US 12,352,901 B2
Optical device testing system
Suning Xie, San Jose, CA (US); Abhinav Rohit, Fremont, CA (US); Lucas Morales, San Francisco, CA (US); Mikhail Dolganov, Gilroy, CA (US); and Peter Tran, San Jose, CA (US)
Assigned to Lumentum Operations LLC, San Jose, CA (US)
Filed by Lumentum Operations LLC, San Jose, CA (US)
Filed on May 28, 2021, as Appl. No. 17/303,421.
Claims priority of provisional application 63/159,206, filed on Mar. 10, 2021.
Prior Publication US 2022/0291341 A1, Sep. 15, 2022
Int. Cl. H01S 5/042 (2006.01); G01S 7/484 (2006.01); G01S 7/486 (2020.01); G01S 17/894 (2020.01); H01S 5/00 (2006.01); H01S 5/183 (2006.01)
CPC G01S 7/484 (2013.01) [G01S 7/486 (2013.01); G01S 17/894 (2020.01); H01S 5/0428 (2013.01); H01S 5/183 (2013.01); H01S 5/0014 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A characterization circuit for an optical device, comprising:
the optical device;
a switch;
a switch driver;
one or more resistors; and
one or more capacitors, wherein:
the switch driver is configured to receive, via a first card edge connector trace, a trigger pulse from an external pulse generator and to provide the trigger pulse to the switch,
wherein a pulse width of the trigger pulse is greater than or equal to a first threshold;
the switch is configured to receive the trigger pulse from the external pulse generator and to be in an on state when receiving the trigger pulse;
the switch is configured to be in an off state when not receiving the trigger pulse;
the one or more capacitors are configured to, when the switch is in the off state, receive, via a second card edge connector trace, a charge current from an external driver voltage source via the one or more resistors,
wherein a rise time of the charge current is greater than a second threshold;
the one or more capacitors are configured to, when the switch is in the on state, discharge a current pulse to the optical device,
wherein a pulse width of the current pulse is less than a third threshold,
wherein an average current associated with a flow of the charge current through the one or more resistors from the external driver voltage source to the one or more capacitors matches an average current associated with the flow of the current pulse through the optical device; and
the optical device is configured to receive the current pulse from the one or more capacitors and to emit, based on a flow of the current pulse through the optical device, an optical output pulse.