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公开(公告)号：JP2001285198A
公开(公告)日：2001-10-12
申请号：JP2001058123
申请日：2001-03-02
Applicant: LUCENT TECHNOLOGIES INC
Inventor： BRENER IGAL M , MIKKELSEN BENNY , ROTTWITT KARSTEN , STARK JASON BLAIN
IPC: G02F1/35 , H01S3/06 , H01S3/10 , H01S3/30 , H04B10/02 , H04B10/17 , H04B10/18 , H04B10/29 , H04B10/16
Abstract: PROBLEM TO BE SOLVED: To solve a problem of nonlinearity of fibers in a long distance communication system. SOLUTION: The optical transmission system of this invention in a system employing an optical fiber optical path (especially in a system where a DWDM is used to transmit a power signal with a comparatively high level is sent to a low scattering fiber) is formed to have an optical phase conjugation unit 200 at its alternate iteration site and minimizes the presence of nonlinearity resulting from 4-wave mixing and other Kerr effect. Each fiber span 160 includes a Raman gain to realize 'absorption of negative components' along the length of the fiber 160 thereby realizing a substantially symmetrical power distribution along the length of each span. Then the presence of the symmetrical power distribution at each side face of the optical phase conjugation unit 200 can remarkably enhance the performance.
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公开(公告)号：JPH11177491A
公开(公告)日：1999-07-02
申请号：JP26885098
申请日：1998-09-24
Applicant: LUCENT TECHNOLOGIES INC
Inventor： CARIDI ELISA A , STARK JASON BLAIN
Abstract: PROBLEM TO BE SOLVED: To easily generate a delay pulse and to supply a common broadcast channel to plural WDM receivers by respectively giving a pulse light source to a distribute delay line and M-th delay lines provided with (M-1) pieces of time slots by which an M-th delay line is delayed by M-1 bits. SOLUTION: A short wideband pulse generated in a pulse light source 101 is transmitted to a 1×N (N=M+1) power splitter 103, and N pieces of copy pulses are generated. One of the copy pulses is chirp-fluctuated in a distributed delay line 115 and a beam o light provided with a wavelength which is changes linearly with time is transmitted. Other (N-1) pieces of copy pulses are continuously and respectively delayed by one bit period. After that, whole delay line outputs are coupled in an (N×N) power coupler 131, modulated by a modulator 143 and outputted. As a result, the N-number copy pulses consisting of chirp- fluctuated light with an intermittent period, which are necessary for the plural WDN receivers, are coupled with succeeding (N-1) pieces of wideband light pulses to be outputted.
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3.发明专利
公开(公告)号：JPH11331128A
公开(公告)日：1999-11-30
申请号：JP4084299
申请日：1999-02-19
Applicant: LUCENT TECHNOLOGIES INC
Inventor： BOIVIN LUC , KNOX WAYNE HARVEY , NUSS MARTIN C , STARK JASON BLAIN
IPC: H04J14/08 , H04B10/02 , H04B10/155 , H04J14/00 , H04J14/02
Abstract: PROBLEM TO BE SOLVED: To overcome restriction on the aspect of a capacity which a chirped pulse WDM(wavelength division multiplexing) system holds by further optically multiplexing the chirped pulse wavelength dividing signal. SOLUTION: An optical pulse with a band width exceeding 80 nm is extracted from a mode-locked (fixed) laser 202 with the speed of 36.7 MHz. The spectrum of each pulse is mapper on a time axis by being propagated through a part extending over 16 km of a single mode chirping fiber 204, and the pulse is extended. The chirped pulse is propagated to a modulator 210 through a circulator 207 and a polarization controller 208. After being amplified by a gain- flattened erbium-doped fiber power amplifier(EDFA) 212, this data flow is inputted to an optical multiplexer 214 which is used in an experiment for multiplexing a pseudo-data stream, and the bit rate of the data flow is increased by 64 times and becomes 2.35 Gb/s.
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公开(公告)号：CA2332696C
公开(公告)日：2005-05-03
申请号：CA2332696
申请日：2001-01-26
Applicant: LUCENT TECHNOLOGIES INC
Inventor： STARK JASON BLAIN , ROTTWITT KARSTEN , BRENER IGAL M , MIKKELSEN BENNY PETER
IPC: G02F1/35 , H01S3/06 , H01S3/10 , H01S3/30 , H04B10/02 , H04B10/17 , H04B10/18 , H04B10/29 , H04B10/12
Abstract: An optical transmission system is formed to include an optical phase conjugator at alternate repeater sites to minimize the presence of four-wave mixing and other Kerr effect nonlinearities in systems using optical fiber transmission paths (particularly in systems using DWDM and launching relatively high power signals into the low dispersion fiber). Raman gain is included in each fiber span (o r in alternate fiber spans) so as to provide a "negative absorption" along the length of the fiber and thereby provide for essentially symmetrical power distribution alo ng the length of each span, where the presence of such a symmetric power distributi on on each side of an optical phase conjugator has been found to significantly improve its performance.
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Patent Agency Ranking
公开(公告)号：CA2332696A1
公开(公告)日：2001-09-06
申请号：CA2332696
申请日：2001-01-26
Applicant: LUCENT TECHNOLOGIES INC
Inventor： MIKKELSEN BENNY PETER , BRENER IGAL M , ROTTWITT KARSTEN , STARK JASON BLAIN
IPC: G02F1/35 , H01S3/06 , H01S3/10 , H01S3/30 , H04B10/02 , H04B10/17 , H04B10/18 , H04B10/29 , H04B10/12
Abstract: An optical transmission system is formed to include an optical phase conjugator at alternate repeater sites to minimize the presence of four-wave mixing and other Kerr effect nonlinearities in systems using optical fiber transmission paths (particularly in systems using DWDM and launching relatively high power signals into the low dispersion fiber). Raman gain is included in each fiber span (o r in alternate fiber spans) so as to provide a "negative absorption" along the length of the fiber and thereby provide for essentially symmetrical power distribution alo ng the length of each span, where the presence of such a symmetric power distributi on on each side of an optical phase conjugator has been found to significantly improve its performance.
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公开(公告)号：DE60128281T2
公开(公告)日：2008-01-10
申请号：DE60128281
申请日：2001-02-26
Applicant: LUCENT TECHNOLOGIES INC
Inventor： BRENER IGAL M , MIKKELSEN BENNY PETER , ROTTWITT KARSTEN , STARK JASON BLAIN
Abstract: An optical transmission system is formed to include an optical phase conjugator (200) at alternate repeater sites to minimize the presence of four-wave mixing and other Kerr effect nonlinearities in systems using optical fiber transmission paths (particularly in systems using DWDM and launching relatively high power signals into the low dispersion fiber). Raman gain is included in each fiber span (or in alternate fiber spans) so as to provide a "negative absorption" along the length of the fiber and thereby provide for essentially symmetrical power distribution along the length of each span, where the presence of such a symmetric power distribution on each side of an optical phase conjugator (200) has been found to significantly improve its performance.
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公开(公告)号：DE60128281D1
公开(公告)日：2007-06-21
申请号：DE60128281
申请日：2001-02-26
Applicant: LUCENT TECHNOLOGIES INC
Inventor： BRENER IGAL M , MIKKELSEN BENNY PETER , ROTTWITT KARSTEN , STARK JASON BLAIN
Abstract: An optical transmission system is formed to include an optical phase conjugator (200) at alternate repeater sites to minimize the presence of four-wave mixing and other Kerr effect nonlinearities in systems using optical fiber transmission paths (particularly in systems using DWDM and launching relatively high power signals into the low dispersion fiber). Raman gain is included in each fiber span (or in alternate fiber spans) so as to provide a "negative absorption" along the length of the fiber and thereby provide for essentially symmetrical power distribution along the length of each span, where the presence of such a symmetric power distribution on each side of an optical phase conjugator (200) has been found to significantly improve its performance.
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公开(公告)号：CA2227250C
公开(公告)日：2001-10-30
申请号：CA2227250
申请日：1998-01-19
Applicant: LUCENT TECHNOLOGIES INC
Inventor： HARSTEAD EDWARD ERIC , NUSS MARTIN C , STARK JASON BLAIN , KNOX WAYNE HARVEY
IPC: H04B10/272 , H04J14/02 , H04J14/08 , H04Q11/00
Abstract: A unique time slot is assigned to each of a plurality of wavelengths emitted by a single, centralized wavelength division multiplexed optical sou rce to provide a "bit interleaved" WDM signal. In accordance with an illustrative embodimen t of the present invention, the thus-developed bit-interleaved WDM signal is replicat ed in cascaded stages of amplification and power splitting before data is encoded for respective frequency dependent receivers as, for example, a plurality of pas sive optical networks. Because the output of the optical source need not be encoded with data for the respective receivers until after many stages of splitting and amplificat ion, a small number of time division multiplexing (TDM) modulators synchronized to the so urce may be used to deliver data to potentially tens of thousands of subscribers.
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公开(公告)号：CA2227250A1
公开(公告)日：1998-08-11
申请号：CA2227250
申请日：1998-01-19
Applicant: LUCENT TECHNOLOGIES INC
Inventor： STARK JASON BLAIN , NUSS MARTIN C , HARSTEAD EDWARD ERIC , KNOX WAYNE HARVEY
IPC: H04B10/272 , H04J14/02 , H04J14/08 , H04Q11/00
Abstract: A unique time slot is assigned to each of a plurality of wavelengths emitted by a single, centralized wavelength division multiplexed optical source to provide a "bit interleaved" WDM signal. In accordance with an illustrative embodiment of the present invention, the thus-developed bit-interleaved WDM signal is replicated i n cascaded stages of amplification and power splitting before data is encoded for respective frequency dependent receivers as, for example, a plurality of passive optical networks. Because the output of the optical source need not be encoded with data for the respective receivers until after many stages of splitting and amplification, a small number of time division multiplexing (TDM) modulators synchronized to the source may be used to deliver data to potentially tens of thousands of subscribers.
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