Patent ID: 8867579
Filing Date: 2014-10-21
Classification: H01S

Abstract:
1. A laser device comprising: a laser including at least one Distributed Bragg Reflector (DBR) section, at least one phase section, and at least one gain section; a laser control means configured to feed respective tuning currents to the at least one DBR section, to the at least one phase section, and to the at least one gain section in order to tune the laser; a feedback control means; a frequency noise discriminator in communication with the feedback control means, configured to detect a frequency fluctuation in a light beam output from the laser and to communicate a signal representing the frequency fluctuation to the feedback control means, the feedback control means being configured to feed a respective variable electric feedback signal to at least one of the at least one DBR section and the at least one phase section of the laser, so that an output laser frequency is altered in response to a variation in the feedback signal or the combination of respective feedback signals, the feedback signal or the combination of respective feedback signals being varied as a function of the detected frequency fluctuation so as to counteract the detected frequency fluctuation, the feedback control means being configured to receive a signal representing a presently-used Wavelength Division Multiplexed (WDM) channel and/or lasing frequency of the laser, and configured to vary the feedback signal or the combination of feedback signals so that each respective feedback signal amplitude and/or phase depends on the presently-used WDM channel and/or lasing frequency.