US 12,438,340 B2
Ultra small packaged tunable laser assembly
Zhigang Zhou, San Jose, CA (US); Kevin Boyd, San Jose, CA (US); Guang-Hua Duan, San Jose, CA (US); Min Huang, San Jose, CA (US); Zhenming Xie, San Jose, CA (US); Rihao Li, San Jose, CA (US); Qiang Liu, San Jose, CA (US); Huixian Wen, San Jose, CA (US); and Jianguo Wang, San Jose, CA (US)
Assigned to O-Net Communications, Inc., San Jose, CA (US)
Filed by Zhigang Zhou, San Jose, CA (US); Kevin Boyd, San Jose, CA (US); Guang-Hua Duan, San Jose, CA (US); Min Huang, San Jose, CA (US); Zhenming Xie, San Jose, CA (US); Rihao Li, San Jose, CA (US); Qiang Liu, San Jose, CA (US); Huixian Wen, San Jose, CA (US); and Jianguo Wang, San Jose, CA (US)
Filed on Nov. 15, 2022, as Appl. No. 17/987,821.
Prior Publication US 2024/0162682 A1, May 16, 2024
Int. Cl. H01S 5/14 (2006.01); H01S 5/06 (2006.01); H01S 5/0683 (2006.01)
CPC H01S 5/141 (2013.01) [H01S 5/0612 (2013.01); H01S 5/06837 (2013.01); H01S 2301/03 (2013.01)] 17 Claims
OG exemplary drawing
 
1. An external cavity tunable laser, comprising:
a gain medium module to generate a broadband optical spectrum covering a predetermined wavelength range, the gain medium module comprising a gain medium chip with a gain medium waveguide;
one or more heaters with one heater proximal the gain medium waveguide;
electrical connections to apply a dither signal to the heater for wavelength locking;
a collimating lens turning a diverging beam into a collimated beam;
a pair of etalons to tune frequency;
an actuator to adjust an external cavity optical path length;
a bandpass filter to block one or more frequencies outside the predetermined wavelength range;
a beam splitter to split a percentage of the collimated beam to a photodetector;
a reflection mirror for feedback to the gain medium waveguide;
an isolator for preventing reflecting light back to the external cavity; and
a hermetically sealed housing less than 0.15 cubic centimeters.