Apparatus, method, and computer program product for controlling laser wavelength stability

摘要

An apparatus includes a laser that generates a predetermined wavelength when the laser operates at room temperature, the predetermined wavelength being offset from a specific wavelength. The laser has a controlled wavelength range due to a wavelength drift, the wavelength range having a first wavelength as the upper boundary and a second wavelength as the lower boundary, the first wavelength is generated when the laser operates at a first temperature of an ambient and the second wavelength is generated when the laser operates at a predetermined temperature higher than a second temperature of the ambient. The apparatus includes a heater that heats the laser such that a wavelength in the controlled wavelength range that is generated by the laser when heated by the heater from the second temperature is longer than a short wavelength that is generated by the laser centered on the specific wavelength that operates at the second temperature; and a control circuit configured to turn on the heater.

主权项

1. An optical transmitter apparatus comprising:
a heater; and a laser configured to have a center ambient wavelength offset from a center ambient wavelength of an operative band of the transmitter, and; a controller to operate the heater when an ambient temperature of the laser approaches, reaches, or exceeds a shifted lower temperature working range of the laser, where the shifted lower temperature range is set higher than a lower temperature range of a laser have a center ambient wavelength that is not offset from the center ambient wavelength of an operative band of the transmitter.