LASER APPARATUS AND METHOD TO RE-TUNE EMISSION WAVELENGTH OF WAVELENGTH TUNABLE LD

摘要

A laser apparatus for tuning the emission wavelength of a wavelength tunable laser diode will be described. The apparatus includes a tunable LD with heaters to tune the emission wavelength of the tunable LD, and a controller to control the power supplied to the heaters. A feature of the laser apparatus is that the controller supplies pre-emphasis power to the heaters before the supplement of the power corresponding to the re-tuned emission wavelength to accelerate the stability of the temperature of the heaters.

主权项

1. A laser apparatus, comprising
a wavelength tunable laser diode (t-LD) providing a heater; and a controller to control power supplied to the heater to re-tune an emission wavelength of the t-LD by changing the power from first power Pa to second power Pb, wherein the controller supplies pre-emphasis power Pp before supplying the second power Pb, the pre-emphasis power Pp being greater than the second power Pb when the second power Pb is greater than the first power Pa, and supplies the pre-emphasis power Pp smaller than the second power Pb when the second power Pb is smaller than the first power Pa.