US 11,835,844 B2
Optical frequency control device, optical oscillation device, frequency conversion device, and radio wave generation device
Junya Nishioka, Tokyo (JP); Tomohiro Akiyama, Tokyo (JP); Yuta Takemoto, Tokyo (JP); and Toshiyuki Ando, Tokyo (JP)
Assigned to Mitsubishi Electric Corporation, Tokyo (JP)
Filed by Mitsubishi Electric Corporation, Tokyo (JP)
Filed on Apr. 4, 2022, as Appl. No. 17/712,667.
Application 17/712,667 is a continuation of application No. PCT/JP2020/043013, filed on Nov. 18, 2020.
Claims priority of application No. PCT/JP2019/045159 (WO), filed on Nov. 19, 2019.
Prior Publication US 2022/0244617 A1, Aug. 4, 2022
Int. Cl. G02F 2/02 (2006.01); H01S 3/067 (2006.01)
CPC G02F 2/02 (2013.01) [H01S 3/067 (2013.01); H04B 2210/006 (2013.01)] 20 Claims
OG exemplary drawing
 
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.