US 12,436,339 B2
Optical transceiver, optical transceiver device using the same, and method of controlling light source wavelengths
Jun Matsui, Kawasaki (JP); Tomoyuki Akiyama, Yokohama (JP); and Shinsuke Tanaka, Hiratsuka (JP)
Assigned to Fujitsu Limited, Kawasaki (JP)
Filed by Fujitsu Limited, Kawasaki (JP)
Filed on Jul. 21, 2023, as Appl. No. 18/224,654.
Claims priority of application No. 2022-149338 (JP), filed on Sep. 20, 2022.
Prior Publication US 2024/0094470 A1, Mar. 21, 2024
Int. Cl. G02B 6/293 (2006.01); H04B 10/40 (2013.01); H04B 10/50 (2013.01); H04B 10/572 (2013.01); H04J 14/02 (2006.01)
CPC G02B 6/2935 (2013.01) [H04B 10/40 (2013.01); H04B 10/501 (2013.01); H04B 10/5057 (2013.01); H04B 10/506 (2013.01); H04B 10/572 (2013.01); H04J 14/0307 (2023.08)] 13 Claims
OG exemplary drawing
 
9. A method of controlling light source wavelengths, the method comprising:
preparing a light source device having a plurality of light source elements having different wavelengths;
having light including a plurality of wavelengths from the light source device incident on a demultiplexer, the demultiplexer to supply the plurality of wavelengths to an optical transceiver circuit, the demultiplexer including a plurality of unit circuits cascaded in a tree shape, each of the unit circuits including three asymmetric Mach-Zehnder interferometers having a predetermined arm length difference connected in a tree shape;
monitoring light rays of the plurality of wavelengths demultiplexed by the demultiplexer at output ports of the demultiplexer; and
controlling the wavelengths of the plurality of light source elements by a wavelength controller, based on monitoring results.