Method to tune emission wavelength of wavelength tunable laser apparatus and laser apparatus
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United States of America Patent
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Sep 4, 2018
Grant Date -
Feb 15, 2018
app pub date -
Oct 11, 2017
filing date -
Aug 21, 2014
priority date (Note) -
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Abstract
A method to tune an emission wavelength of a wavelength tunable laser apparatus is disclosed. The laser apparatus implements, in addition to a wavelength tunable laser diode (t-LD) integrating with a semiconductor optical amplifier (SOA), a wavelength monitor including an etalon filter. The current emission wavelength is determined by a ratio of the magnitude of a filtered beam passing the etalon filter to a raw beam not passing the etalon filter. The method first sets the SOA in an absorbing mode to sense stray component disturbing the wavelength monitor, then correct the ratio of the beams by subtracting the contribution from the stray component.
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