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1. 发明专利

JP2001160784A METHOD FOR REPRODUCING WAVELENGTH-DIVIDED/MULTIPLEXED OPTICAL SIGNAL 失效
公开(公告)号：JP2001160784A
公开(公告)日：2001-06-12
申请号：JP2000285377
申请日：2000-09-20
申请人： CIT ALCATEL
发明人： BIGO SEBASTIEN , MESTRIC ROLAND
IPC分类号： H04B10/2507 , H04B10/291 , H04J14/00 , H04J14/02 , H04B10/152
摘要： PROBLEM TO BE SOLVED: To provide a wavelength-divided/multiplexed optical signal reproducing method. SOLUTION: A wavelength-divided/multiplexed optical signal reproducer is inserted between two optical fiber sections in a wavelength-divided/ multiplexed optical fiber transmission system comprising a transmission line constituted of plural optical fiber sections and supplying N-pieces of channels different in wavelengths by setting N as an integer larger than '1'. The reproducer comprises a demultiplexer for multiplex-releasing an optical signal whose wavelength is divided/multiplexed into N-pieces of individual channels and a multiplexer for multiplexing the optical signal to a multiplexed light signal at the outputs of N-pieces of individual cannels. The individual cannels comprise saturable absorbers for re-shaping the light signals of the respective channels and delay lines. The lengths of the delay lines are selected so that total delay τn" is introduced between the (n+1)-th channel and the n-th channel in such as way that a time lag τn is obtained between the (n+1)-th channel and the n-th channel.

2. 发明专利

JP2000196525A METHOD FOR REDUCING INTENSITY DISTORTION CAUSED BY MUTUAL PHASE MODULATION IN WDM OPTICAL FIBER TRANSMISSION SYSTEM 失效
公开(公告)号：JP2000196525A
公开(公告)日：2000-07-14
申请号：JP35694999
申请日：1999-12-16
申请人： CIT ALCATEL
发明人： BIGO SEBASTIEN , BELLOTTI GIOVANNI
IPC分类号： H01S3/10 , H01S3/06 , H04B10/2519 , H04B10/2525 , H04B10/2557 , H04J14/00 , H04J14/02 , H04B10/02 , H04B10/16 , H04B10/17 , H04B10/18
摘要： PROBLEM TO BE SOLVED: To reduce the distortion of intensity in a WDM optical fiber transmission system by introducing time offset between channels in each repeater for mutually connecting 1st and 2nd continuous fiber segments. SOLUTION: The WDM optical fiber transmission system 1 includes a transmission line 7 consisting of plural optical fiber segments TF arranging a repeater 9 between continuous optical fiber segments TF. Time offset is introduced between channels so that the (n+1)-th and n-th channels are offset only by τn on the entrance of the 2nd segment TF as compared with the entrance of the 1st segment TF. Here (n) is an integer equal to or smaller than N and τn is selected so as to be larger than zero and smaller than a value for canceling the correlation in the contribution to the intensity distortion between respective optical fiber segments TF.

3. 发明专利

JP2001285255A WAVELENGTH DIVISION MULTIPLEX TRANSMISSION SYSTEM USING ASYMMETRICAL FILTERING 失效
公开(公告)号：JP2001285255A
公开(公告)日：2001-10-12
申请号：JP2001058810
申请日：2001-03-02
申请人： CIT ALCATEL
发明人： FRIGNAC YANN , BIGO SEBASTIEN
IPC分类号： H04J14/00 , H04B10/2563 , H04J14/02
摘要： PROBLEM TO BE SOLVED: To provide a wavelength division multiplex transmission system that can improve a spectrum efficiency while maintaining a frequency selected by frequency grids at a prescribed interval. SOLUTION: A spectral interval of one channel with respect to one-side adjacent channel differs from a spectral interval of the one channel with respect to the other side adjacent channel. A demultiplexed filter in use can more strongly attenuate the spectrum of the channel at a smaller spectral interval with respect to the adjacent channel.

4. 发明专利

JPH11243370A METHOD FOR REDUCING COLLISION-INDUCED JITTER WITH WAVEFORM EXCHANGE IN OPTICAL FIBER TRANSMISSION SYSTEM USING SOLITON SIGNAL AND WAVEFORM DIVISION MULTIPLEXING 失效
公开(公告)号：JPH11243370A
公开(公告)日：1999-09-07
申请号：JP33287798
申请日：1998-11-24
申请人： CIT ALCATEL
发明人： LECLERC OLIVIER , BIGO SEBASTIEN
IPC分类号： G02F1/35 , G02B6/293 , H04B10/02 , H04B10/18 , H04J14/00 , H04J14/02
摘要： PROBLEM TO BE SOLVED: To limit time jitter owing to collision between solitons by exchanging the wavelengths of two channels in such a manner that a signal transmitted with a certain wavelength from an upper half is transmitted by a signal transmitted a certain wavelength from a lower half. SOLUTION: A wavelength allocation system which compensates that the bit transmission time of various channels is synchronized or is pseudo- synchronized in a fixed period ZR is used. Plural repeaters 21 to 2m are provided along a transmission system and channels are exchanged between each pair of adjacent repeaters at a place with the same distance from the respective repeaters. The transmission system also includes plural channel exchanges 31 to 3m . For instance, each device exchanges all of the channels of a multiple signal by transmitting a signal received in the channel of a wavelength λ1 in a wavelength λn+i+1 and also making all values in which (i) is possible from 1 to (n) to be transmitted in such a way. For instance, when (n) is an even number, each channel transmitted in a wavelength of the lower half is transmitted in a wavelength of the upper half.

5. 发明专利

JP2001148668A DEVICE FOR LIMITING NOISE AT 'ZERO' OF OPTICAL RZ SIGNAL 失效
公开(公告)号：JP2001148668A
公开(公告)日：2001-05-29
申请号：JP2000292747
申请日：2000-09-26
申请人： CIT ALCATEL
发明人： PINCEMIN ERWAN , BIGO SEBASTIEN
IPC分类号： H04B10/2507 , H04L25/02 , H04B10/152
摘要： PROBLEM TO BE SOLVED: To provide a device for limiting the noise at 'zero' of transmitted optical RZ signals in a soliton signal transmission system. SOLUTION: This device is composed of a double refraction fiber for mutually shifting the spectrums of signals corresponding to strength and a filter for filter-processing the shifted signals. The filter attenuates the pulses corresponding to 'zero' and makes the pulses pass through corresponding to '1'.

6. 发明专利

JP2001027770A CORRECTION OF RAMAN EFFECT BY PUMPING IN MULTIWAVELENGTH TRANSMISSION SYSTEM 失效
公开(公告)号：JP2001027770A
公开(公告)日：2001-01-30
申请号：JP2000171012
申请日：2000-06-07
申请人： CIT ALCATEL
发明人： BIGO SEBASTIEN , HAMAIDE JEAN-PIERRE , GAUCHARD STEPHANE
IPC分类号： G02F1/35 , H01S3/06 , H01S3/10 , H01S3/30 , H04B10/2537 , H04J14/00 , H04J14/02 , H04B10/16 , H04B10/17
摘要： PROBLEM TO BE SOLVED: To correct tilt in the spectral gain caused by amplification by the induced Raman effect, by selecting the wavelength and power of a pump so as to correct the tilt caused by the amplification by the induced Raman effect in the signal in a specified frequency range. SOLUTION: The system is equipped with a fiber in which signals propagate in 1535.04 to 1559.79 nm wavelength range, and a means to inject at least one pumping light having a shorter wavelength than the above range into the fiber, and the wavelength and power of the pump are selected to correct the tilt in the signal in a specified frequency range caused by the amplification by the induced Raman effect. Namely, the amplification gain by the induced Raman effect caused by pumping is selected so as to correct the tilt caused by the Raman effect on a plurality of channels, and the power of pumping is controlled to correct the tilt caused by the amplification by the induced Raman effect in the first channel.

7. 发明专利

DE69736645D1 未知
公开(公告)号：DE69736645D1
公开(公告)日：2006-10-26
申请号：DE69736645
申请日：1997-01-27
申请人： CIT ALCATEL
发明人： BIGO SEBASTIEN
IPC分类号： G02F1/35 , H04B10/00
摘要： The non-linear optical mirror (NOLM) is formed in a loop of optical fibre, with its operation being independent of the polarisation of the signals offered on the signal and control inputs (wavelengths lambda-s and lambda-c respectively). The loop is composed of four sections (T1, T2, T3, T4) of fibre maintaining polarisation and of equivalent optical length. These sections are linked by three splices (E1, E2, E3) at three locations. At the first and third splices, the neutral propagation axes of the fibre are turned by 90 degrees. At the second splice a mode converter is inserted in the loop. This comprises an optical demultiplexer and multiplexer, as well as two optical channels connecting them. The demultiplexer divides the two signals (lambda-s and lambda-c) into the two channels. The channel carrying the control signal effects a 90 degree rotation. On the other channel there is no rotation. The multiplexer then recombines the two signals.

8. 发明专利

AT339707T 未知
公开(公告)号：AT339707T
公开(公告)日：2006-10-15
申请号：AT97400183
申请日：1997-01-27
申请人： CIT ALCATEL
发明人： BIGO SEBASTIEN
IPC分类号： G02F1/35 , H04B10/00
摘要： The non-linear optical mirror (NOLM) is formed in a loop of optical fibre, with its operation being independent of the polarisation of the signals offered on the signal and control inputs (wavelengths lambda-s and lambda-c respectively). The loop is composed of four sections (T1, T2, T3, T4) of fibre maintaining polarisation and of equivalent optical length. These sections are linked by three splices (E1, E2, E3) at three locations. At the first and third splices, the neutral propagation axes of the fibre are turned by 90 degrees. At the second splice a mode converter is inserted in the loop. This comprises an optical demultiplexer and multiplexer, as well as two optical channels connecting them. The demultiplexer divides the two signals (lambda-s and lambda-c) into the two channels. The channel carrying the control signal effects a 90 degree rotation. On the other channel there is no rotation. The multiplexer then recombines the two signals.

9. 发明专利

FR2839221A1 未知
公开(公告)号：FR2839221A1
公开(公告)日：2003-10-31
申请号：FR0205377
申请日：2002-04-29
申请人： CIT ALCATEL
发明人： RUILIER CYRIL , BIGO SEBASTIEN , CHESNOY JOSE , SANSONETTI PIERRE
IPC分类号： H04B10/2525 , H04B10/18 , H04J14/02 , G02B6/16
摘要： The optical fiber has a positive chromatic dispersion and a negative chromatic dispersion slope, for a predetermined wavelength value, in a propagation mode other than fundamental mode. The propagation mode has circular symmetry. An Independent claim is also included for transmission system.

10. 发明专利

FR2805944B1 未知
公开(公告)号：FR2805944B1
公开(公告)日：2002-05-31
申请号：FR0002754
申请日：2000-03-03
申请人： CIT ALCATEL
发明人： FRIGNAC YANN , BIGO SEBASTIEN
IPC分类号： H04B10/2563 , H04J14/02 , H04J14/00 , H04B10/12
摘要： The invention relates to a wavelength division multiplex transmission system; for one channel, the spectral interval between adjacent channels on one side is different from the spectral interval between adjacent channels on the other side. A demultiplexing filter is used which attenuates more strongly the spectrum of the channel on the side on which the spectral interval between adjacent channels is smaller. The invention improves spectral efficiency and retains frequencies chosen from a grid of regularly spaced frequencies.

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