US 12,072,239 B1
Circuits and methods for wavelength locking of optical receiver WDM filters
Zhaowen Wang, Sunnyvale, CA (US); Mayank Raj, San Jose, CA (US); Chuan Xie, Fremont, CA (US); Sandeep Kumar, Cork (IE); Muqseed Mohammad, Singapore (SG); Sukruth Pattanagiri Giriyappa, Singapore (SG); Stanley Y. Chen, Cupertino, CA (US); Parag Upadhyaya, Los Gatos, CA (US); and Yohan Frans, Palo Alto, CA (US)
Assigned to XILINX, INC., San Jose, CA (US)
Filed by XILINX, INC., San Jose, CA (US)
Filed on Mar. 30, 2023, as Appl. No. 18/128,948.
Int. Cl. G01J 1/44 (2006.01); G01J 1/02 (2006.01); H03F 3/45 (2006.01)
CPC G01J 1/44 (2013.01) [G01J 1/0252 (2013.01); H03F 3/45076 (2013.01); G01J 2001/444 (2013.01); G01J 2001/446 (2013.01)] 19 Claims
OG exemplary drawing
 
1. An integrated circuit (IC) device comprising:
a controller circuitry having an input coupled to a photodiode of an optoelectronic circuitry and an output coupled to a heater of the optoelectronic circuitry, wherein:
the controller circuitry is configured to determine a center frequency of the optoelectronic circuitry based on a shape of an input signal received from the photodiode, and provide a heater signal to the heater based on the shape of the input signal and the center frequency of the optoelectronic circuitry; and
the controller circuitry comprises a control code circuitry configured to calibrate the heater signal to maintain the center frequency of the optoelectronic circuitry to a frequency of the input signal by maintaining a transimpedance (TIA) control signal code, generated by the control code circuitry, within a calibration threshold.