Patent ID: 11956341
Assignee: APPLE INC.
Field: Telecommunications (Electrical engineering)
Classification: CPC H | IPC H

Claim 10:
11. A method of operating an electro-optical phase-locked loop comprising:
emitting, using a first laser, emitting a first optical local oscillator (LO) signal at a first frequency;
emitting, using a second laser, a second optical LO signal at a second frequency that is offset from the first frequency by an offset frequency greater than 50 GHz;
coarsely tuning, using a frequency-locked loop (FLL) path communicably coupled between an output of the second laser and an input of the second laser, the second optical LO signal emitted by the second laser until the second frequency is locked; and
once the second frequency is locked, finely tuning, using a phase-locked loop (PLL) path communicably coupled between the output of the second laser and the input of the second laser, the second optical LO signal emitted by the second laser until the second optical LO signal is phase-locked with the first optical LO signal.