US 11,942,998 B2
Optical reception device, station-side device, PON system, preamplifier, optical reception method, and method for suppressing output inversion of integrator
Naruto Tanaka, Osaka (JP)
Assigned to SUMITOMO ELECTRIC INDUSTRIES, LTD., Osaka (JP)
Appl. No. 17/607,297
Filed by SUMITOMO ELECTRIC INDUSTRIES, LTD., Osaka (JP)
PCT Filed Jun. 8, 2020, PCT No. PCT/JP2020/022495
§ 371(c)(1), (2) Date Oct. 28, 2021,
PCT Pub. No. WO2020/250846, PCT Pub. Date Dec. 17, 2020.
Claims priority of application No. 2019-110446 (JP), filed on Jun. 13, 2019.
Prior Publication US 2022/0190932 A1, Jun. 16, 2022
Int. Cl. H04B 10/69 (2013.01); H03F 3/08 (2006.01); H04B 10/272 (2013.01)
CPC H04B 10/69 (2013.01) [H03F 3/08 (2013.01); H04B 10/693 (2013.01); H04B 10/272 (2013.01)] 21 Claims
OG exemplary drawing
 
20. An optical reception method for receiving an optical signal in a burst state, the optical reception method comprising, in a stage of preamplification:
receiving and amplifying, by an amplifier, a current based on an input current from a light receiving element configured to receive the optical signal;
removing an offset current included in the input current and releasing a part of the input current, on the basis of an output of the amplifier and a reference voltage; and
integrating, by an integrator, the output of the amplifier and outputting a resultant output to two electric paths of a positive phase and a negative phase, and when a negative phase potential of the output to the two electric paths is higher than a positive phase potential thereof, injecting a current to the positive phase and extracting a current from the negative phase.