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OPTICAL TRANSMITTER

  • US 20200136349A1
  • Filed: 03/31/2017
  • Published: 04/30/2020
  • Est. Priority Date: 03/31/2017
  • Status: Active Grant
First Claim
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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.

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