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公开(公告)号：JP2000059316A
公开(公告)日：2000-02-25
申请号：JP19132799
申请日：1999-07-06
Applicant: LUCENT TECHNOLOGIES INC
Inventor： OTA YUSUKE , EDERD SACKINGER
Abstract: PROBLEM TO BE SOLVED: To provide a circuit and a method to control power of a laser. SOLUTION: The power of a laser can be controlled by (1) storage of a current generated by a photodiode 117 in response to an optical signal generated by the laser, (2) subtraction of a preset threshold current in response to a data signal used to drive the laser from the current, (3) comparison of the prescribed storage with the prescribed subtraction before starting the storage and the subtraction. A driver 119 of the laser is controlled by using the result of this comparison (filter processing may be executed).
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公开(公告)号：JP2000200942A
公开(公告)日：2000-07-18
申请号：JP19132699
申请日：1999-07-06
Applicant: LUCENT TECHNOLOGIES INC
Inventor： OTA YUSUKE , EDERD SACKINGER
IPC: H01S5/0683 , H01S5/068 , H04B10/04 , H04B10/06 , H04B10/08 , H04B10/14 , H04B10/158
Abstract: PROBLEM TO BE SOLVED: To enable control of a laser and detection of a service life of a laser in a burst signal format by setting a first threshold at a value for executing power control and a second threshold at a value for detecting the service life of a laser. SOLUTION: A threshold depends on desired operation to be executed, when a corresponding threshold source is selected. For example, when it is used for controlling the power of a threshold source 107-1, the threshold source 107-1 is set at a current level generated by an optical diode 117, when a laser 115 supplies a desired power level. Similarly, when it is used for executing detection of a service life, a threshold source 107-2 is set at a current level generated by the optical diode 117, when the laser 115 attains near a final period of an effective life designated by a user. Another threshold source 107-N is used, for example, for issuing an alarm on laser service life at an early stage to a user.
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