公开(公告)号：JP2000058902A

公开(公告)日：2000-02-25

申请号：JP17027999

申请日：1999-06-16

Applicant: LUCENT TECHNOLOGIES INC

Inventor： DENK WINFRIED ,  LENZ GADI ,  SHMULOVICH JOSEPH ,  XU CHUNHUI

IPC: H01L31/10 ,  H04B10/02 ,  H04B10/43 ,  H04J14/08 ,  H04B10/28

Abstract: PROBLEM TO BE SOLVED: To provide a method in which a time-division multiplexing optical- signal sequence is separated. SOLUTION: In an optical time-division multiplexing system, a waveguide which comprises (m) pieces of electrically insulated photodetectors D1,...Dm is provided, a means 30 by which an optical signal stream containing (m) pieces of interleaved signal sequences is applied to the entrance face of the waveguide is provided, and a means 38 by which optical probe pulses synchronized with the signal stream is applied to the exit face of the waveguide is provided. As a result, the respective probe pulses are overlapped with one set out of different sets of (m) pieces of signals continued inside the waveguide inside the respective photodetectors D1,...Dm, and a nonlinear absorption operation is generated by a two-photon absorption process due to their overlap inside the respective photodetectors D1,...Dm.

公开(公告)号：JP2001305497A

公开(公告)日：2001-10-31

申请号：JP2001019944

申请日：2001-01-29

Applicant: LUCENT TECHNOLOGIES INC

Inventor： LENZ GADI ,  CHRISTIE K MADSEN

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

Abstract: PROBLEM TO BE SOLVED: To provide a single stage all-pass optical filter capable of providing an optical pulse train with an adjustable delay. SOLUTION: The all-pass optical filter has an input port 140 for receiving an input optical pulse having a constant repeating rate, and output port 140, an output port 150, a splitter/combiner 145, and a piece of feedback path 145, and this filter is formed so that a certain time delay period with plural frequency dependence is added to the input optical pulse, and is characterized by a time delay spectrum having plural delayed peaks. A heater 185 is formed on the feedback path 145 so as to be used at the time of tuning the time delay spectrum of the filter.

公开(公告)号：JP2000298296A

公开(公告)日：2000-10-24

申请号：JP2000071393

申请日：2000-03-15

Applicant: LUCENT TECHNOLOGIES INC

Inventor： EGGLETON BENJAMIN JOHN ,  LENZ GADI ,  SLUSHER RICHARD ELLIOTT ,  SPALTER STEFAN HEINZ

IPC: G02B6/02 ,  G02F1/365 ,  H04B10/02 ,  H04B10/18 ,  G02B6/10 ,  G02B6/16

Abstract: PROBLEM TO BE SOLVED: To provide an all-optical means applicable to re-shaping of pulse by selecting an optically nonlinear material and periodic variations, so that a re-shaped optical output pulse becomes an optical output pulse substantially limited in conversion. SOLUTION: A WDM (a system having one or more operating wavelengths) signal from a transmitter 11 is propagated downstream to an amplifier 15, and demultiplexed by a conventional demultiplexer 17. Next, the demultiplexed channels are supplied to each BSPR(Bragg soliton pulse re-shapers) 161-169. Each BSPR is adjusted to a proper wavelength. Next, the reshaped pulses are multiplexed by a conventional multiplexer 18 and propagated downstream to a using means. The BSPR to be used consists of a Bragg diffraction grating formed in a waveguide showing nonlinearity with respect to the electric field of the pulse propagated via the BSPR. Furthermore, the BSPR is selected so that the nonlinearity of the waveguide substantially averages the dispersion, a fixed distorted pulse is substantially limited in conversion.

公开(公告)号：JP2000151513A

公开(公告)日：2000-05-30

申请号：JP30893799

申请日：1999-10-29

Applicant: LUCENT TECHNOLOGIES INC

Inventor： KAZARINOV RUDOLF FEODOR ,  LENZ GADI ,  MADSEN CHRISTI KAY ,  SCOTTI RONALD EDWARD

IPC: G02B6/00 ,  G02B6/12 ,  G02B6/122 ,  G02B6/28 ,  G02B6/34 ,  H04B10/02 ,  H04B10/18 ,  H04L25/03

Abstract: PROBLEM TO BE SOLVED: To provide the full band pass optical filter that reduces dispersion of transmitted optical pulses. SOLUTION: This full band pass optical filter reduces dispersion of optical pulses 120 that are transmitted through the filter. The filter applies a desired phase response to the optical pulses that are transmitted through the filter to reduce the dispersion of the optical pulses. The filter has also a frequency independent amplitude response and has a structure that includes at least one feedback path 145, a splitter/combiner 143, an input port and an output port.

公开(公告)号：JP2000131723A

公开(公告)日：2000-05-12

申请号：JP30555399

申请日：1999-10-27

Applicant: LUCENT TECHNOLOGIES INC

Inventor： EGGLETON BENJAMIN JOHN ,  LENZ GADI

IPC: G02F1/35 ,  G02B6/34 ,  H04B10/18

Abstract: PROBLEM TO BE SOLVED: To eliminate the necessity of using a long optical fiber that a soliton pulse is generated and dispersion is reduced, by allowing a compressor to include a dispersion element having dispersion that adiabatically varies, and allowing the dispersion element to include a chirped transmissive periodic structure. SOLUTION: An adiabatic optical pulse compressor includes a dispersion element which has dispersion that adiabatically varies to compress an inputted pulse into an output soliton pulse. The dispersion element includes a chirped periodic structure. It is desirable that the structure is a transmissive chirped fiber Bragg grating(FBG). A transmitter 11 generates an optical pulse 15 in an optical fiber communication system 10. The pulse 15 goes through a chirped FBG 12 and becomes a compressed conversion limitted soliton pulse 16. The pulse width of the pulse 16 is smaller than the pulse width of the pulse 15. The pulse 16 is coupled to a transmission fiber 13 and propagated to a receiver 14.

公开(公告)号：JP2002131792A

公开(公告)日：2002-05-09

申请号：JP2001258868

申请日：2001-08-29

Applicant: LUCENT TECHNOLOGIES INC

Inventor： LENZ GADI ,  SLUSHER RICHARD ELLIOTT

IPC: G02F1/35 ,  G02F1/355 ,  H01S3/094 ,  H01S3/17 ,  H01S3/30

Abstract: PROBLEM TO BE SOLVED: To provide a Raman light amplifier based on a shorter amplifier fiber and lower pumping power. SOLUTION: The light amplifier 10 is provided with a chalcogenide glass optical waveguide 14 having optical input and output ports connected with the chalcogenide glass optical waveguide 14, a pumping optical waveguide, and wavelength-adjustable pumped laser 12. The pumping optical waveguide connects the wavelength-adjustable pumped laser 12 to the chalcogenide glass optical waveguide 14.

公开(公告)号：JP2001267664A

公开(公告)日：2001-09-28

申请号：JP2001035271

申请日：2001-02-13

Applicant: LUCENT TECHNOLOGIES INC

Inventor： SHMULOVICH JOSEPH ,  BRENER IGAL M ,  LENZ GADI

IPC: G02B6/122 ,  G02F1/365 ,  H01S3/06 ,  H01S3/063 ,  H01S3/067 ,  H01S3/094

Abstract: PROBLEM TO BE SOLVED: To provide a waveguide structure equipped with a pump laser maintaining fixed pump power density. SOLUTION: This waveguide structure includes an Er dope waveguide amplifier and a non-linear waveguide wavelength converter device or an optical fiber. The waveguide structure is provided with a waveguide area formed like a taper shape across a pump propagating distance. This pump propagating distance is set as a prescribed distance between a first pump sit and a second pump site, and pump lights are allowed to propagate for amplifying or converting a signal across the distance between those pump sites. The taper can reduce the depletion of the pump power, and maintain pump power density to be almost fixed across the pump propagating length. Thus, it is possible to reduce the depletion of the pump.

公开(公告)号：JP2001053723A

公开(公告)日：2001-02-23

申请号：JP2000177065

申请日：2000-06-13

Applicant: LUCENT TECHNOLOGIES INC

Inventor： ADAMS LAURA ELLEN ,  ANDERSON JON ,  BROBERG ROBERT MARIO ,  LENZ GADI

IPC: H04J14/00 ,  H04B10/02 ,  H04B10/20 ,  H04J14/02

Abstract: PROBLEM TO BE SOLVED: To obtain an optical add/drop module to improve isolation without increasing cost and a storage loss due to increase of components in a network. SOLUTION: This optical add/drop module(OADM) is constituted by including exactly two thin film filters (TFF) with respective path band wavelength of which approximately coincide with each other in a through path. Each TFF is provided with each across-the-band isolation level to indicate the minimum isolation to be achieved in either wavelength in the path bands. Reflection characteristic curves of each of the two TFFs are at least partially complementary so that an OADM isolation level exceeds logarithmic sum of the across-the- band isolation levels of each of the TFFs.

公开(公告)号：JP2000216463A

公开(公告)日：2000-08-04

申请号：JP2000009589

申请日：2000-01-19

Applicant: LUCENT TECHNOLOGIES INC

Inventor： COLLINGS BRANDON CHRISTOPHER ,  EGGLETON BENJAMIN JOHN ,  GREENBERG KOSONSKI SANDRA ,  LENZ GADI ,  SPALTER STEFAN HEINZ

IPC: H01S3/10 ,  H01S3/06 ,  H01S3/067 ,  H01S3/098 ,  H01S3/108

Abstract: PROBLEM TO BE SOLVED: To provide a laser incorporating a tunable diffraction grating for group speed dispersion compensation. SOLUTION: A laser contains a diffraction grating 11 which is incorporated in a cavity and can be tuned. The diffraction grating 11 generates GVD(group velocity dispersion) with a wavelength detached from an optical forbidden band and GVD compensation and control of dispersion in the hollow are executed. The diffraction grating 11 operates at a transmission mode and reflection in the optical forbidden band is constituted so that it does not affect a laser condition. The diffraction grating 11 can be synchronized and GVD in the hollow can be adjusted. The diffraction grating 11 is an apodized fiber Bragg diffraction grating in the hollow of a mode lock fiber laser in a preferable example. GVD of the fiber diffraction grating can be tuned with a distortion in an axial direction.

公开(公告)号：JPH11242249A

公开(公告)日：1999-09-07

申请号：JP34739498

申请日：1998-12-07

Applicant: LUCENT TECHNOLOGIES INC

Inventor： EGGLETON BENJAMIN JOHN ,  LENZ GADI

IPC: G02B6/02 ,  G02F1/35 ,  G02F1/365 ,  H01S3/00 ,  H04J14/08 ,  G02B6/10

Abstract: PROBLEM TO BE SOLVED: To improve an optical pulse compressor. SOLUTION: This optical pulse compressor comprises a pulse source 10, a nonlinear optical waveguide part 11 provided with a cyclic structure like Bragg gating and a linear optical waveguide part 13 provided with a negative dispersion part and the nonlinear optical waveguide part 11 supplies positive dispersion. The nonlinear waveguide 11 is to be provided with a secondary refractive index (N2 ) which is at least ten folds of the secondary refractive index (N2 ') of the linear waveguide 13. It is preferable that the nonlinear waveguide 11 is a chalcogenide fiber provided with a Bragg grating inside a core 15. Since the size of dispersion is larger by several orders in the grating compared to a standard optical fiber, the length of the nonlinear waveguide part 11 is reduced to several cm by reducing processes for having adverse effects. By modeling, by the grating of the length of about 20 cm, the compression factor of 5 is achieved by initial 60 ps pulses.