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    OPTICAL WDM TRANSMISSION SYSTEM
    1.
    发明专利
    OPTICAL WDM TRANSMISSION SYSTEM 审中-公开

    公开(公告)号：JP2002290332A

    公开(公告)日：2002-10-04

    申请号：JP2002012098

    申请日：2002-01-21

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： DU MEI ,  NIELSEN TORBEN N ,  ROTTWITT KARSTEN ,  STENTZ ANDREW J

    IPC: G02F1/35 ,  H01S3/067 ,  H01S3/094 ,  H01S3/10 ,  H01S3/30 ,  H04B10/02 ,  H04B10/17 ,  H04B10/18 ,  H04J14/00 ,  H04J14/02

    Abstract: PROBLEM TO BE SOLVED: To provide a WDM optical transmission system using high co- propagating Raman amplification. SOLUTION: The user of a co-propagating fiber Raman amplifier in an optical WDM transmission system has been found to be practical in the situation where the fiber amplifier is operated into depletion and the characteristics of the input signals are controlled to exhibit a reduced integrated relative intensity noise (RIN) over the fiber crosstalk bandwidth. In particular, the reduction in the integrated RIN can be achieved by increasing the number of input channels (by adding more messages or simply using dummy channels), encoding the data in a particular fashion to reduced the integrated RIN, or decorrelating the plurality of N input signals below a predetermined, relatively low frequency (for example, 2 MHz).

    METHOD FOR REALIZING OPTICAL COMMUNICATION SYSTEM
    2.
    发明专利
    METHOD FOR REALIZING OPTICAL COMMUNICATION SYSTEM 失效

    公开(公告)号：JP2000244398A

    公开(公告)日：2000-09-08

    申请号：JP2000035785

    申请日：2000-02-14

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： HANSEN PER B ,  NIELSEN TORBEN N ,  STENTZ ANDREW J

    IPC: H04B10/02 ,  H04B10/12 ,  H04B10/135 ,  H04B10/14 ,  H04B10/17 ,  H04B10/18 ,  H04B10/2581 ,  H04J14/00 ,  H04J14/02 ,  H04B10/13

    Abstract: PROBLEM TO BE SOLVED: To realize reduction of disadvantages due to fiber non-linearity by relaxing a non-linear interaction which limits the number of channels through deterioration of system performance using a prescribed remote pumping amplification system arranged so that a prescribed parameter range can be obtained. SOLUTION: An optical signal from a light source 100 is made incident to a booster amplifier 105 which is an individual Er-doped fiber amplifier, and then made incident to a first fiber span 110. The fiber span 110 is terminated at a repeater 135. A Raman pumping source 120 is set in the repeater 135 to remotely pump a fiber core in the fiber span 110 disposed directly in front of the repeater 135. Moreover, an Er-doped fiber amplifier 125 which is constituted of three individual amplifier stages 125.1-125.3 is arranged in the repeater 135. The gain flattening of the composite gain spectrum of the cascade-connected amplifiers can be realized by a normal design principle.

    OPTICAL COMMUNICATION SYSTEM EQUIPMENT WITH AUTOMATIC DISTRIBUTION COMPENSATING MODULE
    3.
    发明专利
    OPTICAL COMMUNICATION SYSTEM EQUIPMENT WITH AUTOMATIC DISTRIBUTION COMPENSATING MODULE 失效

    公开(公告)号：JP2000244394A

    公开(公告)日：2000-09-08

    申请号：JP2000040395

    申请日：2000-02-18

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： EGGLETON BENJAMIN JOHN ,  NIELSEN TORBEN N ,  ROGERS JOHN A ,  STRASSER THOMAS ANDREW ,  WALKER KENNETH LEE

    IPC: H04B10/02 ,  H04B10/18

    Abstract: PROBLEM TO BE SOLVED: To optimize the performance of an optical communication system by providing a data maintenance monitor, and adjusting dispersion elements so that the performance of this system is optimized, and deciding the distribution of grating according to the strength of added currents, detecting the maintenance of transmitted data and controlling the currents to be added to the grating. SOLUTION: Each automatic distribution compensating module 20 is provided with a variable distribution compensator 30, a data maintenance monitor 31 and a feedback network 32, and the monitor 31 adjusts the distribution compensator 30 through the feedback network 32 so that the performance of this system is optimized. Part of a signal on a transmission fiber path 11 is sampled, for example, by a tap 34, and this signals is analyzed so that the scale of the maintenance of the transmitted data can be obtained, and a feedback signal for controlling a variable distribution compensation grating 33 can be obtained from this scale. In the variable distribution compensator 30, a signal light from the transmission fiber 11 is directed to the variable distribution compensation grating 33.

    LIGHT TRANSMISSION SYSTEM
    4.
    发明专利
    LIGHT TRANSMISSION SYSTEM 失效

    公开(公告)号：JP2001281715A

    公开(公告)日：2001-10-10

    申请号：JP2001056620

    申请日：2001-03-01

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： NIELSEN TORBEN N ,  ROTTWITT KARSTEN ,  STENTZ ANDREW J

    IPC: G02F1/35 ,  H01S3/06 ,  H01S3/30 ,  H04B10/02 ,  H04B10/17 ,  H04B10/18 ,  H04B10/29 ,  H04J14/00 ,  H04J14/02 ,  H04B10/16

    Abstract: PROBLEM TO BE SOLVED: To prevent a four-wave mixed component from being generated in signal bands at the time of performing the Raman amplification of optical signals propagating through an optical fiber. SOLUTION: This light transmission system 10 has two exciting light sources 18, 20 in order to perform the Raman amplification of optical signals poured into an optical fiber 16 from a light source 12 via an isolator 14 and amplifies the optical signals being in a C band (1,530 nm to 1,562 nm) and an L band (1,575 nm to 1,604 nm) by injecting exciting waves into the optical fiber 16 via a multiplexer 22. The exciting signals are selected so as to realize a relatively wide and flat composite gain spectrum having a band width wider by 50% or more than a band width to be generated by a single wavelength excitation, and also, are selected so as to prevent the four-wave mixed component from existing in either the C band or the L band.

    OPTICAL WAVELENGTH ADD/DROP MULTIPLEXER AND FILTER ELEMENT TO BE USED THEREFOR
    5.
    发明专利
    OPTICAL WAVELENGTH ADD/DROP MULTIPLEXER AND FILTER ELEMENT TO BE USED THEREFOR 失效

    公开(公告)号：JP2001217777A

    公开(公告)日：2001-08-10

    申请号：JP2000383710

    申请日：2000-12-18

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： SPECTOR MAGALY ,  NIELSEN TORBEN N ,  THOMPSON WILLIAM A

    IPC: G02B5/18 ,  G02B6/293 ,  H04B10/02 ,  H04J14/02

    Abstract: PROBLEM TO BE SOLVED: To improve flexibility in the channel selection for an applied optical wavelength-division add/drop multiplexer(WADM) signal at low cost. SOLUTION: A WADM is formed to branch/insert at least two signals each associated with one of a plurality of channels among wavelength division multiplexed(WDM) signals. A WADM 100 comprises an optical circulator 130 and that optical circulator is optically coupled to at least two of fiber Bragg gratings(FBG) 132, 134, 136 and 138 which are interconnected in series at one port and optically coupled to a thin film filter 120 having at least two thin film filter elements 122, 124, 126 and 128 which are interconnected in series at the other port.

    OPTICAL ROUTER
    6.
    发明专利
    OPTICAL ROUTER 失效

    公开(公告)号：JPH1062826A

    公开(公告)日：1998-03-06

    申请号：JP15206697

    申请日：1997-06-10

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： BARROS MIRIAM R DE ,  ESKILDSEN LARS ERIK ,  NYKOLAK GERALD ,  VENGSARKAR ASHISH MADHUKAR ,  NIELSEN TORBEN N ,  TANBUN-EK TAWEE

    IPC: G02B6/293 ,  G02F1/313 ,  H04B10/02 ,  H04J14/00 ,  H04J14/02 ,  H04Q11/00

    Abstract: PROBLEM TO BE SOLVED: To obtain an optical router which is easily producible from a not costly optical fiber element and does not require an optical device or integrated optical element of a bulk type by constituting the optical router of an electronic element (phase controller), a directional coupler made of a fiber, a reflection grating filter made of a fiber, a tap made of a fiber and a phase modulator made of a fiber. SOLUTION: An input wavelength is equally divided to a port 2 and a port 3 by the coupler 10. The phase modulator 12 imparts a small dither signal to the phase of the light from the port 3. A reflector 11A and a reflector 11B returns the one wavelength to the coupler 10 while matching. Both of the two reflected optical powers interfere with each other in the coupler 10 based on their overall phase. The tap 13 samples the interference of the reflected light power and the dither signal. The tap 13 applies the samples of the interference signal and the dither signal to the controller 14. The controller 14 analyzes the dither signal and forms a compensation voltage in the phase modulator 12.

    OPTICAL WAVELENGTH ADD/DROP MULTIPLEXER FOR DUAL SIGNAL TRANSMISSION RATES
    10.
    发明专利
    OPTICAL WAVELENGTH ADD/DROP MULTIPLEXER FOR DUAL SIGNAL TRANSMISSION RATES 未知

    公开(公告)号：CA2327050A1

    公开(公告)日：2001-06-16

    申请号：CA2327050

    申请日：2000-11-29

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： SPECTOR MAGALY ,  NIELSEN TORBEN N ,  THOMPSON WILLIAM A

    IPC: G02B5/18 ,  G02B6/293 ,  H04B10/02 ,  H04J14/02

    Abstract: An optical wavelength add/drop multiplexer (WADM) is configured to aced or drop two or more signals each associated with one of a plurality of channels in a wavelength division multiplexed (WDM) signal. The WADM comprises an optical circulator that is optically coupled at one port to two or more serially interconnected fiber Bragg gratings (FBGs), and is optically coupled at another port to a thin film filter including two or more serially interconnected thi n film filter elements. Each of the two or more FBGs is matched with a thin film filter element, both arranged to be responsive to signals associated with one of th e plurality of channels. Bandwidth and dispersion properties for the FBGs are selected to permit operation of the WADM at two distinct signal data rates. To equalize associated insertion losses in embodiments of the invention arrange d to add or drop two or more signals, the FBGs are matched to the thin film fitter elements in inverse order with respect to their optical distance from the optical circulator.

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