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公开(公告)号：JPH11195844A
公开(公告)日：1999-07-21
申请号：JP29795498
申请日：1998-10-20
Applicant: LUCENT TECHNOLOGIES INC
Inventor： ADAMS LAURA ELLEN , BETHEA CLYDE GEORGE , NYKOLAK GERALD , PEOPLE ROOSEVELT , TANBUN-EK TAWEE
IPC: H04B10/02 , H01S5/00 , H01S5/02 , H01S5/026 , H01S5/06 , H01S5/0625 , H01S5/12 , H01S5/125 , H04B10/155 , H04B10/18 , H01S3/18
Abstract: PROBLEM TO BE SOLVED: To reduce signal distortion caused by fiber nonlinearity and dispersion by comprising a semiconductor laser which allows broad band tuning, comprising an integrated internal void synthesis reflector, and adding a tuning voltage and pre-chirp. SOLUTION: A semiconductor laser 10 which allows broad band tuning comprises a gain section 12 and an internal void synthesis reflector section 14 integrated with it, and a current is supplied to the gain section 12 by a current driver 16 for generating an output signal. A DC voltage applied to the synthesis reflector section 14 by a bias source 18 is used for rough-tuning the carrier frequency of the output signal through control of phase of optical field of the void in laser, in addition, output signal is connected to a fiber with a tendency wherein the signal is internally subjected to distortion caused by non-linearity and dispersion. Further, the reflector section 14 is supplied with a pre-chirp signal of relatively low frequency and low voltage, generating relatively small wavelength deviation around a carrier frequency.
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公开(公告)号：JPH11191649A
公开(公告)日：1999-07-13
申请号：JP29666498
申请日：1998-10-19
Applicant: LUCENT TECHNOLOGIES INC
Inventor： ADAMS LAURA ELLEN , BETHEA CLYDE GEORGE , FANG WEI-CHIAO , NYKOLAK GERALD , PEOPLE ROOSEVELT , SERGENT ARTHUR M , TANBUN-EK TAWEE , TSANG WON-TIEN
IPC: H01S3/10 , H01S5/0625 , H01S5/10
Abstract: PROBLEM TO BE SOLVED: To provide a broad band adjustable laser, which generates optical output signal corresponding such as to the wavelength of a wavelength division multiplexing (WDM) system, N-pieces of channels, with any one of the N-pieces of different axial modes. SOLUTION: An adjustable semiconductor laser has a gain region 12 having an MGW active region 12.1, grating DFB regions 12.2 of a uniform pitch and a first waveguide 12.3. A cavity resonance is formed of a composite reflecting region 14, which has a second MQW region 14.1 and a second waveguide 14.3, and the regions 12.2. Due to the voltage applied to this region 14, a quantum confining Stark effect is caused and as a result, the wavelength of the laser is changed.
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公开(公告)号：JP2000299491A
公开(公告)日：2000-10-24
申请号：JP2000083096
申请日：2000-03-24
Applicant: LUCENT TECHNOLOGIES INC
Inventor： NYKOLAK GERALD , PRESBY HERMAN MELVIN , SZAJOWSKI PAUL F
IPC: H01L31/0232 , H01L31/12 , H01L33/00 , H04B10/10 , H04B10/118 , H04B10/22 , H04B10/105
Abstract: PROBLEM TO BE SOLVED: To reduce or remove the scintillation effect when an electromagnetic signal incident on a Fresnel lens is propagated by combining a Fresnel lens having sufficient aperture and a sloped concentrator, and then setting the focal point of the Fresnel lens with the sloped concentrator to adequately allocate the focal point on the detector. SOLUTION: An optical receiving system 40 includes a Fresnel lens 16 that is optically coupled with a detector 32 via a sloped concentrator 50. The Fresnel lens 16 is suitable for reception of an electromagnetic signal 14 and has the Fresnel focal point 30. The sloped concentrator 50 has a first end surface area 22 that is larger than the second end surface area 26. The detector 32 has a detection surface area 34 in the direction to receive the electromagnetic signal 14 from the sloped concentrator 50. The Fresnel lens 16 has an aperture that is sufficient to shield the adequate surface area of the electromagnetic field of the electromagnetic signal 14 in order to reduce the scintillation of electromagnetic field received. As a result, the electromagnetic signal 14 can be received almost in the whole area of the surface area.
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公开(公告)号：JPH1062826A
公开(公告)日：1998-03-06
申请号：JP15206697
申请日：1997-06-10
Applicant: LUCENT TECHNOLOGIES INC
Inventor： BARROS MIRIAM R DE , ESKILDSEN LARS ERIK , NYKOLAK GERALD , VENGSARKAR ASHISH MADHUKAR , NIELSEN TORBEN N , TANBUN-EK TAWEE
Abstract: PROBLEM TO BE SOLVED: To obtain an optical router which is easily producible from a not costly optical fiber element and does not require an optical device or integrated optical element of a bulk type by constituting the optical router of an electronic element (phase controller), a directional coupler made of a fiber, a reflection grating filter made of a fiber, a tap made of a fiber and a phase modulator made of a fiber. SOLUTION: An input wavelength is equally divided to a port 2 and a port 3 by the coupler 10. The phase modulator 12 imparts a small dither signal to the phase of the light from the port 3. A reflector 11A and a reflector 11B returns the one wavelength to the coupler 10 while matching. Both of the two reflected optical powers interfere with each other in the coupler 10 based on their overall phase. The tap 13 samples the interference of the reflected light power and the dither signal. The tap 13 applies the samples of the interference signal and the dither signal to the controller 14. The controller 14 analyzes the dither signal and forms a compensation voltage in the phase modulator 12.
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公开(公告)号：JPH11243255A
公开(公告)日：1999-09-07
申请号：JP29795298
申请日：1998-10-20
Applicant: LUCENT TECHNOLOGIES INC
Inventor： ADAMS LAURA ELLEN , BETHEA CLYDE GEORGE , NYKOLAK GERALD , PEOPLE ROOSEVELT , TANBUN-EK TAWEE
IPC: H04J14/00 , H01S5/00 , H01S5/02 , H01S5/026 , H01S5/06 , H01S5/0625 , H01S5/12 , H01S5/50 , H04B10/04 , H04B10/06 , H04B10/142 , H04B10/152 , H04J7/00 , H04J14/02
Abstract: PROBLEM TO BE SOLVED: To provide a wide-band, tunable semiconductor laser transmitter capable of realizing multiplexing of subcarriers. SOLUTION: A laser transmitter 10 makes routing a signal with three hierarchical levels. The signal route is discriminated on the basis of N number of wavelength division multiplexed(WDM) wavelength channels at a first level, m amplitude modulation(AM) subcarrier frequency channels at a second level, and n frequency modulation(FM) subcarrier frequency channels at a third level. Since an adjustment voltage is used to roughly adjust the wavelengths of N number of WDM channels, an FM dither signal is used to generate additional m number of channels via FM-SCM (subcarrier multiplexing). An AM dither signal is similarly used to generate additional n number of channels via AM- SCM.
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Patent Agency Ranking
公开(公告)号：JPH11225112A
公开(公告)日：1999-08-17
申请号：JP31198098
申请日：1998-11-02
Applicant: LUCENT TECHNOLOGIES INC
Inventor： ADAMS LAURA ELLEN , CHEN YOUNG-KAI , NYKOLAK GERALD
Abstract: PROBLEM TO BE SOLVED: To correct nonlinearity of a signal sent through an optical fiber in response to a change in a transmission condition and a change in an optical path. SOLUTION: This system 100 uses a signal bed back from a receiver 104 to generate a spectrum profile of an incident pulse matching it so as to minimize distortion of a received pulse. Since feedback control is used to make adaptive to a change in a transmission condition in a fiber path. In the case that a pulse train is sent and looped back via a network, adaptive processing is conducted for a training session of a data frame. After the training is finished, a loop back path is interrupted and pre-distortion is applied to the sent pulse and data transmission starts.
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公开(公告)号：JPH11195843A
公开(公告)日：1999-07-21
申请号：JP29795398
申请日：1998-10-20
Applicant: LUCENT TECHNOLOGIES INC
Inventor： ADAMS LAURA ELLEN , BETHEA CLYDE GEORGE , ESKILDSEN LARS ERIK , NYKOLAK GERALD , PEOPLE ROOSEVELT , TANBUN-EK TAWEE
IPC: H04B10/02 , H01S5/00 , H01S5/042 , H01S5/062 , H01S5/0625 , H01S5/125 , H04B10/18 , H04B10/43 , H01S3/18 , H04B10/28
Abstract: PROBLEM TO BE SOLVED: To reduce stimulus Brillouin scattering by, related to an optical fiber system, comprising an integral internal void synthesis reflector, to which tuning voltage and dither signal are added for tuning in broad band. SOLUTION: A semiconductor laser 10 which allows broad band tuning comprises a gain section 12 and an internal void synthesis reflector section 14, and a current driver 16 supplies a current to the gain section 12 for generating an output signal 20. A forward bias DC voltage is supplied to the synthesis reflector section 14 from a bias source 18 for controlling a phase of an optical field in the void inside laser, thus carrier frequency of an output signal is roughly adjusted. Further, the output signal is combined to a transfer medium having tendency to generating stimulus Brillouin scattering(SBS). In order for reducing the SBS, a dither signal of relatively low frequency and low voltage is further added to the synthesis reflector section 14. The spectrum of the output signal is widened for increased SBS threshold.
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公开(公告)号：DE69810732T2
公开(公告)日：2003-09-11
申请号：DE69810732
申请日：1998-10-13
Applicant: LUCENT TECHNOLOGIES INC
Inventor： ADAMS LAURA ELLEN , BETHEA CLYDE GEORGE , NYKOLAK GERALD , PEOPLE ROOSEVELT , TANBUN-EK TAWEE
IPC: H04J14/00 , H01S5/00 , H01S5/02 , H01S5/026 , H01S5/06 , H01S5/0625 , H01S5/12 , H01S5/50 , H04B10/04 , H04B10/06 , H04B10/142 , H04B10/152 , H04J7/00 , H04J14/02 , H04J14/04
Abstract: In a WDM fiber-optic network, a unique laser transmitter enables signals to be routed at three hierarchical levels: at one level discrimination among signal paths is based on N WDM wavelength channels, at another level discrimination is based on m AM subcarrier frequency channels, and at a third level discrimination is based on n FM subcarrier frequency channels. Thus, a total of Nmn distinguishable optical channels can be accommodated and a like number of users served. The laser transmitter comprises a broadband, tunable semiconductor laser which includes an intracavity, integrated composite reflector to which a tuning voltage and a FM dither signal are applied, an intracavity gain section to which drive current is applied, and an extracavity, integrated electroabsorption modulator to which an information (e.g., data, voice, video) signal and an AM dither signal are applied. The tuning voltage provides coarse wavelength tuning among N WDM channels, whereas the FM dither signal produces an additional m channels via FM-SCM. The AM dither likewise produces an additional n channels via AM-SCM.
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公开(公告)号：CA2300353A1
公开(公告)日：2000-09-25
申请号：CA2300353
申请日：2000-03-10
Applicant: LUCENT TECHNOLOGIES INC
Inventor： SZAJOWSKI PAUL F , NYKOLAK GERALD , PRESBY HERMAN MELVIN
IPC: H01L31/0232 , H01L31/12 , H01L33/00 , H04B10/10 , H04B10/118 , H04B10/22 , H04B10/06
Abstract: An optical receiving system includes a Fresnel lens optically coupled to a detector via a tapered concentrator. The Fresnel lens is adapted to receive an electromagnetic signal and has a Fresnel focal point. The tapered concentrator has a first end surface area larger than a second end surface area. The detector has a sensing surface area oriented to receive the electromagnetic signal emerging from the tapered concentrator.
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公开(公告)号：DE69739983D1
公开(公告)日：2010-10-21
申请号：DE69739983
申请日：1997-06-09
Applicant: LUCENT TECHNOLOGIES INC
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