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Patent Agency Ranking
公开(公告)号：JP2001305358A
公开(公告)日：2001-10-31
申请号：JP2001079694
申请日：2001-03-21
Applicant: LUCENT TECHNOLOGIES INC
Inventor： CHANDRASEKHAR SETHUMADHAVAN , SARATHY JITEN
Abstract: PROBLEM TO BE SOLVED: To provide a method and a device for realizing a polarized wavelength selective beam demultiplexer/multiplexer. SOLUTION: A wavelength grating router(WGR) having a double refraction grating waveguide is included in a wavelength selective polarizing beam device. When the device is used as a demultiplexer, a channel of wavelengths different in a WDM signal is separated and a polarizing component orthogonal with respect to each wavelength channel is also separated. Since the WGR device is provided with reciprocity, the WGR device is used as a multiplexer and orthogonal polarizing components of each wavelength channel are combined to form the WDM signal.
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公开(公告)号：AT316722T
公开(公告)日：2006-02-15
申请号：AT04250980
申请日：2004-02-24
Applicant: LUCENT TECHNOLOGIES INC
Inventor： CHANDRASEKHAR SETHUMADHAVAN , CHRAPLYVY ANDREW ROMAN , DOERR CHRISTOPHER RICHARD , WINZER PETER J
Abstract: An improved multi-channel optical equalizer method and apparatus for intersymbol interference mitigation compensates for single- or multi- wavelength channels simultaneously and requires few adjustable parameters. The optical equalizer can also compensate for overshoots and signal transition degradations of a semiconductor optical amplifier. The equalizer unit has only two control signals, one to control signal magnitude and one to control signal phase, yet it can still compensate many wavelength channels simultaneously. The equalizer includes a coupler with a controllable coupling ratio for splitting the light into two portions and a controllable interferometer means having two arms, one arm having an additional delay which is equal to an integer multiple of 1/ DELTA f, where DELTA f is the channel spacing between adjacent wavelengths utilized in the optical system. The controllable interferometer unit also has a controllable delay in a first or second arm for adjusting the relative phase of the light passing therethrough. A coupler combines the two signal portions from the first and second arms to form the equalized output signal. In a second embodiment, the equalizer includes two equalizer units connected in series to compensate for both leading and lagging intersymbol interference.
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公开(公告)号：DE602004000348D1
公开(公告)日：2006-04-13
申请号：DE602004000348
申请日：2004-02-24
Applicant: LUCENT TECHNOLOGIES INC
Inventor： CHANDRASEKHAR SETHUMADHAVAN , CHRAPLYVY ANDREW ROMAN , DOERR CHRISTOPHER RICHARD , WINZER PETER J
Abstract: An improved multi-channel optical equalizer method and apparatus for intersymbol interference mitigation compensates for single- or multi- wavelength channels simultaneously and requires few adjustable parameters. The optical equalizer can also compensate for overshoots and signal transition degradations of a semiconductor optical amplifier. The equalizer unit has only two control signals, one to control signal magnitude and one to control signal phase, yet it can still compensate many wavelength channels simultaneously. The equalizer includes a coupler with a controllable coupling ratio for splitting the light into two portions and a controllable interferometer means having two arms, one arm having an additional delay which is equal to an integer multiple of 1/ DELTA f, where DELTA f is the channel spacing between adjacent wavelengths utilized in the optical system. The controllable interferometer unit also has a controllable delay in a first or second arm for adjusting the relative phase of the light passing therethrough. A coupler combines the two signal portions from the first and second arms to form the equalized output signal. In a second embodiment, the equalizer includes two equalizer units connected in series to compensate for both leading and lagging intersymbol interference.
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公开(公告)号：DE602004000348T2
公开(公告)日：2006-08-24
申请号：DE602004000348
申请日：2004-02-24
Applicant: LUCENT TECHNOLOGIES INC
Inventor： CHANDRASEKHAR SETHUMADHAVAN , CHRAPLYVY ANDREW ROMAN , DOERR CHRISTOPHER RICHARD , WINZER PETER J
Abstract: An improved multi-channel optical equalizer method and apparatus for intersymbol interference mitigation compensates for single- or multi- wavelength channels simultaneously and requires few adjustable parameters. The optical equalizer can also compensate for overshoots and signal transition degradations of a semiconductor optical amplifier. The equalizer unit has only two control signals, one to control signal magnitude and one to control signal phase, yet it can still compensate many wavelength channels simultaneously. The equalizer includes a coupler with a controllable coupling ratio for splitting the light into two portions and a controllable interferometer means having two arms, one arm having an additional delay which is equal to an integer multiple of 1/ DELTA f, where DELTA f is the channel spacing between adjacent wavelengths utilized in the optical system. The controllable interferometer unit also has a controllable delay in a first or second arm for adjusting the relative phase of the light passing therethrough. A coupler combines the two signal portions from the first and second arms to form the equalized output signal. In a second embodiment, the equalizer includes two equalizer units connected in series to compensate for both leading and lagging intersymbol interference.
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公开(公告)号：ATE316722T1
公开(公告)日：2006-02-15
申请号：AT04250980
申请日：2004-02-24
Applicant: LUCENT TECHNOLOGIES INC
Inventor： CHANDRASEKHAR SETHUMADHAVAN , CHRAPLYVY ANDREW ROMAN , DOERR CHRISTOPHER RICHARD , WINZER PETER J
Abstract: An improved multi-channel optical equalizer method and apparatus for intersymbol interference mitigation compensates for single- or multi- wavelength channels simultaneously and requires few adjustable parameters. The optical equalizer can also compensate for overshoots and signal transition degradations of a semiconductor optical amplifier. The equalizer unit has only two control signals, one to control signal magnitude and one to control signal phase, yet it can still compensate many wavelength channels simultaneously. The equalizer includes a coupler with a controllable coupling ratio for splitting the light into two portions and a controllable interferometer means having two arms, one arm having an additional delay which is equal to an integer multiple of 1/ DELTA f, where DELTA f is the channel spacing between adjacent wavelengths utilized in the optical system. The controllable interferometer unit also has a controllable delay in a first or second arm for adjusting the relative phase of the light passing therethrough. A coupler combines the two signal portions from the first and second arms to form the equalized output signal. In a second embodiment, the equalizer includes two equalizer units connected in series to compensate for both leading and lagging intersymbol interference.
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