US 11,901,696 B2
Wavelength drift suppression for burst-mode tunable EML laser
Tao Zhang, Mountain View, CA (US); Cedric Fung Lam, San Carlos, CA (US); Shuang Yin, Sunnyvale, CA (US); Xiangjun Zhao, Fremont, CA (US); Liang Du, Santa Clara, CA (US); Changhong Joy Jiang, Dublin, CA (US); Adam Edwin Taylor Barratt, Portland, OR (US); Claudio Desanti, Mountain View, CA (US); and Muthu Nagarajan, Santa Clara, CA (US)
Assigned to Google LLC, Mountain View, CA (US)
Appl. No. 17/057,645
Filed by Google LLC, Mountain View, CA (US)
PCT Filed May 7, 2019, PCT No. PCT/US2019/031051
§ 371(c)(1), (2) Date Nov. 21, 2020,
PCT Pub. No. WO2019/226333, PCT Pub. Date Nov. 28, 2019.
Claims priority of provisional application 62/674,447, filed on May 21, 2018.
Prior Publication US 2021/0151952 A1, May 20, 2021
Int. Cl. H01S 5/024 (2006.01); H01S 5/026 (2006.01); H01S 5/042 (2006.01); H01S 5/0625 (2006.01); H04B 10/50 (2013.01); H04B 10/54 (2013.01); H04B 10/564 (2013.01); H04B 10/27 (2013.01)
CPC H01S 5/0428 (2013.01) [H01S 5/0265 (2013.01); H01S 5/06255 (2013.01); H04B 10/504 (2013.01); H04B 10/541 (2013.01); H04B 10/564 (2013.01); H01S 5/02453 (2013.01); H04B 10/27 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method comprising:
receiving, at a laser driving circuit, a burst mode signal indicative of a burst-on state or a burst-off state;
when the burst mode signal is indicative of the burst-on state:
delivering, by the laser driving circuit, a first bias current to an anode of a gain-section diode disposed on a shared substrate of a tunable laser, the tunable laser comprising an Electro-absorption Modulated tunable laser; and
delivering, by the laser driving circuit, a second bias current to an anode of a phase-section diode disposed on the shared substrate of the tunable laser, wherein the second bias current is less than the first bias current; and
when the burst mode signal transitions to be indicative of the burst-off state from the burst-on state:
delivering, by the laser driving circuit, the first bias current to the anode of the gain-section diode; and
delivering, by the laser driving circuit, the second bias current to the anode of the phase-section diode, wherein the first bias current is less than the second bias current,
wherein:
the first bias current is equal to a tail current minus the second bias current; and
the second bias current is equal to the tail current minus the first bias current.