US 11,942,997 B2
Fast scan method and apparatus for beacon auto-tune
Paul N. Freeman, Saratoga, CA (US); Paul Gavrilovic, Allen, TX (US); and Steven Joseph Hand, Los Gatos, CA (US)
Assigned to Infinera Corporation, San Jose, CA (US)
Filed by Infinera Corporation, San Jose, CA (US)
Filed on Jul. 22, 2021, as Appl. No. 17/383,395.
Claims priority of provisional application 63/055,314, filed on Jul. 22, 2020.
Prior Publication US 2022/0029709 A1, Jan. 27, 2022
Int. Cl. H04B 10/00 (2013.01); H01S 5/026 (2006.01); H01S 5/06 (2006.01); H01S 5/068 (2006.01); H01S 5/12 (2021.01); H04B 10/61 (2013.01); H04J 14/00 (2006.01)
CPC H04B 10/6164 (2013.01) [H01S 5/026 (2013.01); H01S 5/0612 (2013.01); H01S 5/068 (2013.01); H01S 5/1234 (2013.01)] 28 Claims
OG exemplary drawing
 
1. A method of tuning a local oscillator laser in a coherent receiver, wherein the 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, the method comprising the steps of:
selecting a first range of frequencies;
selecting a first subrange of frequencies in the first range of frequencies;
changing a first power supplied to the third heater to thereby adjust a frequency of the local oscillator laser from a first frequency to a second frequency in a first plurality of successive frequency increments, the first and second frequencies being within the first subrange of frequencies;
changing a second power supplied to the first heater and a third power supplied to the second heater to thereby adjust the frequency of the local oscillator laser from the second frequency to a third frequency;
changing the first power to thereby adjust the frequency of the local oscillator laser from the third frequency to a fourth frequency in a second plurality of successive frequency increments, the third and fourth frequencies being within a second subrange of frequencies that is in the first range of frequencies;
selecting a second range of frequencies;
changing the second power and the third power to thereby adjust the frequency of the local oscillator laser from the fourth frequency to a fifth frequency;
changing the first power to thereby adjust the frequency of the local oscillator laser from the fifth frequency to a sixth frequency in a third plurality of successive frequency increments, the fifth and sixth frequencies being within a third subrange of frequencies that is within the second range of frequencies, wherein the coherent receiver is operable to detect data carried by a received optical signal when the local oscillator laser has the sixth frequency.