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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
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.
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公开(公告)号：JP2001223647A
公开(公告)日：2001-08-17
申请号：JP2000396383
申请日：2000-12-27
Applicant: LUCENT TECHNOLOGIES INC
Inventor： BODE DIRK , HYUN VICTOR S , ISRAEL JOHN G , LINGNER GERARD III , MCKAY BRADLEY A , NADHUMI PRASANNA R , THOMPSON WILLIAM A
IPC: G02F1/35 , H01S3/06 , H01S3/10 , H04B10/04 , H04B10/06 , H04B10/14 , H04B10/17 , H04B10/29 , H04J14/08 , H04B10/16
Abstract: PROBLEM TO BE SOLVED: To improve the reaction of conventional optical amplifiers on the downstream in an optical transmission system, having the optical amplifiers placed along an optical transmission path, when the optical amplifiers encounters a change in the intensity level of an input optical signal. SOLUTION: Each of a series of the optical amplifiers is adjusted, so as to regulate a specific amplifier parameter at a small step in reaction to the detection of a specific stimulus, caused by an input or the reception of a regulation start message from an upstream amplifier and to complete the regulation at a large step when no regulation start message is received within a prescribed time elapse from the start of the regulation reacting to the detection of the stimulus. Receiving the regulation start message, each optical amplifier continues the regulation, and completes the regulation at a large step, when a regulation end message has been received from the up-stream optical amplifier. Each optical amplifier transmits regulation end message to the next, downstream amplifier, if the optical amplifier is not the end amplifier at thst time.
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公开(公告)号：JP2002077062A
公开(公告)日：2002-03-15
申请号：JP2001197608
申请日：2001-06-29
Applicant: LUCENT TECHNOLOGIES INC
Inventor： THOMPSON WILLIAM A
Abstract: PROBLEM TO BE SOLVED: To provide a bi-directional optical transmission system employing a single optical fiber and dual channel bands. SOLUTION: This system transmits x-channels through a single fiber that sequentially connects nodes. Since this system uses only two optical transmission bands, this system has an advantage of minimizing a loss in the separation of signals in the two bands. In the optical transmission in two directions, the transmission is separated in terms of spectrums (wavelength/frequency) in addition to that the directions are separated. Since only two bands are used, a low loss broadband thin film optical filter can be used to combine/separate the signals. By selecting a method for alternate arrangement of optical filters in the two separate bands, the optical performance of the entire system is maximized and remarkably reduce the insertion loss.
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公开(公告)号：DE60023044T2
公开(公告)日：2006-06-22
申请号：DE60023044
申请日：2000-12-12
Applicant: LUCENT TECHNOLOGIES INC
Inventor： BODE DIRK , HYUN VICTOR S , ISRAEL JOHN G , LINGNER GERARD T , MCKAY BRADLEY A , NADHUMI PRASANNA R , THOMPSON WILLIAM A
IPC: G02F1/35 , H04B10/17 , H01S3/06 , H01S3/10 , H04B10/04 , H04B10/06 , H04B10/14 , H04B10/29 , H04J14/08
Abstract: Each of a series of optical amplifiers is arranged such that, in response to detecting particular stimuli occurring at an input or receipt of an adjustment start message from an upstream amplifier, adjusts certain amplifier parameters using small steps and completes the adjustment using large steps if it does not receive the adjustment start message within a predetermined period of time of starting the adjustment in response to detecting the stimuli. If the optical amplifier receives the adjustment start message, then it continues to perform the adjustment and completes the adjustment using large steps when it receives an adjustment done message from the upstream optical amplifier. At that point, the optical amplifier sends an adjustment done message to the next downstream amplifier if it is not the tail-end amplifier.
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公开(公告)号：DE60019540T2
公开(公告)日：2006-02-23
申请号：DE60019540
申请日：2000-12-12
Applicant: LUCENT TECHNOLOGIES INC
Inventor： BODE DIRK , HYUN VICTOR S , ISRAEL JOHN G , LINGNER GERARD T , MCKAY BRADLEY A , NADHUMI PRASANNA R , THOMPSON WILLIAM A
IPC: G02F1/35 , H01S3/06 , H01S3/10 , H04B10/04 , H04B10/06 , H04B10/14 , H04B10/17 , H04B10/29 , H04J14/08
Abstract: Each of a series of optical amplifiers is arranged such that, in response to detecting particular stimuli occurring at an input or receipt of an adjustment start message from an upstream amplifier, adjusts certain amplifier parameters using small steps and completes the adjustment using large steps if it does not receive the adjustment start message within a predetermined period of time of starting the adjustment in response to detecting the stimuli. If the optical amplifier receives the adjustment start message, then it continues to perform the adjustment and completes the adjustment using large steps when it receives an adjustment done message from the upstream optical amplifier. At that point, the optical amplifier sends an adjustment done message to the next downstream amplifier if it is not the tail-end amplifier.
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Patent Agency Ranking
公开(公告)号：DE60023044D1
公开(公告)日：2005-11-10
申请号：DE60023044
申请日：2000-12-12
Applicant: LUCENT TECHNOLOGIES INC
Inventor： BODE DIRK , HYUN VICTOR S , ISRAEL JOHN G , LINGNER GERARD T , MCKAY BRADLEY A , NADHUMI PRASANNA R , THOMPSON WILLIAM A
IPC: G02F1/35 , H01S3/06 , H01S3/10 , H04B10/04 , H04B10/06 , H04B10/14 , H04B10/17 , H04B10/29 , H04J14/08
Abstract: Each of a series of optical amplifiers is arranged such that, in response to detecting particular stimuli occurring at an input or receipt of an adjustment start message from an upstream amplifier, adjusts certain amplifier parameters using small steps and completes the adjustment using large steps if it does not receive the adjustment start message within a predetermined period of time of starting the adjustment in response to detecting the stimuli. If the optical amplifier receives the adjustment start message, then it continues to perform the adjustment and completes the adjustment using large steps when it receives an adjustment done message from the upstream optical amplifier. At that point, the optical amplifier sends an adjustment done message to the next downstream amplifier if it is not the tail-end amplifier.
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公开(公告)号：CA2345181C
公开(公告)日：2005-01-11
申请号：CA2345181
申请日：2001-04-25
Applicant: LUCENT TECHNOLOGIES INC
Inventor： THOMPSON WILLIAM A
Abstract: A bi-directional optical transmission system according to the present invention provides transport of x optical channels over n nodes. The system supports t wo- way transport of the x channels over a single fiber connecting each of the nodes in sequence. The system is advantageous in that only two optical transmission bands are utilized in order to achieve minimal loss in the separation of bands. The two directions of optical transmission on the fiber between the end nodes have a spectral (wavelength/frequency) separation, in addition to directional separation. The use of only two bands permits the utilization of low-loss wide band thin film optical filters to combine and separate the signals at each node. Further processing of the signals takes place in unidirectional components, e.g., multiplexers, demultiplexers and amplifiers; as required. An alternating arrangement of the optical filters in the two separate bands is chosen to maximize the optical performance of the overall system and significantly reduce insertion losses. In one exemplary embodiment of the present invention, at each intermediate node in the system a transmission filter for the first band of optical signals is used between the output of an optical amplifier for the first band and the bi-directional fibers. A reflection portof this filter is used to carry oppositely directed signals of the second band from the bi- directional fiber to an optical amplifier for the second band. An optical transmission filter for the second optical band is also used at each intermediate node between the output of an optical amplifier for the second band and the bi-directional fiber. The reflection port of the second hand filter is used to carry the input signal of the first band from the bi-directional fibers to the optical amplifier for the first band. End nodes in the system include only an appropriate one of the transmission filters. The alternate arrangement of filters simultaneously provides for optimal signal performanc e for both directions of transmission at every node in the system whine at the same tim e minimizing insertion losses from filtering components.
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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
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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公开(公告)号：DE60100036T2
公开(公告)日：2003-06-18
申请号：DE60100036
申请日：2001-01-15
Applicant: LUCENT TECHNOLOGIES INC
Inventor： THOMPSON WILLIAM A
Abstract: A bi-directional optical transmission system according to the present invention provides transport of x optical channels over n nodes. The system supports two-way transport of the x channels over a single fiber connecting each of the nodes in sequence. The system is advantageous in that only two optical transmission bands are utilized in order to achieve minimal loss in the separation of bands. The two directions of optical transmission on the fiber between the end nodes have a spectral (wavelength/frequency) separation, in addition to directional separation. The use of only two bands permits the utilization of low-loss wide band thin film optical filters to combine and separate the signals at each node. Further processing of the signals takes place in unidirectional components, e.g., multiplexers, demultiplexers and amplifiers, as required. An alternating arrangement of the optical filters in the two separate bands is chosen to maximize the optical performance of the overall system and significantly reduce insertion losses. In one exemplary embodiment of the present invention, at each intermediate node in the system a transmission filter for the first band of optical signals is used between the output of an optical amplifier for the first band and the bi-directional fibers. A reflection port of this filter is used to carry oppositely directed signals of the second band from the bidirectional fiber to an optical amplifier for the second band. An optical transmission filter for the second optical band is also used at each intermediate node between the output of an optical amplifier for the second band and the bi-directional fiber. The reflection port of the second band filter is used to carry the input signal of the first band from the bi-directional fibers to the optical amplifier for the first band. End nodes in the system include only an appropriate one of the transmission filters. The alternate arrangement of filters simultaneously provides for optimal signal performance for both directions of transmission at every node in the system while at the same time minimizing insertion losses from filtering components.
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公开(公告)号：DE60100036D1
公开(公告)日：2002-11-14
申请号：DE60100036
申请日：2001-01-15
Applicant: LUCENT TECHNOLOGIES INC
Inventor： THOMPSON WILLIAM A
Abstract: A bi-directional optical transmission system according to the present invention provides transport of x optical channels over n nodes. The system supports two-way transport of the x channels over a single fiber connecting each of the nodes in sequence. The system is advantageous in that only two optical transmission bands are utilized in order to achieve minimal loss in the separation of bands. The two directions of optical transmission on the fiber between the end nodes have a spectral (wavelength/frequency) separation, in addition to directional separation. The use of only two bands permits the utilization of low-loss wide band thin film optical filters to combine and separate the signals at each node. Further processing of the signals takes place in unidirectional components, e.g., multiplexers, demultiplexers and amplifiers, as required. An alternating arrangement of the optical filters in the two separate bands is chosen to maximize the optical performance of the overall system and significantly reduce insertion losses. In one exemplary embodiment of the present invention, at each intermediate node in the system a transmission filter for the first band of optical signals is used between the output of an optical amplifier for the first band and the bi-directional fibers. A reflection port of this filter is used to carry oppositely directed signals of the second band from the bidirectional fiber to an optical amplifier for the second band. An optical transmission filter for the second optical band is also used at each intermediate node between the output of an optical amplifier for the second band and the bi-directional fiber. The reflection port of the second band filter is used to carry the input signal of the first band from the bi-directional fibers to the optical amplifier for the first band. End nodes in the system include only an appropriate one of the transmission filters. The alternate arrangement of filters simultaneously provides for optimal signal performance for both directions of transmission at every node in the system while at the same time minimizing insertion losses from filtering components.
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