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公开(公告)号：JP2001196688A
公开(公告)日：2001-07-19
申请号：JP2000396401
申请日：2000-12-27
Applicant: LUCENT TECHNOLOGIES INC
Inventor： ACKERMAN DAVID ALAN , BROUTIN SCOTT L , PLOURDE JAMES KEVIN , STAYT JOHN W JR
IPC: H01S5/0687 , H01S5/06 , H01S5/0625
Abstract: PROBLEM TO BE SOLVED: To provide a method and, a device for selecting an optimum operation state in a digital wavelength stabilization control system. SOLUTION: In this method, the value of a tuning current supplied to a multi-channel laser source is controlled. For each operation laser channel, the desired inclination of the laser source is stored as the function of the tuning current. Then, the inclination of the laser source is measured as the function of the tuning current. After that, the tuning current is adjusted until an inclination being essentially close to the desired one is measured. An operation tuning current to the laser source is set to a value corresponding to the measured inclination.
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公开(公告)号：JP2000353841A
公开(公告)日：2000-12-19
申请号：JP2000123009
申请日：2000-04-24
Applicant: LUCENT TECHNOLOGIES INC
Inventor： ACKERMAN DAVID ALAN , BERGER MATTHIAS , ZHOU JIANHUI
IPC: G02F1/03 , H01S3/06 , H01S3/10 , H01S5/026 , H01S5/0687 , H04B10/00 , H04B10/02 , H04B10/04 , H04B10/06 , H04B10/079 , H04B10/08 , H04B10/14 , H04B10/17 , H04B10/29 , H04B10/293 , H04J14/00 , H04J14/02 , H04B10/16
Abstract: PROBLEM TO BE SOLVED: To control frequency and output power independently by keeping the sum of the power level of an amplitude adjusted pilot tone signal and the power level of a received WDM optical signal constant independent of the number and amplitude of a wavelength included in the received WDM optical signal. SOLUTION: An input optical signal including a received WDM(wavelength division multiplex) optical signal and an amplitude adjusted optical pilot tone signal having a wavelength located outside the WDM signal is amplified. A wavelength stabilized laser 503 optical signal for use as a pilot tone signal is generated. The power level of a signal to be inputted to an optical amplifier 506 is compared with a reference signal and a control signal is generated. The amplitude of the received pilot signal is adjusted so that the sum of the power level thereof and the power level of the received WDM signal remains constant independent of the number and amplitude of the at least one wavelength included in the received WDM signal.
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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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4.发明专利
公开(公告)号：JP2001036190A
公开(公告)日：2001-02-09
申请号：JP2000173064
申请日：2000-06-09
Applicant: LUCENT TECHNOLOGIES INC
Inventor： ACKERMAN DAVID ALAN
IPC: H01S5/06 , H01S5/0687 , H01S5/125 , H04B10/04 , H04B10/06 , H04B10/14 , H04B10/155 , H04B10/26 , H04B10/43 , H04J14/00 , H04J14/02 , H04B10/28
Abstract: PROBLEM TO BE SOLVED: To control an adjustable optical transmitter to operate without causing mode hoppings and at the same time, to maintain the side mode suppression ratio of the transmitter as high as possible, by supplying a tuned current of a level at which the side mode suppression ratio becomes the maximum to a laser with respect to each channel wavelength by means of a controller. SOLUTION: An analog approach is constituted of a combination of a phase sensitive detector(PSD) 20 and a dither source 28, and the primary derivative with respect to the tuned current of the output current of a distributed Bragg reflector(DBR) semiconductor laser 12 is generated. When a lock-in amplifier is used as the PSD 20, an in-phase lock-in signal generated by the amplifier becomes proportional to the primary differential coefficient. The derivative is used for controlling the operation of the laser 12. Namely, the laser 12 is constituted to operate at the maximum side mode suppression ratio(SMSR), regardless of to which channel the laser 12 is designated for providing a carrier signal.
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公开(公告)号：CA2310443A1
公开(公告)日：2000-12-11
申请号：CA2310443
申请日：2000-06-01
Applicant: LUCENT TECHNOLOGIES INC
Inventor： ACKERMAN DAVID ALAN
IPC: H01S5/06 , H01S5/0687 , H01S5/125 , H04B10/04 , H04B10/06 , H04B10/14 , H04B10/155 , H04B10/26 , H04B10/43 , H04J14/00 , H04J14/02
Abstract: In practical WDM systems, the maximum SMSR for each channel does not necessarily occur where dP out/dI tun = 0. In fact, for most channels the maximum SMSR occurs at values of tuning current where this first derivative in not zero. In accordance with one aspect of the invention, a wavelength stabilized optical transmitter includes a DBR laser and a feedback loop for controlling the center wavelength of the laser, characterized in that the transmitter also includes a memory in which are stored the non-zero values of dP out/dI tune where the SMSR is a maximum for each of a multiplicity of different channel wavelengths and further includes a controller responsive to the stored values for delivering to the laser a level of tuning current that maximizes the SMSR for a particular channel wavelength.
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Patent Agency Ranking
公开(公告)号：CA2335166C
公开(公告)日：2005-01-11
申请号：CA2335166
申请日：2001-02-09
Applicant: LUCENT TECHNOLOGIES INC
Inventor： ACKERMAN DAVID ALAN , ROTTWITT KARSTEN , STENTZ ANDREW JOHN , STRASSER THOMAS ANDREW , ZHANG LIMING , DU MEI , BACHER KENNETH L , DAUTREMONT-SMITH WILLIAM CROSS
Abstract: A fiber Raman amplifier is configured to use a co-propagating Raman pum p source, which may be beneficial in a variety of system configurations (for example, in bidirectional communication systems). By carefully configuring the pump sour ce characteristics, sufficient optical gain can be achieved in the co-propagati ng arrangement, the characteristics including: (1) using an optical pump power of at least 50mW, (2) having a relatively large spectral bandwidth within the pump (to suppress SBS); and (3) a frequency difference between all longitudinal pump modes of each pump laser being separated by at least the walk-off frequency between the pu mp laser frequency and the signal frequency, and all intense longitudinal modes betwe en different pump lasers being separated by at least the electrical bandwidth o f the communication system.
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公开(公告)号：CA2310443C
公开(公告)日：2004-03-30
申请号：CA2310443
申请日：2000-06-01
Applicant: LUCENT TECHNOLOGIES INC
Inventor： ACKERMAN DAVID ALAN
IPC: H01S5/06 , H01S5/0687 , H01S5/125 , H04B10/04 , H04B10/06 , H04B10/14 , H04B10/155 , H04B10/26 , H04B10/43 , H04J14/00 , H04J14/02
Abstract: In practical WDM systems, the maximum SMSR for each channel does not necessarily occur where dP out/dI tun = 0. In fact, for most channels the maximum SMSR occurs at values of tuning current where this first derivative in not zero. In accordance with one aspect of the invention, a wavelength stabilized optical transmitte r includes a DBR laser and a feedback loop for controlling the center wavelength of the laser, characterized in that the transmitter also includes a memory in which are stored the non- zero values of dP out/dI tune where the SMSR is a maximum for each of a multiplicity of different channel wavelengths and further includes a controller responsive t o the stored values for delivering to the laser a level of tuning current that maximizes the SMSR for a particular channel wavelength.
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公开(公告)号：CA2336492A1
公开(公告)日：2001-09-15
申请号：CA2336492
申请日：2001-03-01
Applicant: LUCENT TECHNOLOGIES INC
Inventor： SCHNEEMEYER LYNN FRANCES , HARTMAN ROBERT LOUIS , BYLSMA RICHARD BENDICKS , ACKERMAN DAVID ALAN , LINES MALCOLM ELLIS , KOCH THOMAS LAWSON , KOWACH GLEN ROBERT
IPC: G02B6/12 , G02B1/02 , G02B5/28 , G02B6/34 , G02B6/42 , G02B7/00 , G02B26/00 , G02F1/01 , G02F1/21 , H01S5/068 , H01S5/125 , G02F1/00 , H04J14/02 , G02F1/29
Abstract: The thermo-optic behavior of an optical path over a range of temperatures .DELTA.T is controlled by determining a figure-of merit (FOM) for the optical path and including in the path a body of crystalline material that enables the conditions specified by the FO M to be satisfied. The crystalline material is highly transparent at a wavelength .lambda. of radiation propagating in the path, and it has a coefficient of thermal expansion (CTE) and a refractive index n such that the CTE and dn/dT are mutually adapted to satisfy the FOM over the range .DELTA.T. In on e embodiment, the CTE and dn/dT of an etalon compensate one another so as to perform frequency discrimination that is essentially temperature insensitive over the range .DELTA.T. In a preferred embodiment of the optical etalon the crystalline material comprises LiCaAlF6.
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公开(公告)号：DE60133960D1
公开(公告)日：2008-06-26
申请号：DE60133960
申请日：2001-02-19
Applicant: LUCENT TECHNOLOGIES INC
Inventor： ACKERMAN DAVID ALAN , BACHER KENNETH L , DAUTREMONT-SMITH WILLIAM , DU MEI , ROTTWITT KARSTEN , STENTZ ANDREW JOHN , STRASSER THOMAS ANDREW , ZHANG LIMING
Abstract: A fiber Raman amplifier is configured to use a co-propagating Raman pump source, which may be beneficial in a variety of system configurations (for example, in bidirectional communication systems). By carefully configuring the pump source characteristics, sufficient optical gain can be achieved in the co-propagating arrangement, the characteristics including: (1) using an optical pump power of at least 50mW, (2) having a relatively large spectral bandwidth within the pump (to suppress SBS); and (3) a frequency difference between all longitudinal pump modes of each pump laser being separated by at least the walk-off frequency between the pump laser frequency and the signal frequency, and all intense longitudinal modes between different pump lasers being separated by at least the electrical bandwidth of the communication system.
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公开(公告)号：CA2335166A1
公开(公告)日：2001-09-03
申请号：CA2335166
申请日：2001-02-09
Applicant: LUCENT TECHNOLOGIES INC
Inventor： ZHANG LIMING , STRASSER THOMAS ANDREW , DU MEI , ACKERMAN DAVID ALAN , STENTZ ANDREW JOHN , ROTTWITT KARSTEN , BACHER KENNETH L , DAUTREMONT-SMITH WILLIAM CROSS
Abstract: A fiber Raman amplifier is configured to use a co-propagating Raman pum p source, which may be beneficial in a variety of system configurations (for example, in bidirectional communication systems). By carefully configuring the pump sour ce characteristics, sufficient optical gain can be achieved in the co-propagati ng arrangement, the characteristics including: (1) using an optical pump power of at least 50mW, (2) having a relatively large spectral bandwidth within the pump (to suppress SBS); and (3) a frequency difference between all longitudinal pump modes of each pump laser being separated by at least the walk-off frequency between the pu mp laser frequency and the signal frequency, and all intense longitudinal modes betwe en different pump lasers being separated by at least the electrical bandwidth o f the communication system.
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