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US 7,065,111 B2Granted
Method for testing laser using side mode suppression ratio
AssigneeFinisar Corporation
InventorCharles W. Miller
Life of this patent
Estimating the term…
Abstract
Systems, methods and computer software are provided for testing a laser. Initially, the laser is operated at a first bias setting and a data rate of about 10 Gb/s, and a first side mode suppression ratio of the laser output is measured that is based on a first ratio of a highest and next highest optical power peaks as a function of a first wavelength. Next, the laser is operated at a second bias setting and a data rate of about 10 Gb/s, and a second side mode suppression ratio of the laser output is measured that is based on a second ratio of a highest and next highest optical power peaks as a function of a second wavelength. A test result for the laser is then generated in accordance with a difference between the first and second side mode suppression ratios.
Claims45
A method for testing a laser, comprising:
- operating the laser at a first bias setting, the laser having a data rate at the first bias setting of about 10 Gb/s;
- measuring a first side mode suppression ratio of the laser output based on a first ratio of highest and next highest optical power peaks as a function of a first wavelength while operating the laser at the first bias setting and at a data rate of about 10 Gb/s;
- operating the laser at a second bias setting, the laser having a data rate at the second bias setting of about 10 Gb/s;
- measuring a second side mode suppression ratio of the laser output based on a second ratio of highest and next highest optical power peaks as a function of a second wavelength while operating the laser at the second bias setting and at a data rate of about 10 Gb/s;
- and
- generating a test result for the laser in accordance with a difference between the first and second side mode suppression ratios.
3 more elements
A method for testing a laser, comprising:
- operating the laser at a first bias setting;
- measuring a first side mode suppression ratio of the laser output based on a first ratio of highest and next highest optical power peaks as a function of a first wavelength while operating the laser at the first bias setting;
- operating the laser at a second bias setting;
- measuring a second side mode suppression ratio of the laser output based on a second ratio of highest and next highest optical power peaks as a function of a second wavelength while operating the laser at the second bias setting;
- correlating a difference between the first and second side mode suppression ratios with a measured bit error rate;
- and
- determining a value of an operational parameter for the laser based upon the correlation between the suppression ratio difference and measured bit error rate.
4 more elements
A computer program product for implementing a method for testing a laser, the computer program product comprising:
- a computer readable medium carrying computer executable instructions for performing the method, wherein the method comprises:
- causing operation of the laser at a first bias setting, the laser having a data rate at the first bias setting of about 10 Gb/s;
- measuring a first side mode suppression ratio of a laser output based on a first ratio of highest and next highest optical power peaks as a function of a first wavelength while operating the laser at the first bias setting and at a data rate of about 10 Gb/s;
- causing operation of the laser at a second bias setting, the laser having a data rate at the second bias setting of about 10 Gb/s;
- measuring a second side mode suppression ratio of a laser output based on a second ratio of highest and next highest optical power peaks as a function of a second wavelength while operating the laser at the second bias setting and at a data rate of about 10 Gb/s;
- and
- generating a test result for the laser in accordance with a difference between the first and second side mode suppression ratios.
4 more elements
A computer program product for implementing a method for testing a laser, the computer program product comprising:
- a computer readable medium carrying computer executable instructions for performing the method, wherein the method comprises:
- causing operation of the laser at a first bias setting;
- measuring a first side mode suppression ratio of a laser output based on a first ratio of highest and next highest optical power peaks as a function of a first wavelength while operating the laser at the first bias setting;
- causing operation of the laser at a second bias setting;
- measuring a second side mode suppression ratio of a laser output based on a second ratio of highest and next highest optical power peaks as a function of a second wavelength while operating the laser at the second bias setting;
- correlating a difference between the first and second side mode suppression ratios with a measured bit error rate;
- and
- determining a value of an operational parameter for the laser based upon the correlation between the suppression ratio difference and measured bit error rate.
5 more elements
A system for testing a laser, comprising:
- a data source configured to transmit a data stream signal;
- an evaluation board configured to receive the data stream signal from the data source and to transmit the received data stream signal to the laser;
- a test device configured to measure optical output of the laser with respect to wavelength;
- and
- a computer coupled to the evaluation board and the test device, the computer including control software comprising one or more modules for testing the laser by:
- causing the evaluation board to operate the laser at a first bias setting;
- receiving, from the test device, information associated with operation of the laser at the first bias setting, and using the received information to determine a first side mode suppression ratio of the laser output based on a first ratio of highest to next highest optical power peaks as a function of a first wavelength;
- causing the evaluation board to operate the laser at a second bias setting;
- receiving, from the test device, information associated with operation of the laser at the second bias setting, and using the received information associated with the second bias setting to determine a second side mode suppression ratio of the laser output based on a second ratio of highest to next highest optical power peaks as a function of a second wavelength;
- and
- generating a test result for the laser in accordance with a difference between the first and second side mode suppression ratios.
8 more elements
Dependencies are inferred from the claim text.