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    22.
    发明专利
    未知

    公开(公告)号：DE69825401T2

    公开(公告)日：2005-08-11

    申请号：DE69825401

    申请日：1998-12-01

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： EGGLETON BENJAMIN JOHN ,  LENZ GADI

    IPC: G02B6/02 ,  G02F1/35 ,  G02F1/365 ,  H01S3/00 ,  H04J14/08 ,  H04B10/12

    Abstract: In accordance with the invention, an optical pulse compressor comprises a pulse source (10), a section of nonlinear optical waveguide (11) including a periodic structure such as Bragg grating (12), for providing positive dispersion and a section of linear optical waveguide (13) including a negative dispersion component (14). The nonlinear waveguide should have a second order index N2 at least ten times the second order index N2' of the linear waveguide. The nonlinear waveguide is preferably chalcogenide fiber, with a Bragg grating photoinduced into the core. Because the grating is 4-5 orders of magnitude more dispersive than standard optical fiber, the length of the nonlinear waveguide section can be scaled down to a few centimeters with accompanying reduction of deleterious processes. Modeling suggests that compression factors of 5 with an initial 60 ps pulse are achievable with grating lengths of about 20 cm.

    23.
    发明专利
    未知

    公开(公告)号：DE60100957T2

    公开(公告)日：2004-09-02

    申请号：DE60100957

    申请日：2001-01-15

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： LENZ GADI ,  MADSEN CHRISTI KAY

    IPC: G02B5/28 ,  G02B5/20 ,  G02F1/01 ,  H04B10/02 ,  H04B10/155 ,  H04B10/18 ,  H04J14/08

    Abstract: A single-stage all-pass optical filter is disclosed that may be applied to generate a large tunable delay of an optical pulse train. The all-pass optical filter includes an input port for receiving an input optical pulse having a regular repetition rate; an output port; a splitter/combiner; and one feedback path. A plurality of frequency-dependent time delay periods are applied to the input optical pulse so that the filter is characterized by a time-delay spectrum having a plurality of delay peaks. The free-spectral range (FSR) of the filter, i.e., the spacing between the delay peaks, is matched to the regular repetition rate of the input optical pulse. This matching is accomplished by the FSR being equal to the repetition rate or offset from the repetition rate to a sufficiently small degree that each frequency of the pulse train will fall within the bandwidth of one of the plurality of delay peaks. This single-stage all-pass optical filter is advantageous for correcting linear chirp of a pulsed laser or synchronizing control signals in an optical time-division multiplexer/demultiplexer system.

    24.
    发明专利
    未知

    公开(公告)号：DE69902216T2

    公开(公告)日：2003-02-20

    申请号：DE69902216

    申请日：1999-10-22

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： EGGLETON BENJAMIN JOHN ,  LENZ GADI

    IPC: G02F1/35 ,  G02B6/34 ,  H04B10/18 ,  H04B10/12 ,  G02B6/293 ,  H01S3/00

    Abstract: Optical pulse compression is of importance in very high bit rate optical fiber communication systems. We are disclosing an adiabatic optical pulse compressor that can achieve substantial compression by means of a relatively short (e.g., about 100 cm) chirped periodic structure, exemplarily an apodized and chirped fiber Bragg grating (12). The input pulse to the periodic structure typically are not soliton pulses (15), but the passage through the periodic structure results in transformation of the pulses into substantially transform-limited soliton pulses (16) that are available (typically after appropriate modification) for transmission through conventional optical fiber towards utilization means. The input pulses can be generated by any applicable method, e.g., by combining the cw outputs of two lasers that differ with regard to the frequency of their output.

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