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1.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：JPH10153547A
公开(公告)日：1998-06-09
申请号：JP30491097
申请日：1997-10-20
Applicant: LUCENT TECHNOLOGIES INC
Inventor： JACOBSEN RUNE HYLSBERG , MITTLEMAN DANIEL MATTHEW , NUSS MARTIN C
Abstract: PROBLEM TO BE SOLVED: To display related information in real time by a method wherein the related information in a THz waveform returned from a medium is extracted using a plurality of algorithms and compressed data thereof are displayed as pixel of an image of a T light beam of the medium. SOLUTION: A THz image processor 10 has a femto-second pulse source 12, an image processor 14 and an analysis circuit 18. The femto-second pulse source 12 is a semiconductor laser which has a wavelength in the vicinity of 800nm and a repetition rate of about 100MHz. A THz transmitter 20 of the image processor 14 generates THz light to be radiated to a medium 16 to be inspected and a THz detector 22 detects a waveform transmitted through the medium 16 or reflected thereon. The THz transmitter 20 and the THz detector 22 are optically opened or closed by a beam splitter utilizing an output of the femto second pulse source 12. A variable delay line 26 changes optical delay between gate pluses to obtain a replica of the THz waveform. With such an arrangement, the time distortion of the THz waveform is analyzed to obtain a structural component of an object and information of characteristic in real time.
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公开(公告)号：JPH1090174A
公开(公告)日：1998-04-10
申请号：JP24262697
申请日：1997-09-08
Applicant: LUCENT TECHNOLOGIES INC
Inventor： NUSS MARTIN C
Abstract: PROBLEM TO BE SOLVED: To change an object into an image by using a terahertz (THz) signal by a method wherein a signal source is condensed on every point of the object and the object is scanned simultaneously by the signal source and a detector by using a pattern in a direction orthogonal to a propagation direction. SOLUTION: A THz beam from a transmitter 2 is condensed on a spot, on an object 4, whose diameter is, e.g. 0.3 to 0.5mm and which is diffraction- limited, and the spot is projected on a single THz detector 5. A sample is arranged on the focal plane of the THz beam, and it is scanned in a zigzag pattern in the x-direction and the y-direction by a movement means which is driven by a motor. The delay between the gate pulse of the transmitter 2 and the gate pulse of the detector 5 is scanned continuously by a 10Hz scanning delay line 6, its output is output to an A/D converter and a DSP 7 via the detector 5, and an FFT spectrumin every THz waveform is obtained simultaneously with a 10-Hz scanning rate by a prescribed conversion operation so as to be displayed on a display 8.
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公开(公告)号：JPH09197355A
公开(公告)日：1997-07-31
申请号：JP350797
申请日：1997-01-13
Applicant: LUCENT TECHNOLOGIES INC
Inventor： DAMEN THEODOOR CHARLOUIS , NUSS MARTIN C
Abstract: PROBLEM TO BE SOLVED: To shorten the temporary continuance time of light input pulse by providing a zero dispersion pulse shaper which generates spectrally dispersed pulses and a modulator module which generates selectively attenuated pulses. SOLUTION: As for a modulator array 130 placed in the zero dispersion shaper 100, pixels receiving the power spectrum center part of light input pulses which are spectrally dispersed are so controlled as to assume a finite gray level and pixels receiving the sleeve part of a power spectrum are driven still in a complete transparent state, thereby attenuating the center part of the power spectrum of the spectrally dispersed light input pulses 160. And, the zero dispersion pulse shaper 100 concentrates and recouples the spectrally dispersed light input pulses which are selectively attenuated to generate light output pulses 170 having temporary continuance time shortened as to the light input pulses 160.
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公开(公告)号：JPH11163794A
公开(公告)日：1999-06-18
申请号：JP27070498
申请日：1998-09-25
Applicant: LUCENT TECHNOLOGIES INC
Inventor： BOIVIN LUC , FELDMAN ROBERT D , NUSS MARTIN C
Abstract: PROBLEM TO BE SOLVED: To overcome coherent Rayleigh noise by connecting a cable to a photodetector that has a second bandwidth so that a first bandwidth is wider that the second bandwidth. SOLUTION: A light source 401 which has undergone spectrum slice is connected to a first end part of a first section 407 of an optical fiber cable. A second end part of the section 407 of the optical fiber cable is connected to an input port of a router 409. A first output port of the router 409 is connected to a first end part of a second section 411 of the optical fiber cable. A second output port of the router 409 is connected a first end part of a third section 413 of the optical fiber cable. The cable is connected to a light output source which has first bandwidth and has undergone spectrum slice, and the cable is connected to a photodetector which has second bandwidth so that the first bandwidth is wider that the second bandwidth.
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Patent Agency Ranking
公开(公告)号：JPH11108845A
公开(公告)日：1999-04-23
申请号：JP5717698
申请日：1998-03-09
Applicant: LUCENT TECHNOLOGIES INC
Inventor： NUSS MARTIN C
Abstract: PROBLEM TO BE SOLVED: To obtain information on a resolution and a composition in a depthwise direction of an object to be inspected, by projecting a waveform including electromagnetic radiation pulses in a 10 Hz frequency range and measuring a related delay time of pulses reflected at the object. SOLUTION: Electromagnetic radiation T-ray pulse beams in a T-ray frequency range generated by a tera Hz (T-ray) wave transmitter 103 are reflected at a first reflecting surface 111 and a second reflecting surface 113, brought in an inspection object 107 and reflected. The reflected beams are reflected at a third reflecting surface 109 and received by a T-ray wave detector 105. In this case, a reflection waveform includes a plurality of distorted pulses with time of various amplitudes and polarities because of the reflection at a discontinuous dielectric body in the inspection object 107. An arrival time of each of the plurality of detected reflected pulses is measured at an operation process. A position of an interface of the dielectric body in the inspection object 107 in a propagation direction is determined from related delay times. Information on a resolution, a composition in a depthwise direction of the inspection object 107 is obtained in this manner.
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公开(公告)号：JPH10104171A
公开(公告)日：1998-04-24
申请号：JP24365497
申请日：1997-09-09
Applicant: LUCENT TECHNOLOGIES INC
Inventor： NUSS MARTIN C
IPC: G01D5/26 , G01J3/28 , G01J3/42 , G01N21/35 , G01N22/00 , G01N22/02 , H01Q3/26 , H01Q9/28 , H01S1/02
Abstract: PROBLEM TO BE SOLVED: To obtain the parallel beams without curving of the wave front by providing an optical element for collimating the emitted radiation within a specified frequency range into a beam with diameter independent of the frequency and has no curving of the wave front, a beam detector and the like. SOLUTION: An imaging device 12 comprises a light emitting source of repeating optical pulses for a specified time length, an optical-element arrangement, which forms the radiation wave of THZ(tera hearz) and detects the reflected radiation wave transmitted through the medium of an object 16 or reflected by this medium, and an analyzing circuit 18. The optical-element arrangement 10 comprises a THZ wave transmitter 20, whose gate is optically controlled, and a THZ wave detector 22. A variable optical delay circuit 26 changes the optical delay between respective processing pulses controlled by a computer 27. A dipole antenna is used for constructing both of the THZ wave transmitter 20 and the THZ wave detector 22. A substrate lens advances the coupling into the free space and the collimating process of the electromagnetic radiation wave.
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公开(公告)号：DE69833913T2
公开(公告)日：2006-11-23
申请号：DE69833913
申请日：1998-09-15
Applicant: LUCENT TECHNOLOGIES INC
Inventor： BOIVIN LUC , NUSS MARTIN C , FELDMAN ROBERT D
Abstract: Low-noise, bidirectional communications in a fiber optic cable is achieved by coupling a first end of the cable to a spectrally-sliced optical power source. A second end of the cable is coupled to an optical detector having a detector bandwidth, such that the bandwidth of the optical power source is greater than the detector bandwidth. When the bandwidth of the optical power source is large compared to the bandwidth of the detector, the beat frequencies resulting from coherent Rayleigh noise fall outside the bandwidth of the detector and are not detected.
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公开(公告)号：DE69833913D1
公开(公告)日：2006-05-11
申请号：DE69833913
申请日：1998-09-15
Applicant: LUCENT TECHNOLOGIES INC
Inventor： BOIVIN LUC , NUSS MARTIN C , FELDMAN ROBERT D
Abstract: Low-noise, bidirectional communications in a fiber optic cable is achieved by coupling a first end of the cable to a spectrally-sliced optical power source. A second end of the cable is coupled to an optical detector having a detector bandwidth, such that the bandwidth of the optical power source is greater than the detector bandwidth. When the bandwidth of the optical power source is large compared to the bandwidth of the detector, the beat frequencies resulting from coherent Rayleigh noise fall outside the bandwidth of the detector and are not detected.
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公开(公告)号：CA2247610C
公开(公告)日：2003-04-15
申请号：CA2247610
申请日：1998-09-17
Applicant: LUCENT TECHNOLOGIES INC
Inventor： BOIVIN LUC , FELDMAN ROBERT D , NUSS MARTIN C
Abstract: Low-noise, bidirectional communications in a fiber optic cable is achieved by coupling a first end of the cable to a spectrally-sliced optical power source. A second end of the cable is coupled to an optical detector having a detector bandwidth, such that the bandwidth of the optical power source is greater than the detector bandwidth. When the bandwidth of the optical power source is large compared to the bandwidth of the detector, the beat frequencies resulting from coherent Rayleigh noise fall outside the bandwidth of the detector and are not detected.
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