CPC G02F 2/02 (2013.01) [H01S 3/067 (2013.01); H04B 2210/006 (2013.01)] | 20 Claims |
1. An optical frequency control device, comprising:
a detection circuit to receive first light including a first frequency from a first light source, receive second light including a second frequency from a second light source, modulate the first light with a local oscillation signal oscillated by a first local oscillation signal source, and detect a differential beat signal including a differential frequency between a frequency of sideband light included in the first light, which is modulated, and the second frequency;
a light source control circuit to change the second frequency included in the second light oscillated by the second light source by frequency-dividing a differential beat signal detected by the detection circuit with a first frequency division number, by frequency-dividing a reference signal oscillated by a reference signal source with a second frequency division number, and by outputting, to the second light source, a phase error signal, which indicates a phase difference between the differential beat signal after the frequency division and the reference signal after the frequency division number; and
a signal processor to set each of a first frequency division number and a second frequency division number in accordance with a set value of a frequency difference between the first frequency division number and the second frequency division number.
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