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公开(公告)号：JP2002022983A
公开(公告)日：2002-01-23
申请号：JP2001147159
申请日：2001-05-17
Applicant: LUCENT TECHNOLOGIES INC
Inventor： JORDAN REBECCA , CHRISTIE K MADSEN
Abstract: PROBLEM TO BE SOLVED: To solve such problem that it becomes increasingly difficult to thermally insulate a waveguide and a resonator so as to be able to independently tune respectively if the dimensions of a device become small, although the miniaturization of the device is necessitated in accordance with requirements for an increase of the band width in a tuning type filer. SOLUTION: The tuning type optical all pass filter 20 is provided with a multilayered waveguide structure which is supported by a substrate 21 consisting of a first layer in which a waveguide optical ring resonator 23 is provided, a second layer as a spacer 24 and a third layer in which a curved waveguide 25 is provided. The curved waveguide 26 is optically coupled with the resonator by two separated optical couplers 27A, 27B penetrating the layer of the spacer 24, and is turned by a first phase shifter 28 for controlling the optical path length of the resonator and a second phase shifter 29 which is operated so as to control coupling strength between the waveguide and the resonator in the waveguide.
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公开(公告)号：JP2001305497A
公开(公告)日：2001-10-31
申请号：JP2001019944
申请日：2001-01-29
Applicant: LUCENT TECHNOLOGIES INC
Inventor： LENZ GADI , CHRISTIE K MADSEN
Abstract: PROBLEM TO BE SOLVED: To provide a single stage all-pass optical filter capable of providing an optical pulse train with an adjustable delay. SOLUTION: The all-pass optical filter has an input port 140 for receiving an input optical pulse having a constant repeating rate, and output port 140, an output port 150, a splitter/combiner 145, and a piece of feedback path 145, and this filter is formed so that a certain time delay period with plural frequency dependence is added to the input optical pulse, and is characterized by a time delay spectrum having plural delayed peaks. A heater 185 is formed on the feedback path 145 so as to be used at the time of tuning the time delay spectrum of the filter.
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公开(公告)号：JP2001296207A
公开(公告)日：2001-10-26
申请号：JP2001064305
申请日：2001-03-08
Applicant: LUCENT TECHNOLOGIES INC
Inventor： CHRISTIE K MADSEN
Abstract: PROBLEM TO BE SOLVED: To provide a phase-sensitive detecting device based, on both side bands for measuring polarization mode dispersion(PMD). SOLUTION: This PMD measuring device uses a portion extracted from the tap of the signal experiencing the dispersion (e.g. propagated in a dispersive optical fiber). The measuring device generates the quantity and phase information on the lower side band and the upper side band of each polarized light of the received signal by using a polarized beam separator and a phase-sensitive single side band detecting circuit. The quantity and phase information collected on the single frequency are used for determining the PMD, and it is not required to sweep the central frequency of the received light signal for generating the PMD measured quantity.
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Patent Agency Ranking
公开(公告)号：JP2000244952A
公开(公告)日：2000-09-08
申请号：JP2000040397
申请日：2000-02-18
Applicant: LUCENT TECHNOLOGIES INC
Inventor： CHRISTIE K MADSEN , SOOLE JULIAN BERNARD DONALD
Abstract: PROBLEM TO BE SOLVED: To obtain a blocking switch module of an N×N degree using switching elements based on an MMI requiring only the minimum number of control elements for executing switching operation by forming a sequential series of switches increasing the sizes of optical switches to be connected in each switch. SOLUTION: An optical space switch is a non-blocking optical switch of an N×N degree provided with a series of connected optical switches 91(2×2), 91(3×3),..., 91(N×N) forming a sequential series of switches of sizes to be increased by one unit in each switch. Since the optical switch is non-blocking, all available combinations of transferring input signals to outputs can be obtained by properly setting up these switches. The sizes of switches are increased by one unit in each switch from a switch of a 2×2 degree up to a final switch of an N×N degree.
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5.发明专利
公开(公告)号：JP2000244459A
公开(公告)日：2000-09-08
申请号：JP2000040396
申请日：2000-02-18
Applicant: LUCENT TECHNOLOGIES INC
Inventor： CHRISTIE K MADSEN
Abstract: PROBLEM TO BE SOLVED: To provide an improved junction/branch device by distributing N channels among M routes, filtering M routes through the use of P junction/ branch filters and reconnecting M filtered transmission routes. SOLUTION: This junction/branch device 10 receives an N channel WDM signal from a transmission fiber 9A and a 1xM demultiplexer 11 for distributing N-channels is contained between M routes 12. (M and N are integers, M
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公开(公告)号：JP2001042232A
公开(公告)日：2001-02-16
申请号：JP2000178073
申请日：2000-06-14
Applicant: LUCENT TECHNOLOGIES INC
Inventor： FORD JOSEPH EARL , KEITH WAIN GOOSEN , CHRISTIE K MADSEN , WALKER JAMES ALBERT
Abstract: PROBLEM TO BE SOLVED: To provide a wide optical wavelength (WDM) communication system whose loss is low, whose polarity dependency is low and which realizes compensation over wide band width by providing an adjustable multichannel dispersion compensating fiber whose loss is low, whose polarity dependency is low and which has a function capable of compensating many channels over a wide wavelength range. SOLUTION: This WDM optical fiber communication system 10 is provided with a multiple wavelength light transmitter 11, an optical fiber for transmission 12, and the adjustable multichannel dispersion compensating fiber 13 for compensating the dispersion of the optical fiber 12. The fiber 13 is provided with a variable partial reflector 19, a fixing mirror 29 and an optical cavity 27 arranged on an optical path between the reflector 19 and the mirror 29. On parallel side surface 28 and the mirror 29 regulate the optical cavity having thickness L. The thickness L is selected so that a free spectral range(FSR) may be the integral multiple of space between the optical channels of the system. Thus, many channels are simultaneously compensated.
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公开(公告)号：JP2002040493A
公开(公告)日：2002-02-06
申请号：JP2001124025
申请日：2001-04-23
Applicant: LUCENT TECHNOLOGIES INC
Inventor： CHRISTIE K MADSEN
Abstract: PROBLEM TO BE SOLVED: To provide an improved multichannel filter which has increased channel b andwidth. SOLUTION: An MZI type reconstitutable multichannel filter is provided with increased channel bandwidth by adding an all-pass filter (20) to one or both of MZI arms (11, 12). Consequently, rectangular amplitude response which is close to a phase is obtained.
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公开(公告)号：JP2000236135A
公开(公告)日：2000-08-29
申请号：JP2000033057
申请日：2000-02-10
Applicant: LUCENT TECHNOLOGIES INC
Inventor： CHRISTIE K MADSEN , JULIAN BERNARD DONALD SOULE
IPC: H01S5/0687 , H01S5/40 , H04B10/04 , H04B10/06 , H04B10/14
Abstract: PROBLEM TO BE SOLVED: To easily provide a variable wavelength light source by providing a variable wavelength light source, a multipath Mach-Zehnder interferometer for receiving a signal from the light source and supplying main output and one or more secondary outputs, and a feed back circuit for adjusting the variable wavelength light source. SOLUTION: A light source 9 having a stable wavelength includes at least one variable wavelength light source 10, a multipath Mach-Zehnder interferometer(MMZI) 11, a plurality of photodetectors 12A, 12B for monitoring the output of the interferometer 11, and a feed back circuit 13 for adjusting the operation wavelength of the variable wavelength light source 10. The multipath Mach-Zehnder interferometer 11 includes a pair of multi-mode couplers and a plurality of wave guides having different optical paths between the couplers. The variable wavelength light source 10 is preferably constituted by tunable lasers 10A to 10D. A typical feed back circuit 13 uses two photodiodes 12A, 12B as the front ends of the different trans-impedance amplifiers 21A, 21B.
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