公开(公告)号：CA2330205A1

公开(公告)日：2001-07-11

申请号：CA2330205

申请日：2001-01-03

Applicant: LUCENT TECHNOLOGIES INC

Inventor： MAK ERIC S ,  STAYT JOHN WILLIAM JR ,  KOCH THOMAS LAWSON ,  OGAWA KINICHIRO

IPC: H01S5/022 ,  H01S5/024 ,  H01S5/06 ,  H01S5/0683 ,  H01S5/0687 ,  H01S3/10

Abstract: A method and apparatus are provided for separating the memory and control functions in a wavelength stabilized laser control system. A laser chip and a memory device are provided in a separate package from the laser control system that can be easily removed when the laser chip requires replacement. The memory device stores the necessary operating data for its associated laser chip and provides the control system any necessary calibration and operating data so the control system can easily and quickly update operation for the new laser chip.

公开(公告)号：CA2327981A1

公开(公告)日：2001-06-30

申请号：CA2327981

申请日：2000-12-08

Applicant: LUCENT TECHNOLOGIES INC

Inventor： ACKERMAN DAVID ALAN ,  STAYT JOHN WILLIAM JR ,  PLOURDE JAMES KEVIN ,  BROUTIN SCOTT L

IPC: H01S5/0687 ,  H01S5/06 ,  H01S5/0625 ,  H01S5/40

Abstract: A method for controlling tuning current values provided to a multichann el laser source. For each operating laser channel, a desired slope value of las er power as a function of tuning current is stored. The slope values of laser power as a function of tuning current is then measured. The tuning current is then adjusted until a slope value substantially close to said desired slope value is measured. The operating tuning current is set for the laser source that corresponds to the measured slope value.

公开(公告)号：CA2313839A1

公开(公告)日：2001-01-27

申请号：CA2313839

申请日：2000-07-13

Applicant: LUCENT TECHNOLOGIES INC

Inventor： BROUTIN SCOTT L ,  DAUTARTAS MINDAUGAS FERNAND ,  STAYT JOHN WILLIAM JR

IPC: G06Q50/00 ,  G06F1/00 ,  G06F11/34 ,  G06F21/10 ,  G06F17/60 ,  G06F11/30 ,  G06F12/14

Abstract: Monitoring clock ticks of a CPU ("computer processing unit") during its execution of a software program is provided. The clock ticks are monitored, and an elapsed runtime is updated, throughout execution of the program on a periodi c basis. The elapsed runtime is stored in a hidden file or within a key inside a software registry. Updating runtime on a periodic basis ensures accurate tracking of runtime usage even in the event of a program crash, allowing the user to restart the program witho ut the penalty of lost runtime. The software package will continue to operate until the elapsed runtime exceeds a predetermined evaluation time, at which point the software package is fully or partially disabled until it is registered by the user. An alternative to the hidden tracking file or registry is to use a World Wide Web push/pull technology to store runtime information at the software provider's site, allowing the provider to modify the evaluation period on a pay-per-use basis.

公开(公告)号：CA2313610A1

公开(公告)日：2001-01-13

申请号：CA2313610

申请日：2000-07-05

Applicant: LUCENT TECHNOLOGIES INC

Inventor： PLOURDE JAMES KEVIN ,  BROUTIN SCOTT L ,  STAYT JOHN WILLIAM JR

IPC: H01S5/00 ,  H01S5/024 ,  H01S5/06 ,  H01S5/068 ,  H01S5/0683 ,  H01S5/0687 ,  H01S3/106

Abstract: A unique method and apparatus for locking on an absolute wavelength of las er light output by a laser package by actively compensating for a change in the temperature of an etalon optical fitter is disclosed. Changes in etalon response characteristics due to temperature changes are compensated for by the addition (or subtraction) of an output voltage offset to the voltage control signal sent to the Thermo-Electric Cooler (TEC) from a controller within the laser package. The voltage offset is calculated by monitoring the etalon temperature. The voltage offset value provides for active compensation of changes in the etalon temperature and effectively "readjusts " the output of the laser as if the etalon temperature itself had been readjusted.

公开(公告)号：CA2327715A1

公开(公告)日：2001-06-16

申请号：CA2327715

申请日：2000-12-06

Applicant: LUCENT TECHNOLOGIES INC

Inventor： SNYDER DAVID ALAN ,  STAYT JOHN WILLIAM JR

IPC: H01S5/022 ,  H01S5/024 ,  H01S5/06 ,  H01S5/0687 ,  H01S3/13

Abstract: A unique method and apparatus for the determination of the wavelength of a laser output in a multi- or stepped-etalon laser wavelength stabilization system i s disclosed. Determination of the laser frequency is based on signals from each etalon pa th in the system, thereby compensating for subsequent changes in the optical characteristics of the etalons caused by varying temperatures. A corrective offset for the measured frequency of the laser output is determined based on values measured by each etalon and values previously stored in a look-up table. The frequency measurement is then adjusted by the determined offset to provide a more accurate determination of the laser frequency.

公开(公告)号：CA2327778A1

公开(公告)日：2001-06-15

申请号：CA2327778

申请日：2000-12-07

Applicant: LUCENT TECHNOLOGIES INC

Inventor： STAYT JOHN WILLIAM JR ,  HARTMAN ROBERT LOUIS ,  BROUTIN SCOTT L ,  O'BRIEN STEPHEN

IPC: H01S5/0687 ,  H04B10/50 ,  H04B10/572 ,  H04J14/00 ,  H04J14/02 ,  H04B10/08

Abstract: A laser module, disposed within a wavelength stabilized control system, is provided with an integral modulator and optical amplifier. The laser module has a first output connected to an optical link and a second output connected to a controller via a signal discriminator circuit. The controller controls a channel selection process for the system. During the channel selection process, the controller adjusts a gain section, the modulator and amplifier as necessary to reduce the transmission power of the first and second outputs so that the first output can not be detected by a receiver connected to the link. The controller initiates the channel selection process by adjusting th e laser module and monitoring etalon characteristics of the second output. By tracking the etalon characteristics, the controller can determine when a wavelength of a desired channel has been obtained. Once the wavelength has been obtained it is locked and stabilized. Subsequently, the controller adjusts the gain section, modulator and amplifi er to obtain transmission power for the first and second outputs allowing the first outpu t to be detected by a receiver connected to the link. This way, a channel selection process can be performed without turning off the laser module, or its outputs, and witho ut corrupting any data on the optical link.