US 12,470,302 B2
Coherent optical receiver, and optical communication device and system
Tao Gui, Dongguan (CN); Xuefeng Wang, Wuhan (CN); and Juntao Cao, Shenzhen (CN)
Assigned to HUAWEI TECHNOLOGIES CO., LTD., Shenzhen (CN)
Filed by HUAWEI TECHNOLOGIES CO., LTD., Shenzhen (CN)
Filed on Jun. 12, 2023, as Appl. No. 18/332,894.
Application 18/332,894 is a continuation of application No. PCT/CN2021/139614, filed on Dec. 20, 2021.
Claims priority of application No. 202011602198.2 (CN), filed on Dec. 30, 2020.
Prior Publication US 2023/0344523 A1, Oct. 26, 2023
Int. Cl. H04B 10/61 (2013.01)
CPC H04B 10/615 (2013.01) [H04B 10/6164 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A coherent optical receiver, comprising:
a first polarization beam splitting device, wherein the first polarization beam splitting device is configured to decompose received signal light into two channels of signal light;
a polarization control component, wherein the polarization control component comprises a half-wave plate device and a second polarization beam splitting device;
a frequency mixing component configured to mix the two channels of signal light output by the first polarization beam splitting device and the two channels of local oscillator light output by the polarization control component;
a photoelectric detection component configured to convert a mixed optical signal output by the frequency mixing component into an electrical signal; and
a feedback control circuit, wherein
the half-wave plate device is configured to, driven by a first voltage loaded by the feedback control circuit, deflect a state of polarization of received local oscillator light, wherein an azimuth of the half-wave plate device can rotate continuously under driving of a voltage within a target range of the voltage;
the second polarization beam splitting device is configured to decompose the received local oscillator light into two channels of local oscillator light,
and
the feedback control circuit is configured to adjust, after a difference between optical power of the two channels of local oscillator light output by the polarization control component is detected to be greater than a difference threshold, a voltage loaded to the half-wave plate device to a second voltage, so that the difference between the optical power is less than or equal to the difference threshold.