: May 1, 2008
    Inventor: Alexandre Shen
  • Patent number: 7158725
    Abstract: The invention relates to a saturable light absorber adapted to receive different focused spectral components, wherein the structure of said saturable light absorber comprises microcavities integrated into a substrate and each associated with a respective one of said spectral components, each microcavity comprising a saturable absorber layer delimited by a top reflector and a bottom reflector and being disposed and having dimensions such that it receives only the focused spectral component associated with it.
    Type: Grant
    Filed: July 31, 2002
    Date of Patent: January 2, 2007
    Assignee: Avanex Corporation
    Inventors: Alexandre Shen, Denis Leclerc
  • Patent number: 6954594
    Abstract: For regenerating a binary optical signal (sd, sE2) a monolithic semiconductor component (100) comprises: a saturable absorber structure (3) having a saturable absorber section (31), a first optical waveguide (1, 11 to 16) defining a first guide axis (X) disposed on either side of the section (31), a second optical waveguide (2, 21 to 24) defining a second guide axis (Y) crossing the first axis (X) in the section (31) and disposed on either side of the section (31). The saturable absorber structure has a dimension along the first guide axis greater than its dimension along the second guide axis. The first and second waveguides respectively inject an optical clock signal (c1) and the binary optical signal (sd, sE2). Application to optical transmission systems for regenerating signals in accordance with two different regeneration regimes.
    Type: Grant
    Filed: May 28, 2003
    Date of Patent: October 11, 2005
    Assignee: Avanex Corporation
    Inventors: Alexandre Shen, Nabil Sahri, Jean-Yves Emery
  • Patent number: 6807357
    Abstract: A saturable optical absorber component is made of an inhomogeneous absorption material including a plurality of sets of quantum boxes formed in stacked layers. The sizes of the quantum boxes of each set define an absorption wavelength associated with the set.
    Type: Grant
    Filed: January 31, 2002
    Date of Patent: October 19, 2004
    Assignee: Avanex Corporation
    Inventor: Alexandre Shen
  • Publication number: 20040062470
    Abstract: Optical device (1) for the differentiation of a first optical signal and an optical signal lagging behind the first, in which the differentiation is represented by a signal carried by a continuous wave passing through the two arms (5, 6) of an interferometer comprising media with an index that depends on the optical power passing through them. The delayed signal is the first signal fed back to one of the arms through a delay (7).
    Type: Application
    Filed: September 25, 2003
    Publication date: April 1, 2004
    Inventors: Alexandre Shen, Jean-Guy Provost, Fabrice Devaux, Bernd Sartorius, Tolga Tekin, Michael Schlak, Christopher Janz
  • Patent number: 6674569
    Abstract: Known optical power equalizers receive an optical main input signal modulating between high and low input power levels. The optical power equalizers emit an equalized optical main output signal modulating between high and low output power levels, where at least one of the two sets of high and low power levels is equalized to one high or one low output power level. Such devices can comprise at least one gain-clamped semiconductor optical amplifier that operates about its saturation range. The optical power equalizer receives an amplifier input signal, which has one or more modulated portions, and emits a modulated amplifier output signal. According to the invention the dependence of the gain-clamped semiconductor optical amplifier's gain on the power of the amplifier input signal is adjusted such that the high input power levels of the amplifier input signal are equalized into the one high output power level of the amplifier output signal.
    Type: Grant
    Filed: November 19, 2001
    Date of Patent: January 6, 2004
    Assignee: Alcatel
    Inventors: Patrick Brindel, St├ęphanie Barre, Denis Penninckx, Alexandre Shen
  • Publication number: 20030228155
    Abstract: For regenerating a binary optical signal (sd, sE2) a monolithic semiconductor component (100) comprises:
    Type: Application
    Filed: May 28, 2003
    Publication date: December 11, 2003
    Applicant: ALCATEL
    Inventors: Alexandre Shen, Nabil Sahrl, Jean-Yves Emery
  • Patent number: 6643040
    Abstract: The present invention is a device for converting an RZ signal into a NRZ signal which contains an optical bistable device (5), where an output level of this device passing from a low level to a high level when an input power level crosses in an upward direction a first threshold, and returning to a low level when an input level crosses in a downward direction a second threshold below the first, the output (7) of the bistable (5) carrying the NRZ signal, and a device (2) for converting the RZ signal into a control signal of an output logic level of the optical bistable device (5) receiving the RZ signal, and delivering the control signal of the optical bistable device (5), this signal having a level above the first threshold when the RZ signal passes to 1 and which becomes lower at the second threshold only if the RZ signal passes to 0 and stays there for more than one bit time.
    Type: Grant
    Filed: September 25, 2001
    Date of Patent: November 4, 2003
    Assignee: Alcatel
    Inventors: Alexandre Shen, Fabrice Devaux
  • Patent number: 6628855
    Abstract: An optical device for the differentiation of a first optical signal and an optical signal lagging behind the first, in which the differentiation is represented by a signal carried by a continuous wave passing through the two arms of an interferometer including media with an index that depends on the optical power passing through them. The delayed signal is the first signal fed back to one of the arms through a delay.
    Type: Grant
    Filed: March 28, 2001
    Date of Patent: September 30, 2003
    Assignee: Alcatel
    Inventors: Alexandre Shen, Jean-Guy Provost, Fabrice Devaux, Bernd Sartorius, Tolga Tekin, Michael Schlak, Cristopher Janz
  • Patent number: 6625338
    Abstract: Converter of an NRZ signal with a bit duration T comprising an interferometric structure (10) with two arms (9, 11) equipped with a medium (13, 15) with an index that varies depending on the optical power passing through the said medium. The NRZ signal to be converted is input into each of the arms (9, 11). The output signal (7) from the structure is reinput through a means (16) introducing a delay of T/2 in one of the arms (11). The signal at the output (7) is then the NRZ signal converted to the RZ format.
    Type: Grant
    Filed: May 10, 2001
    Date of Patent: September 23, 2003
    Assignee: Alcatel
    Inventors: Alexandre Shen, Fabrice Devaux, Michael Schlak, Tolga Tekin
  • Patent number: 6609839
    Abstract: In a device for regenerating a wavelength-division multiplex optical signal, the optical signal to be regenerated comes from an optical fiber and is injected back into the same optical fiber or into another fiber. The device comprises at least one dispersive medium for receiving the wavelength-division multiplex signal and emitting a corresponding dispersed wave into a free space and a saturable absorber which receives the dispersed wave and transmits a corresponding regenerated wave.
    Type: Grant
    Filed: October 4, 1999
    Date of Patent: August 26, 2003
    Assignee: Alcatel
    Inventors: Fabrice Devaux, Alexandre Shen, Philippe Pagnod-Rossiaux, Paul Salet, Christophe Starck