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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).
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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.
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公开(公告)号：JP2000098317A
公开(公告)日：2000-04-07
申请号：JP26967599
申请日：1999-09-24
Applicant: LUCENT TECHNOLOGIES INC
Inventor： ROLAND PATRICIO ESPINDRA , STENTZ ANDREW J , WAGENER JEFFERSON LYNN
Abstract: PROBLEM TO BE SOLVED: To correct the waveguide characteristic of a basic mode by disposing a tapered optical fiber in the longitudinal direction where a part of light signal is introduced to the outside of the fiber and enclosing the region with a coating acting on a part of the light signal emitted from the optical fiber in order to correct the propagation characteristic. SOLUTION: The tapered region 18 is enclosed by a coating 24 of variable refractive index or variable loss material. The tapered region 18 executes an operation free from loss to guide a portion, where a basic mode M cannot be disregarded, into the coating 24 enclosing the cladding 16 beyond the cladding 16 or to the outer side thereof when light passes the tapered region 18. The reason why such operation is executed lies in that the diameter ODCORE of the core diminishes. Consequently, the boundary of the basic mode M is weakened and, therefore, the basic mold field diameter increases. When the basic mode M spreads to the outer side of the cladding 16, the propagation action of the basic mode M is selectively changed.
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公开(公告)号：JP2001311973A
公开(公告)日：2001-11-09
申请号：JP2001056619
申请日：2001-03-01
Applicant: LUCENT TECHNOLOGIES INC
Inventor： ACKERMAN DAVID ALAN , BACHER KENNETH L , DAUTREMONT-SMITH WILLIAM C , DU MEI , ROTTWITT KARSTEN , STENTZ ANDREW J , STRASSER THOMAS ANDREW , ZHANG LIMING
Abstract: PROBLEM TO BE SOLVED: To provide a co-propagating Raman amplifying system which provides a sufficient on-off gain without causing pump signal crosstalk and signal pump signal crosstalk at unwanted level, and makes the device useful. SOLUTION: A fiber Raman amplifier is configured to use a co-propagating Raman pumping source, and this is advantageous in various system configurations. One example is a bi-directional communication system. A sufficient optical gain can be obtained with the co-propagating system by carefully configuring pumping source characteristics. These characteristics include the points such as (1) to use at least 50mW optical pump power, (2) to have a relatively large spectrum bandwidth in the pump for suppressing SBS, (3) a frequency difference among all the vertical pump modes of each pump laser is separated by at least a walk-off frequency between a pump laser frequency and a signal frequency, and all the strong vertical modes among individual pump laser are separated by at least an electric frequency bandwidth of a communication system.
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5.发明专利
公开(公告)号：JP2001103014A
公开(公告)日：2001-04-13
申请号：JP2000241962
申请日：2000-08-10
Applicant: LUCENT TECHNOLOGIES INC
Inventor： RANKA JINENDRA KUMAR , STENTZ ANDREW J
IPC: G02F1/35 , G02F1/365 , H01S3/06 , H01S3/10 , H01S3/30 , H04B10/02 , H04B10/17 , H04B10/29 , H04J14/00 , H04J14/02
Abstract: PROBLEM TO BE SOLVED: To provide an optical fiber communication system, using a wavelength converter for a broad-band transmission. SOLUTION: A transmitter 11 outputs signals, including channels λ'1,..., λ'N in a wavelength band outside the bandwidth of an intermediate optical element being a light amplifier 13. These signals are converted into corresponding wavelengths λ1,..., λN by the wavelength converter 21 through a transmission fiber 12. Next, the signals are mapped into the original channels λ'1,..., λ'N by a 2nd wavelength converter 22. The wavelength converters can be based on four-wave mixing(FWM), also uses a secondary nonlinear material, for instance, lithium niobate and can periodically poll it or can use a semiconductor light amplifier.
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Patent Agency Ranking
公开(公告)号：JP2001343673A
公开(公告)日：2001-12-14
申请号：JP2001057526
申请日：2001-03-02
Applicant: LUCENT TECHNOLOGIES INC
Inventor： HANSEN PER BANG , LEE ROBERT B , PARK SEO Y , REED WILLIAM ALFRED , STENTZ ANDREW J
Abstract: PROBLEM TO BE SOLVED: To avoid the instability of modulation and the effect of the four-wave mixing in a Raman-amplification optical transmission system. SOLUTION: A transmission fiber which is used in the Raman-amplification optical transmission system is constituted so as to exhibit specific characteristics for restricting the instability of modulation and the four-wave mixing in an amplification area and, as a result, noise constituting elements existing in the transmission system are reduced.
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公开(公告)号：JP2000228548A
公开(公告)日：2000-08-15
申请号：JP2000026927
申请日：2000-02-04
Applicant: LUCENT TECHNOLOGIES INC
Inventor： STENTZ ANDREW J
Abstract: PROBLEM TO BE SOLVED: To improve amplification performance by providing a secondary pump source and a gain fiber for amplifying a primary pump at downstream from the primary pump source and a power sensitive component. SOLUTION: In a distributed Raman amplifier 9 for amplifying an optical signal propagating in a transmission fiber, a secondary pump source 12 and a gain fiber 14 for amplifying a primary pump λP1 are arranged at downstream from a primary pump source 10 and a power sensitive component 11. Then, by means of the gain fiber 14 as a coupler, a secondary pump λP2 from the secondary pump source 12 proceeds together with the primary pump λP1 along a certain length of fiber 14 and a part of fiber 16 so that Raman amplification of the pump λP1 is enabled.
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8.发明专利
公开(公告)号：JPH1172629A
公开(公告)日：1999-03-16
申请号：JP20416098
申请日：1998-07-21
Applicant: LUCENT TECHNOLOGIES INC
Inventor： DIGIOVANNI DAVID JOHN , STENTZ ANDREW J
Abstract: PROBLEM TO BE SOLVED: To provide a graded fiber bundle for inputting, outputting and coupling light to a clad pumping fibers device with low loss without the need for a polishing or reflection preventive film and without the need for maintaining the alignment of a bulk optical system. SOLUTION: The light is coupled from plural semiconductor emitters through the graded fiber bundle fusion spliced to the clad pumping fibers 15 to the clad pumping fibers 15. The individual semiconductor wide stripe emitters may be coupled to individual multimode fibers 11. The individual fibers 11 are bundled in proximity, are heated to a m.p., are drawn to tapers and are next fusion spliced to the clad pumping fibers 15. The tapers are advantageous when the tapers are coated with a clad material like a low-refractive index polymer. In addition, the fibers including single mode cores may be included within the fiber bundle. The single mode cores are usable for coupling the light into the single mode cores of the clad pumping fibers 15 or outside from the cores.
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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.
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公开(公告)号：JP2000214503A
公开(公告)日：2000-08-04
申请号：JP2000009590
申请日：2000-01-19
Applicant: LUCENT TECHNOLOGIES INC
Inventor： STENTZ ANDREW J , WALKER KENNETH LEE
IPC: G02F1/35 , H01S3/06 , H01S3/094 , H01S3/30 , H04B10/17 , H04B10/29 , H04J14/00 , H04J14/02 , H04B10/16
Abstract: PROBLEM TO BE SOLVED: To realize a low noise, a long fiber span and low nonlinearity by providing one or plural high order dispersion Raman effect amplifiers on a poststage of a light source. SOLUTION: Plural Raman amplifiers 10 are provided on the poststage of a signal light source along a transmission line 12 over the whole length of the transmission line 12. The amplifier 10 is preferred to be provided on an end part of a middle of a continuous fiber segment. The usual high order Raman amplifier 10 is constituted of one or above of Raman pump light source 20A and one or above of secondary Raman pump light source 20B. The light sources 20A, 20B are usually semiconductor lasers connected with a thing such as a connector transmission line segment 21. These are connected in the fiber transmission lines 12 by a wavelength division multiplexing device 22. This advantage exists in a point that the cross talk is reduced through a pump beam by that a λP1 beam of a primary pump is propagated in opposite direction for a communication signal beam λS in the transmission line 12.
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