OPTICAL TRANSMITTER
First Claim
1. An optical transmitter comprising:
- a semiconductor laser unit to output laser light of first output power corresponding to an input laser driving current and to output a monitor current corresponding to the first output power;
a casing of an optical module to include the semiconductor laser unit and to hold an optical fiber having an end disposed at a position on which the laser light hits;
a monitor current detection unit to generate a monitor voltage corresponding to the monitor current;
a laser driving unit to control the laser driving current to make the monitor voltage approaches a set target voltage;
a storage unit to store previously information based on a result of a measurement of a ratio of second output power of the laser light output through the optical fiber with respect to the first output power of the semiconductor laser unit at each of a plurality of temperatures;
a temperature sensor to detect an ambient temperature of the semiconductor laser unit;
a target voltage determination unit to change the target voltage using a detected temperature detected by the temperature sensor and the information based on the result of the measurement; and
a power monitor value determination unit to generate a power monitor value indicating the second output power to be transmitted to a host device, using the detected temperature and the information based on the result of the measurement.
1 Assignment
0 Petitions
Accused Products
Abstract
An optical transmitter includes: a semiconductor laser unit that outputs laser light of first output power and outputs a monitor current; a casing of an optical module that holds optical fiber; a monitor current detection unit that generates a monitor voltage; a laser driving unit that controls a laser driving current; a storage unit that stores information based on a result of a measurement of a ratio of second output power with respect to the first output power; a target voltage determination unit that changes the target voltage based on a detected temperature of a temperature sensor and the information based on the result of the measurement; and a power monitor value determination unit that generates a power monitor value indicating the second output power to be transmitted to a host device using the detected temperature and the information based on the result of the measurement.
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Citations
4 Claims
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1. An optical transmitter comprising:
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a semiconductor laser unit to output laser light of first output power corresponding to an input laser driving current and to output a monitor current corresponding to the first output power; a casing of an optical module to include the semiconductor laser unit and to hold an optical fiber having an end disposed at a position on which the laser light hits; a monitor current detection unit to generate a monitor voltage corresponding to the monitor current; a laser driving unit to control the laser driving current to make the monitor voltage approaches a set target voltage; a storage unit to store previously information based on a result of a measurement of a ratio of second output power of the laser light output through the optical fiber with respect to the first output power of the semiconductor laser unit at each of a plurality of temperatures; a temperature sensor to detect an ambient temperature of the semiconductor laser unit; a target voltage determination unit to change the target voltage using a detected temperature detected by the temperature sensor and the information based on the result of the measurement; and a power monitor value determination unit to generate a power monitor value indicating the second output power to be transmitted to a host device, using the detected temperature and the information based on the result of the measurement. - View Dependent Claims (2, 3, 4)
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Specification