US 12,244,347 B2
Optical transmission module, optical data link, and optical transmission system
Satoru Kurokawa, Ibaraki (JP)
Assigned to 7GAA CO., LTD., Ibaraki (JP)
Appl. No. 18/006,608
Filed by 7GAA CO., LTD., Ibaraki (JP)
PCT Filed Aug. 20, 2021, PCT No. PCT/JP2021/030637
§ 371(c)(1), (2) Date Jan. 24, 2023,
PCT Pub. No. WO2022/045015, PCT Pub. Date Mar. 3, 2022.
Claims priority of application No. 2020-142910 (JP), filed on Aug. 26, 2020.
Prior Publication US 2023/0268997 A1, Aug. 24, 2023
Int. Cl. H04B 10/00 (2013.01); H01P 5/18 (2006.01); H01Q 9/04 (2006.01); H04B 10/25 (2013.01); H04B 10/40 (2013.01)
CPC H04B 10/40 (2013.01) [H01P 5/184 (2013.01); H01Q 9/045 (2013.01); H04B 10/2589 (2020.05)] 19 Claims
OG exemplary drawing
 
1. An optical transmission module comprising:
a first line, one end of which is connected to a high-frequency signal input unit and the other end of which is connected to a termination unit;
a second line, one end of which is connected to an electrical-optical conversion unit that converts an electrical signal input from the high-frequency signal input unit into an optical signal and outputs the optical signal and the other end of which is connected to a power supply connection unit that is connected to a DC power supply and applies a voltage to drive the electrical-optical conversion unit; and
a coupling portion at which the first line and the second line are electromagnetically coupled to each other via a predetermined space with a predetermined electrical length with respect to a wavelength of a frequency used, wherein
in a frequency band range in which an attenuation of coupling characteristics between the first line and the second line is lower than an attenuation of isolation characteristics between the first line and the second line,
the electrical-optical conversion unit is connected to an end of the second line in the same direction as a propagation direction of a traveling wave of a high-frequency signal input from the high-frequency signal input unit to the first line, and the power supply connection unit is connected to the other end of the second line, and
in a frequency band range in which the attenuation of the coupling characteristics between the first line and the second line is higher than the attenuation of the isolation characteristics between the first line and the second line, the electrical-optical conversion unit is connected to an end of the second line in a direction opposite to a propagation direction of a traveling wave of a high-frequency signal input from the high-frequency signal input unit to the first line, and the power supply connection unit is connected to the other end of the second line.