US 12,283,293 B2
Measuring laser diode temperature and predicting mode hops using laser diode resistance
Sukumar Rajauria, San Jose, CA (US); Erhard Schreck, San Jose, CA (US); and Dongying Li, San Jose, CA (US)
Assigned to Western Digital Technologies, Inc., San Jose, CA (US)
Filed by Western Digital Technologies, Inc., San Jose, CA (US)
Filed on Aug. 10, 2023, as Appl. No. 18/447,517.
Claims priority of provisional application 63/510,382, filed on Jun. 27, 2023.
Prior Publication US 2025/0006220 A1, Jan. 2, 2025
Int. Cl. G11B 5/00 (2006.01); G01K 7/16 (2006.01); G11B 5/02 (2006.01)
CPC G11B 5/02 (2013.01) [G01K 7/16 (2013.01); G11B 2005/0021 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A data storage device, comprising:
a disk;
an actuator arm assembly comprising a magnetic recording head;
a laser diode; and
one or more processing devices configured to:
initiate a write operation, wherein the write operation is associated with a first temperature of the laser diode;
determine self-heating induced by the laser diode for one or more of a transient condition and a steady-state condition of the laser diode, wherein determining the self-heating induced by the laser diode comprises measuring a resistance of the laser diode, and wherein the resistance corresponds to a temperature of the laser diode;
detect, based at least in part on measuring the resistance, a change in the temperature of the laser diode relative to the first temperature; and
in response to detecting the change, adjust the temperature of the laser diode during the write operation.