Patent ID: 11942997
Assignee: INFINERA CORPORATION
Field: Telecommunications (Electrical engineering)
Classification: CPC H | IPC H

Claim 22:
23. A coherent receiver, comprising:
a local oscillator laser, wherein the local oscillator laser includes a first grating, a second grating, a phase section, a first heater adjacent the first grating, a second heater adjacent the second grating, and a third heater adjacent the phase section; and
a control circuit operable to:
select a first tuning range among a plurality of tuning ranges, the first tuning range being defined by a lowest frequency and a highest frequency;
increase a frequency of light output from the local oscillator laser from a first frequency within the first tuning range to a second frequency within the first tuning range by changing a first power supplied to the first heater and changing a second power supplied to the second heater;
select a second tuning range among the plurality of tuning ranges, the second tuning range having a lowest second frequency and a highest second frequency;
decrease the frequency of the light output from the local oscillator laser from a third frequency within the second tuning range to a fourth frequency within the second tuning range by changing the first power and the second power;
adjust the frequency of the light output from the local oscillator laser from the fourth frequency to a fifth frequency by changing a third power supplied to the third heater.